期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 21, 期 10, 页码 3037-3046出版社
SPRINGER
DOI: 10.1007/s10008-017-3643-y
关键词
Lithium ion battery; LiNi0.8Co0.15Al0.05O2; Ternary oxide precursor; Solid-state reaction
资金
- National Natural Science Foundation of China [51364021]
- Natural Science Foundation of Yunnan Province [2014FA025]
A Ni-Co-Al ternary oxide precursor with a trigonal structure, which can be used to synthesize LiNi0.8Co0.15Al0.05O2 cathode material, was prepared by calcining Ni-Co-Al composite oxalates formed by using a facile chemical approach. The LiNi0.8Co0.15Al0.05O2 cathode material calcined at a temperature as low as 650 A degrees C had acceptable electrochemical performance with an initial discharge capacity of 183.9 mAh g(-1). The sample prepared at 750 A degrees C possessed the highest initial discharge capacity of 196.0 mAh g(-1), while the sample calcined at 700 A degrees C showed the optimal capacity retention (89.9%) after 100 cycles under 1 C. To prepare a pure LiNi0.8Co0.15Al0.05O2 phase by a conventional solid-state reaction, the calcination temperature should exceed 750 A degrees C, and the highest initial discharge capacity was only 185.4 mAh g(-1). We suggest that the ternary oxide precursor with trigonal structure accelerates lithiation and, therefore, promotes the generation of LiNi0.8Co0.15Al0.05O2 with high crystallinity at a lower temperature. This study provides a facile way to synthesize layered cathode material with good electrochemical performance at a lower calcination temperature.
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