Journal of Power Sources最新文献_第4页

Impact of Mn/Ni and Li/(Mn+Ni) ratios on phase equilibrium and electrochemical performance of the high voltage spinel LiNi0.5Mn1.5O4 锰/镍和锂/（锰+镍）比率对高压尖晶石 LiNi0.5Mn1.5O4 的相平衡和电化学性能的影响

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-24 DOI: 10.1016/j.jpowsour.2024.235447

LiNi_0.5Mn_1.5O₄ (LNMO) emerges as a promising spinel-type positive electrode material for lithium-ion batteries (LIBs) due to its low cost and high operating voltage (4.8 V vs. Li⁺/Li), attributed to the Ni⁴⁺/Ni³⁺/Ni²⁺ redox couples, which contribute to high energy density, a crucial requirement for next-generation LIBs. In this study, we investigate the influence of Mn/Ni and Li/(Mn + Ni) ratios on the phase equilibrium and electrochemical performance of LNMO positive electrode materials. A series of 18 samples were synthesized using a two-stage solid-state method with varying Mn/Ni and Li/(Mn + Ni) ratios and annealing under different atmospheres. These synthesis conditions have major impact on the composition and level of purity of LNMO phases, as well as on the nature of the impurities themselves. Mn excess significantly enhances the electrochemical performance, with superior discharge capacity, coulombic efficiency, and capacity retention for the Mn-rich sample with Li/(Mn + Ni) = 0.50. A comprehensive structural analysis combining synchrotron X-ray and neutron powder diffraction gives an in-depth characterization of these samples with a clear differentiation between the global Mn content within samples and that within the LNMO phase.

LiNi0.5Mn1.5O4（LNMO）因其低成本和高工作电压（与 Li+/Li 相比为 4.8 V）而成为一种很有前途的锂离子电池（LIB）尖晶石型正极材料，这归功于 Ni4+/Ni3+/Ni2+ 氧化还原偶联，有助于实现高能量密度，而高能量密度是下一代 LIB 的关键要求。本研究探讨了锰/镍和锂/（锰+镍）比对 LNMO 正极材料相平衡和电化学性能的影响。我们采用两级固态法合成了一系列 18 个样品，并改变了 Mn/Ni 和 Li/（Mn + Ni）的比例，然后在不同的气氛下进行退火。这些合成条件对 LNMO 相的组成和纯度水平以及杂质本身的性质有重大影响。锰过量会明显提高电化学性能，锂/（锰+镍）=0.50 的富锰样品具有更高的放电容量、库仑效率和容量保持率。同步辐射 X 射线和中子粉末衍射相结合的综合结构分析深入分析了这些样品的特性，明确区分了样品中的总体锰含量和 LNMO 相中的锰含量。

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引用次数: 0

3D printed cathodes for microbial electrolysis cell-assisted anaerobic digester: Evaluation of performance, resilience, and fluid dynamics 用于微生物电解池辅助厌氧消化器的 3D 打印阴极：性能、弹性和流体动力学评估

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-24 DOI: 10.1016/j.jpowsour.2024.235461

This study comprehensively evaluated the performance of 3D printed electrodes with different lattice structures (Cubic, Diamond, Schwartz, and SplitP) in microbial electrolysis cell-assisted anaerobic digestion (MEC-AD) systems under various power supply conditions (24 h ON, 18 h ON, 12 h ON, and 6 h ON). The shortest startup time (2 days) and the highest biomethane production (534.8 ± 30 L/m³) under continuous power supply mode (24 h ON) was achieved by SplitP-MEC-AD, which possessed the largest surface area, but it achieved the lowest current density generation and biomethane production under intermittent power supply modes (18 h–6 h ON). The computational fluid dynamics analysis revealed that SplitP-MEC-AD experienced significantly high turbulence (turbulent kinetic energy = 0.86141 m²/s², max fluid velocity = 2.95 m/s), which may have hindered the cathode biofilm combined with unfavorable intermittent power supply conditions. The highest current densities were always achieved by Cubic-MEC-AD, which had the lowest resistance. Diamond-MEC-AD (larger surface area and lower resistance) achieved the highest biomethane generation (411.4 ± 53.7 L/m³) during the intermittent power supply. Cathodic microbial communities differed significantly among MEC-ADs, possibly due to varying geometries. Our research indicates that both Cubic and Diamond electrodes are suitable cathode choices for MEC-AD systems with further modifications.

