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Electrolyte improving high temperature performance of battery, and lithium ion battery

A high-temperature performance, electrolyte technology, used in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor battery durability, and the high and low temperature cycle performance and stability of batteries have not been greatly improved. The effect of improving high temperature performance

Inactive Publication Date: 2016-11-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention reduces the impedance of the battery during cycling by changing the lithium salt in the electrolyte of the lithium-ion battery and adding a certain amount of film-forming additives, but the high-low temperature cycle performance and stability of the battery have not been greatly improved. Poor battery durability

Method used

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  • Electrolyte improving high temperature performance of battery, and lithium ion battery
  • Electrolyte improving high temperature performance of battery, and lithium ion battery
  • Electrolyte improving high temperature performance of battery, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Electrolyte preparation: 1 mol / LLiTFSI electrolyte was prepared according to the volume ratio of FEC:PC:DEC:EMC=35:5:35:25.

[0025] (2) Preparation of positive electrode material: NCM523 (nickel-cobalt-manganese ternary material) + LFMP (lithium iron manganese phosphate) (7:3, positive electrode active material) with a weight percentage of 91% mixed with 4% by weight SP (superconducting carbon black) and PVDF (bonding agent) of 5% by weight, and add N-methylpyrrolidone to it to make slurry, slurry is coated on the aluminum foil, rolls after drying, Obtain the positive electrode material.

[0026] (3) Preparation of negative electrode material: mixing artificial graphite of 75% by weight, mesophase carbon microspheres of 20% by weight, sodium carboxymethyl cellulose of 5% by weight, and adding deionized water, and then coating the slurry on a copper foil, drying and rolling to obtain the negative electrode material.

[0027] (4) The above-mentioned positive and ne...

Embodiment 2

[0030] (1) Electrolyte preparation: add 2% of total weight of VC, 1% of total weight of water remover, prepare 1mol / L LiTFSI electrolysis according to FEC:PC:DEC:EMC=35:5:35:25 (volume ratio) liquid.

[0031] (2) Preparation of positive electrode material: NCM523+LFMP (7:3, positive electrode active material) of mixed weight percentage 91%, SP (superconducting carbon black) of weight percentage 4% and weight percentage 5% PVDF (binder), and N-methylpyrrolidone was added to it to make a slurry, the slurry was coated on an aluminum foil, dried and rolled to obtain the positive electrode material.

[0032] (3) Preparation of negative electrode material: mixing artificial graphite of 75% by weight, mesophase carbon microspheres of 20% by weight, sodium carboxymethyl cellulose of 5% by weight, and adding deionized water, and then coating the slurry on a copper foil, drying and rolling to obtain the negative electrode material.

[0033] (4) The above-mentioned positive and negativ...

Embodiment 3

[0036] (1) Electrolyte preparation: add VC of 2% of total weight, MMDS of 1% of total weight, and water remover of 1% of total weight, according to FEC:PC:DEC:EMC=35:5:35:25 (volume ratio ) to prepare 1mol / L LiTFSI electrolyte.

[0037] (2) Preparation of positive electrode material: NCM523+LFMP (8:2, positive electrode active material) of mixed weight percentage 91%, SP (superconducting carbon black) of weight percentage 4% and weight percentage 5% PVDF (binder), and N-methylpyrrolidone was added to it to make a slurry, the slurry was coated on an aluminum foil, dried and rolled to obtain the positive electrode material.

[0038](3) Preparation of negative electrode material: mixing artificial graphite of 75% by weight, mesophase carbon microspheres of 20% by weight, sodium carboxymethyl cellulose of 5% by weight, and adding deionized water, and then coating the slurry on a copper foil, drying and rolling to obtain the negative electrode material.

[0039] (4) The above-men...

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Abstract

The present invention discloses an electrolyte improving high temperature performance of a battery, and a lithium ion battery. The electrolyte comprises a lithium salt, a non-aqueous solvent, a film formation additive, and a dehydrator. The chemical formula of the lithium salt is as shown in the specification, wherein R1, R2 and R3 are any one of alkyl, alkoxy carbonyl, alkyl sulfonyl, alkenyl, and a halogen atom with 1-12 carbon atoms. According to the electrolyte, the novel lithium salt, the film formation additive and the dehydrator play a synergetic role, so that lithium manganese iron phosphate is inhibited from absorbing water so as not to lead to the fact that the electrolyte is decomposed and generates air and metal ions of a ternary material precipitate , which affects the high temperature performance of the battery. The ternary mixed manganese iron phosphate lithium battery using the electrolyte has good high temperature cycle performance and high temperature storage performance. The high temperature performance is improved, so that the high and low temperature stability performance is improved, the high and low temperature security is ensured, the application range of the lithium ion battery is enlarged, and the product competitiveness is improved.

Description

technical field [0001] The invention belongs to the technical field of battery testing equipment, and in particular relates to an electrolyte and a lithium-ion battery for improving the high-temperature performance of the 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. [0003] At present, lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0567H01M10/0525H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10
Inventor 卫友亮梁大宇包婷婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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