Electrolyte with thermocuring effect and preparation method of electrolyte

An electrolyte and thermal curing technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as the inability to solve the safety problems of lithium-ion batteries, and achieve the effect of improving safety performance

Inactive Publication Date: 2017-11-07
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of various factors, the above methods c

Method used

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  • Electrolyte with thermocuring effect and preparation method of electrolyte
  • Electrolyte with thermocuring effect and preparation method of electrolyte

Examples

Experimental program
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Example Embodiment

[0022] Example 1

[0023] This embodiment provides an electrolyte with thermal curing effect, including lithium salt, carbonate organic solvent, film-forming additives, polymer monomer and initiator, and the polymer monomer is N,N-4,4 -Diphenylmethane bismaleimide. The mass content of polymer monomer accounts for 1% of the electrolyte. Lithium salt is LiPF 6 , The concentration of lithium salt is 0.8M. The carbonate-based organic solvent is 20% by weight of ethylene carbonate, 40% by weight of ethyl methyl carbonate, and 40% by weight of diethyl carbonate. The mass content of the film-forming additives accounts for 1% of the electrolyte. The film-forming additives are vinylene carbonate and fluoroethylene carbonate. The mass content of the initiator accounts for 0.01% of the electrolyte. The initiator is azobisisobutyronitrile. The preparation method includes the following steps:

[0024] Step 1: Measure out ethyl methyl carbonate and diethyl carbonate in proportions, and po...

Example Embodiment

[0027] Example 2

[0028] The difference from Example 1 is that in this example, the polymer monomer is a bismaleimide oligomer. The mass content of polymer monomer accounts for 3% of the electrolyte. Lithium salt is LiPF 6 , The concentration of lithium salt is 1.0M. The carbonate-based organic solvent is 40% by weight of ethylene carbonate, 20% by weight of ethyl methyl carbonate, and 40% by weight of diethyl carbonate. The mass content of the film-forming additives accounts for 3% of the electrolyte. The film-forming additives are vinylene carbonate and vinyl ethylene carbonate. The mass content of the initiator accounts for 0.03% of the electrolyte. The initiator is azobisisoheptonitrile.

[0029] Others are the same as in Embodiment 1, and will not be repeated here.

Example Embodiment

[0030] Example 3

[0031] The difference from Example 1 is that in this example, the polymer monomer is 1,3-dioxolane. The mass content of polymer monomer accounts for 5% of the electrolyte. Lithium salt is LiPF 6 , The concentration of lithium salt is 1.2M. The carbonate-based organic solvent is 30 wt% of ethylene carbonate, 40 wt% of ethyl methyl carbonate, and 30 wt% of diethyl carbonate. The mass content of the film-forming additives accounts for 5% of the electrolyte. The film-forming additives are vinyl ethylene carbonate and fluoroethylene carbonate. The mass content of the initiator accounts for 0.05% of the electrolyte. The initiator is dimethyl azobisisobutyrate.

[0032] Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of electrolyte of lithium ion batteries and particularly relates to electrolyte with a thermocuring effect. The electrolyte is prepared from lithium salt, a carbonic ester organic solvent, a film forming additive, a polymer monomer and an initiator, wherein the polymer monomer is one or more of N,N-4,4-diphenylmethylenebismaleimide, a bismaleimide oligomer, 1,3-dioxolane and neopentyl glycol diacrylate. By comparison with the prior art, the polymer monomer can be subjected to a thermo-crosslinking reaction under the action of the initiator at the temperature of 90-130 DEG C to cure the electrolyte and stop an electrode reaction, so that overheating protection is provided for batteries, and the safety performance of the batteries is improved. Additionally, the invention further provides a preparation method of the electrolyte with the thermocuring effect. The preparation method is simple to operate, and the electrolyte prepared with the preparation method is good in quality.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery electrolyte, and in particular relates to an electrolyte with thermal curing effect and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high output power, long charge and discharge life, no pollution, wide operating temperature range and small self-discharge. As a new type of high-energy chemical power source, it has encountered the greatest challenge in the process of solving human environmental pollution and energy crisis, that is, safety. Lithium-ion batteries will cause internal short circuit or overcharge due to overcurrent, internal dendrites, and other abuse conditions, which will lead to internal heat accumulation. When the heat accumulates to a certain level, it will cause the electrolyte, the positive electrode and other internal materials to generate heat interlocking The reaction eventually lead...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/4235Y02E60/10
Inventor 胡清平陶芝勇吴吉强刘焱刁胜曾坚义
Owner SHENZHEN HAIYING TECH
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