本研究全面评估了不同晶格结构（立方体、金刚石、施瓦茨和SplitP）的三维打印电极在不同供电条件（24 h ON、18 h ON、12 h ON和6 h ON）下的微生物电解池辅助厌氧消化（MEC-AD）系统中的性能。拥有最大表面积的 SplitP-MEC-AD 在连续供电模式（24 h ON）下的启动时间最短（2 天），生物甲烷产量最高（534.8 ± 30 L/m3），但在间歇供电模式（18 h-6 h ON）下的电流密度和生物甲烷产量最低。计算流体动力学分析表明，SplitP-MEC-AD 的湍流明显较高（湍流动能 = 0.86141 m2/s2，最大流体速度 = 2.95 m/s），这可能与不利的间歇供电条件相结合，阻碍了阴极生物膜的形成。立方-MEC-AD 的电流密度最高，电阻最小。在间歇供电期间，Diamond-MEC-AD（表面积更大、电阻更低）的生物甲烷产生量最高（411.4 ± 53.7 升/立方米）。不同 MEC-AD 的阴极微生物群落差异很大，这可能是由于几何形状不同造成的。我们的研究表明，立方体电极和金刚石电极都是适合 MEC-AD 系统的阴极选择，只需进一步改良即可。

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引用次数: 0

Designing multifunctional, 3D cross-linked network binder for actual use in high performance lithium ion batteries silicon based anodes 设计用于高性能锂离子电池硅基阳极的多功能三维交联网络粘合剂

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-24 DOI: 10.1016/j.jpowsour.2024.235490

Binders have been proved to be an economical and effective approach for accelerating the industrial application of silicon based anodes. Herein, a 3D network binder (H-PAN-g-ECH) with multifunctional groups, is constructed by crosslinking polyacrylonitrile (PAN) hydrolysate (H-PAN) with epichlorohydrin (ECH). Strong polar groups carboxylate (-COO^-) and amide (-CONH₂) obtained from hydrolysis of PAN as well as the original cyanide (-CN) enhance the adhesive ability of H-PAN-g-ECH to not only active material but also current collector, and thus sustain the structure integrity of the electrode. In addition, the network structure proposed by linking H-PAN with short-chain molecules endows H-PAN-g-ECH with facilitated Li-ion transmission and improved mechanical property to accommodate the great volume variation of Si during cycling. The as-prepared H-PAN-g-ECH possesses multiple interfacial adhesion and robust mechanical performance, which improves the electrochemical property of silicon anode with high areal capacity. In combination with good processability, H-PAN-g-ECH is verified to be a superior binder in use of practical Si based anodes.

事实证明，粘结剂是加速硅基阳极工业应用的一种经济而有效的方法。本文通过将聚丙烯腈（PAN）水解物（H-PAN）与环氧氯丙烷（ECH）交联，构建了一种具有多功能基团的三维网络粘结剂（H-PAN-g-ECH）。通过水解 PAN 得到的强极性基团羧酸盐（-COO-）和酰胺（-CONH2）以及原始的氰化物（-CN）增强了 H-PAN-g-ECH 与活性材料和集流体的粘合能力，从而维持了电极结构的完整性。此外，H-PAN 与短链分子连接形成的网络结构还赋予了 H-PAN-g-ECH 更好的锂离子传输性能和机械性能，以适应硅在循环过程中的巨大体积变化。制备的 H-PAN-g-ECH 具有多种界面粘附性和良好的机械性能，从而改善了硅阳极的电化学性能，并具有较高的电容。结合良好的加工性，H-PAN-g-ECH 被证实是一种用于实用硅基阳极的优质粘结剂。

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引用次数: 0

Enhancing the electrochemical properties of polyethylene oxide solid-state electrolytes based on a small nano-sized UiO-66 metal-organic framework 基于纳米级 UiO-66 金属有机框架增强聚氧化乙烯固态电解质的电化学性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-23 DOI: 10.1016/j.jpowsour.2024.235512

