Nano Energy最新文献_第5页

Engineering d-band center of MnO2 to promote semi-ionic C-F bonding for high-rate Li-CFx batteries 促进高倍率锂cfx电池半离子C-F键合的MnO2工程d波段中心

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-21 DOI: 10.1016/j.nanoen.2026.111725

Mengyao Li , Xifei Li , Jun Li , Ruixian Duan , Xuexia Song , Guiqiang Cao , Junqian Liu , Jingjing Wang , Wenbin Li

Lithium/carbon fluoride (Li/CF_x) primary batteries suffer from severe voltage hysteresis and rapid capacity degradation at high current densities, presenting significant challenges for achieving superior rate performance. This work proposes a modification strategy for fabricating an amorphous MnO₂-anchored CF composite cathode via rapid in-situ reduction. The amorphous MnO₂ provides abundant active sites and diffusion channels on the CF substrate surface, thereby improving the utilization efficiency of the conversion reaction. Compared with CF and c-MnO₂@CF, a-MnO₂@CF-2 exhibits enhanced electrical conductivity, effectively mitigating voltage hysteresis and delivering superior electrochemical performance under high-rate discharge conditions. Experimental results demonstrate that a-MnO₂@CF-2 achieves a maximum energy density of 2.05 × 10³ Wh kg⁻¹ at 0.1 C. Compared with pristine CF, the discharge rate performance improves from 2 C to 15 C, while the power density increases from 3.11 kW kg⁻¹ to 27.9 kW kg⁻¹. Ex situ XPS and XRD analyses reveal an “in situ electrochemical activation” mechanism: a-MnO₂ preferentially undergoes lithiation at 2.5 V to form highly conductive Li_XMnO₂ networks, which reduce interfacial resistance and activate CF discharge at elevated potentials (>2.5 V). DRT analysis reveals that the abundant surface defects of amorphous MnO₂ facilitate the Li⁺ transport pathways. Additionally, theoretical calculations reveal that, compared with c-MnO₂@CF, the d orbital of Mn in a-MnO₂@CF is closer to the Fermi level. This shift leads to greater electron transfer from MnO₂, to CF, and consequently reduces the overlap between C and F p-orbitals in the CF component of the composite. This reduction in orbital overlap weakens C-F p-p orbital hybridization, thereby enhancing the semi-ionic character of the C-F bonds. This work demonstrates a highly feasible chemical modification strategy for constructing composite cathodes, enabling significant performance improvements in Li/CF_X primary batteries.

锂/氟化碳（Li/CFx）原电池在高电流密度下存在严重的电压滞后和快速的容量退化，这对实现卓越的倍率性能提出了重大挑战。本工作提出了一种通过快速原位还原制备无定形二氧化锰锚定CF复合阴极的改性策略。无定形二氧化锰在CF衬底表面提供了丰富的活性位点和扩散通道，从而提高了转化反应的利用效率。与CF和c-MnO2@CF相比，a-MnO2@CF-2在高倍率放电条件下表现出更强的导电性，有效地减轻了电压滞后，并提供了更好的电化学性能。实验结果表明，在0.1 ℃下，a-MnO2@CF-2的最大能量密度为2.05 × 103 Wh kg−1。与原始CF相比，放电倍率性能从2 C提高到15 C，功率密度从3.11 kW kg−1提高到27.9 kW kg−1。非原位XPS和XRD分析揭示了一种“原位电化学活化”机制：a-MnO2在2.5 V下优先发生锂化，形成高导电性LiXMnO2网络，降低界面电阻，激活CF在高电位（>2.5 V）下放电。DRT分析表明，无定形二氧化锰丰富的表面缺陷有利于Li+的输运途径。此外，理论计算表明，与c-MnO2@CF相比，a-MnO2@CF中Mn的d轨道更接近费米能级。这种转移导致更多的电子从MnO2转移到CF，从而减少了复合材料中CF组分中C和F轨道之间的重叠。这种轨道重叠的减少减弱了C-F - p-p轨道杂化，从而增强了C-F键的半离子特性。这项工作展示了一种高度可行的化学改性策略，用于构建复合阴极，使Li/CFX一次电池的性能得到显著提高。

