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Flame-retardant lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as fire, explosion, increased battery complexity, and production costs, and achieve improved flame retardancy and low cycle performance Effect

Inactive Publication Date: 2010-04-14
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the electrolyte of lithium-ion batteries is composed of flammable organic solvents and lithium salts, and because the batteries will emit a lot of heat during use, these organic solvents and their vapors are easy to catch fire and cause fires or even explosions, directly causing lithium The safety issue of ion batteries has affected the widespread use of lithium-ion batteries
Although researchers have installed safety valves on batteries, these additional devices increase the complexity and production costs of batteries, and cannot completely solve battery safety issues.

Method used

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  • Flame-retardant lithium ion battery electrolyte
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  • Flame-retardant lithium ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In an argon-filled glove box (H 2 4 parts of 100g lithium-ion battery electrolyte EC / EMC / DMC=1:1:1 (wt%) 1mol / L LiPF were prepared respectively in (06 , recorded as A, B, C, and D samples, and then add ethylene bis-tetrabromophthalimide with a mass percentage of 1, 3, and 5 in B, C, and D samples respectively;

[0020]

[0021] Such as figure 1 It can be seen that with the increase of the mass percentage of the additive, the self-extinguishing time decreases continuously, which proves that the flame retardancy of the ethylene bis-tetrabromophthalimide additive used in the electrolyte of lithium-ion batteries is better.

[0022] figure 2 It is the charge-discharge cycle performance curve of the aluminum shell lithium battery injected into the electrolyte A and D samples. It can be seen from the figure that the addition of additives in the lithium-ion battery electrolyte has little effect on the cycle performance and discharge capacity of the lithium battery.

Embodiment 2

[0024] In an argon-filled glove box (H 2 4 parts of 100g lithium-ion battery electrolyte EC / EMC / DMC=1:1:1 (wt%) 1mol / L LiPF were respectively configured in (06 , recorded as samples E, F, G, and H, and then adding ethylene bis-tetrachloromethylphthalimide with a mass percentage of 1, 3, and 5 to samples F, G, and H respectively;

[0025]

[0026] Such as image 3 It can be seen that when the addition of additives increases from 0wt% to 5wt%, the self-extinguishing time can be reduced from 88s / g to 39s / g, which proves that the ethylene bis-tetrachloromethylphthalamide used in lithium-ion battery electrolyte The flame retardancy of imide additive is better.

[0027] Figure 4 It is the charge-discharge cycle performance curve of the aluminum shell lithium battery injected with electrolyte E and H samples. It can be seen from the figure that the addition of additives in the lithium-ion battery electrolyte has almost no effect on the cycle performance and discharge capacity o...

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Abstract

The invention discloses flame-retardant lithium ion battery electrolyte with functions of flame retardance and even incombustibly. The electrolyte contains ethylene diphthalimide derivative used as additive, the structural formula of the ethylene diphthalimide derivative is as follows: in the structural formula, R is halogen, alkyl, a phenyl group, a biphenylyl group, a phenylate group, a haloalkane group, a halogeno benzene group and a halogenated biphenyl group, wherein the halogen is F, C1 or Br, and halogenating is primary, disubstituted or trisubstituted. Through adding the flame-retardant additive in the lithium ion battery electrolyte, flame-retardant property of the electrolyte can be increased greatly, and further the flame-retardant additive seldom affects other properties of lithium ion batteries such as capacity, circulation properties and the like.

Description

technical field [0001] The invention relates to a lithium ion electrolyte in a lithium ion battery. Background technique [0002] Due to the advantages of high specific energy, high voltage, small size, and light weight, lithium-ion batteries have achieved great development in the past ten years and have become one of the main power sources of communication electronic products. However, at present, the electrolyte of lithium-ion batteries is composed of flammable organic solvents and lithium salts, and because the batteries will emit a lot of heat during use, these organic solvents and their vapors are easy to catch fire and cause fires or even explosions, directly causing lithium The safety problems of ion batteries have affected the widespread use of lithium ion batteries. Although researchers have installed safety valves on batteries, these additional devices increase the complexity and production costs of batteries, and cannot completely solve battery safety issues. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056
CPCY02E60/12Y02E60/10
Inventor 陈黎骆宏钧
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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