Metal-organic frameworks (MOFs) have garnered significant attention in the field of Lithium-ion batteries due to their porous periodic network properties. However, this is a challenge to design high-performance solid-state electrolytes reasonably. Herein, a small nano-sized MOF Small-UiO-66 is reported, which has high surface area and mesoporous properties that can effectively inhibit PEO matrix crystallization. The presence of Small-UiO-66 accelerates the dissociation of lithium salts, which disrupts the ordered arrangement of the PEO chain segments. The abundant Lewis acidic sites on the surface of Small-UiO-66 facilitate the construction of abundant Li⁺ transport channels and promote Li⁺ conduction. Furthermore, the smaller nano-sized increase the interfacial wettability with lithium metal, which promotes the uniform diffusion of Li⁺ and inhibits the growth of lithium dendrites. The results indicate that 0.1 Zr-CSE exhibits high ionic conductivities of 6.94 × 10⁻⁴ S/cm at 60 °C. Based on 0.1 Zr-CSE, the Li||Li symmetric cell can operate stably for 1200 h at a current density of 0.1 mA/cm², and the LFP||Li cell also achieves a high initial capacity of 147.65 mAh·g⁻¹ at current densities of 0.5C. This work presents a novel approach for preparing high-performance solid-state Lithium-ion batteries using MOFs as fillers for polymer solid-state electrolytes.

金属有机框架（MOFs）因其多孔周期性网络特性而在锂离子电池领域备受关注。然而，如何合理地设计高性能固态电解质却是一个挑战。本文报道了一种小型纳米级 MOF Small-UiO-66，它具有高比表面积和介孔特性，能有效抑制 PEO 基体结晶。Small-UiO-66 的存在加速了锂盐的解离，从而破坏了 PEO 链段的有序排列。Small-UiO-66 表面丰富的路易斯酸位点有助于构建丰富的锂+传输通道，促进锂+传导。此外，较小的纳米尺寸增加了与金属锂的界面润湿性，促进了 Li+ 的均匀扩散，抑制了锂枝晶的生长。结果表明，0.1 Zr-CSE 在 60 °C 时的离子电导率高达 6.94 × 10-4 S/cm。基于 0.1 Zr-CSE，锂||锂对称电池可在 0.1 mA/cm2 的电流密度下稳定运行 1200 h，而 LFP||Li 电池也可在 0.5C 电流密度下实现 147.65 mAh-g-1 的高初始容量。这项研究提出了一种利用 MOFs 作为聚合物固态电解质填料制备高性能固态锂离子电池的新方法。

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引用次数: 0

Optimizing charge transfer and paradox reaction to enhance the performance of Fe3O4 anodes for aqueous energy storage 优化电荷转移和悖论反应以提高用于水储能的 Fe3O4 阳极的性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-23 DOI: 10.1016/j.jpowsour.2024.235502

The Fe₃O₄ anodes are appealing in these devices (aqueous hybrid capacitors, metal-iodine batteries, Ni-Fe batteries, etc.) due to their high capacity, safety. However, due to the paradox reaction, the reported Fe₃O₄ anodes exhibit unsatisfactory charging/discharging plateau, low coulombic efficiency, narrow charging potential. Here, we find that the optimized testing configuration (removing binders, eliminating current collector, and decreasing O₂) can increase charge transport, suppress hydrogen evolution reaction (HER), and reduce natural oxidation, then improve redox reaction and promote the performance of the Fe₃O₄ anode. Specifically, by increasing charge transport without binders, the charging/discharging plateau of Fe₃O₄ anodes can be narrowed by 18.4 % compared with that with binders. By suppressing HER without a current collector, it can reduce charging time by ca. 42.7 %. Reducing natural oxidation can hinder the fragmentation of the Fe₃O₄ anode, improving the cycle stability from 71.6 % to 81.8 % after 200 cycles. The optimized testing configuration can also decrease the paradox reaction in carbon-coated Fe₃O₄@C, narrowing the redox peak interval by ca. 14.7 %, decreasing the charging time by 53.4 %, and increasing the cyclic stability to 98.7 % after 200 cycles. This work favors understanding the paradox reaction in the electrochemical process and increasing the practical applications of the Fe₃O₄ anode.

