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Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in non-aqueous electrolytes, battery electrodes, secondary batteries, etc., can solve the problems of poor cycle performance and high-temperature storage performance

Active Publication Date: 2021-09-17
天津新宙邦电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of residual moisture influence, cycle performance, and poor high-temperature storage performance in existing lithium-ion batteries, the present invention provides a non-aqueous electrolyte for lithium-ion batteries and a lithium-ion battery to improve the cycle performance of lithium-ion batteries and high temperature storage performance

Method used

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  • Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery

Examples

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Embodiment 1

[0052] This example is used to illustrate the preparation method of a non-aqueous electrolyte solution and a lithium-ion battery disclosed in the present invention.

[0053] 1) Preparation of non-aqueous electrolyte

[0054] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, and then add 1% of compound 1 based on the total mass of the electrolyte.

[0055] 2) Preparation of positive plate

[0056] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then the mixture was dispersed in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The positive electrode slurry is evenly coated on both sides of the aluminum foil, aft...

Embodiment 2-16

[0064] Embodiment 2-16, comparative example 1-12

[0065] Repeat the steps of Example 1, the difference is that the components and their contents in Examples 2-16 and Comparative Examples 1-12 are shown in Table 1.

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Abstract

In order to overcome the problems of residual moisture influence, poor cycle performance and high-temperature storage performance in existing lithium-ion batteries, the invention provides a non-aqueous electrolyte for lithium-ion batteries, including solvents, lithium salts and maleic anhydride copolymers , the weight average molecular weight of the maleic anhydride copolymer is less than or equal to 500,000; and, based on the total mass of the non-aqueous electrolyte solution as 100%, the mass percentage of the maleic anhydride copolymer is more than 0.5%. At the same time, the present invention also provides a lithium ion battery comprising the above-mentioned non-aqueous electrolyte. The non-aqueous electrolytic solution provided by the invention is added with a maleic anhydride copolymer with a weight average molecular weight of 0.5% or more and a weight average molecular weight of 500,000 or less, so that the high-temperature storage and cycle performance of the lithium-ion battery are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nonaqueous electrolytic solution for lithium ion batteries and a lithium ion battery. Background technique [0002] Due to its high operating voltage, high safety, long life, and no memory effect, lithium-ion batteries are currently mainly used in the fields of 3C digital consumer electronics products, new energy vehicles and energy storage. With the continuous improvement of the mileage requirements of new energy vehicles and the continuous miniaturization of digital consumer electronics products, high energy density has become the main development trend of lithium-ion batteries, and increasing the working voltage of lithium-ion batteries has become the key to improving battery energy density. Effective Ways. The improvement of the working voltage of the lithium-ion battery can increase the energy density of the battery, but at the same time, the imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M10/0565H01M2300/0085H01M4/131H01M4/136H01M4/505H01M4/525H01M4/5825Y02E60/10H01M2300/0025
Inventor 石桥胡时光艾关杰林木崇
Owner 天津新宙邦电子材料有限公司