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Flame-retardant electrolyte for lithium iron phosphate battery

A lithium iron phosphate battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of high electrolyte viscosity, poor battery electrochemical performance, low ionic conductivity of the electrolyte, etc., so as to improve safety, reduce flammability, reduce The effect of improving cycle performance and safety performance

Active Publication Date: 2021-10-01
绍兴铋华科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high viscosity of the electrolyte, low ion conductivity of the electrolyte, and poor electrochemical performance of the battery during the use of the existing lithium-ion battery, the present invention adopts the following technical scheme

Method used

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  • Flame-retardant electrolyte for lithium iron phosphate battery
  • Flame-retardant electrolyte for lithium iron phosphate battery
  • Flame-retardant electrolyte for lithium iron phosphate battery

Examples

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Embodiment 1

[0028] A flame-retardant electrolyte for lithium iron phosphate batteries, which can improve the cycle performance and rate performance of lithium-ion batteries under high and low temperature conditions, and maintain the charge and discharge efficiency of lithium batteries. Flame retardant electrolyte for batteries. Specifically, ethyl methyl carbonate, dimethyl carbonate, and ethylene carbonate are mixed in a volume ratio of 1:1:1, the mass concentration of lithium salt in the electrolyte is 14.5%, and the flame retardant additive is 1-tetrafluoroethylene - 2,3,4-(2-bromobutanone oxime) silane, the mass concentration is 7.5% of the electrolyte solution.

[0029] Among them, the lithium salt is lithium hexafluorophosphate.

Embodiment 2

[0031] Another flame-retardant electrolyte for lithium iron phosphate batteries that is different from that of Example 1. Specifically, the following components are included: ethyl methyl carbonate, dimethyl carbonate, and ethylene carbonate are mixed in a volume ratio of 1:1:1, the mass concentration of lithium salt in the electrolyte is 14.5%, and the flame retardant additive is 1 - Tetrafluorovinyl-2,3,4-(2-bromobutanone oxime) silane, the mass concentration is 13.5% of the electrolyte solution.

[0032] Among them, the lithium salt is lithium hexafluorophosphate.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a flame-retardant electrolyte for a lithium iron phosphate battery. The flame-retardant electrolyte is characterized by comprising the following components: 3%-20% of a lithium salt, 66%-92% of an organic solvent and 5%-13.5% of a flame-retardant additive, wherein the flame-retardant additive is 1-tetrafluoroethylene-2,3,4-(2-bromobutanone-oxime)silane, and the organic solvent is composed of ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate (DMC). According to the invention, the flammability of the flame-retardant electrolyte can be effectively reduced under the condition that the viscosity, the conductivity, the battery cycle performance and the like of the electrolyte are not influenced; and modified fluorosilane has a relatively high flash point or even no flash point and is non-flammable, is beneficial to film formation on the surface of a negative electrode when being applied to the organic electrolyte, plays a crucial role in high-temperature stability of a positive electrode material, and improves the safety of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a flame-retardant electrolyte for lithium iron phosphate batteries. Background technique [0002] The rapid development of industry and economy has brought problems such as the lack of non-renewable energy and environmental pollution. Therefore, the development and utilization of new green and renewable energy has become a hot research field in the field of chemical power sources. Lithium-ion batteries are widely used in our daily life because of their advantages such as high voltage, high energy density, long cycle life, small memory effect, and environmental protection, such as portable traditional electronic devices, power tools, new energy vehicles, energy storage Power stations and other fields have become one of the most promising and competitive high-tech products. With the large-scale expansion and application of lithium-ion batteries, various s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 范修林乔旭升
Owner 绍兴铋华科技有限公司
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