期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 4, 页码 3242-3252出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02008
关键词
LiNi0.8Mn0.1Co0.1O2 cathode; SnO2; Li2SnO3; coating; lithium ion batteries
资金
- National Natural Science Foundation of China [51801153, 21902125, 51672189]
- China Postdoctoral Science Foundation [2019M653705]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JLP-04, 2019JQ-419]
- Doctoral Scientific Research Startup Foundation of Xi'an University of Technology [101-451119016]
LiNi0.8Co0.1Mn0.1O2 (NCM) is a highly prospective cathode material for high energy density Li-ion batteries (LIBs). Nevertheless, poor cycling performance and rate capability at high cutoff voltages have dramatically blocked its further commercialization. In this study, an ionic conductive interface has been demonstrated to enhance the NCM electrochemical property at the high cutoff voltage of 4.5 V on account of the existence of a Li-ion conductor of Li2SnO3. In comparison to SnO2, Li2SnO3 causes a smoother Li-ion diffusion at the engineered interfaces, lower polarization, slower capacity drop, and voltage fading as well as better H2/H3 reversibility upon cycling. Importantly, it is confirmed that excellent diffusion is beneficial to preservation of reversible phase transition and reduction of polarization, which are directly relative to the superior cyclability and rate capability. This work reveals that building an excellent ionic diffusion interface is feasible for Ni-rich cathodes with simultaneous high capacity and stable cyclability.
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