EMRL [EMRL]Prof. Kyu-Young Park: Elucidating and Mitigating High-Voltage Degradation Cascades in Cobalt-F…
페이지 정보

작성자 최고관리자
댓글 0건 조회 624회 작성일 2021-12-20 11:06
본문
LiNiO2 (LNO) is a promising cathode material for next-generation Li-ion batteries
due to its exceptionally high capacity and cobalt-free composition that enables
more sustainable and ethical large-scale manufacturing. However, its poor
cycle life at high operating voltages over 4.1 V impedes its practical use, thus
motivating efforts to elucidate and mitigate LiNiO2 degradation mechanisms at
high states of charge. Here, a multiscale exploration of high-voltage degradation
cascades associated with oxygen stacking chemistry in cobalt-free LiNiO2, is
presented. Lattice oxygen loss is found to play a critical role in the local O3–O1
stacking transition at high states of charge, which subsequently leads to Ni-ion
migration and irreversible stacking faults during cycling. This undesirable atomicscale
structural evolution accelerates microscale electrochemical creep, cracking,
and even bending of layers, ultimately resulting in macroscopic mechanical
degradation of LNO particles. By employing a graphene-based hermetic surface
coating, oxygen loss is attenuated in LNO at high states of charge, which
suppresses the initiation of the degradation cascade and thus substantially
improves the high-voltage capacity retention of LNO. Overall, this study provides
mechanistic insight into the high-voltage degradation of LNO, which will inform
ongoing efforts to employ cobalt-free cathodes in Li-ion battery technology.
관련링크
- 이전글[EMRL]Prof. Kyu-Young Park : Gradational anionic redox enabling high-energy P2-type Na-layered oxide cathode 23.02.20
댓글목록
등록된 댓글이 없습니다.