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Lithium ion battery electrolyte and lithium ion battery

A technology of lithium ion battery and electrolyte, applied in the field of lithium ion battery electrolyte and lithium ion battery, can solve the problems of deterioration of stability, destruction of positive electrode material, deterioration of cycle and storage performance, etc. The effect of high voltage

Inactive Publication Date: 2017-12-22
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the high-voltage positive electrode material is charged, lithium is released, its oxidation property is enhanced, and its stability is deteriorated. On the one hand, the electrolyte is oxidized, and on the other hand, the transition metal of the positive electrode material dissolves, which destroys the positive electrode material, resulting in its cycle and storage performance. Deterioration, which is more obvious in high temperature environment

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1. Electrolyte preparation:

[0039] In an inert gas environment with moisture <5ppm, mix ethylene carbonate, propylene carbonate, ethyl propionate, and propyl propionate uniformly in a weight percentage of 30:15:20:35. Then, lithium hexafluorophosphate is added, and the mass concentration of lithium hexafluorophosphate in the electrolyte is 14%. Then add functional additives: adiponitrile (ADN) as a positive electrode protection additive, 1,3-propane sultone (PS) and fluoroethylene carbonate (FEC) as a film-forming additive. Wherein the addition of adiponitrile is 1% of the total mass of the electrolyte, the addition of 1,3-propane sultone is 3% of the total mass of the electrolyte, and the addition of fluoroethylene carbonate is 1% of the total mass of the electrolyte. 5%. Finally, vinyl sulfate (DTD) was added as a low-impedance additive in an amount of 0.5% of the total mass of the electrolyte. After stirring evenly, an electrolyte sample was obtained.

[0040] ...

Embodiment 2

[0062] Basically the same as Example 1, the difference is that the weight ratio between ethylene carbonate, propylene carbonate, ethyl propionate, and propyl propionate in the solvent is 30:10:20:40, and the consumption of organic solvent According to the change in the amount of functional additives, the corresponding increase or decrease, the additives and the amount of adiponitrile added to account for 2% of the total mass of the electrolyte, the amount of 1,3-propane sultone added to account for 2% of the total mass of the electrolyte %, the addition of vinylene carbonate is 2.5% of the total mass of the electrolyte, and the addition of vinyl sulfate is 1% of the total mass of the electrolyte.

Embodiment 3

[0064] Basically the same as Example 1, the difference is that the weight ratio between ethylene carbonate, propylene carbonate, ethyl propionate, and diethyl carbonate in the solvent is 30:15:20:35, and the consumption of organic solvent According to the change of the amount of functional additives, the amount of adiponitrile added is 2% of the total mass of the electrolyte, and the amount of 1,3-propane sultone is 2.5% of the total mass of the electrolyte. The amount of ethylene carbonate added is 4% of the total mass of the electrolyte, and the amount of vinyl sulfate added is 1% of the total mass of the electrolyte.

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PUM

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Abstract

The invention discloses lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte is prepared from 11 to 17 weight percent of lithium salt, 3 to 11 weight percent of a functional additive and 78 to 85 weight percent of an organic solvent, wherein the functional additive comprises an anode protection additive, a film forming additive and a low-resistance additive; furthermore, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, ethyl propionate, propyl propionate, ethyl methyl carbonate and diethyl carbonate. The lithium ion battery electrolyte disclosed by the invention is high-voltage and high-temperature-resistant rate type lithium ion battery electrolyte, and can meet the high-current discharge cycle performance of a high-voltage lithium ion battery and also meet a storage performance requirement under a high-temperature condition.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] With the expansion of the application field of lithium-ion batteries, the requirements for battery performance are also increasing. In some market areas, such as the UAV market, the electrical performance requirements for batteries are also more detailed: high energy density, high current rate discharge cycle performance and high temperature storage performance. [0003] One of the directions to achieve high energy density is to use high-voltage cathode materials. However, as the high-voltage positive electrode material is charged, lithium is released, its oxidation property is enhanced, and its stability is deteriorated. On the one hand, the electrolyte is oxidized, and on the other hand, the transition metal of the positive electrode material dissolves, which destroys the positive electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 曹少军石文静王铮铮占克军张胜强李奇
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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