Fe3O4阳极因其高容量和安全性，在这些设备（水混合电容器、金属碘电池、镍铁电池等）中颇具吸引力。然而，由于悖论反应，已报道的 Fe3O4 阳极表现出不尽人意的充电/放电高原、低库仑效率和窄充电电位。在这里，我们发现优化的测试配置（去除粘合剂、取消集流器和减少氧气）可以增加电荷传输、抑制氢进化反应（HER）和减少自然氧化，进而改善氧化还原反应，提高 Fe3O4 阳极的性能。具体来说，通过增加电荷传输而不使用粘合剂，Fe3O4 阳极的充放电高原比使用粘合剂时缩小了 18.4%。在不使用集流器的情况下抑制 HER，可将充电时间缩短约 42.7%。减少自然氧化可阻碍 Fe3O4 阳极的破碎，从而在 200 次循环后将循环稳定性从 71.6% 提高到 81.8%。优化的测试配置还能减少碳涂层 Fe3O4@C 中的悖论反应，使氧化还原峰间隔缩小约 14.7%，充电时间缩短 53.4%，循环稳定性在 200 次循环后提高到 98.7%。这项工作有助于理解电化学过程中的悖论反应，并增加 Fe3O4 阳极的实际应用。

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引用次数: 0

Development of a 4-in-1 device for measuring properties of gas diffusion layers and porous transport layers in proton exchange membrane fuel cells and water electrolyzers 开发用于测量质子交换膜燃料电池和水电解槽中气体扩散层和多孔传输层特性的四合一装置

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-23 DOI: 10.1016/j.jpowsour.2024.235460

The carbon-based gas diffusion layer (GDL) and the Ti-based porous transport layer (PTL) are essential components in proton exchange membrane (PEM) fuel cells and water electrolyzers, respectively. The performance of these cells is significantly influenced by the properties of the GDL/PTL, especially under operational compression. This study utilizes a previously developed 4-in-1 device designed to simultaneously measure parameters under compression (UC), including thickness (TUC), resistivity (RUC, through-plane), and in-plane permeability (IPP-UC), and to separately measure through-plane permeability (TPP). The simultaneous measurement of TUC, RUC, and IPP-UC is achieved using an annular sample. Through the use of a two-piece adapter, TPP can also be measured using a disk sample. The device successfully measured TUC, RUC, IPP-UC, and TPP for diverse GDLs and PTLs, including commercially available and in-house prepared materials. The results were compared, showing variability in compressibility (by up to 45 % at 4 MPa), resistivity (with differences up to 25-fold at 1 MPa), and permeability (comparable at 1 MPa) among samples investigated. The 4-in-1 device has proven effective for GDL/PTL characterization, supporting component development and quality control in both the PEM fuel cell and water electrolyzer technologies.

碳基气体扩散层（GDL）和钛基多孔传输层（PTL）分别是质子交换膜（PEM）燃料电池和水电解槽的重要组成部分。这些电池的性能受 GDL/PTL 性能的影响很大，尤其是在工作压缩的情况下。本研究采用了之前开发的四合一装置，旨在同时测量压缩（UC）下的参数，包括厚度（TUC）、电阻率（RUC，通面）和面内渗透率（IPP-UC），并单独测量通面渗透率（TPP）。使用环形样品可同时测量 TUC、RUC 和 IPP-UC。通过使用两件式适配器，还可以使用圆盘样品测量 TPP。该设备成功测量了各种 GDL 和 PTL 的 TUC、RUC、IPP-UC 和 TPP，包括市售材料和内部制备的材料。比较结果表明，所调查的样品在可压缩性（4 兆帕时高达 45%）、电阻率（1 兆帕时差异高达 25 倍）和渗透性（1 兆帕时相当）方面存在差异。事实证明，四合一装置可有效进行 GDL/PTL 表征，支持 PEM 燃料电池和水电解槽技术的组件开发和质量控制。

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引用次数: 0

Precisely designed 3-stage calcination strategy for lithium-rich manganese-based cathodes with improved cycling performance 针对富锂锰基正极精确设计的 3 级煅烧策略，可提高循环性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-23 DOI: 10.1016/j.jpowsour.2024.235497

The poor cycling performance of Li-rich manganese-based (LMR) cathodes is one of the challenges that need to be urgently overcome. Enhancing the stability of the layered structure responsible for lithium-ion diffusion is an effective way to improve the cycling performance. Layered structures are mainly formed during the high-temperature solid-phase reaction, whereas the prolonged and constant-high-temperature calcination conditions in conventional calcination procedure may pose a threat to the layered structural stability. Thus, in order to optimize the formation environment of layered structures under high-temperature solid-phase reaction, we have designed suitable temperature-controlled strategies for each stage of layered structure formation, gradual maturation, and post-treatment, respectively, referred to as the 3-stage calcination strategy. This calcination strategy contributes to the formation of a more ordered and stable layered structure, which significantly improves the cycling performance of LMR cathodes (capacity retention rate of 85.2 % after 200 cycles at 1C). The shortening of the constant high temperature calcination time helps to further reduce the production cost of the batteries. The design concept of this work is to regulate the formation process of layered structures in stages, which provides inspiration for the efficient and controllable synthesis of electrode materials with excellent structural stability at low production cost.

