材料科学
阴极
润湿
溶解
外延
电解质
图层(电子)
化学物理
化学工程
纳米技术
复合材料
化学
物理化学
电极
工程类
作者
Xiulin Zhu,Tobias U. Schülli,Xiaowei Yang,Tongen Lin,Yuxiang Hu,Ningyan Cheng,Hiroki Fujii,Kiyoshi Ozawa,Bruce C. C. Cowie,Qinfen Gu,Jijun Zhao,Zhenxiang Cheng,Yi Du,Luyao Wang
标识
DOI:10.1038/s41467-022-28963-9
摘要
Transition metal dissolution in cathode active material for Li-based batteries is a critical aspect that limits the cycle life of these devices. Although several approaches have been proposed to tackle this issue, this detrimental process is not yet overcome. Here, benefitting from the knowledge developed in the semiconductor research field, we apply an epitaxial method to construct an atomic wetting layer of LaTMO3 (TM = Ni, Mn) on a LiNi0.5Mn1.5O4 cathode material. Experimental measurements and theoretical analyses confirm a Stranski-Krastanov growth, where the strained wetting layer forms under thermodynamic equilibrium, and it is self-limited to monoatomic thickness due to the competition between the surface energy and the elastic energy. Being atomically thin and crystallographically connected to the spinel host lattices, the LaTMO3 wetting layer offers long-term suppression of the transition metal dissolution from the cathode without impacting its dynamics. As a result, the epitaxially-engineered cathode material enables improved cycling stability (a capacity retention of about 77% after 1000 cycles at 290 mA g-1) when tested in combination with a graphitic carbon anode and a LiPF6-based non-aqueous electrolyte solution.
科研通智能强力驱动
Strongly Powered by AbleSci AI