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Electrolyte, preparation method thereof, high-energy-density lithium ion battery containing electrolyte and preparation method thereof

A lithium-ion battery, high energy density technology, applied in the field of lithium-ion batteries, can solve the problems of lithium battery capacity attenuation, etc., to achieve the effect of alleviating capacity attenuation, enhancing interaction, increasing solubility and electrolyte ionic conductivity

Inactive Publication Date: 2020-10-13
GUANG DONG GREENWAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The second object of the present invention is to provide a high-energy-density lithium-ion battery and a preparation method thereof, which can alleviate the lithium battery capacity attenuation and particle pulverization caused by the volume expansion of the silicon-based negative electrode during recycling. And other issues

Method used

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  • Electrolyte, preparation method thereof, high-energy-density lithium ion battery containing electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of electrolyte: in a glove box filled with argon (moisture ≤ 5ppm, oxygen ≤ 1ppm), mix ethylene carbonate and diethyl carbonate at a ratio of 2:3 to make a non-aqueous organic solvent, and take 80 %, add 6% fluoroethylene carbonate and 2% potassium carbonate by mass fraction, fully stir, slowly add 12% lithium hexafluorophosphate into the mixed solution, stir until completely dissolved, and obtain an electrolyte.

[0043] Prepare the positive electrode sheet: mix the positive electrode active material nickel cobalt lithium manganate NCM811, the conductive agent conductive carbon black, and the binder polyvinylidene fluoride with NMP solvent at a mass ratio of 98:1:1 to make a positive electrode slurry; then the positive electrode material The slurry is coated on the surface of the aluminum foil, dried, rolled and then cut to obtain the positive electrode sheet of the required size;

[0044] Prepare negative electrode sheet: mix silicon carbon material, singl...

Embodiment 2

[0048] Preparation of electrolyte: in a glove box filled with argon (moisture ≤ 5ppm, oxygen ≤ 1ppm), take 85% propylene carbonate, add 1,2-difluoroethylene carbonate with a mass fraction of 2%, 2% sodium carbonate, fully stirred, and slowly added 11% lithium bisfluorosulfonyl imide into the mixed solution, and stirred until completely dissolved to obtain an electrolyte solution.

[0049] Prepare the positive electrode sheet: mix lithium cobaltate, graphene and perfluorosulfonic acid resin with NMP solvent at a mass ratio of 85:7:8 to make a positive electrode slurry; then coat the positive electrode material slurry on the surface of the aluminum foil and dry it. Cut the sheet after rolling to obtain the positive electrode sheet of the required size;

[0050] Prepare the negative electrode sheet: mix artificial graphite, conductive carbon black, carbon fiber, perfluorosulfonic acid resin, polymethyl acrylate with water at a mass ratio of 88:5.2:2:3.5:1.3 to make negative elect...

Embodiment 3

[0054] Preparation of electrolyte: In a glove box filled with argon (moisture ≤ 5ppm, oxygen ≤ 1ppm), mix dimethyl carbonate and ethyl acetate with a mass of 1:1 to make a non-aqueous organic solvent, and take 86 %, add 2% chloroethylene carbonate and 2% lithium carbonate in a mass fraction, fully stir, slowly add 10% lithium bisfluorosulfonyl imide into the mixed solution, stir until completely dissolved, and obtain an electrolyte.

[0055] Preparation of positive electrode sheet: mix lithium iron phosphate, conductive graphite and polymethyl acrylate with NMP solvent at a mass ratio of 92:3:5 to make positive electrode slurry; then coat the positive electrode material slurry on the surface of aluminum foil, dry, and roll Cut the sheet after pressing to get the positive electrode sheet of the required size;

[0056] Preparation of negative electrode sheet: mix hard carbon, conductive carbon black, carbon fiber, polyvinylidene fluoride with water at a mass ratio of 82:7:3:8 to...

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Abstract

The invention discloses an electrolyte, a preparation method thereof, a high-energy-density lithium ion battery containing the electrolyte and a preparation method thereof. The electrolyte comprises alithium salt, a non-aqueous organic solvent, a negative electrode film-forming organic additive and a modified additive. The negative electrode film-forming organic additive is any one or at least two of fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, chloroethylene carbonate and vinylene carbonate, and the modified additive is any one or at least two of potassium carbonate, sodium carbonate and lithium carbonate. The electrolyte provided by the invention can quickly form a layer of compact, stable and thin SEI film with good mechanical properties on the surfaces of negative electrode material particles. The high-energy-density lithium ion battery containing the electrolyte can relieve the problems of lithium battery capacity attenuation, particle pulverization and the like caused by volume expansion of a silicon-based negative electrode in the recycling process, and has good cycling stability and rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a preparation method thereof, and a high energy density lithium ion battery containing the electrolyte and a preparation method thereof. Background technique [0002] As one of the most important electrochemical energy storage devices at present, lithium-ion batteries have been used in consumer electronics and power tools from small-capacity batteries, and have gradually expanded to new energy electric vehicles, electric ships, electric two-wheeled vehicles and Emerging fields such as robotics, these fields not only require lithium-ion batteries to have greater capacity, but also continuously put forward higher requirements for their energy density. [0003] Silicon-based materials have a very high theoretical gram capacity, and are currently the negative electrode materials commonly used by cell manufacturers to prepare high-energy-density cells....

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0583H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0583H01M2300/0091Y02E60/10Y02P70/50
Inventor 徐宁郭华军李小兵周丹张志平刘聪王永湘
Owner GUANG DONG GREENWAY TECH CO LTD
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