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引用次数: 0

Delayed luminescence in sub-5 μm InGaN/GaN fin-LEDs with efficiency enhancement by UV-induced moisture adsorption uv诱导吸湿法提高Sub-5 μm InGaN/GaN翅片led延迟发光效率

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-20 DOI: 10.1016/j.nanoen.2026.111746

SeungJe Lee , Sangwon Nam , Jin Il Jang , Yuna Kwon , Huiyeong Kang , Yong Jae Lee , Keyong Nam Lee , Gang Yeol Yoo , Changwook Kim , Hyun Min Cho , Hyung Min Kim , Heesun Yang , Jae Kyu Song , Young Rag Do

High costs and efficiency degradation from surface defects in small-chip top-down fabrication impede micro-light-emitting diodes commercialization. To address this, we introduce Ultraviolet-irradiated moisture adsorption as a novel top-down approach, integrated with defect-reducing etching, to enhance ultra-small micro-light-emitting diodes. Ultraviolet-irradiated moisture adsorption is crucial: it effectively reduces surface strain caused by dangling and oxidized bonds through moisture adsorption, thereby facilitating significant delayed luminescence via detrapping from shallow trap states. This mechanism profoundly improves the internal quantum efficiency of ultra- micro-light-emitting diodes and the external quantum efficiency of light-emitting diode devices. Our approach, including defect-removal and strain-alleviation, yielded highly promising results for sub-5 μm fin- light-emitting diodes, achieving an internal quantum efficiency of 70.9 % and an external quantum efficiency of 16.5 %. By actively leveraging delayed luminescence through Ultraviolet-irradiated moisture adsorption, these methods offer a cost-effective and highly efficient solution, holding great potential for future micro-light-emitting diodes display commercialization.

小芯片自顶向下制造过程中由于表面缺陷导致的高成本和效率下降阻碍了微发光二极管的商业化。为了解决这个问题，我们引入了一种新的自顶向下的紫外辐射吸湿方法，结合减少缺陷的蚀刻，来增强超小型微型发光二极管。紫外线辐照的湿气吸附是至关重要的：它通过湿气吸附有效地减少了悬垂键和氧化键引起的表面应变，从而通过从浅阱状态脱除来促进显著的延迟发光。该机制大大提高了超微发光二极管的内部量子效率和发光二极管器件的外部量子效率。我们的方法，包括缺陷去除和应变缓解，在亚5 μm鳍状发光二极管上取得了非常有希望的结果，实现了70.9 %的内部量子效率和16.5 %的外部量子效率。这些方法通过积极利用紫外线照射的湿吸附延迟发光，提供了一种经济高效的解决方案，在未来的微发光二极管显示商业化中具有很大的潜力。

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引用次数: 0

Redox chemistry of LiCoO2, LiNiO2, and LiNi1/3Mn1/3Co1/3O2 cathodes: Deduced via XPS, DFT+DMFT, and charge transfer multiplet simulations licoo2、LiNiO 2和LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 o2阴极的氧化还原化学：通过XPS、DFT+DMFT和电荷转移多重模拟推导

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-20 DOI: 10.1016/j.nanoen.2026.111747

Ruiwen Xie , Maximilian Mellin , Wolfram Jaegermann , Jan P. Hofmann , Frank M.F. de Groot , Hongbin Zhang

