兴奋剂
煅烧
锂(药物)
阴极
电化学
材料科学
涂层
锡
电极
石墨
离子
化学工程
二氧化锡
电池(电)
纳米技术
光电子学
化学
催化作用
冶金
物理化学
有机化学
生物化学
量子力学
医学
功率(物理)
内分泌学
工程类
物理
作者
Miaomiao Gong,Yukun Fu,Wenli Yao,Xianfa Rao,Qian Zhang,Shengwen Zhong,Qiangchao Sun,Hongwei Cheng
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2023-01-20
卷期号:6 (3): 1248-1258
被引量:4
标识
DOI:10.1021/acsaem.2c02928
摘要
Layered oxides with high nickel content are advanced cathode materials for high-energy-density lithium-ion batteries but still suffer from severe voltage decay and cycling instability. Herein, a nano-Li2SnO3 coating and Sn4+-doping co-stabilized Co-free LiNi0.8Mn0.2O2 (NM-82) cathodes were synthesized through the adsorption of tin dioxide sol, followed by high-temperature calcination. Profiting from co-benefits, the electrochemical reversibility and rate capability of the NM-82 electrode have been significantly improved. Herein, the NM-82 electrode modified with 2 wt % Li2SnO3 (NM@Sn-2) achieves the largest specific capacity with remarkable capacity retention. The enhanced cycle stability is also revealed in the graphite/NM@Sn-2 soft pack battery, which features a reversible capacity of 173.20 mA h g–1 and a high capacity retention of 90.54%, outperforming those of the NM-82 cathode (154.09 mA h g–1 and 81.23%) at 0.2 C after 300 cycles. The improved performance of the NM@Sn-2 cathode originates from its stronger structure, lower Li/Ni cation mixing degree, and faster Li+ kinetics, also verified by theoretical calculations. Therefore, the one-step construction of nano-Li2SnO3 coating coupling with Sn4+ doping strategy shows a promising strategy to mitigate the capacity deterioration of the Co-free Ni-rich layered oxides.
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