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Preparation method of electrolyte safety additive for lithium-ion batteries

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem that lithium-ion batteries are prone to spontaneous combustion or explosion, cannot block heat-producing side reactions, and intensify heat production Response and other issues to achieve the effect of improving safety performance, high manufacturing efficiency, and reducing heat-generating reactions

Inactive Publication Date: 2017-06-09
长兴天晟能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, method 1 has been widely used and can significantly improve the safety characteristics of lithium-ion batteries. However, because the ceramic-coated separator can only improve the thermal stability of the separator, it cannot block the heat-generating side reactions, so its improvement effect is limited.
Method 2 can partially curb the thermal runaway reaction of the battery, but since the electrodes of lithium-ion batteries are usually porous electrodes, the electrolyte is filled in the abundant electrode gaps; although the lithium ion conduction between the positive and negative electrodes is blocked, the inside of the electrodes The reaction between the active material and the electrolyte is still going on, which will further lead to heat accumulation and trigger a thermal runaway reaction
The disadvantage of the above two treatment methods is that they both treat the lithium-ion battery separator or use new materials, but they cannot completely contain the occurrence and continuous deterioration of the heat-generating reaction inside the lithium-ion battery from the source, and may even aggravate this production. Thermal reactions that make lithium-ion batteries more prone to spontaneous combustion or explosion over a period of time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of electrolyte safety additive for lithium-ion batteries, prepared by the following steps:

[0032] a) Weigh raw materials according to the following parts by weight: 12 parts of low-density polyethylene with a molecular weight of 20000, 8 parts of conductive graphite as a conductive agent, 8 parts of a binder, 2 parts of a dispersant, and 25 parts of absolute ethanol; the binder is It is prepared by mixing ultra-high molecular weight polyethylene and polyvinylidene fluoride at a weight ratio of 1:2.5, and the dispersant is glyceryl tristearate;

[0033] b) Take half of the absolute ethanol in the raw material, add a dispersant and a conductive agent to it in sequence, and disperse ultrasonically for 10 minutes to prepare a mixed liquid A; heat to 30°C during ultrasonic dispersion;

[0034] c) Add polyethylene and binder in sequence to the other half of absolute ethanol, and ultrasonically disperse until the polyethylene and binder are completely di...

Embodiment 2

[0039] A preparation method of electrolyte safety additive for lithium-ion batteries, prepared by the following steps:

[0040] a) Weigh raw materials according to the following parts by weight: 14 parts of low-density polyethylene with a molecular weight of 25,000, 11 parts of Ketjen Black as a conductive agent, 9 parts of a binder, 2.5 parts of a dispersant, and 28 parts of absolute ethanol; It is prepared by mixing ultra-high molecular weight polyethylene and polyvinylidene fluoride at a weight ratio of 1:3, and the dispersant is glyceryl tristearate;

[0041] b) Take half of the absolute ethanol in the raw material, add a dispersant and a conductive agent to it in turn, and disperse it ultrasonically for 14 minutes to prepare a mixed liquid A; heat it to 33°C during ultrasonic dispersion;

[0042] c) Add polyethylene and binder in sequence to the other half of absolute ethanol, and ultrasonically disperse until the polyethylene and binder are completely dissolved to prepare ...

Embodiment 3

[0047] A preparation method of electrolyte safety additive for lithium-ion batteries, prepared by the following steps:

[0048] a) Weigh raw materials according to the following parts by weight: 14 parts of low-density polyethylene with a molecular weight of 35,000, 13 parts of acetylene black as a conductive agent, 9 parts of a binder, 2.5 parts of a dispersant, and 32 parts of absolute ethanol; the binder is It is prepared by mixing ultra-high molecular weight polyethylene and polyvinylidene fluoride at a weight ratio of 1:3.5, and the dispersant is vinyl bis stearamide;

[0049] b) Take half of the absolute ethanol in the raw material, add a dispersant and a conductive agent to it in turn, and disperse it ultrasonically for 17 minutes to prepare a mixed liquid A; heat it to 36°C during ultrasonic dispersion;

[0050] c) Add polyethylene and binder in sequence to the other half of absolute ethanol, and ultrasonically disperse until polyethylene and binder are completely diss...

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Abstract

The invention relates to the technical field of lithium-ion batteries and discloses a preparation method of electrolyte safety additive for lithium-ion batteries, comprising the steps, such as weighing raw materials, preparing mixed liquid A, preparing mixed liquid B, and mixing to obtain mixed liquid, wherein the raw materials include polystyrene, a conductive agent, a binder, a dispersant and absolute ethyl alcohol; the conductive agent is conductive graphite, ketjen black, acetylene black or graphene; the binder is a mixture of ultra-high-molecular-weight polystyrene and polyvinylidene fluoride. The preparation method according to the invention is simple and high in manufacture efficiency; by adding the electrolyte safety additive prepared herein to lithium-ion battery electrolyte, it is possible to improve safety of the electrolyte, and it is also possible for an assembled lithium-ion battery to be capable of automatically stopping heat-productive reaction at high temperature so that the heat produced in the use of the lithium-ion battery never poses a threat on the normal use and safety of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a preparation method of an electrolyte safety additive for lithium-ion batteries. Background technique [0002] In recent years, the rapid development of portable electronic products, electric vehicles, energy storage power stations and other fields has put forward higher requirements for energy storage technology. Lithium-ion batteries are the first choice in these fields due to their high energy density, and their energy density is getting higher. As the energy density of lithium-ion batteries is getting higher and higher, the safety problems it faces are becoming more and more severe, which has severely limited the terminal use of high-energy-density lithium-ion batteries. [0003] The safety problem of lithium-ion batteries is mainly due to the thermal runaway of batteries. Due to the abnormal heat generation reaction inside the battery, the intern...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 佘海中
Owner 长兴天晟能源科技有限公司