Author:
Kim Jaeram,Kwak Sehyun,Pham Hieu Quang,Jo Hyuntak,Jeon Do-Man,Yang A-Reum,Song Seung-Wan
Abstract
Utilization of high-voltage electrolyte additive(s) at a small fraction is a cost-effective strategy for a good solid electrolyte interphase (SEI) formation and performance improvement of a lithium-rich layered oxide-based high-energy lithium-ion cell by avoiding the occurrence of metal-dissolution that is one of the failure modes. To mitigate metal-dissolution, we explored fluorinated dual-additives of fluoroethylene carbonate (FEC) and di(2,2,2-trifluoroethyl)carbonate (DFDEC) for building-up of a good SEI in a 4.7 V full-cell that consists of high-capacity silicon-graphite composite (15 wt% Si/C/CF/C-graphite) anode and Li1.13Mn0.463Ni0.203Co0.203O2 (LMNC) cathode. The full-cell including optimum fractions of dual-additives shows increased capacity to 228 mAhg−1 at 0.2C and improved performance from the one in the base electrolyte. Surface analysis results find that the SEI stabilization of LMNC cathode induced by dual-additives leads to a suppression of soluble Mn2+-O formation at cathode surface, mitigating metal-dissolution event and crack formation as well as structural degradation. The SEI and structure of Si/C/CF/C-graphite anode is also stabilized by the effects of dual-additives, contributing to performance improvement. The data give insight into a basic understanding of cathode-electrolyte and anode-electrolyte interfacial processes and cathode-anode interaction that are critical factors affecting full-cell performance.
Funder
Ministry of Trade, Industry and Energy
National Research Foundation of Korea
Ministry of Science and ICT
Chungnam National University
Publisher
The Korean Electrochemical Society - English Journal
Cited by
5 articles.
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