Journal of Energy Chemistry最新文献_第4页

Constructing electrochemically stable single crystal Ni-rich cathode material via modification with high valence metal oxides 通过改性高价金属氧化物构建电化学性能稳定的单晶富镍阴极材料

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-17 DOI: 10.1016/j.jechem.2024.09.056

Hancheng Shi , Jiongzhi Zheng , Tao Wan , Hongqiang Wang , Zeping Wen , Fenghua Zheng , Mingru Su , Aichun Dou , Yu Zhou , Ahmad Naveed , Panpan Zhang , Hailong Wang , Ruiqiang Guo , Yunjian Liu , Dewei Chu

Single crystal Ni-rich cathode materials (SCNCM) are a good supplement in the market of nickel-based materials due to their safety and excellent electrochemical performance. However, the challenges of cation mixing, phase change during charge/discharge, and low thermal stability remain unresolved in single crystal particles. To address these issues, SCNCM are rationally modified by incorporating transition metal (TM) oxides, and the influence of metal ions with different valence states on the electrochemical properties of SCNCM is methodically explored through experimental results and theoretical calculations. Enhanced structural stability is demonstrated in SCNCM after the modifications, and the degree of improvement in the matrix materials varies depending on the valence state of doped TM ions. The highest structural stability is found in WO₃-modified SCNCM, due to the smaller effective ion radii, higher electro-negativity, stronger W–O bond, and efficient suppression of oxygen vacancy generation. As a result, WO₃-modified SCNCM have outstanding cycle performance, with a capacity retention rate of 90.2% after 200 cycles. This study provides an insight into the design of advanced SCNCM with enhanced reversibility and cyclability.

单晶富镍阴极材料（SCNCM）因其安全性和优异的电化学性能而成为镍基材料市场的良好补充。然而，单晶颗粒仍未解决阳离子混合、充放电过程中的相变以及热稳定性低等难题。为了解决这些问题，我们通过加入过渡金属（TM）氧化物对 SCNCM 进行了合理改性，并通过实验结果和理论计算，有条不紊地探讨了不同价态的金属离子对 SCNCM 电化学性能的影响。改性后，SCNCM 的结构稳定性得到增强，基体材料的改善程度因掺杂 TM 离子的价态而异。由于 WO3 改性 SCNCM 的有效离子半径更小、电负性更高、W-O 键更强以及能有效抑制氧空位的产生，因此其结构稳定性最高。因此，WO3 改性 SCNCM 具有出色的循环性能，200 次循环后的容量保持率高达 90.2%。这项研究为设计具有更强可逆性和循环性的先进 SCNCM 提供了启示。

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引用次数: 0

Stabilizing water and regulating interfacial electrostatic interaction with economical supporting salt for stable Zn metal anode 稳定水和调节与经济型支撑盐的界面静电相互作用，实现稳定的金属锌阳极

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.10.003

Yiqun Du , Rongkai Kang , Boya Zhang , Han Wang , Jianxin Zhang

Developing rechargeable aqueous Zn batteries for large-scale energy storage is impeded by inadequate reversibility and stability of the Zn anode, primarily caused by parasitic reactions and heterogeneous deposition. This study proposes an economical electrolyte strategy to address these Zn-related issues. The addition of a supporting salt enhances the thermodynamic stability of water, reduces the number of highly reactive water molecules, and modulates the interfacial electrostatic interaction. This approach effectively suppresses hydrogen evolution reaction and uncontrolled deposition. Remarkably, the rationally proportioned electrolyte allows a high average Coulombic efficiency of 99.93% for 1000 cycles in a Zn||Cu battery and a prolonged lifespan exceeding 4800 h in Zn||Zn cells. The knock-on effect is that Zn||MnO₂ pouch cells deliver stable cycling performance, demonstrating the viability of this approach for practical applications.

