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Non-aqueous electrolyte for high-voltage lithium ion batteries

A non-aqueous electrolyte and lithium-ion battery technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems of low inflation rate, achieve high performance, increase decomposition voltage, and improve cycle performance

Active Publication Date: 2013-08-28
广东金光高科股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of matching the electrolyte of lithium-ion batteries with the positive and negative electrodes of high-voltage (especially 4.35 V high-voltage) batteries, and provide a high-voltage battery with high cycle life, low inflation rate, and good high-temperature performance with electrolyte

Method used

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  • Non-aqueous electrolyte for high-voltage lithium ion batteries
  • Non-aqueous electrolyte for high-voltage lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Preparation of non-aqueous electrolyte: at room temperature, in a glove box with dry air (moisture <20PPM), accurately weigh 31.76 grams of ethylene carbonate, 37.70 grams of diethyl carbonate, and 7.94 grams of ethyl methyl carbonate with an electronic balance , vinylene carbonate 1.50 g, 1,3-propane sultone 2.50 g, fluoroethylene carbonate 4.00 g, succinonitrile: 1.00 g, lithium tetrafluoroborate: 1.00 g, hexamethyldisilazane 0.02 grams, 0.08 grams of trimethyl phosphite and 12.50 grams of lithium hexafluorophosphate; then add the above-mentioned various raw materials into a conical flask with a ground mouth, and stir until lithium hexafluorophosphate is completely dissolved, and the organic solvents are mixed uniformly to obtain 100 grams of non-aqueous electrolyte.

Embodiment 2

[0046] The preparation method of this example is the same as Example 1, except that the raw materials used are 30.26 grams of ethylene carbonate, 23.82 grams of dimethyl carbonate, 23.82 grams of ethyl methyl carbonate, 1.00 grams of vinyl vinylene carbonate, 1,4-butane Sultone 2.00 g, adiponitrile: 3.00 g, difluoroethylene carbonate: 2.00 g, lithium bisoxalate borate 1.5 g, heptamethyldisilazane 0.04 g, trimethyl phosphite 0.06 g and lithium hexafluorophosphate 12.50 gram.

Embodiment 3

[0048] The preparation method of this example is the same as Example 1, except that the raw materials used are 15.68 grams of ethylene carbonate, 45.54 grams of dimethyl carbonate, 15.68 grams of propylene carbonate, 2.00 grams of vinylene carbonate, 1,4-butane sultone 2.00 g, succinonitrile 2.00 g, difluoroethylene carbonate: 3.00 g, lithium difluorooxalate borate 1.5 g, heptamethyldisilazane 0.03 g, triphenyl phosphite 0.07 g and lithium hexafluorophosphate 12.50 g.

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Abstract

The invention relates to a non-aqueous electrolyte for high-voltage lithium ion batteries, which is prepared from the following raw materials in percentage by weight: 70-85% of carbonate, 3-20% of functional additive and 11-17% of lithium hexafluorophosphate. The carbonate is one or mixture of more of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylethyl carbonate, methyl propyl carbonate and methyl butyl carbonate; and the functional additive is one or mixture of more of 0.5-10% of negative pole film-forming additive, 0.5-10% of high-temperature additive, 0.5-10% of positive pole film-forming additive, 0.5-10% of high-voltage additive and 0.001-2% of stability additive. The invention solves the problem of adaptation of the lithium ion battery electrolyte to the 4.35V high-voltage battery positive / negative pole, and provides an electrolyte for high-voltage batteries, which has the advantages of high cycle life, low inflation rate and favorable high-temperature properties.

Description

technical field [0001] The invention relates to a nonaqueous electrolytic solution for a high-voltage lithium-ion battery, in particular to a non-aqueous electrolytic solution for a 4.35V high-voltage lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in notebook computers, mobile phones, digital cameras, mp3 players and other small electronic equipment and medical equipment as driving power sources due to their superior performance since their birth and commercialization. In recent years, with the rapid development of high-performance and multi-functional portable devices, higher requirements have been placed on the capacity and capacity density of lithium-ion batteries. Increasing the operating voltage of lithium-ion batteries is considered to be the most effective way to increase their energy density. At present, positive electrode materials that can be applied at high voltages have been developed, mainly coated with lithium co...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCY02E60/10
Inventor 许日勤
Owner 广东金光高科股份有限公司
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