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Lithium-ion battery electrolyte and lithium-ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems that the battery system is difficult to apply, the surface of the negative electrode cannot play a stable role, etc., so as to improve stability, improve high-potential cycle performance, and improve high-temperature performance. Effect

Active Publication Date: 2022-03-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing positive electrode film-forming additives are formed by ring-opening polymerization, or preferentially lose electrons to form a film, but the oxidation potential of the former is similar to the decomposition potential of the polymer, and the latter cannot stabilize the surface of the negative electrode when forming a film on the positive electrode. Therefore, it is difficult to apply in the battery system higher than 4.5V

Method used

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  • Lithium-ion battery electrolyte and lithium-ion battery
  • Lithium-ion battery electrolyte and lithium-ion battery
  • Lithium-ion battery electrolyte and lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The electrolyte solution is prepared in a glove box, the moisture in the glove box is controlled at ≤5ppm, and the temperature is room temperature. 30 parts by weight of ethylene carbonate and 70 parts by weight of ethyl methyl carbonate are mixed to obtain a mixed solvent, and lithium hexafluorophosphate (LiPF 6 ), stirred evenly to make a solution with a concentration of 1mol / L. 0.5 parts by weight of Compound 1 as the first additive and 5 parts by weight of fluoroethylene carbonate (FEC) as the second additive were added to the solution to prepare the lithium-ion battery electrolyte E1 of this embodiment.

[0063] The structural formula of compound 1 is:

Embodiment 2～6

[0065] Lithium-ion battery electrolytes E2-E6 were prepared according to the method of Example 1, with the difference that Compound 2-Compound 6 were used to replace Compound 1 in Example 1. The structural formulas of compound 2~compound 6 are respectively:

Embodiment 2

[0066] Embodiment 2 adopts compound 2:

[0067]

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Abstract

The present disclosure relates to a lithium-ion battery electrolyte and a lithium-ion battery. The electrolyte contains a lithium salt, a solvent and a first additive. The concentration of the lithium salt is 0.1-1.5 mol / L. As a basis, the content of the first additive is 0.1-10 parts by weight. The lithium-ion battery electrolyte of the present disclosure contains a special first additive, which can be used for high-voltage positive and negative film-forming protection, and improves the stability of the electrolyte under high voltage.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion batteries, and in particular, to an electrolyte solution of a lithium-ion battery and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in electronic devices due to their high operating voltage, high energy density, long cycle life, and environmental friendliness. In recent years, people have developed a series of materials with excellent electrochemical properties, so that lithium-ion batteries have high energy and power density, and then applied to pure electric vehicles and hybrid vehicles. One strategy to increase the energy density of lithium-ion batteries is to increase the operating voltage of lithium-ion batteries. At present, a variety of high-potential cathode materials have been developed, such as nickel-rich ternary layered metal oxides, lithium-rich layered metal oxides, high-voltage Spinel metal oxides, high-pressure polyanionic metal oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 王丽娜王圣
Owner BYD CO LTD
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