主要由寄生反应和异质沉积引起的锌阳极可逆性和稳定性不足阻碍了用于大规模储能的可充电锌水电池的开发。本研究提出了一种经济的电解质策略来解决这些与锌相关的问题。添加支撑盐可增强水的热力学稳定性，减少高活性水分子的数量，并调节界面静电相互作用。这种方法能有效抑制氢演化反应和不受控制的沉积。值得注意的是，合理配比的电解质使得锌||铜电池在 1000 次循环中的平均库仑效率高达 99.93%，并延长了锌||锌电池超过 4800 小时的寿命。其连锁效应是，Zn||MnO2 袋装电池具有稳定的循环性能，证明了这种方法在实际应用中的可行性。

引用次数: 0

Sulfur doping and oxygen vacancy in In2O3 nanotube co-regulate intermediates of CO2 electroreduction for efficient HCOOH production and rechargeable Zn-CO2 battery In2O3 纳米管中的硫掺杂和氧空位共同调节 CO2 电还原的中间产物，实现高效 HCOOH 生产和可充电 Zn-CO2 电池

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.09.057

Yu Li, Zhengrong Xu, Quanxin Guo, Qin Li, Rui Liu

By manipulating the distribution of surface electrons, defect engineering enables effective control over the adsorption energy between adsorbates and active sites in the CO₂ reduction reaction (CO₂RR). Herein, we report a hollow indium oxide nanotube containing both oxygen vacancy and sulfur doping (V_o-S_x-In₂O₃) for improved CO₂-to-HCOOH electroreduction and Zn-CO₂ battery. The componential synergy significantly reduces the *OCHO formation barrier to expedite protonation process and creates a favorable electronic micro-environment for *HCOOH desorption. As a result, the CO₂RR performance of V_o-S_x-In₂O₃ outperforms Pure-In₂O₃ and V_o-In₂O₃, where V_o-S₅₃-In₂O₃ exhibits a maximal HCOOH Faradaic efficiency of 92.4% at −1.2 V vs. reversible hydrogen electrode (RHE) in H-cell and above 92% over a wide window potential with high current density (119.1 mA cm⁻² at −1.1 V vs. RHE) in flow cell. Furthermore, the rechargeable Zn-CO₂ battery utilizing V_o-S₅₃-In₂O₃ as cathode shows a high power density of 2.29 mW cm⁻² and a long-term stability during charge–discharge cycles. This work provides a valuable perspective to elucidate co-defective catalysts in regulating the intermediates for efficient CO₂RR.

通过操纵表面电子的分布，缺陷工程可以有效控制二氧化碳还原反应（CO2RR）中吸附剂与活性位点之间的吸附能。在此，我们报告了一种含有氧空位和硫掺杂的空心氧化铟纳米管（Vo-Sx-In2O3），用于改进 CO2 到 HCOOH 的电还原和 Zn-CO2 电池。这种成分协同作用大大降低了 *OCHO 的形成障碍，从而加快了质子化过程，并为 *HCOOH 的解吸创造了有利的电子微环境。因此，Vo-Sx-In2O3 的 CO2RR 性能优于 Pure-In2O3 和 Vo-In2O3，其中 Vo-S53-In2O3 在氢电池中与可逆氢电极（RHE）相比，在 -1.2 V 时的 HCOOH 法拉第效率最高可达 92.4%，而在流动电池中，在宽窗口电位下的电流密度较高（与 RHE 相比，在 -1.1 V 时为 119.1 mA cm-2），其 CO2RR 效率高于 92%。此外，利用 Vo-S53-In2O3 作为阴极的可充电 Zn-CO2 电池显示出 2.29 mW cm-2 的高功率密度和充放电循环过程中的长期稳定性。这项工作为阐明共缺陷催化剂在调节高效 CO2RR 的中间产物方面提供了一个有价值的视角。

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引用次数: 0

Dual-phase interface engineering via parallel modulation strategy for highly reversible Zn metal batteries 通过并行调制策略实现双相界面工程，打造高度可逆的金属锌电池

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.09.053

Zhean Bao , Yang Wang , Kun Zhang , Guosheng Duan , Leilei Sun , Sinan Zheng , Bin Luo , Zhizhen Ye , Jingyun Huang

