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

Active Publication Date: 2020-03-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first purpose of the present invention is to solve the problem of the incompatibility of succinonitrile-based electrolyte with lith

Method used

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  • Succinonitrile-based electrolyte coupled with organic lithium salt and fluoroethylene carbonate as well as preparation method and application of electrolyte
  • Succinonitrile-based electrolyte coupled with organic lithium salt and fluoroethylene carbonate as well as preparation method and application of electrolyte
  • Succinonitrile-based electrolyte coupled with organic lithium salt and fluoroethylene carbonate as well as preparation method and application of electrolyte

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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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Abstract

The invention discloses a succinonitrile-based electrolyte coupled with an organic lithium salt and fluoroethylene carbonate, and relates to the technical field of lithium-ion batteries. The specificscheme is as follows: the succinonitrile-based electrolyte coupled with an organic lithium salt and fluoroethylene carbonate comprises succinonitrile, an organic lithium salt and fluoroethylene carbonate, wherein the molar ratio of the succinonitrile to the organic lithium salt is 100: 1-1:1, the organic lithium salt is a combination of a sulfonyl imide lithium salt and lithium oxalyldifluoroborate, the molar ratio of the sulfonyl imide lithium salt to the lithium oxalyldifluoroborate is 100: 1-1: 1, and the fluoroethylene carbonate accounts for 5-50% of the total volume of the succinonitrile-based electrolyte. The invention further discloses a preparation method of the succinonitrile-based electrolyte and application of the succinonitrile-based electrolyte to a lithium metal battery, theelectrolyte can form an organic-inorganic composite SEI film on the surface of metal lithium, side reaction of succinonitrile and metal lithium is avoided, and the interface stability and electrochemical performance of the battery are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a succinonitrile-based electrolyte coupled with an organic lithium salt and fluoroethylene carbonate, a preparation method and an application thereof. Background technique [0002] As people pay more and more attention to the environment and sustainable energy development, it is imperative to develop next-generation energy storage technology with high energy density, high power density, and environmental friendliness. Rechargeable lithium metal batteries have once again attracted widespread attention as an ideal choice. Compared with lithium-ion batteries using graphite anodes, the use of lithium metal anodes will greatly increase the energy density of the batteries. High-performance electrolyte materials are the key to the practical application of lithium metal batteries. Commercial lithium-ion battery electrolytes are composed of organic carbonate solvents and li...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0525H01M2300/0025Y02E60/10
Inventor 高云智付传凯马玉林李素丽赵伟徐延铭
Owner HARBIN INST OF TECH
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