Understanding the evolution of the physicochemical bulk properties during the Li deintercalation process is critical for optimizing battery cathode materials. In this study, we combine X-ray photoelectron spectroscopy (XPS), density functional theory plus dynamical mean-field theory (DFT+DMFT), and charge transfer multiplet (CTM) model to investigate how hybridization between transition metal (TM) 3

d

and oxygen 2

p

orbitals evolves upon Li deintercalation. Based on the presented approach combining theoretical calculations and experimental studies of pristine and deintercalated cathodes, two key aspects of ion batteries are examined: i) the detailed electronic structure and involved changes with deintercalation associated with the charge compensation mechanism, and ii) the precise experimental analysis of XPS data which are dominated by charge transfer coupled to final-state effects affecting the satellite structure. As main result for the investigated Li–TM oxides, the results indicate that the electron transfer coupled to the Li

^{+}

-ion migration does not follow a rigid band model but is influenced by changes in TM 3

d

and O 2

p

states hybridization. This integrated approach suggests that 2

p

XPS satellite peak intensity of TM is sensitive to changes in redox chemistry, providing an indirect experimental descriptor of cathode redox behavior and guiding the design of more efficient battery materials.

了解锂离子脱嵌过程中物理化学体性质的演变对优化电池正极材料至关重要。在这项研究中，我们结合x射线光电子能谱（XPS）、密度泛函理论加动态平均场理论（DFT+DMFT）和电荷转移多重体（CTM）模型，研究了Li脱嵌过程中过渡金属（TM） 3d轨道和氧2p轨道之间的杂化是如何演变的。基于理论计算和实验研究相结合的方法，对离子电池的两个关键方面进行了研究：1)与电荷补偿机制相关的脱嵌阴极的详细电子结构和相关变化；2)对影响卫星结构的电荷转移耦合终态效应主导的XPS数据进行了精确的实验分析。Li - TM氧化物的主要研究结果表明，Li+-离子迁移的电子转移不遵循刚性带模型，而是受TM 3d和o2p杂化态变化的影响。这种综合方法表明，TM的2p XPS卫星峰强度对氧化还原化学变化敏感，为阴极氧化还原行为提供了间接的实验描述，并指导了更高效电池材料的设计。

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引用次数: 0

Discovery of a new phase transition and high-valent redox mechanism in Fe-substituted Na2Mn3O7 铁取代Na2Mn3O7新相变及高价氧化还原机制的发现

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-20 DOI: 10.1016/j.nanoen.2026.111737

Hugh Barrett Smith , Bachu Sravan Kumar , Anirudh Adavi , Willem Vanmoerkerke , Ming Lei , Tong Wu , Jorge Moncada , Hui Zhong , Jianming Bai , Adrian Hunt , Iradwikanari Waluyo , Eli Stavitski , Loza F. Tadesse , Iwnetim Iwnetu Abate

Sodium-ion batteries are a promising lower-cost alternative to lithium-ion batteries, but further improvements in electrochemical performance are required. One strategy to increase capacity is to enable reversible high-valent cationic and anionic redox in layered cathode materials; however, this is typically accompanied by structural degradation. Here, we elucidate the mechanism by which Fe-doped Na₂Mn₃O₇, featuring ordered transition metal-vacancies, achieves reversible high-valent redox. Using Mössbauer spectroscopy, soft X-ray absorption spectroscopy (XAS), and in-situ hard XAS, we demonstrate reversible high-valent cationic redox involving both Fe and Mn while in-situ Raman confirms the absence of local structural degradation associated with oxygen redox. Combining in-situ X-ray diffraction with theoretical calculations, we further identify a previously unreported global phase transition from the

P \overset{̅}{1}

to the

P 2_{1} / c

space group during electrochemical cycling and develop a physical model describing this structural evolution. These results provide insights for structurally stable layered sodium transition metal oxide cathodes with reversible high-valent redox.

