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Solvent for electrolyte and application of solvent in high-voltage electrolyte of lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the application field of solvent for electrolyte and high-voltage electrolyte of lithium-ion battery, to achieve the effect of inhibiting decomposition, good wettability and low viscosity, and improving high-temperature storage performance

Pending Publication Date: 2022-03-22
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the technical problem that the existing method for improving the energy density of the battery cannot improve the conductivity of lithium ions, increase the energy density of the battery, and improve the high-voltage resistance stability of the lithium-ion battery, while having better wettability and low viscosity. A solvent for electrolyte and its application in high-voltage electrolyte of lithium-ion batteries is proposed. The solvent can improve the high-voltage stability of lithium-ion batteries and has the function of protecting the negative electrode, and it has good wettability and low viscosity. It can improve the conductivity of lithium ions, improve the energy density of the battery, and improve the safety of the battery

Method used

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  • Solvent for electrolyte and application of solvent in high-voltage electrolyte of lithium ion battery
  • Solvent for electrolyte and application of solvent in high-voltage electrolyte of lithium ion battery
  • Solvent for electrolyte and application of solvent in high-voltage electrolyte of lithium ion battery

Examples

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Embodiment 1

[0053] This embodiment provides a solvent for electrolyte, its structural formula is as follows:

[0054]

[0055] The preparation method of the solvent for the electrolyte provided in this example is: put sodium methanesulfinate into a round bottom flask filled with solvent and stir evenly, then slowly add ethyl bromoacetate (CAS: 105-36-2 ), stirring at 30°C-60°C for 12h-16h, the stirring speed is 200-800r / min, after washing and extraction, column chromatography and other treatments, the solvent for electrolyte shown in P1 is obtained, and the synthesis reaction is as follows:

[0056]

Embodiment 2

[0058] This embodiment provides a solvent for electrolyte, its structural formula is as follows:

[0059]

[0060] The preparation method of the solvent for electrolyte provided in this example is: put sodium benzene sulfinate into a round bottom flask filled with solvent and stir evenly, then slowly add ethyl chloroacetate (CAS: 105-39-5 )

[0061] Stir at 30°C-70°C for 12h-16h, the stirring speed is 200-900r / min, and after washing and extraction, column chromatography and other treatments, the solvent for electrolyte shown in P15 is obtained. The synthesis reaction is as follows:

[0062]

Embodiment 3

[0064] This embodiment provides a method for preparing a lithium-ion battery, wherein the positive electrode active material is a high-voltage lithium cobaltate material from Tianjin Bamo Technology, and the negative electrode is an artificial graphite material from Jiangxi Zichen. The specific steps are as follows:

[0065] (1) Positive electrode preparation steps: Weigh 3% polyvinylidene fluoride (PVDF), 2% conductive agent superP and 95% lithium cobaltate (LiCoO 2 ), sequentially added to N-methylpyrrolidone (NMP), fully stirred and mixed evenly, the slurry was coated on the aluminum foil current collector, dried, cold pressed, and punched to obtain the positive electrode sheet;

[0066] (2) Negative electrode preparation steps: Weigh 2% sodium carboxymethylcellulose (CMC), 3% styrene-butadiene rubber (SBR) and 94% graphite in mass percentage, add them to deionized water in turn, stir and mix well , coating the slurry on the copper foil current collector, drying, cold press...

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Abstract

The invention provides a solvent for an electrolyte and application of the solvent in a high-voltage electrolyte of a lithium ion battery, and belongs to the field of lithium ion batteries. The solvent for the electrolyte is sulfonated carboxylic ester, the solvent can be applied to the high-voltage electrolyte of the lithium ion battery, and the electrolyte comprises a basic solvent, a lithium salt and the solvent for the electrolyte. The solvent for the electrolyte can improve the high-voltage-resistant stability of a lithium ion battery, has a negative electrode protection function, has good wettability and low viscosity, and can well improve the conductivity of lithium ions, improve the energy density of the battery and improve the safety of the battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a solvent for electrolyte and its application in high-voltage electrolyte of lithium-ion batteries. Background technique [0002] The battery life of new energy vehicles depends on the energy density of the battery. As consumers continue to increase their requirements for vehicle mileage, high energy density has become the future development direction of power batteries. At present, the way to improve the energy density of lithium secondary batteries mainly includes the development of high specific capacity positive and negative electrode materials and high voltage positive electrode materials. [0003] In recent years, high voltage cathode materials such as LiNi 0.5 mn 1.5 o 4 (4.7V vs. Li + / Li), LiCoPO 4 (4.8Vvs.Li + / Li), LiCoPO 4 F (4.9V vs. Li + / Li) and LiNiPO 4 (5.1V vs. Li + The development of materials such as / Li) is relatively hot, but at present, the or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/058H01M10/0525H01M10/42
CPCH01M10/0569H01M10/058H01M10/0525H01M10/4235Y02P70/50
Inventor 周景艳苗力孝鞠署元苏凯民
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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