Cracks Formation in Lithium-Rich Cathode Materials for Lithium-Ion Batteries during the Electrochemical Process

Tao Cheng, Zhongtao Ma, Run Gu, Riming Chen, Yingchun Lyu, Anmin Nie and Bingkun Guo
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Tao Cheng: Materials Genome Institute, Shanghai University, Shanghai 200444, China
Zhongtao Ma: Materials Genome Institute, Shanghai University, Shanghai 200444, China
Run Gu: Materials Genome Institute, Shanghai University, Shanghai 200444, China
Riming Chen: Materials Genome Institute, Shanghai University, Shanghai 200444, China
Yingchun Lyu: Materials Genome Institute, Shanghai University, Shanghai 200444, China
Anmin Nie: Materials Genome Institute, Shanghai University, Shanghai 200444, China
Bingkun Guo: Materials Genome Institute, Shanghai University, Shanghai 200444, China

Energies, 2018, vol. 11, issue 10, 1-10

Abstract: The lithium-rich Li[Li 0.2 Ni 0.13 Mn 0.54 Co 0.13 ]O 2 nanoplates were synthesized using a molten-salt method. The nanoplates showed an initial reversible discharge capacity of 233 mA·h·g −1 , with a fast capacity decay. The morphology and micro-structural change, after different cycles, were studied by a scanning electron microscope (SEM) and transmission electron microscopy (TEM) to understand the mechanism of the capacity decay. Our results showed that the cracks generated from both the particle surface and the inner, and increased with long-term cycling at 0.1 C rate (C = 250 mA·g −1 ), together with the layered to spinel and rock-salt phase transitions. These results show that the cracks and phase transitions could be responsible for the capacity decay. The results will help us to understand capacity decay mechanisms, and to guide our future work to improve the electrochemical performance of lithium-rich cathode materials.

Keywords: lithium-ion batteries; cathode; li-rich layered materials; capacity decay; crack (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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