Lithium ion battery, anode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrolyte penetration and poor battery cycle performance improvement, etc.

Inactive Publication Date: 2019-05-24
江西星盈科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the research of the present invention, the inventors found that the graphene used in this patent technology has relatively few lithium intercalation sites, the infiltration effect of the electrolyte is poor, and the effect of improving the cycle performance of the battery is not good.

Method used

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  • Lithium ion battery, anode material and preparation method thereof
  • Lithium ion battery, anode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The present embodiment provides a kind of preparation method of lithium-ion battery negative electrode material, and it mainly comprises the following steps:

[0067] 1) Graphene oxide is synthesized by using graphite powder. The synthesis method of this step can be realized by using existing technologies, such as but not limited to using the Hummers method to synthesize graphene oxide in this embodiment by liquid phase oxidation. for example:

[0068] Put a certain amount of concentrated sulfuric acid in an ice-water bath for 4 hours, add a predetermined amount of graphite powder, slowly add potassium permanganate under vigorous stirring, keep the system temperature not exceeding 20°C, and put it into a 30-35°C container after stirring evenly. React in a water bath for 2-5 hours, then add deionized water so that the system temperature does not exceed 85-98°C, continue stirring for 15 minutes; add 1400mL deionized water and 150mL 30% (mass fraction) H 2 o 2 , filter i...

Embodiment 2

[0083] As an illustration of this embodiment, the inventor further found in the process of carrying out the present invention that the following steps can be further included after step 3) of embodiment 1 and before step 4):

[0084] 31) Soak the three-dimensional wrinkled graphene oxide powder PGO1 obtained in step 3) in an alkaline solution (that is, a weakly alkaline solution with certain corrosiveness, such as but not limited to: sodium oxide solution, potassium oxide solution, wherein the The concentration of the alkaline solution can be but not limited to 1~5mol / L), soak for a predetermined time, the soaking time is about 12-16h, such as soaking for 14h, so that the alkaline solution reacts with the oxygen-containing groups of graphene oxide (ie Weak corrosion reaction), in order to speed up its reaction speed, it can be stirred during soaking to make it uniformly dispersed, and the suspension formed by this graphene oxide powder PGO1 soaking solution is recorded as the t...

experiment example 1

[0093] Put 500mL of concentrated sulfuric acid in an ice-water bath for 4 hours, add 15g of graphite powder, slowly add 45g of potassium permanganate under vigorous stirring, keep the system temperature not exceeding 20°C, stir well and put it in a water bath of 30-35°C After reacting for 2-5 hours, add 700 mL of deionized water so that the temperature of the system does not exceed 85-98 ° C, and continue to stir for 15 minutes; respectively add 1400 mL of deionized water and 150 mL of 30% (mass fraction) H2O2, filter immediately, and fully wash with 1mol / L HCl From the filter cake to the filtrate, SO24- cannot be detected, and then washed with deionized water to become neutral. After freeze-drying, the obtained sample was denoted as graphene oxide PGO1.

[0094] A 0.25 g / L graphene oxide dispersion solution was prepared, and a spray drying experiment was carried out on a spray dryer. The obtained sample was designated as PGO1, and the obtained PGO1:C was mixed and dispersed a...

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Abstract

The invention relates to the field of lithium ion batteries and discloses a lithium ion battery, an anode material and a preparation method thereof. The method comprises preparing graphene oxide, anddispersing the graphene oxide in a first solvent to form a first suspension; separating graphene oxide powder from the first suspension, wherein the surface of the graphene oxide powder has three-dimensional wrinkles; mixing and dispersing the graphene oxide powder and graphite powder in a second solvent to form a second suspension; spray-drying the second suspension to obtain a dried solid powder; baking the solid powder under an inert atmosphere, and then cooling the solid powder so as to obtain the lithium ion battery anode material.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery, negative electrode materials and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, because of their advantages such as high energy density, high battery voltage, long cycle life and no memory effect, they have not only rapidly become energy storage devices used in various fields of life, but also attracted experts and researchers. broad interests. With the development of electrical and electronic equipment, especially the rapid development of electric vehicles, the energy density and power density of existing lithium-ion batteries cannot meet the energy demand. Therefore, finding and preparing materials with high energy density is an urgent problem. [0003] With the improvement of battery energy density, due to its own structural characteristics, the theoretical specific capacity of graphite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCY02E60/10
Inventor 郭永兴梁福永刘仁月张伟康郭永明卢和嘉
Owner 江西星盈科技有限公司
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