The active lithium ions loss during the initial charge and discharge process of lithium ion batteries seriously hampers its increasement of energy density. Pre-lithiation, involving the pre-storage of active lithium ions prior to cycling, emerges as a promising and effective strategy to offset this loss. LiCoO has been identified as a candidate capable of releasing adequate lithium ions to compensate for such loss. However, its poor air stability renders it susceptible to side reactions in the atmosphere, leading to the formation of residual lithium and consequently affecting its electrochemical performance. In this study, we propose application of a lithium aluminate (LiAlO) coated onto the surface of lithium cobalt oxide (LiCoO) to mitigate the presence of residual lithium. Meanwhile, with decreasing of residual lithium, the rate capability is also enhanced. The research results demonstrate that samples treated with this coating layer exhibit an enhanced energy density in the full cell, indicating the efficacy of this approach in optimizing the electrochemical performance of prelithiation additives.

中文翻译：

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锂离子电池预锂化正极添加剂表面包覆工程

锂离子电池在初次充放电过程中活性锂离子的损失严重阻碍了其能量密度的提高。预锂化涉及在循环之前预存储活性锂离子，是抵消这种损失的一种有前途且有效的策略。 LiCoO已被确定为能够释放足够锂离子以补偿这种损失的候选材料。然而，其空气稳定性较差，容易在大气中发生副反应，导致残留锂的形成，从而影响其电化学性能。在这项研究中，我们建议在钴酸锂 (LiCoO) 表面涂覆铝酸锂 (LiAlO)，以减少残留锂的存在。同时，随着残锂的减少，倍率性能也随之增强。研究结果表明，用该涂层处理的样品在全电池中表现出增强的能量密度，表明该方法在优化预锂化添加剂的电化学性能方面的功效。