钠离子电池是一种很有前途的低成本锂离子电池替代品，但电化学性能还需要进一步改进。提高容量的一种策略是在层状阴极材料中实现可逆的高价阳离子和阴离子氧化还原；然而，这通常伴随着结构退化。在这里，我们阐明了具有有序过渡金属空位的fe掺杂Na2Mn3O7实现可逆高价氧化还原的机制。利用Mössbauer光谱，软x射线吸收光谱（XAS）和原位硬XAS，我们证明了铁和锰的可逆高价阳离子氧化还原，而原位拉曼证实了不存在与氧氧化还原相关的局部结构降解。结合原位x射线衍射和理论计算，我们进一步确定了电化学循环过程中从P1′s到P21/c空间群的全局相变，并建立了描述这种结构演变的物理模型。这些结果为具有可逆高价氧化还原的结构稳定的层状过渡金属氧化物钠阴极提供了见解。

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引用次数: 0

Molecular engineering of weak intermolecular interactions for regulating solvation and interface in cyclic ether electrolytes enabling robust lithium metal batteries 调节循环醚电解质溶剂化和界面的弱分子间相互作用的分子工程，实现坚固的锂金属电池

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-20 DOI: 10.1016/j.nanoen.2026.111744

Qujiang Sun , Bowen Yang , Di Zhang , Zhaojin Li , Qiujun Wang , Fei Yuan , Ranran Li , Huilan Sun , Yeguo Zou , Yu Qiao , Bo Wang

Lithium metal anodes are pivotal for pursuing high-energy-density lithium-ion batteries, yet persistent challenges including dendrite-induced safety risks, incompatibility with conventional ester electrolytes, and poor low-temperature performance hinder their practical deployment. Herein, a solvation chemistry modulation strategy via weak intermolecular interactions in tetrahydrofuran (THF)-based electrolytes is proposed, employing a low-melting-point solvent 1, 1, 2, 2-tetrafluoroethyl-2, 2, 2-trifluoroethyl ether (TFTFE) as a diluent. We found that the weak intermolecular interactions (i.e., dipole-dipole interaction, anion-dipole interaction) can effectively weaken Li⁺-THF interaction within the solvation structure, facilitating Li⁺ desolvation kinetics and achieving 99.3 % Li plating/stripping Coulombic efficiency. The optimized electrolyte endows the 50 μm-Li || LiFePO₄ full cell to maintain stable cycling over 500 cycles with 115 mAh g⁻¹ at 5.0 C, while maintaining 95.7 % capacity retention over 100 cycles even at −20°C. This work highlights the significance of weak interactions in fine-tuning electrolyte properties, and also paving innovative approaches for developing compatible electrolytes towards low-temperature and fast-charging lithium metal batteries.

锂金属阳极是追求高能量密度锂离子电池的关键，但枝晶引发的安全风险、与传统酯电解质的不相容性以及低温性能差等持续存在的挑战阻碍了其实际应用。本文采用低熔点溶剂1,1,2,2 -四氟乙基- 2,2,2 -三氟乙醚（TFTFE）作为稀释剂，提出了一种基于四氢呋喃（THF）电解质中弱分子间相互作用的溶剂化化学调制策略。研究发现，弱分子间相互作用（即偶极子-偶极子相互作用、阴离子-偶极子相互作用）可以有效地减弱Li+-THF在溶剂化结构中的相互作用，促进Li+脱溶动力学，实现99.3%的Li电镀/剥离库仑效率。优化后的电解质可使50 μm-Li || LiFePO4全电池在5.0℃下以115 mAh g-1保持500次循环稳定，即使在-20℃下也能保持95.7%的容量保持。这项工作强调了弱相互作用在微调电解质特性中的重要性，也为开发低温快速充电锂金属电池的兼容电解质铺平了创新途径。

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引用次数: 0

Sequential kinetic control of in-situ polymerization enables a graded solid electrolyte interphase for ultra-stable separator-free solid-state lithium metal batteries 原位聚合的顺序动力学控制实现了超稳定无分离器固态锂金属电池的梯度固体电解质界面

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-20 DOI: 10.1016/j.nanoen.2026.111743