富锂锰基（LMR）阴极的循环性能较差，这是亟待解决的难题之一。提高负责锂离子扩散的层状结构的稳定性是改善循环性能的有效方法。层状结构主要是在高温固相反应过程中形成的，而传统煅烧过程中长时间持续的高温煅烧条件可能会对层状结构的稳定性造成威胁。因此，为了优化层状结构在高温固相反应下的形成环境，我们针对层状结构形成、逐渐成熟和后处理的各个阶段分别设计了合适的温控策略，即三阶段煅烧策略。这种煅烧策略有助于形成更有序、更稳定的层状结构，从而显著提高 LMR 阴极的循环性能（在 1C 下循环 200 次后，容量保持率为 85.2%）。恒定高温煅烧时间的缩短有助于进一步降低电池的生产成本。这项工作的设计理念是分阶段调节层状结构的形成过程，这为以低生产成本高效、可控地合成具有优异结构稳定性的电极材料提供了灵感。

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引用次数: 0

Core collapse in cylindrical Li-ion batteries 圆柱形锂离子电池的电芯塌陷

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-23 DOI: 10.1016/j.jpowsour.2024.235471

Cylindrical lithium-ion batteries are manufactured with a jelly roll structure of tightly wound electrode layers separated by separators. Core collapse occurs when multiple layers adjacent to the core of the jelly roll deform inward. This paper reviews the experimental and stress modeling analysis studies of core collapse initiation and evolution with charge-discharge cycles. Areas of agreement and conflicting opinions on the causes of core collapse are discussed. Euler and hoop buckling analysis are conducted for baseline comparison with reported causes of core collapse and mathematical modeling in the literature. Recommendations for future studies are suggested for determining the dominant factors affecting core collapse, conducting experiments to assess core collapse degradation paths, and providing suggestions for modeling.

圆柱形锂离子电池采用果冻卷结构制造，电极层紧密缠绕，中间用隔板隔开。当果冻卷核心相邻的多个层向内变形时，就会发生核心塌陷。本文回顾了有关电芯塌陷开始和随充放电循环演变的实验和应力建模分析研究。文中讨论了对果冻卷芯塌陷原因的一致看法和相互冲突的观点。进行了欧拉和箍屈曲分析，以便与文献中报告的堆芯坍塌原因和数学模型进行基线比较。为今后的研究提出了建议，以确定影响堆芯坍塌的主要因素，进行实验以评估堆芯坍塌退化路径，并为建模提供建议。

引用次数: 0

Self-supporting multi-carbon composites assist recycled-silicon for high-performance lithium storage 自支撑多碳复合材料辅助再生硅实现高性能锂存储

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-23 DOI: 10.1016/j.jpowsour.2024.235439

Silicon from retired photovoltaic panels (PV) is an important raw material for high-performance silicon-based anodes. Silicon from recycled photovoltaic panels is reactivated using high-energy ball milling in the nano scale and directly composited in on the carbon paper by means of spraying, hot-pressing treatment and chemical vapor deposition. Rational control of the composite materials is further fulfilled by introduction of additional carbon source (Resin, Expanded Graphite and Methane.) and corresponding carbonization treatment. We immobilized nanosilicon via resin-derived carbon between expanded graphite flakes and loaded them into a carbon paper framework, while the outer layer was homogeneously coated with deposited carbon. (named as CP/Si/C_R/C_EG/C_D). The rationally matched carbon materials build a stable self-supporting structure and an efficient conductive network of the recycled silicon-anode material. CP/Si/C_R/C_EG/C_D electrode with stable cycling performance of 1234 mAh g⁻¹ after 400 cycles at 2 A g⁻¹, and an outstanding rate performance (2237.7, 2132.5, 1997.9, 1840.8, 1677.3, 1534.8, and 1357 mAh g⁻¹ at 0.1, 0.2, 0.5, 1, 2, 2.5, and 3 A g⁻¹). Therefore, this work provides a viable option for recycled-silicon from retired PV panels to be reused in high value-added ways into lithium-ion batteries.

