期刊
ADVANCED MATERIALS
卷 32, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906070
关键词
composite nanostructure; grain surface; Li‐ rich layered oxides; LiTaO; (3) layer; lithium ion batteries; spinel interlayer structure
类别
资金
- Beijing Natural Science Foundation [JQ19003, KZ201910005002, L182009]
- National Natural Science Foundation of China [51622202, U1507107, 21603009, 21875007]
- (National Basic Research Program of China (973 Program)) National Key R&D Program of China [2018YFB0104302]
- Project of Youth Talent Plan of Beijing Municipal Education Commission [CITTCD201804013]
Li-rich layered oxides (LLOs) are fascinating high-energy cathodes for lithium-ion batteries (LIBs), but still suffer from critical drawbacks that retard their practical applications. Although surface modification is effective to protect LLOs from structural deterioration, the delicate design of structures on a grain surface with promising scalability for industrial application is still challenging. Herein, using the atomic layer deposition (ALD) technique, a composite nanostructure comprising a uniform LiTaO3 coating layer (approximate to 3 nm) and a spinel interlayer structure (approximate to 1 nm) is constructed on the grain surface of industrial LLO (Li1.13Mn0.517Ni0.256Co0.097O2) agglomerated spheres. The surface composite nanostructure can not only enhance the structural/interfacial stability of the LLO, but also facilitates Li+ diffusion, thereby significantly improving its cycle stability, rate performance, thermal stability, and voltage maintenance. Specifically, the LLO coated with 10 ALD cycles exhibits a small voltage decay rate of 0.9 mV per cycle, a reversible capacity of 272.8 mAh g(-1) at 0.1 C, and a capacity retention of 85% after 200 cycles at 1 C, suggesting the important role of surface composite nanostructure for improving the electrochemical performance. This work provides new insights into the composite nanostructure design on the grain surface of cathode materials for high-performance LIBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据