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High-rate cycling performance and surface analysis of LiNi1-xCox/2Mnx/2O2 (x=2/3, 0.4, 0.2) cathode materials
- High-rate cycling performance and surface analysis of LiNi1-xCox/2Mnx/2O2 (x=2/3, 0.4, 0.2) cathode materials
- Oh, Jimin; Kim, Jumi; Lee, Yong Min; Shin, Dong Ok; Kim, Ju Young; Lee, Young-Gi; Kim, Kwang Man
- DGIST Authors
- Lee, Yong Min
- Issue Date
- Materials Chemistry and Physics, 222, 1-10
- Article Type
- Author Keywords
- Nickel-based layered materials; Electrochemical performance; Solid electrolyte interface; X-ray photoelectron spectroscopy
- LITHIUM-ION BATTERIES; SOLID-ELECTROLYTE INTERPHASE; ELECTROCHEMICAL PERFORMANCE; INTERFACE COMPOSITION; VINYLENE CARBONATE; OXYGEN RELEASE; LI; NI; CHEMISTRY; CELLS
- The electrochemical performance of layered LiNi1-xCox/2Mnx/2O2 cathode materials (x = 2/3, 0.4, 0.2; so-called NCM333, NCM622, NCM811) in 1.0 M LiPF6-dissolved conventional carbonate-based electrolyte during formation at a 0.1 C-rate and consequent cycling at a 1.0 C-rate is measured and considered together with the results of morphology observation, impedance spectroscopy, and surface analysis. X-ray photoelectron spectroscopy (XPS) is carried out on the surface of the cathode materials before and after formation and cycling to investigate the effects of solid electrolyte interphase (SEI) formation on the electrochemical performance. As the Ni content increases, the initial specific capacity increases but the capacity retention ratio decreases. High-rate cycling overrides the SEI formation on the NCM surfaces, but NCM622 suffers great changes in the SEI components with a thick layer resulting in large interfacial resistance. It is also proved that NCM811 shows significant dissolution and accumulation of Ni species on the surface, contributing structural degradation and leading to fast capacity fading. © 2018 Elsevier B.V.
- Elsevier Ltd
- Related Researcher
Lee, Yong Min
Battery Materials & Systems LAB
Battery; Electrode; Electrolyte; Separator; Simulation
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- Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles
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