The reversibility and stability of aqueous Zn metal batteries (AZMBs) are largely limited by Zn dendrites and interfacial parasitic reactions. Herein, we propose a parallel modulation strategy to boost the reversibility of the Zn anode by introducing N,N,N’,N’-tetramethylchloroformamidinium hexafluorophosphate (TCFH) as an additive in the electrolyte. TCFH is composed of PF₆⁻ and TN⁺ with opposite charges. PF₆⁻ can spontaneously induce the in-situ generation of ZnF₂ solid electrolyte interface (SEI) on the anode, which can improve the transport kinetics of Zn²⁺ at the interface, thus promoting the rapid and uniform deposition of Zn as well as inhibiting the growth of dendrites. In addition, TN⁺ is enriched at the anode surface during Zn deposition through the anchoring effect, which brings a reconfiguration of the ion/molecule distribution. The anchored-TN⁺ reduces the concentrations of H₂O and SO₄²⁻, sufficiently restraining the parasitic reaction. Thanks to the dual-phase interface engineering constructed of PF₆⁻ and TN⁺ in parallel, the symmetric cell with the proposed electrolyte survives long cycling stability over 750 h at 20 mA cm⁻², 10 mAh cm⁻². This study offers a distinct viewpoint to the multidimensional optimization of Zn anodes for high-performance AZMBs.

水性锌金属电池（AZMB）的可逆性和稳定性在很大程度上受到锌枝晶和界面寄生反应的限制。在此，我们提出了一种并行调制策略，通过在电解液中引入 N,N,N',N'-四甲基氯甲脒六氟磷酸盐（TCFH）作为添加剂来提高锌阳极的可逆性。TCFH 由带相反电荷的 PF6- 和 TN+ 组成。PF6- 能在阳极上自发地诱导原位生成 ZnF2 固体电解质界面（SEI），从而改善 Zn2+ 在界面上的传输动力学，促进 Zn 的快速均匀沉积，并抑制枝晶的生长。此外，在 Zn 沉积过程中，TN+ 通过锚定效应富集在阳极表面，从而带来离子/分子分布的重新配置。锚定的 TN+ 降低了 H2O 和 SO42- 的浓度，充分抑制了寄生反应。得益于 PF6- 和 TN+并行构建的双相界面工程，使用所提议的电解质的对称电池在 20 mA cm-2 和 10 mAh cm-2 条件下可长期稳定循环 750 小时。这项研究为高性能 AZMB 的锌阳极的多维优化提供了一个独特的视角。

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引用次数: 0

Electro-functionalized 2D nitrogen-carbon nanosheets decorated with symbiotic cobalt single-atoms/clusters 用共生钴单原子/簇装饰的电功能化二维氮碳纳米片

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.09.052

Xinyan Zhou , Sifan Qiao , Zhenzhen Zhao , Meiqi Liu , Kexin Song , Fuxi Liu , Nailin Yue , Xiujuan Li , Meng Zou , Wei Zhang

Two-dimensional (2D) materials loaded with single atoms and clusters are being set at the forefront of catalysis due to their distinctive geometric and electronic features. However, the usually-complicated synthesis procedures impede in-depth clarification of their catalytic mechanisms. To this end, herein we developed an efficient one-step dimension-reduction carbonization strategy, with which we successfully architected a highly-efficient catalyst for oxygen reduction reaction (ORR), featured with symbiotic cobalt single atoms and clusters decorated in two-dimensional (2D) ultra-thin (3.5 nm thickness) nitrogen-carbon nanosheets. The synergistic effects of the two components afford excellent oxygen reduction activity in alkaline media (E_1/2 = 0.823 V vs. RHE) and thereof a high power density (146.61 mW cm⁻²) in an assembled Zn-air battery. As revealed by theoretical calculations, the cobalt clusters can regulate electrons surrounding those individual atoms and affect the adsorption of intermediate species. As a consequence, the derived active sites of single cobalt atoms lead to a significant improvement of the ORR performance. Thus, our work may fuel interests to delicate architecture of single atoms and clusters coexisting 2D support toward optimal electrocatalytic performance.

