상세정보
학술지
Effects of Vinylene Carbonate and 1,3-propane Sultone on High-rate Cycle Performance and Surface Properties of High-nickel Layered Oxide Cathodes
- 발행일
- 202012
- 출처
- Materials Research Bulletin, v.132, pp.1-10
- ISSN
- 0025-5408
- 출판사
- Elsevier
- 협약과제
- 20PB2800, 전기차 주행거리 연장을 위한 고에너지밀도 (300 Wh/kg) 리튬이차전지용 전해액 상용화기술 개발, 김광만
- 초록
- The high-rate half-cell performance of LiNi0.3Co0.3Mn0.3O2 (NCM333), LiNi0.6Co0.2Mn0.2O2 (NCM622), and LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode materials is investigated with the base electrolyte of LiPF6/ethylene carbonate (EC):ethylmethyl carbonate (EMC) and the additives of vinylene carbonate (VC) and 1,3-propane sultone (PS). The effects of these additives on the cathode surfaces are particularly examined in terms of the reduction products of the electrolyte components and the formation of solid electrolyte interphase (SEI) on cathode surfaces. The cathode SEI appears less after formation for all NCM materials, but it accumulates with repeated charging/discharging at a high rate. Of these, the addition of VC + PS to the base electrolyte sufficiently provides stable cathode SEI with suppressed thickness under cycling at a high rate by inhibiting the further decomposition of reduction products. The synergy of VC + PS may be originated by the combination of vinyl and sulfone functional groups to provide passivation film with cross-linked protective networks on Ni-rich NCM cathode materials. Thus, superior cycle performance is achieved, especially for NCM811.
- KSP 제안 키워드
- 3-propane sultone, Cathode materials, Cross-linked, Cycle performance, Ethylmethyl carbonate, Functional group, Half-cells, High rate, NCM cathode, Ni-rich, Nickel layered oxide