Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Effect of Fluoroethylene Carbonate in the Electrolyte for LiNi0.5Mn1.5O4 Cathode in Lithium-ion Batteries

  • Kim, Jaemin (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Go, Nakgyu (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Kang, Hyunchul (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Tron, Artur (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Mun, Junyoung (Department of Energy and Chemical Engineering, Incheon National University)
  • Received : 2016.11.14
  • Accepted : 2017.01.16
  • Published : 2017.03.31
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Abstract

Fluoroethylene carbonate (FEC) was studied as an additive for the electrolyte in lithium ion batteries with the $LiNi_{0.5}Mn_{1.5}O_4$ (LNMO) spinel cathode operating at a high potential beyond 4.7 V (vs. $Li/Li^+$). It was found that the FEC additive was electrochemically active for the $1^{st}$ charge cycle on the LNMO cathode. The presence of a large amount of FEC (more than 40 vol%) in the electrolyte caused severe side reactions with abnormally long voltage plateaus. In contrast, when the electrolyte contained less than 30 vol% FEC, the surface of the LNMO cathode was stabilized by the formation of the solid-electrolyte interphase (SEI), leading to improved cyclability. However, the resistance from the SEI limited the rate capability because of sluggish lithium transportation through the SEI and electronic insulation between the particles in the electrode.

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