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Preparation method of negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as electrode preparation methods are not considered, achieve stable cycle performance, clean industrial production, and realize the effect of industrial production

Inactive Publication Date: 2009-12-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, people mainly improve the charge and discharge performance by improving the negative electrode material, without considering the electrode preparation method, and still adopt the traditional method mentioned above to prepare the lithium ion battery negative electrode

Method used

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  • Preparation method of negative electrode material of lithium ion battery
  • Preparation method of negative electrode material of lithium ion battery
  • Preparation method of negative electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 0.5 grams of flake graphite with an average particle size of 30 microns, 0.4 grams of sodium nitrate and 2.5 grams of potassium permanganate were added to 20 grams of concentrated sulfuric acid with a mass fraction of 98%, stirred for 120 hours, filtered and washed, and placed in 20 In an aqueous solution, ultrasonically disperse at a frequency of 40KHz and a power of 200W for 2 hours, add 0.1 gram of hydrazine hydrate, stir at room temperature for 12 hours, perform vacuum filtration under a vacuum of 20.0KPa, and dry naturally to obtain a lithium-ion battery Negative material.

[0024] figure 1 It is a digital photo of the lithium ion battery negative electrode material prepared by Example 1. Depend on figure 1 It can be seen that the area of ​​the graphene film obtained in Example 1 is 1 square centimeter.

[0025] figure 2 It is the scanning electron microscope picture of the negative electrode material of lithium ion battery prepared by example 1. Depend on ...

Embodiment 2

[0029] 1.0 grams of flake graphite with an average particle size of 30 microns, 0.8 grams of sodium nitrate and 5.0 grams of potassium permanganate were added to 40 grams of concentrated sulfuric acid with a mass fraction of 98%, stirred for 120 hours, filtered and washed, and placed in 40 In an aqueous solution, disperse ultrasonically for 2 hours at a frequency of 40KHz and a power of 200W, add 0.2 gram of hydrazine hydrate, stir at room temperature for 12 hours, perform vacuum filtration under a vacuum of 20.0KPa, and dry naturally to obtain a lithium ion battery Negative material. The obtained graphene film has an area of ​​1 square centimeter and a thickness of about 6 microns, and the -1 The reversible specific capacity of the current charge and discharge test is 250mAh·g -1 .

Embodiment 3

[0031] 5.0 grams of flake graphite with an average particle size of 30 microns, 4.0 grams of sodium nitrate and 25 grams of potassium permanganate were added to 200 grams of concentrated sulfuric acid with a mass fraction of 98%, stirred for 100 hours, filtered and washed, and placed in 200 In an aqueous solution, disperse ultrasonically for 2 hours at a frequency of 40KHz and a power of 200W, add 1 gram of hydrazine hydrate, stir at room temperature for 12 hours, perform vacuum filtration under a vacuum of 20.0KPa, and dry naturally to obtain a lithium-ion battery Negative material. The obtained graphene film has an area of ​​4 square centimeters and a thickness of about 6 microns, and the -1 The reversible specific capacity of the current charge and discharge test is 200mAh·g -1 .

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Abstract

The invention discloses a preparation method of negative electrode material of lithium ion battery; oxidation, ultrasonic dispersion, vacuum filtration, natural air drying are carried out on the crystalline flake graphite using sodium nitrate, potassium permanganate and concentrated sulfuric acid to obtain the lithium ion battery negative electrode material, namely, graphene film with an area of 0.1-100 cm and a thickness of 0.1-100 microns. The negative electrode material in the invention has the advantages of high conductivity, large reaction area, large free expansion space in charge and discharge and adaption to different environments with high charge and discharge rates and the like, thus realizing high cycling battery performance, high battery specific capacity and swift charge and discharge capabilities of batteries; the reversible specific capacity can maintain above 300mAh-g when charging and discharging with current of 100mAh-g.The preparation process of the negative electrode material of lithium ion battery is free of agglomerant, conductive agent and metal current collectors, thus simplifying production process greatly, reducing cost and being applicable to industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode material, in particular to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] The internal structure of lithium-ion batteries is usually divided into four parts: positive electrode, negative electrode, separator and electrolyte. The negative electrode is composed of a current collector and an active material layer; the current collector is generally made of copper foil, and the active material layer includes an active material, a conductive agent and a binder. [0003] CN101159324 discloses a traditional method for preparing lithium-ion battery negative poles: active material, conductive agent and binder are prepared into a slurry in a certain ratio, coated on a current collector, and dried to obtain a lithium-ion battery negative pole. [0004] At present, graphitized carbon materials are the main anode materials for commercial l...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/38
CPCY02E60/12Y02E60/10
Inventor 杨晓伟马紫峰何雨石柏大伟
Owner SHANGHAI JIAO TONG UNIV
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