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Non-aqueous electrolyte for lithium manganate power battery

A non-aqueous electrolyte and power battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor cycle life of lithium manganate batteries, improve cycle performance and safety performance, increase cycle life, and improve safety effect

Active Publication Date: 2012-07-25
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 poor cycle life of lithium manganate batteries, and provide a high cycle life and high safety electrolyte solution for lithium manganate power batteries that can be used for electric vehicles, electric bicycles and other electric tools

Method used

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  • Non-aqueous electrolyte for lithium manganate power battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] 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, 38.70 grams of diethyl carbonate, and 7.94 grams of ethyl methyl carbonate with an electronic balance , vinylene carbonate 1.00 g, 1,3-propane sultone 2.00 g, cyclohexylbenzene 2.00 g, dimethyl methyl phosphate: 3.00 g, hexamethyldisilazane 0.02 g, trimethyl phosphite 0.08 g of ester and 12.50 g of lithium hexafluorophosphate; then add the above-mentioned various raw materials into a Erlenmeyer flask with a ground mouth, and stir until lithium hexafluorophosphate is completely dissolved, and each organic solvent is mixed evenly to obtain 100 grams of non-aqueous electrolyte.

Embodiment 2

[0043] The preparation method of this example is the same as Example 1, except that the raw materials used are 31.76 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 2.00 g of sultone, 3.00 g of biphenyl, 2.00 g of trimethyl phosphate, 0.04 g of heptamethyldisilazane, 0.06 g of trimethyl phosphite and 12.50 g of lithium hexafluorophosphate.

Embodiment 3

[0045] 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, 47.04 grams of dimethyl carbonate, 15.68 grams of propylene carbonate, 2.00 grams of vinylene carbonate, 1,4-butane sultone 2.00 g, cyclohexylbenzene 2.00 g, trimethyl phosphate: 3.00 g, heptamethyldisilazane 0.03 g, triphenyl phosphite 0.07 g and lithium hexafluorophosphate 12.50 g.

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Abstract

The invention discloses non-aqueous electrolyte for a lithium manganate power battery. The non-aqueous electrolyte comprises 70-90% of carbonic ester compound, 3-20% of various functional additives and 11-17% of lithium hexafluorophate, wherein the carbonic ester compound is one of or mixture of ethylene carbonate (EC), propylene carbonate (PC), butane carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl ethyl carbonate (EMC), methyl propyl carbonate (MPC) and methyl butyl carbonate (BMC); and the additives comprise 0.5-10% of a film forming additive, 0.5-10% of a high-temperature additive, 0.5-10% of an anti-overcharge additive, 0.5-10% of a flame retardant additive and 0.001-2% of a stability additive. In the non-aqueous electrolyte for the lithium manganate power battery of the invention, the performance of a solid phase interfacial film in the battery is improved, the compatibility of the electrolyte with negative electrode material is enhanced, and the cycle performance as well as the safety performance of the battery is greatly improved.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium ion battery, in particular to a nonaqueous electrolyte solution for a lithium ion battery using lithium manganate as a positive electrode material. 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 gradual depletion of fossil fuels, mankind is facing an unprecedented energy crisis, and the research on electric vehicles is imperative. In the existing material system, lithium manganese oxide cathode material is widely used in electric vehicles or low-speed electric bicycles because of its low price, non-toxic environmental protection, and good safety performance. However, lithium manganate also has a key disadvantage, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 许日勤
Owner 广东金光高科股份有限公司
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