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High-nickel ternary lithium battery electrolyte with cycling stability

A ternary lithium battery and electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of poor cycle performance of batteries, improve withstand voltage performance, reduce workload, and solve compatibility problems Effect

Inactive Publication Date: 2018-08-21
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problem of poor cycle performance of the existing high-nickel ternary system lithium battery, the present invention proposes a cycle-stable high-nickel ternary lithium battery electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-nickel ternary lithium battery electrolyte with stable circulation, the electrolyte includes 30 parts by weight of organic solvent glutaronitrile, 15 parts by weight of bis(trifluoromethylsulfonyl)imide lithium, 8 parts by weight of additives ; The additive is prepared after mixing dimethylaminoanisole, 4'-aminobenzo-15-crown 5-ether and sorbitol polyoxyethylene ether hexastearate according to the mass ratio of 5:5:8 made.

[0029] The preparation method of the high-nickel ternary lithium battery electrolyte with stable circulation comprises the following steps: dimethylaminoanisole, 4'-aminobenzo-15-crown 5-ether and sorbitol polyoxyethylene ether hexahard The fatty acid ester is mixed according to a mass ratio of 5:5:8 to prepare an additive composition; the organic solvent, lithium salt, and additive mixture are fully stirred at 25° C. to obtain an electrolyte.

[0030] Aluminum shell battery is selected, in the positive plate, m (811 type nickel cobalt lithi...

Embodiment 2

[0033] A cyclically stable high-nickel ternary lithium battery electrolyte, the electrolyte includes 20 parts by weight of organic solvent dicyandiamide, 10 parts by weight of lithium bistrifluoromethanesulfonylimide, and 4 parts by weight of additives; The additive is prepared by mixing dimethylaminoanisole, 4'-aminobenzo-15-crown 5-ether and sorbitol polyoxyethylene ether hexastearate in a mass ratio of 4:4:9.

[0034] The preparation method of the high-nickel ternary lithium battery electrolyte with stable circulation comprises the following steps: dimethylaminoanisole, 4'-aminobenzo-15-crown 5-ether and sorbitol polyoxyethylene ether hexahard The fatty acid ester is mixed according to the mass ratio of 4:4:9 to prepare an additive composition; the organic solvent, lithium salt, and additive mixture are fully stirred at 25° C. to obtain an electrolyte.

[0035] Aluminum shell battery is selected, in the positive plate, m (811 type nickel cobalt lithium manganese oxide): m (...

Embodiment 3

[0038] A high-nickel ternary lithium battery electrolytic solution with stable circulation, the electrolytic solution comprises the organic solvent acetonitrile of 24 parts by weight, the bis(trifluoromethylsulfonyl)imide lithium of 12 parts by weight, the additive of 6 parts by weight; The additive is prepared by mixing dimethylaminoanisole, 4'-aminobenzo-15-crown 5-ether and polyoxyethylene sorbitol hexastearate in a mass ratio of 4:5:12 .

[0039] The preparation method of the high-nickel ternary lithium battery electrolyte with stable circulation comprises the following steps: dimethylaminoanisole, 4'-aminobenzo-15-crown 5-ether and sorbitol polyoxyethylene ether hexahard The fatty acid ester is mixed according to the mass ratio of 4:5:12 to prepare an additive composition; the organic solvent, lithium salt, and additive mixture are fully stirred at 25° C. to obtain an electrolyte.

[0040] Aluminum shell battery is selected, in the positive plate, m (811 type nickel coba...

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PUM

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Abstract

The invention belongs to the technical field of preparation of a ternary battery electrolyte, and particularly relates to a high-nickel ternary lithium battery electrolyte with cycling stability. According to the high-nickel ternary lithium battery electrolyte, an additive of the electrolyte is a mixture of dimethylaminoanisole, 4'-aminobenzo-15-crown-5-ether and sorbeth-n hexastearate, and by means of sorbeth-n hexastearate, the phenomenon of poor electrolyte infiltration caused by blockage by degradation products, breakage of battery cathode pores due to charge and discharge and the like canbe eliminated, so that cycle performance of a battery is improved; OCH3 of dimethylaminoanisole is subjected to a reaction of a solvolyte, LiOCH3 is generated, and an efficient and stable SEI (solidelectrolyte interface) film is formed; wrapped chelate is formed by 4'-aminobenzo-15-crown-5-ether and lithium ions, solubility of lithium salt can be improved, and effective separation of anion-cation pairs and separation of lithium ions and solvent molecules are realized; under the joint action of dimethylaminoanisole, 4'-aminobenzo-15-crown-5-ether and sorbeth-n hexastearate, the cycle performance of the electrolyte is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of ternary battery electrolyte, in particular to a high-nickel ternary lithium battery electrolyte. Background technique [0002] Ternary materials (nickel cobalt lithium manganese oxide) increasing the nickel content can greatly increase the specific capacity of the material, so high nickel ternary materials must be an ideal material for large batteries in the future. [0003] Cycling performance is particularly important to the performance of Li-ion batteries; longer cycle life means less resource consumption. Therefore, the factors that affect the cycle performance of lithium-ion batteries can be roughly divided into: 1. The type of material. The selection of materials is the first factor that affects the performance of lithium-ion batteries. The cycle performance of the material is poor. On the one hand, it may be that the crystal structure changes too fast during the cycle to continue to...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568
CPCH01M10/0566H01M10/0567H01M10/0568Y02E60/10
Inventor 陈庆赵海林
Owner CHENDU NEW KELI CHEM SCI CO LTD
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