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Electrolytic solution for improving high temperature performance of polymer lithium ion secondary battery

A secondary battery, high-temperature performance technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of decreased electrolyte conductivity, poor rate performance, etc., to overcome severe gas swelling and capacity loss, good compatibility performance, good high temperature electrochemical properties

Active Publication Date: 2017-04-26
TIANJIN JINNIU POWER SOURCES MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this scheme uses a polymer copolymer to increase the viscosity of the electrolyte, the conductivity of the electrolyte drops more, and the rate performance deteriorates.

Method used

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  • Electrolytic solution for improving high temperature performance of polymer lithium ion secondary battery
  • Electrolytic solution for improving high temperature performance of polymer lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] On the basis of Comparative Example 1, functional additive A accounting for 0.5% of the total mass ratio of the electrolyte was added to prepare the electrolyte.

Embodiment 2

[0037] On the basis of Comparative Example 2, functional additive A accounting for 1.0% of the total mass ratio of the electrolyte was added to prepare the electrolyte.

Embodiment 3

[0039] On the basis of Comparative Example 3, functional additive B accounting for 0.5% of the total mass ratio of the electrolyte was added to prepare the electrolyte.

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PUM

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Abstract

The present invention provides an electrolytic solution for improving the high temperature performance of a polymer lithium ion secondary battery. The electrolytic solution comprises a nonaqueous organic solvent, a negative electrode film forming additive and a lithium salt electrolyte, and further contains a functional additive represented by a structure formula I and accounting for 0.5-10% of the total mass of the electrolytic solution, wherein R1 represents optionally C1-C10 halogenated alkyl, and R2 and R3 are halogen atoms, -H, -CN, or C1-C10 alkyl (R1 and R2 can be the same or different), and the functional additive can form the stable low-impedance electrolyte membrane at the positive electrode so as to effectively reduce the reaction activity of the positive electrode to further inhibit the decomposition of the electrolytic solution. According to the present invention, the disadvantage that the polymer lithium ion secondary battery can produce serious bulging and capacity loss during the high temperature storage is overcome, and the electrolytic solution system has good compatibility with the positive electrode and the negative electrode of the lithium ion secondary battery, and further has advantages of good high temperature electrochemical property, good high temperature storage property, and good rate discharge performance.

Description

technical field [0001] The invention relates to the technical field of high-energy batteries, in particular to an electrolyte solution for improving the high-temperature performance of a polymer lithium-ion secondary battery. Background technique [0002] Lithium-ion polymer battery is the most advanced secondary battery in the world today. It has gradually replaced nickel-cadmium and lead-acid batteries. It is used in mobile phones, notebook computers, MP3, PDA, DV and other digital products, and has gradually become an important part of people's work and life. An indispensable must-have. The safety of the battery is the most important factor affecting the application of the battery. The gas swelling phenomenon of the lithium battery is the main factor affecting the safety of the battery, resulting in a decrease in the performance of the battery. Since lithium-ion polymer batteries use composite aluminum-plastic film as the outer packaging material, they cannot withstand l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 董晶赵庆云桑俊利张丽红秦凯陈世娟
Owner TIANJIN JINNIU POWER SOURCES MATERIAL