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Non-aqueous electrolyte of lithium ion battery and application of non-aqueous electrolyte

A lithium-ion battery, non-aqueous electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of damage, instability, uneven SEI film, etc., to promote transmission, enhance the electron-donating effect, Effect of Optimizing High-Temperature Cycle Performance

Pending Publication Date: 2021-12-17
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SEI films suffer from inhomogeneity, damage during cycling, and instability

Method used

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  • Non-aqueous electrolyte of lithium ion battery and application of non-aqueous electrolyte
  • Non-aqueous electrolyte of lithium ion battery and application of non-aqueous electrolyte
  • Non-aqueous electrolyte of lithium ion battery and application of non-aqueous electrolyte

Examples

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Embodiment 1

[0066] This embodiment provides a non-aqueous electrolyte solution for lithium-ion batteries. Based on the total mass of the non-aqueous electrolyte solution as 100%, the lithium-ion non-aqueous electrolyte solution includes a fourth compound with a mass percentage of 2.5%. 2.5% of vinylene carbonate, 2.5% of 1,3-propane sultone and 5% of vinyl sulfate additives, lithium salts include lithium hexafluorophosphate with a concentration of 1mol / L and 2.5% by mass Lithium difluorophosphate, 2.5% lithium difluorosulfonyl imide and 5% lithium difluorophosphate oxalate, the balance is a non-aqueous solvent, and the non-aqueous solvent is composed of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate Composition by mass ratio is 3:5:2.

[0067] The preparation method of the lithium-ion battery non-aqueous electrolyte is as follows: the electrolyte is prepared in a glove box, the nitrogen content in the glove box is 99.999%, the actual oxygen content in the glove box is 0....

Embodiment 2

[0075] This embodiment provides a non-aqueous electrolyte solution for lithium-ion batteries. Based on the total mass of the non-aqueous electrolyte solution as 100%, the lithium-ion non-aqueous electrolyte solution includes the fourth compound, 0.025% of vinylene carbonate and 0.025% of 1,3-propane sultone additives, the lithium salt is lithium hexafluorophosphate with a concentration of 0.5mol / L and 5% by mass of lithium difluorophosphate, 5 % lithium bisfluorosulfonyl imide and 10% lithium difluorooxalate phosphate, the balance is a non-aqueous solvent, and the non-aqueous solvent is 3 by mass ratio of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate: 5:2 composition.

[0076] The preparation method of the lithium-ion battery non-aqueous electrolyte is as follows: the electrolyte is prepared in a glove box, the nitrogen content in the glove box is 99.999%, the actual oxygen content in the glove box is 0.1ppm, and the moisture content is 0.1ppm. Based on the...

Embodiment 3

[0079] This embodiment provides a non-aqueous electrolyte solution for lithium-ion batteries. Based on the total mass of the non-aqueous electrolyte solution as 100%, the lithium-ion non-aqueous electrolyte solution includes a fourth compound with a mass percentage of 5%, 5% of vinylene carbonate, 10% of 1,3-propane sultone and 5% of vinyl sulfate additives, the concentration of lithium salt includes 2mol / L lithium hexafluorophosphate and 0.025% by mass Lithium difluorophosphate and 0.025% lithium bisfluorosulfonyl imide, the balance is a non-aqueous solvent, and the non-aqueous solvent is composed of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate in a mass ratio of 3:5:2 .

[0080]The preparation method of the lithium-ion battery non-aqueous electrolyte is as follows: the electrolyte is prepared in a glove box, the nitrogen content in the glove box is 99.999%, the actual oxygen content in the glove box is 0.1ppm, and the moisture content is 0.1ppm. Based on...

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Abstract

The invention provides a non-aqueous electrolyte of a lithium ion battery and application of non-aqueous electrolyte. The non-aqueous electrolyte of the lithium ion battery comprises an electrolyte, a non-aqueous solvent and an additive, wherein the additive comprises a first compound and a cyclic ester additive. The first compound contains a plurality of electron-rich alkenyl substituent groups, and the network dimension of a polymer formed by the first compound and additive plays an important role in conduction of lithium ions. Due to the existence of the multi-olefin structure, the network structure formed by the polymer has different sizes, so that the transmission of the lithium ions can be influenced. By utilizing the synergistic effect of the first compound and the cyclic ester additive, the reaction between the electrolyte and a positive electrode can be inhibited in a high-temperature state, so that the high-temperature storage performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a non-aqueous electrolyte for a lithium ion battery and an application thereof. Background technique [0002] Compared with traditional lead-acid batteries, lithium-ion batteries, as rechargeable batteries, have the advantages of high energy density, low self-discharge, and long cycle life, and are widely used in electric vehicles, smart grids, and miniaturized electronic devices. At present, the use safety of lithium-ion batteries is still an important factor restricting the development of its application. [0003] The electrolyte of lithium-ion batteries mostly uses organic solvent systems. When the charging current is large, the temperature of the battery system rises, which leads to safety hazards such as expansion of the battery system and gas production. In addition, in order to further increase the energy density of lithium-ion batteries, researchers often use ternary...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 王子沅王仁和余乐
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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