Meng Wang, Huangxuanyu Yang, Yewen Li, Zhaoyuan Ding, Ruiping Liu

Precise regulation of the solid electrolyte interphase (SEI) is paramount yet challenging for developing high-performance solid-state lithium-metal batteries. Herein, we report a stepwise, kinetically controlled in-situ polymerization strategy that decouples the construction of a mechanical scaffold from the formation of an ion-conducting network within a single, integrated process. This approach begins with rapid UV-curing to form a liquid crystal polymer scaffold, which effectively localizes electrolyte precursors at the electrode interface. This scaffold then guides a subsequent slow cationic polymerization. This spatiotemporal control over the reaction environment is key to forming a robust, inorganic-rich (LiF/Li₂CO₃) gradient SEI. The obtained separator-free semi-interpenetrating network electrolyte not only achieves desirable bulk properties, including high ionic conductivity (6.22 × 10⁻⁴ S cm⁻¹), a high Li⁺ transference number (0.81), and a wide electrochemical window (5.1 V vs. Li/Li⁺), but also, and more critically, achieves substantially improved interfacial stability compared to its thermally polymerized counterpart. The tailored interface enables ultra-stable lithium plating/stripping, evidenced by Li||Li symmetric cells cycling for over 2480 h under low polarization. Furthermore, LiFePO₄||Li full cells demonstrate outstanding cycling stability, retaining 97 % of their initial capacity after 340 cycles. This work establishes sequential, photopolymerization-driven kinetic control as a powerful paradigm for designing next-generation solid-state batteries with precisely engineered and highly stable interfaces.

固体电解质间相（SEI）的精确调控对于高性能固态锂金属电池的开发是至关重要的，但也是具有挑战性的。在此，我们报告了一种逐步的、动态控制的原位聚合策略，该策略将机械支架的构建与离子传导网络的形成在一个单一的、集成的过程中解耦。这种方法从快速紫外线固化开始，形成液晶聚合物支架，有效地将电解质前体定位在电极界面。然后，这个支架引导随后的缓慢阳离子聚合。这种对反应环境的时空控制是形成坚固的、无机丰富的（LiF/Li2CO3）梯度SEI的关键。所获得的无分离器半互穿网络电解质不仅具有理想的体积特性，包括高离子电导率（6.22 × 10⁻4 S cm⁻1），高Li+转移数（0.81）和宽电化学窗口（5.1 V vs. Li/Li+），而且更重要的是，与热聚合的电解质相比，界面稳定性大大提高。量身定制的界面实现了超稳定的锂电镀/剥离，证明了Li||Li对称电池在低极化下循环超过2480小时。此外，LiFePO4||Li充满电池表现出出色的循环稳定性，在340次循环后保持了97%的初始容量。这项工作建立了顺序的、光聚合驱动的动力学控制，作为设计具有精确设计和高度稳定界面的下一代固态电池的有力范例。

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引用次数: 0

High-sulfur-doped cathodes enable efficient chloride conversion in rechargeable Na-Cl2 batteries 高硫掺杂阴极使可充电Na-Cl2电池中的氯离子高效转化

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-20 DOI: 10.1016/j.nanoen.2026.111745

Yiming Sun , Guanzhong Ma , Zihui Liu , Xinru Wei , Chenyu Ma , Wenting Feng , Xinghao Zhang , Han Wang , Xiaowei Zhang , Peiqi Liu , Debin Kong , Linjie Zhi

Rechargeable metal-chlorine (Li/Na-Cl₂) batteries are regarded as promising contenders for novel energy storage devices due to their exceptionally high energy density and broad operating temperature range. However, their practical application is severely constrained by the slow conversion and insufficient supply of chlorine species during redox reactions, resulting in short cycle lifetimes when Na-Cl₂ batteries undergo repeated charge-discharge cycles at high specific capacities. To achieve Na-Cl₂ batteries with high cut-off capacity, we hereby report for the first time the introduction of dual heteroatoms N and S into graphene via rapid Joule heating thermal shock. By leveraging nitrogen's preferential deposition to alter graphene's local electronic effects, we synthesise highly S-doped graphene materials. This doping induces charge redistribution on the carbon surface. This enables the doped S to fully exhibit its high catalytic activity, achieving efficient conversion of Cl₂ to NaCl. Consequently, the secondary Na-Cl₂ battery utilising high S-rGO demonstrates significantly enhanced output capacity, achieving a discharge capacity of 3000 mAh g⁻¹ at 1.5 A g⁻¹. This study demonstrates the efficacy of heteroatom engineering in modulating C/Cl interactions and enhancing the performance of Li/Na-Cl₂ batteries.