由单个原子和团簇组成的二维（2D）材料因其独特的几何和电子特征而成为催化领域的前沿技术。然而，通常复杂的合成过程阻碍了对其催化机理的深入研究。为此，我们开发了一种高效的一步还原碳化策略，成功地构建了一种高效的氧还原反应（ORR）催化剂，其特点是在二维（2D）超薄（3.5 nm 厚）氮碳纳米片中装饰了共生的钴单原子和团簇。这两种成分的协同效应使其在碱性介质中具有出色的氧还原活性（E1/2 = 0.823 V vs. RHE），并在组装的锌-空气电池中实现了高功率密度（146.61 mW cm-2）。理论计算显示，钴团簇可以调节围绕这些单个原子的电子，并影响中间物质的吸附。因此，单个钴原子衍生出的活性位点显著提高了 ORR 性能。因此，我们的工作可能会激发人们对单个原子和集群共存的二维支持物的微妙结构的兴趣，从而实现最佳的电催化性能。

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引用次数: 0

Magnetically-responsive phase change thermal storage materials: Mechanisms, advances, and beyond 磁响应相变蓄热材料：机理、进展及其他

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.09.055

Yan Gao , Yang Li , Jinjie Lin , Panpan Liu , Xiao Chen , Ge Wang

Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials (PCMs). Magnetically-responsive phase change thermal storage materials are considered an emerging concept for energy storage systems, enabling PCMs to perform unprecedented functions (such as green energy utilization, magnetic thermotherapy, drug release, etc.). The combination of multifunctional magnetic nanomaterials and PCMs is a milestone in the creation of advanced multifunctional composite PCMs. However, a timely and comprehensive review of composite PCMs based on magnetic nanoparticle modification is still missing. Herein, we furnish an exhaustive exposition elucidating the cutting-edge advancements in magnetically responsive composite PCMs. We delve deeply into the multifarious roles assumed by distinct nanoparticles within composite PCMs of varying dimensions, meticulously scrutinizing the intricate interplay between their architectures and thermophysical attributes. Moreover, we prognosticate future research trajectories, delineate alternative stratagems, and illuminate prospective avenues. This review is intended to stimulate broader academic interest in interdisciplinary fields and provide valuable insights into the development of next-generation magnetically-responsive composite PCMs.

热管理技术的飞速发展和多能源转换需求的不断增加，对下一代形状稳定的复合相变材料（PCM）提出了严格的能效要求。磁响应相变储热材料被认为是储能系统的新兴概念，可使 PCMs 发挥前所未有的功能（如绿色能源利用、磁热疗法、药物释放等）。多功能磁性纳米材料与 PCM 的结合是创造先进多功能复合 PCM 的里程碑。然而，关于基于磁性纳米粒子改性的复合 PCM 的及时而全面的综述仍然缺失。在此，我们将详尽阐述磁响应复合 PCM 的前沿进展。我们深入探讨了不同纳米粒子在不同尺寸的复合 PCM 中扮演的各种角色，仔细研究了它们的结构和热物理属性之间错综复杂的相互作用。此外，我们还预测了未来的研究轨迹，勾勒了替代策略，并阐明了前瞻性的研究途径。本综述旨在激发跨学科领域更广泛的学术兴趣，并为下一代磁响应复合 PCM 的开发提供有价值的见解。

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引用次数: 0

Hybrid conductive-lithophilic-fluoride triple protection interface engineering: Dendrite-free reverse lithium deposition for high-performance lithium metal batteries 混合导电-嗜石-氟化物三重保护界面工程：用于高性能锂金属电池的无枝晶反向锂沉积技术

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.10.002

Huiying Li , Chang Hong , Runming Tao , Xiaolang Liu , Jianxing Wang , Jianyu Chen , Shuhao Yao , Jiazhi Geng , Guang Zheng , Jiyuan Liang

