Journal
IONICS
Volume 23, Issue 11, Pages 2993-2999Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-017-2124-8
Keywords
Lithiumion battery; LiNi0.5Mn1.5O4; Cathode; Carbonate; Oxalate
Funding
- Natural Science Foundation of China [21566021, 21406100]
- Foundation for Innovation Groups of Basic Research in Gansu Province [1606RJIA322]
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Effects of two different precipitants of Na2CO3 and Na2C2O4 on LiNi0.5Mn1.5O4 (LNMO) cathode materials, which are prepared by a modified co-precipitation method, have been investigated. Various measurements have been applied to characterize the physical and electrochemical performances of LNMO. Compared with the LNMO prepared by the oxalate co-precipitation (LNMO2), the material synthesized by the carbonate co-precipitation (LNMO1) not only shows more uniform porosity and smaller particles but also has a better rate capability and cycling performance. In addition, the sample prepared by carbonate has a stable spherical structure, due to the fact that carbonate co-precipitation with less gas release during calcination can prevent the destruction of the as-prepared LNMO material structure and promote the formation of regular particle and aperture. Based on the electrochemical test results, LNMO1 shows greatly enhanced electrochemical performance of a high initial discharge capacity of 125.6 mAh g(-1) at 0.25 A degrees C, as well as a preferably capacity retention of 96.5% after 100 cycles at 0.5 A degrees C. And even at a high rate of 10 A degrees C, the discharge capacity of LNMO1-based cell still approaches 83.1 mAh g(-1).
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