可充电金属-氯（Li/Na-Cl2）电池因其超高的能量密度和较宽的工作温度范围而被认为是新型储能装置的有力竞争者。然而，由于Na-Cl2电池在高比容量下反复充放电循环，其实际应用受到氧化还原反应过程中转换缓慢和氯气供应不足的严重制约。为了实现具有高截止容量的Na-Cl2电池，我们在此首次报道通过快速焦耳加热热冲击将双杂原子N和S引入石墨烯。通过利用氮的优先沉积来改变石墨烯的局部电子效应，我们合成了高s掺杂的石墨烯材料。这种掺杂引起碳表面的电荷重新分布。这使得掺杂的S充分发挥了其高催化活性，实现了Cl2到NaCl的高效转化。因此，利用高S-rGO的二次Na-Cl2电池显示出显着增强的输出容量，在1.5 a g−1下实现3000 mAh g−1的放电容量。本研究证明了杂原子工程在调节C/Cl相互作用和提高Li/Na-Cl2电池性能方面的有效性。

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引用次数: 0

Low-power and non-volatile multi-level synaptic weight update characteristics in self-selecting Nb2O5/CeO2 memristor crossbar array for in-memory computing system 内存计算系统中自选Nb2O5/CeO2忆阻交叉栅阵列的低功耗、非易失性多层次突触权更新特性

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-19 DOI: 10.1016/j.nanoen.2026.111739

Kitae Park , Hanju Ko , Peter Hayoung Chung , Jiyeon Ryu , Sola Moon , Tae-Sik Yoon

Non-filamentary valence change memory (VCM)-type memristors are considered the promising candidates as artificial synapses for in-memory computing systems to achieve high energy-efficient computing due to their analog or multi-level conductance change for training operations. However, their poor retention properties originating from unintended diffusion of redistributed oxygen ions limit their application only to the training operation, because the inference operation requires non-volatile retention of updated weights. In this study, non-volatile retention with multi-level synaptic weight update characteristics is demonstrated in non-filamentary bi-layered memristor with cerium oxide (CeO₂) and niobium oxide (Nb₂O₅), i.e., Nb₂O₅/CeO₂, where CeO₂ acts as switching layer and Nb₂O₅ serves as an oxygen ion-holding layer. Due to their high oxygen-ion conductivity and active oxygen-ion exchange property, the memristor enables polarity-dependent, linear, and symmetric analog conductance changes as weight updates, while operating stably at low power with a current range of 0.5–500 nA at + 1.5 V or below. Notably, the device exhibits long-term retention of updated weights enabling discrimination of multi-level states via stably holding oxygen ions in Nb₂O₅ layer. In addition, by employing Nb₂O₅/CeO₂ bi-layered structure, it achieves self-selecting characteristics from asymmetric Schottky contacts at oxide/electrode interfaces as well as high non-linearity ratio in half-bias operation scheme, which minimizes write disturbance and sneak current in selector-free crossbar array architecture. Using the obtained weight update characteristics, pattern recognition accuracy is simulated to be 96.6 % for MNIST handwritten patterns using CrossSim program. These linear, symmetric, and analog non-volatile conductance change with low power consumption as well as self-selecting behaviors of bi-layered Nb₂O₅/CeO₂ memristor crossbar array confirms the potential of the proposed device to be applicable to integrated in-memory computing systems that implement both efficient training and inference operations.

