Journal
SMALL
Volume 15, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201900269
Keywords
additive; dual-salt electrolyte; lithium-metal battery; solid electrolyte interphase; wide temperature operation
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Funding
- Think-Tank Mutual Fund of Qingdao Energy Storage Industry Scientific Research
- National Natural Science Foundation for Distinguished Young Scholars of China [51625204]
- National Natural Science Foundation of China [51502319]
- National Key R&D Program of China [2018YFB0104300]
- Youth Innovation Promotion Association CAS [2017253]
- Key Scientific and Technological Innovation Project of Shandong [2017CXZC0505]
- Shandong Provincial Natural Science Foundation [ZR2016BQ18]
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In this study, self-synthesized lithium trifluoro(perfluoro-tert-butyloxyl)borate (LiTFPFB) is combined with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) to formulate a novel 1 m dual-salt electrolyte, which contains lithium difluorophosphate (LiPO2F2) additive and dominant carbonate solvents with low melting point and high boiling point. The addition of LiPO2F2 into this novel dual-salt electrolyte dramatically improves cycleability and rate capability of a LiNi0.5Mn0.3Co0.2O2/Li (NMC/Li) battery, ranging from -40 to 90 degrees C. The NMC/Li batteries adopt a Li-metal anode with low thickness of 100 mu m (even 50 mu m) and a moderately high cathode mass loading level of 10 mg cm(-2). For the first time, this paper provides valuable perspectives for developing practical lithium-metal batteries over a wide temperature range.
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