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Journal of Central South University

, Volume 24, Issue 5, pp 1013–1018 | Cite as

LiPF6 and lithium difluoro(oxalato)borate/ethylene carbonate+dimethyl carbonate +ethyl(methyl)carbonate electrolyte for LiNi0.5Mn1.5O4 cathode

  • Hong-ming Zhou (周宏明)
  • Wen-jun Geng (耿文俊)
  • Jian Li (李荐)
Article

Abstract

LiODFB electrolyte’s compatibility with LiNi0.5Mn1.5O4 high-voltage cathode material was studied by cyclic voltammetry, charge-discharge test and AC impedance. The results show that at 25 and 60 °C, the LiODFB-based electrolyte has better electrochemical stability than LiPF6. AC impedance plots show that the LiODFB battery has a lower charge-transfer resistance than LiPF6 battery at 60 °C, which indicates that LiODFB battery has excellent cycling performance at high temperature. At 25 and 60 °C, the LiNi0.5Mn1.5O4/Li half cells with LiODFB or LiPF6 as electrolyte all have simple redox peak, showing that each of them has an excellent reversibility. LiODFB battery has better cycle performance than LiPF6 battery at 25 °C and 60 °C. At 25 °C, their 0.5C initial discharge specific capacities are 126.3 and 131.6 mA·h/g, and their capacity retention ratios of the 100th cycle are 97.1% and 94.7%, respectively. At 60 °C, their 0.5C initial discharge specific capacities are 132.6 and 129.1 mA·h/g, and their capacity retention ratios of the 100th cycle are 94.1% and 81.7%, respectively.

Key words

lithium difluoro(oxalato)borate LiNi0.5Mn1.5O4 electrochemical performance compatibility 

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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Hong-ming Zhou (周宏明)
    • 1
    • 2
  • Wen-jun Geng (耿文俊)
    • 1
  • Jian Li (李荐)
    • 1
    • 2
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina
  2. 2.Hunan Province Zhengyuan Energy Storage Materials and Devices ResearchChangshaChina

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