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题名: Mitigating Voltage Decay of Li-Rich Cathode Material via Increasing Ni Content for Lithium-Ion Batteries
作者: Shi, Ji-Lei1, 3; Zhang, Jie-Nan2; He, Min2; Zhang, Xu-Dong1, 3; Yin, Ya-Xia1; Li, Hong2; Guo, Yu-Guo1, 3; Gu, Lin2; Wan, Li-Jun1, 3
关键词: lithium batteries ; cathode materials ; high-capacity ; Li-rich ; voltage decay
刊名: ACS APPLIED MATERIALS & INTERFACES
发表日期: 2016-08-10
卷: 8, 期:31, 页:20139-20147
收录类别: SCI
英文摘要: Li-rich layered materials have been considered as the most promising cathode materials for future high-energy-density lithium-ion batteries. However, they suffer from severe voltage decay upon cycling, which hinders their further commercialization. Here, we report a Li-rich layered material 0.5Li(2)MnO(3)center dot 0.5LiNi(0.8)-Co0.1Mn0.1O2 with high nickel content, which exhibits much slower voltage decay during long-term cycling compared to conventional Li-rich materials. The voltage decay after 200 cycles is 201 mV. Combining in situ X-ray diffraction (XRD), ex situ XRD, ex situ Xray photoelectron spectroscopy, and scanning transmission electron microscopy, we demonstrate that nickel ions act as stabilizing ions to inhibit the Jahnn-Teller effect of active Mn3+ ions, improving d-p hybridization and supporting the layered structure as a pillar. In addition, nickel ions can migrate between the transition-metal layer and the interlayer, thus avoiding the formation of spinel-like structures and consequently mitigating the voltage decay. Our results provide a simple and effective avenue for developing Li-rich layered materials with mitigated voltage decay and a long lifespan, thereby promoting their further application in lithium-ion batteries with high energy density.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35276
Appears in Collections:分子纳米结构与纳米技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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