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 inhomogenei

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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Example Embodiment

[0065] Example 1

[0066] The present embodiment provides a non-aqueous electrolyte lithium ion battery based on the total mass of the nonaqueous electrolytic solution as 100%, the non-aqueous electrolyte comprising a lithium ion mass percentage of 2.5% were fourth compound, 2.5% vinylene carbonate, 2.5% of the additive 1,3-propane sultone 5% sulfuric acid and vinyl acetate, a concentration of the lithium salt comprises a 1mol / L lithium hexafluorophosphate and a mass percentage of 2.5% two lithium hexafluorophosphate, 2.5% bis-fluoro imide and lithium bis (oxalato) 5% lithium difluorophosphate, balance non-aqueous solvent, a non-aqueous solvent of ethylene carbonate, ethyl carbonate, ethyl methyl carbonate, di a mass ratio of 3: 5: 2.

[0067] The non-aqueous electrolyte lithium ion battery was prepared as follows: an electrolyte prepared in a glove box in a glove box in the nitrogen content of 99.999%, the actual oxygen content of 0.1 ppm or glove box, a moisture content of 0.1...

Example Embodiment

[0074] Example 2

[0075] The present embodiment provides a non-aqueous electrolyte lithium ion battery based on the total mass of the nonaqueous electrolytic solution as 100%, the non-aqueous electrolyte comprising a lithium ion mass percentage of 0.02% were fourth compound, 0.025% of vinylene carbonate and 0.025% of 1,3-propane sultone additive, comprising the lithium salt concentration 0.5mol / L of lithium hexafluorophosphate and a mass percentage of 5% were lithium difluorophosphate, 5 % bis-fluoro imide and lithium bis (oxalato) of 10% lithium difluorophosphate, balance non-aqueous solvent, a non-aqueous solvent consisting of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate in a mass ratio 3: 5: 2.

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

Example Embodiment

[0078] Example 3

[0079] The present embodiment provides a non-aqueous electrolyte lithium ion battery based on the total mass of the nonaqueous electrolytic solution as 100%, the non-aqueous electrolyte comprising a lithium ion mass percentage of 5% were fourth compound, 5% vinylene carbonate additive 10% 1,3-propane sultone 5% sulfuric acid and vinyl acetate, a concentration of the lithium salt include 2mol / L of lithium hexafluorophosphate and a mass percentage of about 0.025% respectively two lithium hexafluorophosphate and 0.025% bis fluorosulfonyl imide, and the balance a non-aqueous solvent, a non-aqueous solvent consisting of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate in a mass ratio 3: 5: 2 composition .

[0080]The nonaqueous electrolyte preparation method of the lithium ion battery is prepared as follows: the electrolyte is formulated in the glove box, and the nitrogen content in the glove box is 99.99%, and the actual oxygen content in the glove...

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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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