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Lithium battery

A lithium battery and lithium salt technology, which is applied to lithium batteries, secondary batteries, battery pack components, etc., can solve the problems of flammable diaphragm, melting, low flash point of organic solvents, etc., to improve safety and improve charging and discharging. performance, to solve the effect of poor wettability

Inactive Publication Date: 2017-07-04
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome safety problems such as relatively low flash point of organic solvents, easy to burn and polyolefin separators, closed cells at about 120°C, and melting above 160°C, and provide a high-safety Non-flammable lithium-ion battery solvent and separator for lithium batteries
[0008] The beneficial effects of the present invention are: providing a high-safety cellulose non-woven diaphragm and an ionic liquid solvent, simultaneously solving the problems of poor wettability between the ionic liquid solvent and the traditional polyolefin diaphragm, improving the charging and discharging performance of the power battery, Doubling down on the safety of lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: According to the same method as Comparative Example 1, an appropriate amount of ionic liquid solvent was added dropwise on the (polyethylene terephthalate / PET) fiber separator, and the wetting performance between the two was observed with the naked eye.

Embodiment 2

[0027] Example 2: According to the same method as Comparative Example 2, drop 5 μL of the electrolyte solution containing the ionic liquid solvent on the surface of the PET separator, obtain its image information through a contact angle measuring instrument, and then analyze the obtained image by a computer. Get the specific value of the contact angle.

Embodiment 3

[0028] Embodiment 3: according to the same method as Comparative Example 3, the difference is that the PET diaphragm is soaked in ionic liquid (PYR 13 In TFSI), the flammability of the diaphragm was observed by direct ignition with an ignition gun.

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Abstract

The invention discloses a lithium battery. The lithium battery comprises a cellulose non-woven fabric diaphragm and an electrolyte, wherein the electrolyte contains an ionic liquid solvent; the cellulose non-woven fabric battery diaphragm is selected from one or more of polypropylene fiber, polyacrylonitrile fiber, formalized polyvinyl alcohol fiber, polyethyleneterephthalate, polyethylene glycol terephthalate, nylon and poly-p-phenylene terephthamide. The ionic liquid solvent is preferably selected from aliphatic quaternary ammonium salt, quaternary phosphonium salt, pyrrole salt, pyrrolidone salt, imidazolium salt and piperidine salt. Meanwhile, the invention provides the high-safety cellulose non-woven fabric diaphragm and the ionic liquid solvent, and the problem that the wettability of the ionic liquid solvent with a traditional polyolefin diaphragm is low is also solved, so that the charge and discharge performance of the power battery is improved, and the safety of the lithium battery is doubled and improved.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium batteries, in particular to a lithium battery. [0003] 【Background technique】 [0004] At present, lithium batteries have been more and more widely used in the field of electric vehicles. Lithium batteries are mainly composed of positive electrode material, negative electrode material, electrolyte and separator. Although organic electrolytes have been practically used in commercial batteries, safety has always been a problem restricting their development. This is mainly due to the fact that the organic solvents in the electrolyte have a relatively low flash point and are easy to burn. , short circuit, high temperature and other conditions lead to an increase in internal temperature, excessive heat accumulation inside the battery will cause the electrolyte to decompose and generate a large amount of gas, causing a sharp increase in the internal pressure of the battery, bringing safety haz...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052H01M10/0569H01M50/417H01M50/44H01M50/489
CPCH01M10/052H01M10/0569H01M50/411H01M50/44Y02E60/10
Inventor 饶睦敏王振峰
Owner OPTIMUM BATTERY CO LTD
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