期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 31, 页码 20138-20146出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06733
关键词
lithium batteries; cathode materials; high-capacity; Li-rich; voltage decay
资金
- Ministry of Science and Technology of the People's Republic of China [2016YFA0202500, 2012CB932900]
- National Natural Science Foundation of China [51225204, 21303222, 21127901]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010000]
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.
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