High temperature safety lithium ion battery non-aqueous electrolyte

A non-aqueous electrolyte, lithium-ion battery technology, applied in the field of lithium-ion battery non-aqueous electrolyte, can solve the problems of low electrolyte flash point, runaway battery, thermal breakdown, etc., achieve good conductivity, increase capacity, improve The effect of high temperature performance

Active Publication Date: 2016-08-24
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte commonly used in lithium-ion batteries has a low flash point and is flammable, which has become a safety hazard during the use of lithium-ion batteries.
Lithium-ion secondary batteries emit a lot of heat when they are overcharged and discharged, short-circuited, and operated at high current for a long time. These heats become a safety hazard for flammable electrolytes, which can cause catastrophic thermal breakdown (thermal runaway) or even battery explosion

Method used

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  • High temperature safety lithium ion battery non-aqueous electrolyte
  • High temperature safety lithium ion battery non-aqueous electrolyte
  • High temperature safety lithium ion battery non-aqueous electrolyte

Examples

Experimental program
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Embodiment 1

[0014] In this example, the electrolyte is prepared in a BRAUN glove box, which is filled with nitrogen gas with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is at room temperature. Mix 20 grams of ethylene carbonate, 40 grams of ethyl methyl carbonate and 40 grams of 1-methyl-3-ethylimidazolium tetrafluoroborate evenly, seal it and put it in a refrigerator until it cools to 8 After ℃, transfer to the glove box, then add LiPF6 in two batches and mix thoroughly to form a non-aqueous electrolyte solution for lithium-ion batteries with a molar concentration of lithium salt of 1 mol / L. Add the total mass of solvent 1 % vinylene carbonate, 3% 1,3-propane sultone, and 1% tris(2,2,2-trifluoroethyl) phosphite are evenly mixed to obtain a lithium-ion non-aqueous electrolyte .

Embodiment 2

[0016] This embodiment is roughly the same as the embodiment, the difference is that 30 grams of ethylene carbonate and 30 grams of diethyl carbonate are mixed uniformly and sealed, and 40 grams of 1,2-dimethyl-3-ethane is used in this embodiment. Mix imidazole hexafluorophosphate evenly, seal it and put it in the refrigerator until it cools to 8°C, then transfer it to the glove box, then add LiPF6 in two batches and mix well to form the molar concentration of the lithium salt is 1.2mol / L The non-aqueous electrolyte of the lithium-ion battery, in the above non-aqueous electrolyte, add 2% vinylene carbonate, 3% 1,3-propane sultone, 3% tris(2,2 , 2-trifluoroethyl) phosphoric acid ester is uniformly mixed to obtain a lithium-ion non-aqueous electrolyte.

Embodiment 3

[0018] The present embodiment is roughly the same as the embodiment, and the difference is that the present embodiment is that 30 grams of ethylene carbonate, 40 grams of ethyl methyl carbonate, 30 grams of diethyl carbonate and 40 grams of 1-methyl-3 - Mix ethylimidazole hexafluorophosphate evenly, seal it and put it in the refrigerator until it cools down to 8°C, then transfer it to the glove box, then add LiPF6 in two batches and mix well to form a lithium salt with a molar concentration of 1.2mol / L The non-aqueous electrolyte of the lithium-ion battery, in the above non-aqueous electrolyte, add 3% vinylene carbonate, 3% 1,3-propane sultone, 5% tris(2,2 , 2-trifluoroethyl) methyl phosphate is evenly mixed to obtain a lithium ion non-aqueous electrolyte.

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Abstract

The invention discloses nonaqueous electrolyte of a lithium ion battery. By adopting the nonaqueous electrolyte of the lithium ion battery, the safety of the battery under a high temperature condition can be improved, the burning or explosion of the battery caused by excessively heating can be prevented, and the capacity of the battery can be increased. The nonaqueous electrolyte comprises 60 to 100 parts by weight of carbonic ester solvent, 30 to 40 parts by weight of ion liquid, 1 to 10 parts by weight of additives, wherein the carbonic ester solvent is at least one of annular carbonic ester and chain-type carbonic ester, and the molar concentration of the lithium salt in the non-aqueous electrolyte is 0.5 to 1.5 mol/L. The ion liquid is introduced into the conventional carbonic ester solvent, so that the storage safety performance of the battery at a high temperature of 150DEG C can be obviously improved.

Description

technical field] [0001] The invention relates to a nonaqueous electrolytic solution of a lithium ion battery, in particular to a nonaqueous electrolytic solution of a lithium ion battery which improves the high temperature safety performance of the battery. Background technique] [0002] Lithium-ion batteries are widely used in various electronic devices such as notebook computers, mobile phones, and MP4s because of their advantages such as high working voltage, high energy density, environmental friendliness, stable cycle, and safety. However, with the wide application of electronic equipment, people have higher and higher requirements for battery capacity, which also put forward higher requirements for the working voltage and energy density of lithium-ion batteries. The important main component of lithium-ion battery, its composition is basically stable, mainly EC, DMC, PC, EMC, DEC, etc. With the continuous expansion of the lithium-ion battery market, safety issues have b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0566
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025H01M2300/0028Y02E60/10
Inventor 王霹霹陈性保戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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