非丝状价变存储器（VCM）型记忆电阻器由于具有模拟或多级电导变化的特性，被认为是内存计算系统中实现高能效计算的人工突触的有希望的候选人。然而，由于再分布氧离子的意外扩散，它们的保留性能很差，这限制了它们仅在训练操作中的应用，因为推理操作需要更新权重的非易失性保留。在本研究中，以氧化铈（CeO2）和氧化铌（Nb2O5）为材料的非丝状双层记忆电阻器，即Nb2O5/CeO2中，CeO2作为开关层，Nb2O5作为氧离子保持层，证明了具有多级突触权更新特性的非挥发性保留。由于其高氧离子电导率和活性氧离子交换特性，该忆阻器可以随着重量的更新实现极性依赖、线性和对称的模拟电导变化，同时在+1.5 V或更低的低功率下稳定工作，电流范围为0.5-500 nA。值得注意的是，该器件通过稳定地保持Nb2O5层中的氧离子，能够长期保留更新的权重，从而能够区分多层次状态。此外，通过采用Nb2O5/CeO2双层结构，实现了氧化物/电极界面不对称肖特基接触的自选择特性和半偏置操作方案的高非线性比，从而最大限度地减少了无选择器交叉棒阵列结构中的写入干扰和潜流。利用得到的权值更新特征，利用CrossSim程序对MNIST手写模式进行模式识别，准确率达到96.6%。这些线性、对称和模拟的非易失性电导变化具有低功耗和自选择行为的双层Nb2O5/CeO2忆阻交叉棒阵列证实了所提出的器件适用于实现高效训练和推理操作的集成内存计算系统的潜力。

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引用次数: 0

Interface-engineered mixed-dimensional GaS/GaN heterojunction for low-noise ultraviolet photodetector and imaging 用于低噪声紫外探测器和成像的界面工程混合维GaS/GaN异质结

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-19 DOI: 10.1016/j.nanoen.2026.111738

Yutian Lin , Wenfeng Li , Siyu Zhou , Zexin Dong , Zhiyuan Zhang , Yuqing Yang , Ying Yu , Ping Liu , Xingfu Wang , Zhihong Zhu

Interface engineering is an effective strategy for enhancing the performance of optoelectronic devices. In this work, we develop a reliable interface modulation approach specifically for III-nitride materials by fabricating low-dark-current GaS/GaN heterojunction ultraviolet (UV) photodetectors (PDs) with controlled polarity and dimensionality, thereby improving both responsivity and detectivity. Compared with Ga-polar devices, the N-polar heterojunction PDs exhibit markedly superior performance: the responsivity increases from 1.13 mA/W to 143 mA/W, the specific detectivity improves from 3.4 × 10⁸ Jones to 6.58 × 10¹⁰ Jones, and the linear dynamic range is enhanced from 19 to 50 dB. Simulation results of the two heterojunction interfaces reveal that these performance enhancements arise from a stronger built-in electric field in the N-polar heterojunction, which facilitates more efficient separation of photogenerated electron-hole pairs. Furthermore, we investigate the potential of these devices for low-noise UV optical imaging, enabled by their low dark current and ultra-low NEP. Overall, this work demonstrates an effective strategy for tuning the performance of III-nitride heterojunctions and highlights their strong potential for low-noise UV detection applications.

界面工程是提高光电器件性能的有效策略。在这项工作中，我们通过制造具有可控极性和尺寸的低暗电流GaS/GaN异质结紫外（UV）光电探测器（pd），开发了一种专门针对iii -氮化物材料的可靠界面调制方法，从而提高了响应性和探测性。与ga极性器件相比，n极性异质结器件表现出明显的性能优势：响应度从1.13 mA/W提高到143 mA/W，比探测率从3.4 × 108 Jones提高到6.58 × 1010 Jones，线性动态范围从19提高到50 dB。两个异质结界面的仿真结果表明，这些性能的增强是由于n极异质结中更强的内置电场，这有助于更有效地分离光生电子-空穴对。此外，我们还研究了这些器件在低噪声紫外光学成像方面的潜力，这些器件具有低暗电流和超低NEP。总的来说，这项工作展示了一种有效的策略来调整iii -氮化物异质结的性能，并突出了它们在低噪声紫外检测应用中的强大潜力。

