Lithium ion battery electrolyte and preparation method and application thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of lowering thermal decomposition temperature, increasing internal resistance, poor high-temperature performance of lithium-ion batteries, etc., and achieving the effect of suppressing the combustion chain reaction

Pending Publication Date: 2022-02-11
湖南法恩莱特新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as the nickel content increases, the performance of the battery decreases as the Ni of the positive electrode material increases: the redox peak polarization increases, the structural transformation leads to volume shrinkage, capacity decay, and poor cycle performance; as the cycle progresses, the discharge voltage decreases and the Ni content decreases. Increasing the internal resistance also tends to increase; the thermal decomposition temperature decreases and the heat release increases, that is, the thermal stability of the material becomes worse; Ni 4+ High content, Ni 4+ Has a strong reduction tendency, prone to Ni 4+ —Ni 3+ The reaction, thereby oxidizing the electrolyte, makes the thermal stability worse; there is a large proportion of Ni 2+ , causing the material to be oxidative, and then the electrode material can slowly decompose the liquid electrolyte, and the safety problems such as battery flatulence and overcharging are more prominent
Ultimately leading to poor high temperature performance of Li-ion batteries

Method used

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  • Lithium ion battery electrolyte and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0071] This embodiment provides a lithium-ion battery electrolyte and a preparation method thereof.

[0072] The lithium ion battery electrolyte of the present embodiment is made up of the preparation raw material of following mass fraction:

[0073] Lithium salt: lithium trifluoromethanesulfonimide;

[0074] Solvent: the mass ratio of dimethyl carbonate, diethyl carbonate and ethylene carbonate is 1:1:1;

[0075] Additives: dimethyl methyl phosphate, bis(2,2,2-trifluoroethyl) carbonate and diphenyldimethoxysilane;

[0076] The molar concentration of lithium salt in the electrolyte is 1mol / L;

[0077] The mass fraction of dimethyl methyl phosphate in the electrolyte is 1%;

[0078] The mass fraction of bis(2,2,2-trifluoroethyl) carbonate in the electrolyte is 2%;

[0079] The mass fraction of diphenyldimethoxysilane in the electrolyte is 0.2%;

[0080] Solvent balance.

[0081] This embodiment also provides a preparation method for the electrolyte, comprising the followi...

Embodiment 2

[0093] This embodiment is a lithium-ion battery electrolyte and a preparation method thereof.

[0094] The lithium ion battery electrolyte of the present embodiment is made up of the preparation raw material of following mass fraction:

[0095] Lithium salt: lithium trifluoromethanesulfonimide;

[0096] Solvent: the mass ratio of dimethyl carbonate, diethyl carbonate and ethylene carbonate is 1:1:1;

[0097] Additives: dimethyl methyl phosphate, bis(2,2,2-trifluoroethyl) carbonate and diphenyldimethoxysilane;

[0098] The molar concentration of lithium salt in the electrolyte is 1mol / L;

[0099] The mass fraction of dimethyl methyl phosphate in the electrolyte is 2%;

[0100] The mass fraction of bis(2,2,2-trifluoroethyl) carbonate in the electrolyte is 1.8%;

[0101] The mass fraction of diphenyldimethoxysilane in the electrolyte is 0.4%;

[0102] Solvent balance.

[0103] The preparation method of this embodiment is the same as in Example 1.

Embodiment 3

[0105] This embodiment is a lithium-ion battery electrolyte and a preparation method thereof.

[0106] The lithium ion battery electrolyte of the present embodiment is made up of the preparation raw material of following mass fraction:

[0107] Lithium salt: lithium trifluoromethanesulfonimide;

[0108] Solvent: the mass ratio of dimethyl carbonate, diethyl carbonate and ethylene carbonate is 1:1:1;

[0109] Additives: dimethyl methyl phosphate, bis(2,2,2-trifluoroethyl) carbonate and diphenyldimethoxysilane;

[0110] The molar concentration of lithium salt in the electrolyte is 1mol / L;

[0111] The mass fraction of dimethyl methyl phosphate in the electrolyte is 3%;

[0112] The mass fraction of bis(2,2,2-trifluoroethyl) carbonate in the electrolyte is 1.5%;

[0113] The mass fraction of diphenyldimethoxysilane in the electrolyte is 0.4%;

[0114] Solvent balance.

[0115] The preparation method of this embodiment is the same as in Example 1.

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Abstract

The invention discloses a lithium ion battery electrolyte as well as a preparation method and application thereof. The lithium ion battery electrolyte comprises the following preparation raw materials: an organic solvent, a lithium salt and an additive, and the additive is prepared from dimethyl methylphosphate, di (2, 2, 2-trifluoroethyl) carbonate and diphenyldimethoxysilane. According to the lithium ion battery electrolyte disclosed by the invention, dimethyl methylphosphate, di (2, 2, 2-trifluoroethyl) carbonate and diphenyldimethoxysilane are used as electrolyte additives, and the additives act together, so that the lithium ion battery electrolyte forms a film on the surface of a cathode, the thermal stability of an SEI film is improved, and the SEI film is not easy to decompose under a high-temperature condition; and meanwhile, the cycle performance of the lithium ion battery at high temperature is also improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte and a preparation method and application thereof. Background technique [0002] At present, lithium-ion batteries are widely used in digital products, electric vehicles and other fields, and people have put forward higher requirements for the energy density of lithium-ion batteries. High-nickel ternary lithium-ion batteries are an important direction for the development of lithium-ion batteries today. The selection of high-nickel ternary cathode materials to increase the energy density of the power battery and extend the cruising range is a commonly used method at present. [0003] However, as the nickel content increases, the performance of the battery decreases as the Ni of the positive electrode material increases: the redox peak polarization increases, the structural transformation leads to volume shrinkage, capacity decay, and...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 邵俊华李海杰孔东波张利娟龚国斌王郝为郭飞闫国锋宋东亮王亚洲侯红歧韩飞
Owner 湖南法恩莱特新能源科技有限公司
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