Surface Design with Cation and Anion Dual Gradient Stabilizes High-Voltage LiCoO_2

Huang Weiyuan; Zhao Qi; Zhang MingjianXu ShenyangXue HaoyuZhu ChenFang JianjunZhao WenguangRen GuoxiQin RunzhiZhao QingheChen HaibiaoPan Feng

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Surface Design with Cation and Anion Dual Gradient Stabilizes High-Voltage LiCoO_2

机译：Surface Design with Cation and Anion Dual Gradient Stabilizes High-Voltage LiCoO_2

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LiCoO2 (LCO) is the most successful cathode material for commercial lithium-ion batteries. Cycling LCO to high potentials up to 4.5 V or even 4.6 V can significantly elevate the capacity but cause structural degradation due to the serious surface side reaction between the highly oxidized Co4+ and O- species with organic electrolytes. To tackle this concern, a new strategy, constructing cation and anion dual gradients at the surface of LCO (DG-LCO), is proposed. Specifically, the electrochemically inactive cation and anion are selected to substitute Co3+ and O2- at the surface in a gradated manner, thus minimizing the highly oxidized Co4+ and O- species at high potentials and suppressing the induced surface side reactions. Unexpectedly, this dual gradient design leads to a spinel-like surface structure coherently with bulk layered structure, which facilitates Li+ diffusion kinetics. Thus, DG-LCO achieves high capacity and excellent cycling stability at 4.6 V (approximate to 216 mA h g(-1) at 0.1 C, a capacity retention of 88.6% after 100 cycles in 1.8 A h pouch full cell at 1 C), as well as improved rate capability (approximate to 140 mA h g(-1) at 5 C). These studies provide useful guidelines for future design of cathode materials with long lifespan and high rate capability.

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来源
《Advanced energy materials》 |2022年第20期|2200813.1-2200813.10|共10页
作者
Huang Weiyuan; Zhao Qi; Zhang MingjianXu ShenyangXue HaoyuZhu ChenFang JianjunZhao WenguangRen GuoxiQin RunzhiZhao QingheChen HaibiaoPan Feng;
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作者单位

Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China;

Chinese Acad Sci, State Key Lab Funct Mat Informat, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China;

Shenzhen Polytech, Inst Marine Biomed, Shenzhen 518055, Peoples R China;

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正文语种英语
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dual gradient; high voltage; LiCoO; (2) cathodes; lithium-ion batteries; stable surface structure;

Surface Design with Cation and Anion Dual Gradient Stabilizes High-Voltage LiCoO_2

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