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Corresponding Author

MA Hong-yu(hongyunma@126.com)

Abstract

Nickel-rich layered material has been considered as the most promising one for lithium ion batteries due to its high specific capacity. To further improve the lifetime performance, it is significant to investigate the degradation mechanisms deeply. In this study, the degradation mechanism of NCM811 (LiNi0.83Co0.12Mn0.05O2) being cycled at 45oC was systematically researched. Electrochemical impedance spectrum (EIS) results showed that the SEI resistance (RSEI) and charge transfer resistance (Rct) went up to 83.41% and 211.34% before and after the NCM811 material being cycled at 45oC, respectively. The main factors that influenced the RSEI and Rct were analyzed by means of XPS, TEM, XRD and XANES. The increase of RSEI was mainly ascribed to the conversion of some organic components to inorganic components such as lithium carbonate. Besides, the thickness of SEI film increased due to the side product of lithium fluoride (LiF) accumulated around the active materials. The increase of Rct was ascribed to the destruction of crystal structure, the phase transformations from R-3m to Fd-3m and to Fm-3m, and the micro-cracks appeared inside of the active particles. In addition, the solid mass transfer resistance (Rw) was found to become larger, which was mainly affected by the enhanced Li/Ni mixing and dissolutions of transition metal elements.

Graphical Abstract

Keywords

LiNi0.83Co0.12Mn0.05O2, 45 °C cycle degradation, electrochemical impedance spectrum, solid electrolyte interphase, charge transfer resistance

Publication Date

2020-06-28

Online Available Date

2019-04-09

Revised Date

2019-03-29

Received Date

2019-01-23

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