Lithium metal batteries (LMBs) with high energy density are impeded by the instability of solid electrolyte interface (SEI) and the uncontrolled growth of lithium (Li) dendrite. To mitigate these challenges, optimizing the SEI structure and Li deposition behavior is the key to stable LMBs. This study novelty proposes a facile synthesis of MgF₂/carbon (C) nanocomposite through the mechanochemical reaction between metallic Mg and polytetrafluoroethylene (PTFE) powders, and its modified polypropylene (PP) separator enhances LMB performance. The in-situ formed highly conductive fluorine-doped C species play a crucial role in facilitating ion/electron transport, thereby accelerating electrochemical kinetics and altering Li deposition direction. During cycling, the in-situ reaction between MgF₂ and Li leads to the formation of LiMg alloy, along with a LiF-rich SEI layer, which reduces the nucleation overpotential and reinforces the interphase strength, leading to homogeneous Li deposition with dendrite-free feature. Benefiting from these merits, the Li metal is densely and uniformly deposited on the MgF₂/C@PP separator side rather than on the current collector side. Furthermore, the symmetric cell with MgF₂/C@PP exhibits superb Li plating/stripping performance over 2800 h at 1 mA cm⁻² and 2 mA h cm⁻². More importantly, the assembled Li@MgF₂/C@PP|LiFePO₄ full cell with a low negative/positive ratio of 3.6 delivers an impressive cyclability with 82.7% capacity retention over 1400 cycles at 1 C.

固态电解质界面（SEI）的不稳定性和锂（Li）枝晶的不可控生长阻碍了高能量密度的锂金属电池（LMB）的发展。为了缓解这些挑战，优化 SEI 结构和锂沉积行为是获得稳定 LMB 的关键。本研究通过金属镁和聚四氟乙烯（PTFE）粉末之间的机械化学反应，新颖地提出了一种简便的 MgF2/carbon (C) 纳米复合材料的合成方法，其改性聚丙烯（PP）隔膜提高了 LMB 的性能。原位形成的高导电性掺氟 C 物种在促进离子/电子传输方面发挥了关键作用，从而加速了电化学动力学并改变了锂沉积方向。在循环过程中，MgF2 和锂之间的原位反应会形成锂镁合金以及富含 LiF 的 SEI 层，从而降低了成核过电位并增强了相间强度，导致锂沉积均匀且无枝晶。得益于这些优点，锂金属密集而均匀地沉积在 MgF2/C@PP 分离器一侧，而不是集流器一侧。此外，带有 MgF2/C@PP 的对称电池在 1 mA cm-2 和 2 mA h cm-2 下的 2800 小时内表现出卓越的锂镀层/剥离性能。更重要的是，组装好的 Li@MgF2/C@PP|LiFePO4 全电池的负极/正极比低至 3.6，在 1 C 温度下循环 1400 次，容量保持率达到 82.7%，循环性能令人印象深刻。

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引用次数: 0

Reversible Li plating regulation on graphite anode through a barium sulfate nanofibers-based dielectric separator for fast charging and high-safety lithium-ion battery 通过基于硫酸钡纳米纤维的电介质隔膜对石墨负极进行可逆锂电镀调节，实现快速充电和高安全性锂离子电池

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.08.053

Yaxin Zhang , Long Cheng , Ying-Jie Zhu , Jin Wu , Han-Ping Yu , Sida Xie , Dandan Li , Zhaohui Wang , Heng Li

Poor Li plating reversibility and high thermal runaway risks are key challenges for fast charging lithium-ion batteries with graphite anodes. Herein, a dielectric and fire-resistant separator based on hybrid nanofibers of barium sulfate (BS) and bacterial cellulose (BC) is developed to synchronously enhance the battery’s fast charging and thermal-safety performances. The regulation mechanism of the dielectric BS/BC separator in enhancing the Li⁺ ion transport and Li plating reversibility is revealed. (1) The Max-Wagner polarization electric field of the dielectric BS/BC separator can accelerate the desolvation of solvated Li⁺ ions, enhancing their transport kinetics. (2) Moreover, due to the charge balancing effect, the dielectric BS/BC separator homogenizes the electric field/Li⁺ ion flux at the graphite anode-separator interface, facilitating uniform Li plating and suppressing Li dendrite growth. Consequently, the fast-charge graphite anode with the BS/BC separator shows higher Coulombic efficiency (99.0% vs. 96.9%) and longer cycling lifespan (100 cycles vs. 59 cycles) than that with the polypropylene (PP) separator in the constant-lithiation cycling test at 2 mA cm⁻². The high-loading LiFePO₄ (15.5 mg cm⁻²)//graphite (7.5 mg cm⁻²) full cell with the BS/BC separator exhibits excellent fast charging performance, retaining 70% of its capacity after 500 cycles at a high rate of 2C, which is significantly better than that of the cell with the PP separator (retaining only 27% of its capacity after 500 cycles). More importantly, the thermally stable BS/BC separator effectively elevates the critical temperature and reduces the heat release rate during thermal runaway, thereby significantly enhancing the battery’s safety.

