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Searching for the ideal Li1+xTMO2 cathode for anode-free Li metal batteries
Energy Storage Materials ( IF 18.9 ) Pub Date : 2024-12-10 , DOI: 10.1016/j.ensm.2024.103956
Tingting Xu, Kun Qin, Chunxi Tian, Liangdong Lin, Weiping Li, Liumin Suo

Anode-free lithium metal batteries push the energy density higher and minimize battery production costs as low as possible. However, the fast capacity decay impedes their commercial viability, primarily due to the lack of excessive Li from the anode to compensate for the irreversible lithium loss. Thus, the Li-rich NCM cathode is a feasible way to solve the issue. In this work, to search for the ideal Li1+xTMO2 cathode for anode-free Li metal batteries, we selected the two types of commonly used layered cathode materials (LiTMO2: NCM622 and NCM811) to enrich Li converting into Li2TMO2 by both chemical lithiation (C-Li) and electrochemical lithiation (E-Li) methods. Our findings show that the Li-rich NCM622 lithiated by the E-Li method is an ideal choice among our candidates, which has a high lithiation degree that almost covers the entire reversible transition range from Li1 to Li2 without additional by-products and a negative impact on kinetic performance. Based on the above results, we further demonstrated that the Li1.33NCM622|Cu pouch cell presents a longer cycle life of >200 times with a high capacity retention of 74 %.

中文翻译:


寻找用于无阳极锂金属电池的理想 Li1+xTMO2 阴极



无阳极锂金属电池提高了能量密度,并尽可能降低电池生产成本。然而,快速的容量衰减阻碍了它们的商业可行性,主要是由于阳极缺乏过量的锂来补偿不可逆的锂损失。因此,富锂 NCM 阴极是解决这个问题的可行方法。在这项工作中,为了寻找无负极锂金属电池的理想 Li1+xTMO2 正极,我们选择了两种常用的层状正极材料 (LiTMO2: NCM622 和 NCM811),通过化学锂化 (C-Li) 和电化学锂化 (E-Li) 方法富集锂转化为 Li2TMO2。我们的研究结果表明,通过 E-Li 方法锂化的富锂 NCM622 是我们的候选者中的理想选择,它具有很高的锂化程度,几乎覆盖了从 Li1 到 Li2 的整个可逆转变范围,没有额外的副产物,对动力学性能产生负面影响。基于上述结果,我们进一步证明了 Li1.33NCM622|Cu 软包电池具有更长的循环寿命 >200 次,容量保持率高达 74%。
更新日期:2024-12-10
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