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A kind of anti-overcharge lithium battery electrolyte and preparation method thereof

An electrolyte and lithium battery technology, applied in electrolytes, secondary batteries, and secondary battery repair/maintenance, etc., can solve problems such as safety accidents, cell bursting, and high gas production, and achieve strong applicability and increased safety. , the effect of improving safety performance

Active Publication Date: 2019-07-02
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, U.S. Patent US5776627 discloses an anti-overcharge additive biphenyl. When the battery is overcharged, the gas-producing additive biphenyl will polymerize on the surface of the electrode to form an SEI film, which prevents the migration of lithium ions, increases the internal resistance of the battery, and makes it break. Electricity improves the safety performance of the battery, but this kind of additive produces a lot of gas, which is easy to cause the battery cell to burst and cause a safety accident

Method used

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  • A kind of anti-overcharge lithium battery electrolyte and preparation method thereof
  • A kind of anti-overcharge lithium battery electrolyte and preparation method thereof
  • A kind of anti-overcharge lithium battery electrolyte and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] Add dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and ethylene carbonate (EC) in sequence according to the mass ratio of 1:1:1, and when the temperature drops to 10°C, ensure that the temperature is not higher than 10°C Slowly add lithium salt under low pressure to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1mol / L, a lithium difluorooxalate borate concentration of 0.2mol / L, and a lithium bisfluorosulfonyl imide concentration of 0.1mol / L, and keep stirring until the solution is clear, and then fully Stir and transfer to a bottle filled with inert gas for storage.

Embodiment 2

[0031] Add dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and ethylene carbonate (EC) in sequence according to the mass ratio of 1:1:1, and when the temperature drops to 10°C, ensure that the temperature is not higher than 10°C Slowly add lithium salt under low pressure to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1mol / L, a lithium difluorooxalate borate concentration of 0.2mol / L, and a lithium bisfluorosulfonyl imide concentration of 0.1mol / L, and keep stirring until the solution is clear; then follow The total mass of the electrolyte is calculated by adding 1% vinylene carbonate and 2% 1,3-propane sultone, then fully stirred, and transferred to a packaging bottle filled with inert gas for storage until use.

Embodiment 3

[0033] Add dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and ethylene carbonate (EC) in sequence according to the mass ratio of 1:1:1, and when the temperature drops to 10°C, ensure that the temperature is not higher than 10°C Slowly add lithium salt under low pressure to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1mol / L, a lithium difluorooxalate borate concentration of 0.2mol / L, and a lithium bisfluorosulfonyl imide concentration of 0.1mol / L, and keep stirring until the solution is clear; then follow The total mass of the electrolyte is calculated by adding 2% 1,3-propane sultone, then fully stirred, and transferred to a packaging bottle filled with inert gas for storage until use.

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Abstract

The invention discloses an anti-overcharging lithium battery electrolyte and a preparation method therefor, and belongs to the technical field of a lithium battery material. The anti-overcharging lithium battery electrolyte is prepared from lithium salt, compound solvents and additives; the anti-overcharging lithium battery electrolyte is characterized in that the lithium salt comprises at least one kind of inorganic lithium salt, organic lithium borate or sulfimide type lithium salt; the compound solvents are at least two kinds of solvents in carbonic ester solvents; the additives are at least one kind of sulfite type compound, a carbonic ester compound and a sulfonate type compound and 2', 4'-dimethlyl-2, 4-diflurodiphenyl; and the additives account for 1-15% of the electrolyte based on mass. The prepared anti-overcharging lithium battery electrolyte can be subjected to oxygenolysis prior to the electrolyte in lithium battery overcharging, so that contact between the electrolyte and the electrode surface can be blocked, and safety performance can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to an electrolyte solution for preventing overcharge lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is the rechargeable battery with the highest specific energy at present. It replaces metallic lithium as the anode with a lithium-intercalated compound, thereby overcoming the passivation and lithium dendrite problems of the anode in traditional lithium batteries, and the lithium-ion battery has a working voltage High, high energy density, high power density and other advantages have been widely used in digital, mobile communications and other fields, and gradually applied in national defense and military. In recent years, with the rapid development of electric bicycles and electric vehicles, lithium-ion batteries It is considered to be the vehicle power battery with the most potential development at present. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235H01M2300/0037Y02E60/10
Inventor 刘永李立飞王吉峰赵志华任加兴
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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