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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Polyimide as a functional binder for Ni-rich cathode of high energy Li-ion batteries

2019년 8월 22일 13시 25분 57초
POLY.P-29 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (금요일) 11:00~12:30
Polymer Chemistry
저자 및
Jeongdong Kim, Hyun Min Jung1,*
Kumoh National Institute of Technology, Korea
1Department of Applied Chemistry, Kumoh National Institute of Technology, Korea
Polyimide has received much attention in the field of electronic materials as a versatile thermo-sable organic material. In this work, the unique combination of nickel-rich NCM811 cathode of Li-ion batteries with functional polyimide binder has been tested to enhanced thermal stability and effective surface passivation in Li-ion batteries, which enables an expansion of electrochemical voltage window to 4.4 V and a flame-resistant cathode. This strategy resolves the issues originating from the interfacial instability of NCM811 cathode coated with conventional binder. As a result, significantly improved cycling stability with higher capacity of than 200 mAh/g is achieved with PI-FTD binder-assisted NCM811 cathode with in commercial liquid electrolyte without any additive. The energy density of 789Wh per kg of cathode active mass delivered by graphite/PI-NCM811 full-cell at 45oC is 1.5 fold higher than 520Wh per kg of graphite/LiCoO2 commercial LIB. The innovative polyimide binder assisted non-flammable Ni-rich NCM811 cathode concept provides a new direction for ultimately commercially available high energy-density and high-safety Li-ion batteries based on high-voltage and/or high-capacity cathodes.