Journal
ADVANCED MATERIALS
Volume 32, Issue 49, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906070
Keywords
composite nanostructure; grain surface; Li‐ rich layered oxides; LiTaO; (3) layer; lithium ion batteries; spinel interlayer structure
Categories
Funding
- 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]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available