Fundamental Investigation of Direct Cathode Regeneration Using Chemically Delithiated Lithium Cobalt Oxides
Fundamental Investigation of Direct Cathode Regeneration Using Chemically Delithiated Lithium Cobalt Oxides
复制标题
使用化学脱锂钴酸锂直接阴极再生的基础研究
DOI：
10.1149/1945-7111/ac9d68
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发表时间：
2022
影响因子：
3.9
通讯作者：
Shin, Hosop
中科院分区：
文献类型：
--
作者：
Bhuyan, Md. Sajibul;Shin, Hosop
从报废（EOL）锂离子电池中回收有价值的阴极材料，可以帮助减少对生产阴极原材料开采的依赖，同时防止商品价格上涨。该研究采用了类似于废阴极但不含杂质的化学脱锂阴极，以从根本上阐明阴极再生的有效性。采用化学脱锂法合成了两种不同脱锂程度的锂钴氧化物。系统地比较了它们在水热阴极再生前后的材料和电化学特性。进一步评估材料和电化学特性，并与原始LCO的材料和电化学特性进行比较。在高和低健康状态（SOH）下，两种LCO都恢复了与原始LCO相当的可逆容量和循环性能。然而，再生LCO的高倍率性能（2C）与原始LCO的高倍率性能（2C）不可比。再生LCO的电池电阻的轻微增加归因于其较低的高倍率性能，这被认为是阴极再生的关键挑战。我们的研究提供了有价值的见解阴极再生的有效性，阐明了在不同水平的SOH的无序锂缺乏LCO的再生的过程。
Reusing valuable cathode materials from end-of-life (EOL) Li-ion batteries can help decrease dependence on mining of raw materials for producing cathodes, while preventing commodity prices from rising. This study employed chemically delithiated cathodes that are analogous to spent cathodes but free of impurities to fundamentally elucidate the effectiveness of cathode regeneration. Two lithium cobalt oxides (LCOs) at different degrees of delithiation were synthesized via chemical delithiation. Their material and electrochemical characteristics were systematically compared before and after hydrothermal-based cathode regeneration. The material and electrochemical characteristics were further evaluated and compared with those of pristine LCO. Both LCOs, at high and low states of health (SOH), recovered their reversible capacity and cycle performance comparable to those of pristine LCO. However, the high-rate performance (2C) of the regenerated LCOs was not comparable to that of pristine LCO. The slight increase in cell resistance of the regenerated LCOs was attributed to their lower high-rate performance, which was identified as a key challenge of cathode regeneration. Our study provides valuable insights into the effectiveness of cathode regeneration by elucidating the process underlying regeneration of disordered Li-deficient LCOs at different levels of SOH.