材料科学
纳米结构
复合数
原子层沉积
阴极
粒度
尖晶石
涂层
晶粒生长
热稳定性
复合材料
冶金
纳米技术
化学工程
图层(电子)
化学
物理化学
工程类
作者
Errui Wang,Yang Zhao,Dongdong Xiao,Xu Zhang,Tianhao Wu,Boya Wang,Muhammad Zubair,Yuqiang Li,Xueliang Sun,Haijun Yu
标识
DOI:10.1002/adma.201906070
摘要
Abstract 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 LiTaO 3 coating layer (≈3 nm) and a spinel interlayer structure (≈1 nm) is constructed on the grain surface of industrial LLO (Li 1.13 Mn 0.517 Ni 0.256 Co 0.097 O 2 ) 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.
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