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LiTDI :
LiTDI : A Highly Efficient Additive for Electrolyte Stabilization in Lithium-Ion Batteries
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- Xu, Chao (författare)
- Uppsala universitet,Strukturkemi
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- Renault, Stevén (författare)
- Uppsala universitet,Strukturkemi
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- Ebadi, Mahsa (författare)
- Uppsala universitet,Strukturkemi
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- Wang, Zhaohui (författare)
- Uppsala universitet,Oorganisk kemi
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- Björklund, Erik (författare)
- Uppsala universitet,Strukturkemi
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- Guyomard, Dominique (författare)
- Univ Nantes, CNRS, UMR 6502, Inst Mat Jean Rouxel IMN, F-44322 Nantes 3, France.
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- Brandell, Daniel (författare)
- Uppsala universitet,Strukturkemi
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- Edström, Kristina (författare)
- Uppsala universitet,Strukturkemi
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- Gustafsson, Torbjörn (författare)
- Uppsala universitet,Strukturkemi
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(creator_code:org_t)
- 2017-03-02
- 2017
- Engelska.
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Ingår i: Chemistry of Materials. - : AMER CHEMICAL SOC. - 0897-4756 .- 1520-5002. ; 29:5, s. 2254-2263
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- The poor stability of LiPF6-based electrolytes has always been a bottleneck for conventional lithium-ion batteries. The presence of inevitable trace amounts of moisture and the operation of batteries at elevated temperatures are particularly detrimental to electrolyte stability. Here, lithium 2trifluoromethy1-4,5-dicyanoimidazole (LiTDI) is investigated as a moisture-scavenging electrolyte additive and can sufficiently suppress the hydrolysis of LiPF6. With 2 wt % LiTDI, no LiPF6 degradation can be detected after storage for 35 days, even though the water level in the electrolyte is enriched by 2000 ppm. An improved thermal stability is also obtained by employing the LiTDI additive, and the moisture-scavenging mechanism is discussed. The beneficial effects of the LiTDI additive on battery performance are demonstrated by the enhanced capacity retention of both the LiNi1/3Mn1/3Co1/3O2 (NMC)/Li and NMC/graphite cells at 55 degrees C. In particular, the increase in cell voltage hysteresis is greatly hindered when LiTDI is presented in the electrolyte. Further development of the LiTDI additive may allow the improvement of elevated-temperature batteries, as well as energy savings by reducing the amount of effort necessary for dehydration of battery components.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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