从报废光伏电池板（PV）中提取的硅是制造高性能硅基阳极的重要原材料。利用纳米级高能球磨技术重新激活回收光伏板中的硅，并通过喷涂、热压处理和化学气相沉积等方法将其直接复合在碳纸上。通过引入附加碳源（树脂、膨胀石墨和甲烷）和相应的碳化处理，进一步实现了对复合材料的合理控制。我们通过树脂衍生碳将纳米硅固定在膨胀石墨片之间，并将其装入碳纸框架中，同时在外层均匀地涂覆沉积碳。(这些碳材料被命名为 CP/Si/CR/CEG/CD）。合理搭配的碳材料为再生硅阳极材料构建了稳定的自支撑结构和高效的导电网络。CP/Si/CR/CEG/CD 电极在 2 A g-1 的条件下循环 400 次后，可达到 1234 mAh g-1 的稳定循环性能，并且具有出色的速率性能（在 0.1、0.2、0.5、1、2、2.5 和 3 A g-1 的条件下分别为 2237.7、2132.5、1997.9、1840.8、1677.3、1534.8 和 1357 mAh g-1）。因此，这项研究为将退役光伏电池板中的回收硅以高附加值的方式重新用于锂离子电池提供了一个可行的选择。

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引用次数: 0

Efficient structural and compositional modulation of vanadium oxides for high-areal-capacity zinc-ion batteries 用于高铝容量锌离子电池的钒氧化物的高效结构和成分调控

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-09-22 DOI: 10.1016/j.jpowsour.2024.235503

Although rechargeable aqueous zinc-ion batteries (RAZIBs) have been revitalized as competitive candidates for large-scale energy storage, the development of this technology is stalled by the underutilization of cathode materials due to sluggish reaction kinetics, resulting in low areal capacities that cannot meet the practical requirements. Herein, this study reveals a simple, efficient, and low-energy synthetic route to effectively convert relatively inactive α-V₂O₅ (131 mAh g⁻¹ at 0.1 A g⁻¹) into highly active M_xV₈O₂₀·nH₂O (MVO, M = Li, Na, and K) by liquid-phase dissolution-recrystallization reaction and chemical preintercalation under low-temperature conditions. Particularly, NaVO presents the most expansive diffusion channel, the highest specific surface area, and the smallest band gap, allowing faster electron/ion transport kinetics and better material utilization. With these features, NaVO accommodates electrolyte Zn²⁺ and H⁺ with good reversibility, showing high capacity (383 mAh g⁻¹ at 0.1 A g⁻¹) and rate-performance (207 mAh g⁻¹ at 8 A g⁻¹). More importantly, high-areal-capacity of 3.2 mAh cm⁻² and remarkable cycle stability over 1500 cycles can be achieved from free-standing high-mass-loading electrode (∼14 mg cm⁻²) made of NaVO and multi-walled carbon nanotubes (MWCNTs). This work enriches the synthetic methods for obtaining high-performance vanadium-based host materials with practical areal capacity and cycle stability.

尽管可充电水性锌离子电池（RAZIBs）作为大规模储能的竞争候选技术已焕发出新的活力，但由于反应动力学缓慢导致正极材料利用率低，从而导致容量低，无法满足实际要求，该技术的发展停滞不前。在此，本研究揭示了一种简单、高效、低能耗的合成路线，在低温条件下通过液相溶解-重结晶反应和化学预插层，有效地将相对无活性的 α-V2O5 （0.1 A g-1 时为 131 mAh g-1）转化为高活性的 MxV8O20-nH2O （MVO，M = Li、Na 和 K）。其中，NaVO 具有最宽广的扩散通道、最大的比表面积和最小的带隙，因此电子/离子传输动力学速度更快，材料利用率更高。凭借这些特点，NaVO 能以良好的可逆性容纳电解质 Zn2+ 和 H+，显示出较高的容量（0.1 A g-1 时为 383 mAh g-1）和速率性能（8 A g-1 时为 207 mAh g-1）。更重要的是，由 NaVO 和多壁碳纳米管（MWCNTs）制成的独立式高载荷电极（∼14 mg cm-2）可实现 3.2 mAh cm-2 的高额定容量和超过 1500 次循环的显著稳定性。这项工作丰富了获得具有实用容量和循环稳定性的高性能钒基主材料的合成方法。

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引用次数: 0