期刊
ENERGY STORAGE MATERIALS
卷 33, 期 -, 页码 268-275出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.08.015
关键词
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资金
- Planning and Budgeting Committee of the council of high education
- Israeli council of high education
- Yotam Project
- Weizmann Institute Sustainability and Energy Research Initiative
- Ministry of Immigrant Absorption, Israel
- INREP
- IMOE
- Israel Research and Innovation authority through Kamin grant [68005]
- ISF, Israel [2028/17, 2209/17, 1580/17]
The commercialization of the high energy, lithium, and manganese-rich NCM (LMR-NCM) is impeded by its complex interfacial electrochemical processes, oxygen release, and surface degradation. Here, we introduced t-butyl-dimethylsilyllithium as a single-source precursor for depositing LixSiyOz with an integrated network of siloxane moieties as an artificial cathode/electrolyte interphase (ACEI) which stabilizes LMR-NCM by mitigating oxygen release, electrolyte degradation and preventing fractures. Using solid-state NMR coupled with dynamic nuclear polarization, detailed molecular-level characterization of the ACEI is presented. The proposed CEI enabled improved energy-density at high rates (644 Wh.kg(-1), compared to uncoated material with 457 Wh.kg(-1) at 4C) with suppressed parasitic reactions and O-2 evolution. The efficacy of the CEI is demonstrated in full graphite/LMR-NCM pouch cells with similar to 35% enhanced capacity and > 80% capacity retention over 200 cycles. Altogether, these results present the importance of careful selection and design of surface chemistry for stabilizing the electrode/electrolyte interphase in challenging battery chemistries.
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