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Energies 2018, 11(10), 2712; https://doi.org/10.3390/en11102712

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

1
Materials Genome Institute, Shanghai University, Shanghai 200444, China
2
State Key Lab of Metastable Materials Science & Technology and Key Laboratory for Microstructure Material Physics of Hebei Province, Yanshan University, Qinhuangdao 066004, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 21 September 2018 / Revised: 5 October 2018 / Accepted: 8 October 2018 / Published: 11 October 2018
(This article belongs to the Special Issue Electrochemical Energy Conversion and Storage Technologies)
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Abstract

The lithium-rich Li[Li0.2Ni0.13Mn0.54Co0.13]O2 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. View Full-Text
Keywords: lithium-ion batteries; cathode; li-rich layered materials; capacity decay; crack lithium-ion batteries; cathode; li-rich layered materials; capacity decay; crack
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Cheng, T.; Ma, Z.; Gu, R.; Chen, R.; Lyu, Y.; Nie, A.; Guo, B. Cracks Formation in Lithium-Rich Cathode Materials for Lithium-Ion Batteries during the Electrochemical Process. Energies 2018, 11, 2712.

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