阴极
纳米复合材料
电化学
阳极
锂(药物)
氧化还原
材料科学
化学工程
石墨
单排替反应
复合数
纳米技术
电极
化学
无机化学
物理化学
复合材料
冶金
医学
内分泌学
工程类
作者
Lulu Tan,Anran Li,Yusi Yang,Jianwen Zhang,Xiaogang Niu,Nan Li,Limin Liu,Lin Guo,Yujie Zhu
标识
DOI:10.1002/anie.202206012
摘要
The high activation barrier, inferior rate performance, and short cycling life severely constrain the practical applications of the high-capacity Li2 S cathode. Herein, we fabricate a Li2 S-Cu nanocomposite with a drastically reduced activation potential, fast rate capability, and extraordinary cycling stability even under a practically relevant areal capacity of 2.96 mAh cm-2 . Detailed experimental investigations aided by theoretical calculations indicate that instead of converting to S8 via troublesome soluble lithium polysulfides, Li2 S is thermodynamically and kinetically more favorable to react with Cu by the displacement reaction, which alters the redox couple from Li2 S/S to Cu/Cu2 S, leading to the excellent electrochemical performance. Moreover, the stability of the composite is demonstrated in the full-cell configuration consisting of commercial graphite anodes. This work provides an innovative and effective approach to realize highly activated and stable Li2 S cathode materials.
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