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Lithium ion battery electrolyte suitable for high-nickel material system and preparation method of lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as not being able to meet comprehensive performance indicators, and achieve the effects of improving stability, ensuring stability and low impedance characteristics, and improving ion conductivity

Inactive Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of many additives cannot meet the comprehensive performance indicators, such as electrical conductivity, film-forming strength, and stability, so further optimization and development of electrolyte formulations and additives has become an urgent need to improve the cycle performance of lithium-ion batteries

Method used

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  • Lithium ion battery electrolyte suitable for high-nickel material system and preparation method of lithium ion battery electrolyte
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  • Lithium ion battery electrolyte suitable for high-nickel material system and preparation method of lithium ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for a lithium-ion battery electrolyte suitable for a high-nickel material system. First, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate are weighed at a mass ratio of 30:30:40 and then mixed uniformly to obtain an organic solvent , and then fully dissolve lithium hexafluorophosphate in an organic solvent, add vinylene carbonate accounting for 2% of the mass fraction of the overall electrolyte, and then add benzotriazole propylsulfonic acid hexafluorophosphate accounting for 1.1% of the mass fraction of the overall electrolyte Lithium is mixed to obtain an electrolyte solution 1; wherein the mass of lithium hexafluorophosphate accounts for 14% of the mass of the whole electrolyte solution 1. The above steps were all performed in a glove box filled with inert gas.

[0025] Preparation of Li-ion battery using electrolyte 1:

[0026] (1) Preparation of positive electrode sheet

[0027] Mix the positive electrode active material high-...

Embodiment 2

[0033] A preparation method for a lithium-ion battery electrolyte suitable for a high-nickel material system. First, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate are weighed at a mass ratio of 30:30:40 and then mixed uniformly to obtain an organic solvent , and then fully dissolve lithium hexafluorophosphate in an organic solvent, add vinylene carbonate accounting for 2% of the mass fraction of the overall electrolyte, and then add benzotriazole propylsulfonic acid hexafluorophosphate accounting for 1.3% of the mass fraction of the overall electrolyte Lithium is mixed to obtain an electrolyte solution 2; wherein the mass of lithium hexafluorophosphate accounts for 14% of the mass of the whole electrolyte solution 2. The above steps were all performed in a glove box filled with inert gas.

[0034] Electrolyte 2 was used to prepare an experimental lithium battery, and the preparation method was the same as in Example 1.

Embodiment 3

[0036] A preparation method for a lithium-ion battery electrolyte suitable for a high-nickel material system. First, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate are weighed at a mass ratio of 30:30:40 and then mixed uniformly to obtain an organic solvent , and then fully dissolve lithium hexafluorophosphate in an organic solvent, add vinylene carbonate accounting for 2% of the mass fraction of the overall electrolyte, and then add benzotriazole propylsulfonic acid hexafluorophosphate accounting for 1.5% of the mass fraction of the overall electrolyte Lithium is mixed to obtain an electrolyte solution 3 ; wherein the mass of lithium hexafluorophosphate accounts for 14% of the mass of the entire electrolyte solution 3 . The above steps were all performed in a glove box filled with inert gas.

[0037] Electrolyte 3 was used to prepare an experimental lithium battery, and the preparation method was the same as in Example 1.

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Abstract

The invention discloses a lithium ion battery electrolyte suitable for a high-nickel material system and a preparation method of the lithium ion battery electrolyte, the lithium ion battery electrolyte comprises an organic solvent, a lithium salt electrolyte, an additive and a film forming additive, and the film forming additive is a lithium hexafluorophosphate benzotriazole alkyl sulfonate compound. The film forming additive provided by the invention can improve the overall ionic conductivity of the electrolyte, and can provide electrons to be combined with free phosphorus pentafluoride in the electrolyte to form a stable compound, so that the damage of lithium salt decomposition to positive and negative SEI films is reduced, and the cycle performance of the lithium ion battery at normaltemperature and high temperature is effectively improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery electrolyte suitable for a high nickel material system and a preparation method thereof. Background technique [0002] As the world's energy demand continues to grow, the consumption of fossil energy on the earth continues to accelerate, which has brought about a series of increasingly prominent environmental problems. Efficient, safe, clean and renewable new energy and related technologies have become a research hotspot around the world. Lithium-ion batteries have a series of advantages such as high voltage, high energy and power density, cycle life, small self-discharge, and environmental friendliness. They have become the most efficient energy storage devices and are widely used in mobile electronic devices. Get broader development on electric vehicles and hybrid vehicles. With the advancement of science and technology and the continuous development...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0569H01M10/0525H01M2300/0025H01M2300/0037H01M2300/004Y02E60/10
Inventor 王鹏
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY