Journal
ACS MATERIALS LETTERS
Volume 3, Issue 6, Pages 838-844Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.1c00276
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Funding
- Science and Technology Innovation Commission of Shenzhen City [JCYJ20180507181858539, JCYJ20190808173815205]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515012111]
- National Natural Science Foundation of China [51804199]
- National Key RAMP
- D Program of China [2019YFB2204500]
- Shenzhen Science and Technology Program [KQTD20180412181422399]
- China Postdoctoral Science Foundation [2020M672805]
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This study conducted a systematic comparison between two representative high-concentration electrolytes (LHCEs) based on DMC and DME in high-voltage Li metal batteries, revealing that DME-based LHCE exhibits better compatibility and stability with Li metal anodes than DMC-based LHCE. The findings provide fresh insights on the stable nature of ether-based LHCE with Li metal anodes for advanced electrolyte engineering.
Localized high-concentration electrolytes (LHCEs) have captured considerable attention, since they retain the merits of high-concentration electrolytes while circumventing the disadvantages of high viscosity and high costs. Herein, a systematic comparison between two representative LHCEs (i.e., dimethyl carbonate (DMC)-based LHCE and 1,2-dimethoxyethane (DME)-based LHCE) in high-voltage Li metal batteries was performed. The results showed that DME-based LHCE possesses better compatibilty with Li metal anodes than DMC-based LHCE, and the underlying mechanism is clarified from the point of solid electrolyte interphase (SEI) formation. The two representative LHCEs showed comparable reductive stability, while Li+-DME showed better reductive stability than Li+-DMC. This means the more prominent decomposition of anions in DME-based LHCE, since SEI is derived from the competitive decomposition products of solvents and anions, which is further verified by the more-complete anion decomposition products found in SEI formed in DME-based LHCE. The inorganic-rich SEI with superior passivating ability is reponsible for the good compatibility of DME-based LHCE with Li metal anodes. The findings in this study provides fresh understandings on the stable nature of ether-based LHCE with Li metal anodes, which can serve as guidelines for advanced electrolytes engineering.
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