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Flame retardant additive for electrolyte and flame retardant lithium ion battery electrolyte

A technology of lithium-ion batteries and flame-retardant additives, which is applied in the field of flame-retardant additives for electrolytes and flame-retardant lithium-ion battery electrolytes, can solve the problems of low lithium salt solubility, low flame-retardant efficiency, and limited dosage, and achieve Good electrochemical performance, reduced flammability, wide application market effect

Active Publication Date: 2015-08-19
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these additives have high viscosity, high freezing point, low solubility of lithium salt, low flame retardant efficiency, and the amount used as an additive is limited

Method used

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  • Flame retardant additive for electrolyte and flame retardant lithium ion battery electrolyte
  • Flame retardant additive for electrolyte and flame retardant lithium ion battery electrolyte
  • Flame retardant additive for electrolyte and flame retardant lithium ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 24

[0041] in the presence of 1M LiPF 6 Add methyl fluorosulfonyl difluoroacetate (structural formula as II) and 2% fluoroethylene carbonate to the electrolyte solution of ethylene carbonate, dimethyl carbonate and diethyl carbonate with a volume ratio of 1:1:1, 1% vinylene carbonate and 2% propane sultone were formulated into electrolytes containing different mass ratios of methyl fluorosulfonyl difluoroacetate.

[0042] Take 1 gram of electrolyte solution and place it in a 5ml crucible, ignite it to test its self-extinguishing time and the change of conductivity. Ignite quickly, and record the time from when the ignition device is removed to when the flame is automatically extinguished, which is the self-extinguishing time (SET). The SET of each concentration of electrolyte sample was measured at least 6 times and the average value was taken. The flame retardant properties of different flame retardant electrolytes were compared based on the self-extinguishing time per unit mas...

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Abstract

The invention belongs to the technical field of battery materials and particularly relates to a flame-retardant additive for electrolyte and flame-retardant lithium ion battery electrolyte. The flame-retardant additive provided by the invention is at least one of the following compounds and the structural general formula of the flame-retardant additive is as shown in (I), wherein R is any one of alkyl, alkoxy, halogenated alkyl, halogenated alkoxy, halogenated alkylene, phenyl, xenyl, halogenated phenyl, halogenated biphenyl, alkyl silicone, alkoxy silane, alkyl phosphate, alkoxy boron and acylamino; and halogen is F, Cl or Br, and the halogenation is partial or full substitution. Electrolyte using the flame-retardant additive has low viscosity, low toxicity, wide electrochemical window and temperature range and has a high flame retardant effect at the same time; a lithium battery using the electrolyte not only has good electrochemical performance, and the security is improved greatly, so that the lithium battery has a wider application market.

Description

technical field [0001] The invention belongs to the technical field of battery materials, in particular to a flame retardant additive for electrolyte and a flame retardant lithium ion battery electrolyte. Background technique [0002] With the rapid development of information technology and the increasing popularity of portable electronic devices, the demand for high specific energy batteries is increasing year by year. Lithium batteries have significant advantages such as high voltage, low self-discharge rate, and high energy density, and are gradually replacing traditional batteries and expanding their application fields and market share. [0003] However, the potential safety hazards of lithium batteries have always been the primary concern of applications. At present, the electrolyte used in lithium batteries is a flammable carbonate (ether) mixed solvent system. Under the conditions of overcharging, short circuit, heating and other abuse conditions, the battery may ign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M6/16
CPCH01M6/168H01M10/0567H01M2300/0025Y02E60/10
Inventor 李立飞冯金奎任海赵志华刘永张修涛
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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