镀锂可逆性差和热失控风险高是石墨负极快速充电锂离子电池面临的主要挑战。本文开发了一种基于硫酸钡（BS）和细菌纤维素（BC）混合纳米纤维的电介质耐火隔膜，以同步提高电池的快速充电性能和热安全性能。揭示了 BS/BC 介电隔膜在增强锂离子传输和锂电镀可逆性方面的调节机制。(1）电介质 BS/BC 隔离层的 Max-Wagner 极化电场可加速溶解的 Li+ 离子的解溶解，增强其传输动力学。(2) 此外，由于电荷平衡效应，电介质 BS/BC 分离器可使石墨阳极-分离器界面上的电场/Li+ 离子通量均匀化，从而促进锂的均匀电镀并抑制锂枝晶的生长。因此，在 2 mA cm-2 的恒定锂化循环测试中，使用 BS/BC 隔离层的快充石墨阳极比使用聚丙烯（PP）隔离层的阳极具有更高的库仑效率（99.0% 对 96.9%）和更长的循环寿命（100 次对 59 次）。使用 BS/BC 隔膜的高负载磷酸铁锂（15.5 毫克/厘米-2）/石墨（7.5 毫克/厘米-2）全电池具有出色的快速充电性能，在 2C 的高倍率下循环 500 次后仍能保持 70% 的容量，明显优于使用 PP 隔膜的电池（循环 500 次后仅能保持 27% 的容量）。更重要的是，热稳定的 BS/BC 隔膜有效地提高了临界温度，降低了热失控时的热释放率，从而大大提高了电池的安全性。

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引用次数: 0

Enhanced battery life prediction with reduced data demand via semi-supervised representation learning 通过半监督表征学习减少数据需求，提高电池寿命预测能力

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.10.001

Liang Ma , Jinpeng Tian , Tieling Zhang , Qinghua Guo , Chi Yung Chung

Accurate prediction of the remaining useful life (RUL) is crucial for the design and management of lithium-ion batteries. Although various machine learning models offer promising predictions, one critical but often overlooked challenge is their demand for considerable run-to-failure data for training. Collection of such training data leads to prohibitive testing efforts as the run-to-failure tests can last for years. Here, we propose a semi-supervised representation learning method to enhance prediction accuracy by learning from data without RUL labels. Our approach builds on a sophisticated deep neural network that comprises an encoder and three decoder heads to extract time-dependent representation features from short-term battery operating data regardless of the existence of RUL labels. The approach is validated using three datasets collected from 34 batteries operating under various conditions, encompassing over 19,900 charge and discharge cycles. Our method achieves a root mean squared error (RMSE) within 25 cycles, even when only 1/50 of the training dataset is labelled, representing a reduction of 48% compared to the conventional approach. We also demonstrate the method’s robustness with varying numbers of labelled data and different weights assigned to the three decoder heads. The projection of extracted features in low space reveals that our method effectively learns degradation features from unlabelled data. Our approach highlights the promise of utilising semi-supervised learning to reduce the data demand for reliability monitoring of energy devices.

