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

3 Cites 9 Cited by

AI-Extracted Technical Summary

Problems solved by technology

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

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Method used

In addition, as can be seen from Table 1, fire or explosion take place and mainly focus on embodiment 1~4, and embodiment 5~10 does not all have fire or explosion, that is to say, the made of embodiment 5~10 Its safety in use of the electrolyte is higher than that of the electrolytes prepared in Examples 1 to 4, because two or more polymer monomers are added in Examples 5 to 10, and among multiple polymer monomers There is a synergistic effect between these three polymers, N,N-4,4-diphenylmetha...

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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.

Application Domain

Secondary cells servicing/maintenance

Technology Topic

Neopentylglycol diacrylateDioxolane +7

Image

Examples

Experimental program(11)
Comparison scheme(10)

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 pour them into aluminum bottles;

[0025] Step 2: Weigh ethylene carbonate and LiPF according to the calculated mass 6 , Added to the aluminum bottle, shake to make it completely dissolved;

[0026] Step 3: Add film-forming additives, polymer monomers and initiators in proportions, shake to dissolve, shake up, and place for 24 hours to obtain an electrolyte with thermal curing effect.

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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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve safety performance

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

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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