Abstract
As the earliest commercial cathode material for lithium-ion batteries, lithium cobalt oxide (LiCoO2) shows various advantages, including high theoretical capacity, excellent rate capability, compressed electrode density, etc. Until now, it still plays an important role in the lithium-ion battery market. Due to these advantages, further increasing the charging cutoff voltage of LiCoO2 to guarantee higher energy density is an irresistible development trend of LiCoO2 cathode materials in the future. However, using high charging cutoff voltage may induce a lot of negative effects, especially the rapid decay of cycle capacity. These are mainly caused by rapid destruction of crystal structure and aggravation of interface side reaction at high voltage during the cycle. Therefore, how to maintain a stable crystal structure of LiCoO2 to ensure the excellent long cycle performance at high voltage is a hot research issue in the further application of LiCoO2. In this review, we summarized the failure causes and extensive solutions of LiCoO2 at high voltage and promoted some new modification strategies. Moreover, the development trend of solving the failure problem of high-voltage LiCoO2 in the future such as defect engineering and high-temperature shock technique is also discussed.
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摘要
钴酸锂 (LiCoO2) 作为最早商业化的锂离子电池正极材料, 具有理论容量高, 倍率性能好, 压实密度高等优点. 至今, 在锂离子电池市场上仍占有重要地位. 基于上述优点, 进一步提高LiCoO2的充电截止电压以保证更高的能量密度是未来LiCoO2正极材料不可阻挡的发展趋势. 然而, 使用高充电截止电压可能会引发较多负面影响, 尤其是循环过程中容量的快速衰减. 这主要是由循环过程中晶体结构的快速破坏和高压下界面副反应的加剧所导致. 因此, 如何保持高电压下LiCoO2稳定的晶体结构, 确保其在高电压下具有优异的长周期性能, 是LiCoO2进一步应用的研究热点. 本综述中, 我们总结了LiCoO2在高电压下失效的原因和常用的解决方案, 并提出了一些新的改进策略. 此外, 我们还讨论了今后解决LiCoO2在高电压下失效问题的发展方向, 比如利用缺陷工程和高温热冲击技术.
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This study was financially supported by the National Natural Science Foundation of China (Nos. 52171219 and 91963113).
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Zhang, JC., Liu, ZD., Zeng, CH. et al. High-voltage LiCoO2 cathodes for high-energy-density lithium-ion battery. Rare Met. 41, 3946–3956 (2022). https://doi.org/10.1007/s12598-022-02070-6
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DOI: https://doi.org/10.1007/s12598-022-02070-6