Succinonitrile-based electrolyte coupled with organic lithium salt and fluoroethylene carbonate as well as preparation method and application of electrolyte
A fluoroethylene carbonate and organolithium technology, applied in the field of lithium ion batteries, can solve problems such as metal lithium incompatibility
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specific Embodiment approach 1
[0027] A succinonitrile-based electrolyte coupling organic lithium salt and fluoroethylene carbonate, comprising succinonitrile, organic lithium salt and fluoroethylene carbonate, wherein the molar ratio of succinonitrile to organic lithium salt is 100:1 ~1:1, organolithium salt is a combination of lithium sulfonylimide salt and lithium difluorooxalate borate, wherein the molar ratio of lithium sulfonylimide salt to lithium difluorooxalate borate is 100:1~1:1 The fluoroethylene carbonate accounts for 5%-50% of the total volume percentage of the succinonitrile-based electrolyte.
[0028] Preferably, the molar ratio of succinonitrile to organic lithium salt is 20:1˜5:1.
[0029] Preferably, the molar ratio of the lithium sulfonylimide salt to lithium difluorooxalate borate is 50:1˜1:1.
[0030] Preferably, the lithium sulfonylimide salt is at least one of lithium bistrifluoromethylsulfonimide LiTFSI and lithium bisfluorosulfonimide LiFSI.
specific Embodiment approach 2
[0032] The preparation method of the succinonitrile-based electrolyte of coupling organic lithium salt and fluoroethylene carbonate described in the specific embodiment one, comprises the following steps:
[0033] Step 1. Mix succinonitrile and organic lithium salt according to the molar ratio, and stir at 60-80°C until the lithium salt is fully dissolved to obtain mixture A;
[0034] Step 2: Add fluoroethylene carbonate to the mixture A according to volume percentage, stir and mix evenly at 60-80° C. to obtain a succinonitrile-based electrolyte coupling organic lithium salt and fluoroethylene carbonate.
specific Embodiment approach 3
[0036] A lithium metal battery, comprising the succinonitrile-based electrolyte coupling organic lithium salt and fluoroethylene carbonate described in the first embodiment.
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