期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 5, 页码 6302-6312出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00658
关键词
lithium-ion battery; cathode materials; Ni-rich layered oxides; single-crystal structure design; lithium storage property
资金
- National Natural Science Foundation of China [51904135, 52162030, 51804149]
- Scientific Research Fund of Yunnan Provincial Department of Science and Technology [2019FB076, 2018FD039]
- Sichuan Science and Technology Program [2019YFG0527]
- Scientific Research Fund of Yunnan Provincial Department of Education [2019J0032]
In this study, Ni0.8C0.1Mn0.1(OH) precursors with hexagonal morphology were synthesized via a hydrothermal method, leading to the successful preparation of highly crystalline micrometer Ni-rich single-crystal LiNi0.8Co0.1Mn0.1O2 cathode materials with excellent dispersion at relatively lower calcination temperature and excess lithium ratio. These single-crystal cathode materials exhibited better initial capacity and excellent capacity retention compared to traditional commercial Ni-rich polycrystalline cathodes, showing promising potential for high-performance Li-storage structures.
The disordered volume effect of anisotropic primary particles during electrochemical processes is a key problem in the electrochemical instability of LiNiO2-based cathode materials. In this work, Ni0.8C0.1Mn0.1(OH) precursors with a hexagonal morphology were synthesized via a hydrothermal method. Highly crystalline micrometer Ni-rich single-crystal LiNi0.8Co0.1Mn0.1O2 cathode materials with excellent dispersion were successfully prepared at a relatively lower calcination temperature and excess lithium ratio than those of conventional methods. When compared to traditional commercial Ni-rich polycrystalline cathodes, these single-crystal cathode materials had a better initial capacity of 186.2 mAh g(-1) and an excellent capacity retention of similar to 93.4% (2.8-4.3 V) after 100 cycles at 1 C. Moreover, monodispersed, micrometer- and submicrometer-sized Li-storage architectures shortened the Lit-diffusion distance and provided upgraded rate performance, achieving a capacity of 130.4 mAh g(-1 )at a rate of 10 C. Thus, the hydrothermal construction of a single-crystal precursor-assisted mild sintering strategy was effective for designing single-crystal Ni-rich Li-storage structures with good electrochemical properties.
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