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High-voltage lithium ion electrolyte and application thereof

A lithium-ion and electrolyte technology, applied in the field of high-voltage lithium-ion electrolyte, can solve the problems of high-temperature and high-pressure cycle performance of the electrolyte, safety performance needs to be improved, poor high-temperature storage performance, and poor compatibility of the electrolyte, etc., to improve cycle performance. Stable, high compatibility, not easy to decompose effect

Active Publication Date: 2021-07-20
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent document CN104752766B discloses an electrolyte additive, which contains three silicon groups in the structural formula, has a large molecular weight, poor compatibility with the electrolyte, and poor high-temperature storage performance
Although the commonly used sulfide additive trifluoromethylphenyl sulfide (PTS) improves the cycle stability of the battery under high voltage to a certain extent, the high temperature and high pressure cycle performance and safety performance of the electrolyte still need to be improved.

Method used

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  • High-voltage lithium ion electrolyte and application thereof
  • High-voltage lithium ion electrolyte and application thereof
  • High-voltage lithium ion electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In an airtight protective atmosphere, the water content is 0.1ppm, the oxygen content is 0.1ppm, and the mass ratio of the solvents ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) is 1:2:1 Add and mix sequentially, use a condenser to cool down the mixed solution to ensure that the temperature is not higher than 10°C, slowly add lithium hexafluorophosphate to ensure that the lithium salt concentration is 1.3mol / L, and then add additives with a mass fraction of 2.0wt% vinylene carbonate (VC ) and 1.0wt% fluoroethylene carbonate (FEC), and finally adding mass fraction is 0.5wt% 1-[2-(trimethylsilyl)ethoxycarbonyloxy]pyrrolidine-2,5-dione additive and 2.0 wt% Allylphenyl Sulfide Stirring was continued until the solution became clear.

Embodiment 2

[0032] Under a nitrogen-enclosed protective atmosphere, the water content is 0.1ppm, and the oxygen content is 0.1ppm. The mass ratio of the solvents ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) is 1:2:1 Add and mix sequentially, use a condenser to cool down the mixed solution to ensure that the temperature is not higher than 10°C, slowly add lithium hexafluorophosphate to ensure that the lithium salt concentration is 1.3mol / L, and then add film-forming additives with a mass fraction of 2.0wt% vinylene carbonate (VC) and 1.0wt% fluoroethylene carbonate (FEC), the final mass fraction of 1.0wt% 1-[2-(trimethylsilyl)ethoxycarbonyloxy]pyrrolidine-2,5-dione The additive and 2.0 wt% allyl phenyl sulfide continued to stir until the solution became clear.

Embodiment 3

[0034] Under a nitrogen-enclosed protective atmosphere, the water content is 0.1ppm, and the oxygen content is 0.1ppm. The mass ratio of the solvents ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) is 1:2:1 Add and mix sequentially, use a condenser to cool down the mixed solution to ensure that the temperature is not higher than 10°C, slowly add lithium hexafluorophosphate to ensure that the lithium salt concentration is 1.3mol / L, and then add film-forming additives with a mass fraction of 2.0wt% vinylene carbonate (VC) and 1.0wt% fluoroethylene carbonate (FEC), the final mass fraction of 2.0wt% 1-[2-(trimethylsilyl)ethoxycarbonyloxy]pyrrolidine-2,5-dione The additive and 2.0 wt% allyl phenyl sulfide continued to stir until the solution became clear.

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Abstract

The invention provides a high-voltage lithium ion electrolyte and application thereof, and the electrolyte comprises the following components in percentage by weight: 5-20wt% of electrolyte lithium salt, 70-80wt% of solvent, 0.1-10wt% of thioether additive, 0.1-5wt% of silicon additive and 0.1-5wt% of other film-forming additive, the sulfur ether additive comprises any one or a mixture of several of the following components, the silicon additive comprises any one or a mixture of several of the following components, and the high-temperature and high-pressure cycle performance and the battery capacity of the lithium ion battery are remarkably improved through the technical scheme of the invention.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage lithium-ion electrolyte and its application. Background technique [0002] As a new type of green and environmentally friendly battery, lithium-ion batteries have the characteristics of large specific capacity, good safety and long cycle life, which make them widely used in aerospace, wearable and medical electronic equipment, transportation and national security. Electrolyte is an important part of lithium-ion batteries and a bridge connecting the positive and negative electrodes of batteries. Therefore, the performance of electrolyte can greatly affect the performance of lithium-ion batteries. The development of new electrolytes is of great significance. [0003] The addition of a small amount of additives can significantly improve the conductivity, cycle performance and safety of the battery. New silicon additives have become the focus of domestic ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 赵卫民陈新林红孙建勇刘永王彭丽郭庆元
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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