A kind of lithium battery electrolyte additive, electrolyte and lithium battery

An electrolyte additive, lithium battery technology, applied in the field of electrolyte and lithium battery, lithium battery electrolyte additive, can solve the problem that the battery is prone to bulging, affect the cycle life and safety performance of the lithium ion battery, and accelerate the decomposition of lithium in the anolyte solution. Dendrite growth and other problems, to achieve good hygroscopicity, increase solid content, and improve the effect of cycle capacity

Active Publication Date: 2021-04-16
贵州光瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium hexafluorophosphate is a commonly used electrolyte in lithium-ion batteries, but it is easy to decompose under water vapor and high temperature conditions, producing hydrogen fluoride and phosphorus fluoride gas, and the battery is prone to bulging, HF will gradually corrode the cathode and current collector, resulting in the dissolution of transition metal ions -Migration-deposition process, accelerating the decomposition of anolyte and the growth of lithium dendrites, affecting the cycle life and safety performance of lithium-ion batteries

Method used

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  • A kind of lithium battery electrolyte additive, electrolyte and lithium battery

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Embodiment 1

[0033] Preparation of lithium battery electrolyte additives: (1) Mix urethane acrylate and acrylic acid monomers at a mass ratio of 1:1; (2) Add 5% paraffin and 2% diatomaceous earth to the mixture in step (1) Mix well; (3) Add 2,2-dimethoxy-2-phenylacetophenone (3% of the total mass of urethane acrylate and acrylic acid monomer) and graphite powder to the mixture obtained in step (2) 0.1%, mix uniformly and then granulate; (4) Add 1% of the lithium halide-diatomite-graphite mixture to the product obtained after step (3) and mix uniformly (to make the lithium halide-diatomite-graphite mixture adhere to on the surface of the particles); (5) cured under ultraviolet light to obtain the lithium battery electrolyte additive.

[0034] Among them: (1) The amount of each raw material mentioned above is calculated based on the total mass of urethane acrylate and acrylic acid monomer;

[0035] (2) The above steps (1)-(4) are all carried out under dark conditions, and steps (3)-(4) shou...

Embodiment 2

[0038] Preparation of lithium battery electrolyte additives: (1) Mix polyurethane acrylate and acrylic acid monomers at a mass ratio of 1:1; (2) Add 3% paraffin and 0.5% diatomaceous earth to the mixture in step (1) Mix well; (3) Add 2,2-dimethoxy-2-phenylacetophenone (4% of the total mass of polyurethane acrylate and acrylic acid monomer) and graphite powder to the mixture obtained from step (2) (4) Add 0.5% of the lithium halide-diatomaceous earth-graphite mixture to the product obtained after step (3) and mix uniformly (to make the lithium halide-diatomite-graphite mixture adhere to on the surface of the particles); (5) cured under ultraviolet light to obtain the lithium battery electrolyte additive.

[0039] Among them: (1) The amount of each raw material mentioned above is calculated based on the total mass of urethane acrylate and acrylic acid monomer;

[0040] (2) The above steps (1)-(4) are all carried out under dark conditions, and steps (3)-(4) should be completed i...

Embodiment 3

[0043]Preparation of lithium battery electrolyte additives: (1) Mix polyurethane acrylate and acrylic acid monomers at a mass ratio of 1:1; (2) Add 8% paraffin and 1.5% diatomaceous earth to the mixture in step (1) Mix well; (3) Add 2,2-dimethoxy-2-phenylacetophenone (5% of the total mass of polyurethane acrylate and acrylic acid monomer) and graphite powder to the mixture obtained from step (2) 0.2%, mix uniformly and then granulate; (4) Add 1.5% of the lithium halide-diatomite-graphite mixture to the product obtained after step (3) and mix uniformly (to make the lithium halide-diatomite-graphite mixture adhere to on the surface of the particles); (5) cured under ultraviolet light to obtain the lithium battery electrolyte additive.

[0044] Among them: (1) The amount of each raw material mentioned above is calculated based on the total mass of urethane acrylate and acrylic acid monomer;

[0045] (2) The above steps (1)-(4) are all carried out under dark conditions, and steps...

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Abstract

The invention belongs to the technical field of batteries, and in particular relates to an electrolyte additive for a lithium battery, an electrolyte and a lithium battery. The lithium battery electrolyte additive is prepared according to the following method: (1) uniformly mix polyurethane acrylate and acrylic acid monomer; (2) add paraffin and diatomaceous earth to the mixture obtained in step (1) and mix uniformly ; (3) Add 2,2-dimethoxy-2-phenylacetophenone and graphite powder to the mixture obtained after step (2), mix well and then granulate; Add lithium halide-diatomaceous earth-graphite mixture to the product obtained after treatment and mix uniformly; (5) solidify under ultraviolet light irradiation to obtain the lithium battery electrolyte additive. The lithium battery electrolyte additive can significantly improve the cycle capacity retention rate of the battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte additive for a lithium battery, an electrolyte and a lithium battery. Background technique [0002] Lithium battery electrolyte is the carrier of ion transport in the battery. Generally composed of lithium salt and organic solvent. The electrolyte plays the role of conducting ions between the positive and negative electrodes of the lithium battery, which is the guarantee for the high voltage and high specific energy of the lithium ion battery. The electrolyte is generally composed of high-purity organic solvents (such as ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, and ethyl methyl carbonate, etc.), electrolyte lithium salts (such as lithium hexafluorophosphate, lithium perchlorate, tetrafluoro Lithium borate, etc.), necessary additives (such as film-forming additives, conductive additives, flame-retardant additive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 徐珂蔡寒玉冀盛亚赵敬云
Owner 贵州光瑞新能源科技有限公司
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