准确预测剩余使用寿命（RUL）对于锂离子电池的设计和管理至关重要。虽然各种机器学习模型都能提供有前景的预测，但一个关键但经常被忽视的挑战是，这些模型需要大量的运行至失效数据进行训练。收集这些训练数据会导致测试工作令人望而却步，因为从运行到失效的测试可能会持续数年之久。在此，我们提出了一种半监督表示学习方法，通过从无 RUL 标签的数据中学习来提高预测准确性。我们的方法基于复杂的深度神经网络，该网络由一个编码器和三个解码头组成，可从短期电池运行数据中提取随时间变化的表征特征，而无需考虑是否存在 RUL 标签。我们使用从 34 个在不同条件下工作的电池中收集的三个数据集对该方法进行了验证，这些数据集包含超过 19,900 个充放电周期。即使只有 1/50 的训练数据集被标记，我们的方法也能在 25 个周期内实现均方根误差 (RMSE)，与传统方法相比减少了 48%。我们还展示了该方法在使用不同数量的标记数据和分配给三个解码器头的不同权重时的鲁棒性。低空间提取特征的投影显示，我们的方法能有效地从未标明的数据中学习退化特征。我们的方法凸显了利用半监督学习减少能源设备可靠性监测数据需求的前景。

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引用次数: 0

Bioinspired smart dual-layer hydrogels system with synchronous solar and thermal radiation modulation for energy-saving all-season temperature regulation 具有太阳能和热辐射同步调制功能的生物启发智能双层水凝胶系统，可实现节能型四季温度调节

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-11 DOI: 10.1016/j.jechem.2024.09.051

Meng-Chen Huang , Chao-Hua Xue , Zhongxue Bai , Jun Cheng , Yong-Gang Wu , Chao-Qun Ma , Li Wan , Long Xie , Hui-Di Wang , Bing-Ying Liu , Xiao-Jing Guo

All-season thermal management with zero energy consumption and emissions is more crucial to global decarbonization over traditional energy-intensive cooling/heating systems. However, the static single thermal management for cooling or heating fails to self-regulate the temperature in dynamic seasonal temperature condition. Herein, inspired by the dual-temperature regulation function of the fur color changes on the backs and abdomens of penguins, a smart thermal management composite hydrogel (PNA@H-PM Gel) system was subtly created though an “on-demand” dual-layer structure design strategy. The PNA@H-PM Gel system features synchronous solar and thermal radiation modulation as well as tunable phase transition temperatures to meet the variable seasonal thermal requirements and energy-saving demands via self-adaptive radiative cooling and solar heating regulation. Furthermore, this system demonstrates superb modulations of both the solar reflectance (ΔR = 0.74) and thermal emissivity (ΔE = 0.52) in response to ambient temperature changes, highlighting efficient temperature regulation with average radiative cooling and solar heating effects of 9.6 °C in summer and 6.1 °C in winter, respectively. Moreover, compared to standard building baselines, the PNA@H-PM Gel presents a more substantial energy-saving cooling/heating potentials for energy-efficient buildings across various regions and climates. This novel solution, inspired by penguins in the real world, will offer a fresh approach for producing intelligent, energy-saving thermal management materials, and serve for temperature regulation under dynamic climate conditions and even throughout all seasons.

与传统的高能耗制冷/制热系统相比，零能耗和零排放的四季热管理对全球去碳化更为重要。然而，静态的单一制冷或制热热管理无法在动态的季节性温度条件下实现温度的自我调节。在此，受企鹅背部和腹部毛色变化的双重温度调节功能启发，通过 "按需 "双层结构设计策略，巧妙地创建了一种智能热管理复合水凝胶（PNA@H-PM Gel）系统。PNA@H-PM 凝胶系统具有同步太阳辐射和热辐射调制以及可调相变温度的特点，可通过自适应辐射冷却和太阳加热调节来满足不同季节的热需求和节能要求。此外，该系统还能根据环境温度的变化对太阳反射率（ΔR = 0.74）和热辐射率（ΔE = 0.52）进行出色的调节，从而实现高效的温度调节，其夏季平均辐射制冷和冬季平均辐射供暖效果分别为 9.6 °C和 6.1 °C。此外，与标准建筑基线相比，PNA@H-PM 凝胶为不同地区和气候条件下的节能建筑提供了更大的节能制冷/制热潜力。这种从现实世界中的企鹅获得灵感的新型解决方案将为生产智能节能热管理材料提供一种全新的方法，并可用于动态气候条件下的温度调节，甚至四季皆宜。

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