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Lithium ion battery electrolytic solution and lithium ion battery

A technology of lithium ion battery and electrolyte, applied in the field of lithium ion battery, can solve the problems of difficult application of battery system and inability to stabilize the negative electrode surface.

Active Publication Date: 2020-10-27
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 electrolytic solution and lithium ion battery
  • Lithium ion battery electrolytic solution and lithium ion battery
  • Lithium ion battery electrolytic solution and lithium ion battery

Examples

Experimental program
Comparison scheme
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 electrolytic solution and a lithium ion battery, wherein the electrolytic solution contains a lithium salt, a solvent and a first additive, theconcentration of the lithium salt is 0.1-1.5 mol / L, and the content of the first additive is 0.1-10 parts by weight based on 100 parts by weight of the solvent. The lithium ion battery electrolytic solution disclosed by the invention contains the special first additive, wherein the first additive can be used for high-voltage positive and negative electrode film forming protection, and the stability of the electrolytic solution under high voltage is improved.

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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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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