Abstract
High-capacity anode materials, such as SiO and Si/C, are considered promising candidates for high-energy-density lithium-ion batteries. However, the low initial Coulombic efficiency of these anode materials induced by side reactions (forming Li2O and lithium silicate) and the formation of solid electrolyte interface film reduces the active Liions and causes low-discharge capacity. Adding a Li-compensation material in the cathode or anode is an effective strategy to overcome this problem. The most used Li-compensation material is the stabilized lithium metal powder. However, this strategy has high safety risks, high costs, and is challenging to quantify. Herein, the Li-compensation material of Li6CoO4 is synthesized and investigated. The preparation conditions, stability in the air, delithiation mechanism, and structural transformation are analyzed and discussed. Electrochemical tests reveal that the discharge capacity and capacity retention of the full pouch cells (3-Ah) with Li6CoO4 additive is significantly improved. Also, the reason for such improvement is investigated. This work provides an effective strategy of Li-compensating technology to enhance the electrochemical performance of lithium-ion batteries.
摘要
SiO和Si/C具有高容量, 被认为是高能量密度锂离子电池有前景的负极材料. 然而, 副反应(形成Li2O和硅酸锂)和固体电解质界面(SEI)膜的形成, 导致这些负极材料初始库仑效率、活性锂离子数量以及放电容量的降低. 在正极或负极中添加补锂材料是解决这一问题的有效方法. 最常用的补锂材料是稳定锂金属粉末(SLMP), 但这种策略存在安全风险高、成本高且难以实现定量补锂的缺点. 本文合成并研究了Li6CoO4锂补偿材料, 分析和讨论了其制备条件、空气中的稳定性、脱锂机制和结构转变机理. 研究结果表明, 添加Li6CoO4能在发挥补锂作用的同时, 显著提高软包全电池(3-Ah)的循环性能. 这项工作提供了一种有效的补锂策略, 是提高锂离子电池电化学性能的有效方法.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2016YFB0100500) and the Young Elite Scientists Sponsorship Program by Tianjin (TJSQNTJ-2017-05)
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Zhang H conceived the idea and designed the experiments Na Z designed and carried out the experiments and wrote the paper. Lai C, Song D, and Shi X analyzed the data and refined the manuscript Zhang L and Zhou J supervised the project All authors contributed to the general discussion.
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Ziyu Na received her bachelor’s degree in 2018. She joined the School of Materials Science and Engineering, Tianjin University of Technology, in 2021 Her current research interests are mainly focused on the Li-compensation material for lithium-ion batteries.
Hongzhou Zhang obtained his PhD degree in Materials Science from Nankai University (China) in 2015. Then, he joined Prof. Lianqi Zhang’s group at Tianjin University of Technology, China. His current research focused on functional materials and their application in energy conversion and storage devices.
Lianqi Zhang is a professor at Tianjin University of Technology, China. He obtained his PhD degree in chemistry from Soga University (Japan) in 2003. His current interest is focused on the applied research in lithium-ion batteries, the structure, and the electrochemical properties of new materials for energy storage and conversion.
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Na, Z., Lai, C., Zhou, J. et al. Enhancing the reversible capacity and cycle stability of lithium-ion batteries with Li-compensation material Li6CoO4. Sci. China Mater. 65, 620–628 (2022). https://doi.org/10.1007/s40843-021-1784-0
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DOI: https://doi.org/10.1007/s40843-021-1784-0