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引用次数: 0

Enhancing the stability of lattice oxygen and thermotolerance in LiNi0.83Co0.12Mn0.05O2 cathodes through surface-to-bulk modulation for superior electrochemical performance 通过表面-体调制提高LiNi0.83Co0.12Mn0.05O2阴极的晶格氧稳定性和耐热性，获得优异的电化学性能

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy

Pub Date : 2026-01-19 DOI: 10.1016/j.nanoen.2026.111742

Hangyu Zhang , Yanxue Wu , Xijun Xu , Fangkun Li , Yongxin Kuang , Zheng Li , Yizhong Guo , Jingwei Zhao , Zhiyuan Zeng , Jun Liu , Yanping Huo

LiNi_xCo_yMn_1−x−yO₂ (x > 0.8) are the most promising cathodes for lithium-ion batteries (LIBs) due to their high energy density. However, its practical applications are significantly hindered by an unstable cathode-electrolyte interface (CEI) and the oxidation of lattice oxygen under high voltage and elevated temperature conditions. Herein, a dual-function collaborative strategy integrating Li₅GaO₄ (LGO) coating with Ga doping is implemented for LiNi_0.83Co_0.12Mn_0.05O₂ (G-NCM83). Due to the synergistic effect of surface-to-bulk engineering, this G-NCM83 achieves an impressive capacity retention rate of 88.9 % after 400 cycles at 1 C and attains 179.8 mAh g⁻¹ after 200 cycles at 1 C under 60 ℃. The coated LGO layer can avoid the side reaction between G-NCM83 and the electrolyte, thus resulting in a stable CEI. Furthermore, multiscale characterizations verified that this dual-function collaborative strategy greatly stabilizes lattice oxygen and impedes Li/Ni cation mixing of G-NCM83, thus enhancing thermal shock tolerance from 25 to 500 °C. Density functional theory (DFT) calculation further validates that this modified G-NCM83 endows rapid Li⁺/electron transfer, mitigates HF erosion, and increases the formation energy of oxygen vacancies. This strategy integrates surface engineering and lattice modulation to reinforce lattice oxygen stability and suppress irreversible layered-spinel-rocksalt phase transitions, thereby enhancing the Thermotolerance of LiNi_0.83Co_0.12Mn_0.05O₂.

LiNixCoyMn1−x−yO2 （x >； 0.8）由于其高能量密度而成为锂离子电池（LIBs）最有前途的阴极。然而，阴极-电解质界面（CEI）的不稳定以及晶格氧在高压和高温条件下的氧化严重阻碍了其实际应用。在此基础上，对LiNi0.83Co0.12Mn0.05O2 （G-NCM83）材料实现了Li5GaO4 （LGO）涂层与Ga掺杂的双功能协同策略。由于表面-体工程的协同效应，该g - ncm83在1 ℃下循环400次后的容量保持率达到88.9 %，在1 ℃下60℃下循环200次后的容量保持率达到179.8 mAh g−1。涂覆的LGO层可以避免G-NCM83与电解质之间的副反应，从而获得稳定的CEI。此外，多尺度表征证实，这种双功能协同策略极大地稳定了晶格氧，阻碍了G-NCM83的Li/Ni阳离子混合，从而提高了25至500°C的热冲击耐冲击性。密度泛函理论（DFT）进一步验证了改性后的G-NCM83具有快速的Li+/电子转移，减轻HF侵蚀，提高氧空位的形成能。该策略将表面工程和晶格调制相结合，增强了晶格氧稳定性，抑制了不可逆层状尖晶石-岩盐相变，从而提高了LiNi0.83Co0.12Mn0.05O2的耐热性。

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引用次数: 0