Electrolyte for improving high temperature performance of lithium manganate power battery and lithium manganate power battery

A power battery and high-temperature performance technology, which is applied in the field of lithium-ion power batteries, can solve the problems of positive electrode loss of activity and poor cycle performance of lithium manganate batteries, and achieve the effects of suppressing capacity decay, significant water removal effect, and improving high-temperature cycle performance Effect

Inactive Publication Date: 2014-08-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dissolution of manganese at normal temperature is not great, the dissolution of manganese is accelerated at high temperature. The main reason is that the reaction of

Method used

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  • Electrolyte for improving high temperature performance of lithium manganate power battery and lithium manganate power battery
  • Electrolyte for improving high temperature performance of lithium manganate power battery and lithium manganate power battery
  • Electrolyte for improving high temperature performance of lithium manganate power battery and lithium manganate power battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] At room temperature, in a glove box filled with argon (moisture 6 ) 24g; respectively take out EC, EMC, DEC and pour into a beaker placed on a magnetic stirrer, control the stirring rate and then add LiPF to the solvent system in turn 6 , LiBOB, LiFSI are stirred for 5-10 minutes until the lithium salt is completely dissolved, then weigh the high-temperature additives, film-forming additives, surfactants and stabilizers to be removed and add them to the beaker in turn, and continue to stir until the mixture is evenly mixed to obtain 300g of non-aqueous electrolyte.

[0042] Using spinel lithium manganate as the positive electrode material, the metal lithium sheet as the negative electrode, the Celgard 2300 microporous polypropylene membrane as the separator, and the prepared sample as the electrolyte, assembled in a glove box with a relative humidity of less than 5% and full of argon gas. The CR2025 button cell is then placed in a vacuum drying oven for 12...

Example Embodiment

[0043] Example 2

[0044] Except for replacing 3g of ethylene carbonate (VC) with 1.5g of vinyl acetate (VA) and 1.5g of ethylene carbonate (VC), and replacing 0.0015g of hexamethyldisilazane with 0.0015g of heptamethyldisilazane, Except that 6g of lithium bisoxalate borate (LiBOB) was changed to 6g of LiODFB, an electrolyte sample was obtained in the same manner as in Example 1 and the battery was tested.

Example Embodiment

[0045] Example 3

[0046] In addition to replacing 3g of ethylene carbonate (VC) with 1.5g of vinyl acetate (VA) and 1.5g of ethylene carbonate (VC), 3g of methylene disulfonate (MMDS) was replaced with methylene disulfonate ( MMDS) 1.5g and p-toluenesulfonic acid isocyanate (PTSI) 1.5g, lithium iodide (LiI) 0.0015g replaced with lithium sulfite (Li 2 SO 3 ) 0.0015g, except that 6g of lithium bisoxalate borate (LiBOB) is replaced with 6g of LiODFB, an electrolyte sample is obtained in the same manner as in Example 1 and the battery is tested.

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Abstract

The invention provides an electrolyte for improving high temperature performance of a lithium manganate power battery and the lithium manganate power battery. The electrolyte comprises the following components: 75wt%-88wt% of non-aqueous organic solvent, 10wt%-17wt% of lithium salt, 0.5wt%-6wt% of film forming additive, 0.5wt%-5wt% of high temperature additive, 0.5wt%-3wt% of surfactant and 0.001wt%-1wt% of stabilizing agent; the electrolyte is capable of inhibiting the capacity reduction of spinel LiMn2O4 under high temperature through control of proportion of non-aqueous organic solvent, application of combination of LiPF6 and novel lithium salt, and addition of the film forming additive, the high temperature additive, the surfactant and the stabilizing agent which have cooperative effect. The high temperature cycle performance of the lithium manganate power battery by using the electrolyte can be obviously increased.

Description

technical field [0001] The invention belongs to the field of lithium-ion power batteries, and in particular relates to an electrolyte solution for improving the high-temperature performance of a lithium manganate power battery and the lithium manganate power battery. Background technique [0002] Due to the advantages of relatively high energy density, small self-discharge, no memory effect, long cycle life and environmental friendliness, lithium-ion secondary batteries are widely used in various portable electronic products and communication tools. In recent years, the rapid development of the automobile industry has also exacerbated the crisis of energy and environment. According to statistics, 63% of air pollution comes from fuel vehicles, which prompts the country to increase research and development of electric vehicles and hybrid vehicles. Lithium-ion secondary batteries will have very important application prospects in electric vehicles and energy storage equipment. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525H01M10/42
CPCY02E60/122H01M10/0525H01M10/0567H01M10/0568H01M2300/0025H01M2300/0028Y02E60/10
Inventor 李新海王任衡王志兴郭华军黄斌王接喜胡启阳彭文杰张云河
Owner CENT SOUTH UNIV
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