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A new lithium-ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as explosion and battery combustion, and achieve the effect of improving service life and improving cycle performance.

Active Publication Date: 2020-07-31
XIANGHE KUNLUN NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used solvents for lithium-ion battery electrolytes have low boiling point, low flash point and high volatile flammable organic compounds. When the battery is squeezed, collided, etc. abused, leakage will occur, and the leakage will come into contact with air. Combustion will occur, which will cause the entire battery to burn or even explode. Therefore, the safety of lithium batteries as power equipment for electrical devices is still an important factor restricting their application development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The lithium-ion battery electrolyte provided in this embodiment includes 75% organic solvent; 20% electrolyte and 5% additive. The additives include 50% additive one and 50% additive two, additive one includes vinylene carbonate, 1,3-propane sultone and ethylene carbonate at a ratio of 1:1:1, and additive two is divinyl Fluorinated benzene; organic solvent is composed of 80% solvent one and 20% solvent two, solvent one is 1:2:1:1 ethyl methyl carbonate, propyl propionate, ethyl propionate and propyl acetate The solvent two is 1:1 propylene carbonate and ethylene carbonate; the electrolyte includes 95% lithium hexafluorophosphate, and the balance is 1:1.2:2 lithium difluorophosphate, lithium dioxalate borate and lithium difluorooxalate borate.

Embodiment 2

[0020] The lithium-ion battery electrolyte solution provided in this embodiment includes 80% organic solvent; 10% electrolyte and 10% additive. Additives include 60% additive one and 40% additive two, additive one is 1:2 ethylene carbonate and fluoroethylene carbonate, additive two is divinyl fluorobenzene; organic solvent consists of 50% solvent A combination of solvent 1 and 50% of solvent 2, solvent 1 is dimethyl carbonate and diethyl carbonate at 1:1.5, solvent 2 is propylene carbonate; electrolyte includes 98% lithium hexafluorophosphate, and the balance is 1:2:1.3 : 1.5 lithium difluorophosphate, lithium dioxalate borate, lithium bisfluorosulfonimide and lithium tetrafluoroborate.

Embodiment 3

[0022] The lithium-ion battery electrolyte provided in this embodiment includes 85% organic solvent; 12% electrolyte and 3% additive. Wherein the additives include 55% additive one and 45% additive two, additive one includes 1,3-propane sultone, additive two is divinyl fluorobenzene; organic solvent consists of 60% solvent one and 40% solvent A combination of two, the solvent one is 1:1 methyl propyl carbonate and ethyl acetate, the second solvent is ethylene carbonate; the electrolyte includes 99% lithium hexafluorophosphate, and the balance is 1:1.5 lithium difluorooxalate borate and bistri Lithium fluoromethanesulfonyl imide.

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PUM

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Abstract

The invention discloses novel lithium-ion battery electrolyte. The novel lithium-ion battery electrolyte comprises the following components in percent by weight: 75 to 85 percent of an organic solvent; 9 to 20 percent of electrolyte; 1 to 10 percent of an additive; the additive comprises 50 to 60 percent of an additive I and 40 to 50 percent of an additive II; the additive II is divinyl fluorobenzene. The novel lithium-ion battery electrolyte can improve the circulation performance, has excellent flame resistance, and further improves the service life of a battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte solution for lithium batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high specific energy, no pollution, no memory effect and long life, and are widely used in portable electrical devices such as mobile phones, digital cameras and notebook computers. Lithium battery electrolyte is the carrier of ion transmission in the battery. It is generally composed of lithium salt and organic solvent. The electrolyte plays the role of conducting ions between the positive and negative electrodes of the lithium battery. It is the lithium ion battery to obtain high voltage, high specific energy, etc. Advantages guaranteed. The electrolyte is generally prepared from high-purity organic solvents, electrolyte lithium salts, necessary additives and other raw materials under certain conditions and in a certain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 郭营军张和平路伯倩李新丽
Owner XIANGHE KUNLUN NEW ENERGY MATERIALS CO LTD