High-capacity graphite material and preparation method as well as application thereof

A graphite material, high-capacity technology, applied in the direction of graphite, electrical components, electrochemical generators, etc., can solve the problems of increasing the specific surface area of ​​the particle surface, complex process, difficult to control, etc., to meet the requirements of large rate charge and discharge, Reduced manufacturing cost and high first-time efficiency

Inactive Publication Date: 2012-09-12
天津市贝特瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has complex processes, is difficult to control, and is prone to residual metal elements, and the number of protrusions on the particle surface increases the specific surface area of ​​the particle surface, thereby increasing its first irreversible capacity and increasing its production cost.
[0006] CN1417876A discloses that a certain amount of metal oxide is compounded on the surface of graphite by a solution method, and the graphite negative electrode material coated with metal oxide is obtained after drying and its preparation method. The preparation process of the method is simple, safe, and low in cost. The prepared Graphite material has high specific capacity, but it needs to use acid-base solution to generate waste liquid, causing environmental pollution
[0007] CN101246962A discloses a method for treating natural graphite with ferrate liquid-phase oxidation. The method has mild preparation conditions and significantly improves the reversible capacity of modified graphite, but its cycle performance still cannot meet market demand

Method used

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  • High-capacity graphite material and preparation method as well as application thereof
  • High-capacity graphite material and preparation method as well as application thereof
  • High-capacity graphite material and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1 Preparation and detection of graphite composite material of the present invention

[0071] The preparation method of graphite composite material of the present invention may further comprise the steps:

[0072] 1) will D 50 200 g of artificial graphite of 10 μm is placed in 500 ml of ethanol, mechanically stirred at a stirring rate of 150 r / min, and dispersed evenly to obtain an artificial graphite suspension;

[0073] 2) Under stirring conditions, the D 50 Add 20 g of natural graphite of 5 μm into the artificial graphite suspension prepared in step 1), stir at 350 r / min for 1 hour, filter, and dry in a vacuum oven at 50° C. for 8 hours to obtain a mixture of artificial graphite and natural graphite (also known as graphite). mixture);

[0074] 4) Under stirring conditions, add the graphite mixture prepared in step 3) into the mixed solution of sulfuric acid hydrogen peroxide, continue to stir for 2 hours, filter, wash with distilled water until the pH is ...

Embodiment 2

[0076] Example 2 Preparation and detection of graphite composite material of the present invention

[0077] The preparation method of graphite composite material of the present invention may further comprise the steps:

[0078] 1) will D 50 200g of 20μm artificial graphite with D 50 40g of natural graphite with a diameter of 5 μm was added to a three-dimensional motion mixer at the same time, and mixed for 20 minutes to obtain a graphite mixture;

[0079] 2) adding the graphite mixture prepared in step 1) to 2L of NaBH with a mass concentration of 60% 4 In aqueous solution, heated to 60°C, mechanically stirred for 2h, filtered, washed with distilled water until no sodium ions were detected, dried in a vacuum oven at 50°C for 8h, to obtain a surface-modified graphite mixture.

[0080] According to the detection method of the present invention, the surface-modified graphite mixture prepared in step 2) was assembled into a battery, and the electrochemical performance test was ...

Embodiment 3

[0081] Example 3 Preparation and detection of graphite composite material of the present invention

[0082] The preparation method of graphite composite material of the present invention may further comprise the steps:

[0083] 1) will D 50 20μm artificial graphite 180g and D 50 30 g of natural graphite with a diameter of 10 μm was added to a three-dimensional motion mixer at the same time, and mixed for 30 minutes to obtain a graphite mixture;

[0084] 2) 27g epoxy resin is dissolved in 500ml ethyl acetate, makes the ethyl acetate solution of epoxy resin;

[0085] 3) Add the graphite mixture prepared in step 1) into the ethyl acetate solution of epoxy resin prepared in step 2), wherein the mass ratio of epoxy resin to graphite mixture is 1:8, stir for 1h, and mix well , dried in a vacuum oven at 150°C for 8 hours, and the solvent was removed to obtain a graphite mixture precursor;

[0086] 4) Under the protection of argon, the graphite mixture precursor prepared in step...

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Abstract

The invention relates to a high-capacity graphite material and a preparation method as well as application thereof. The high-capacity graphite material comprises artificial graphite and natural graphite, wherein the mass ratio of artificial graphite to natural graphite is 20:1 to 1:1. According to the preparation method, the artificial graphite and the natural graphite are uniformly mixed according to a certain mass ratio, and then surface modification is carried out on the mixture. The prepared graphite material has the advantages of high discharge capacity, high first efficiency, long cycle life, low cost and the like; the discharge capacity of the high-capacity graphite material can reach up to more than 350mAh/g (even reach up to more than 368mAh/g); a half-cell of the high-capacity graphite material charges and discharges at the 1C multiple power; after the high-capacity graphite material cycles for 100 times, the capacity retention ratio of the high-capacity graphite material is still more than 90% (even reaches up to more than 96.3%); the first efficiency reaches up to more than 95.5%; and the manufacturing cost is reduced by about 1-10%. The high-capacity graphite material provided by the invention not only can meet the requirement of a lithium ion power battery for the high multiplying power charge-discharge of the material, but also reduces the manufacturing cost of the cathode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a high-capacity graphite material, a preparation method thereof, and an application thereof. Background technique [0002] Since Japan's Sony Corporation successfully used carbon materials to prepare lithium-ion battery negative electrodes in 1991, lithium-ion battery carbon negative electrode materials have attracted much attention. In recent years, carbon anode materials for lithium-ion batteries have been widely used in various portable electronic products and communication tools. In today's world, energy is increasingly scarce, governments and major auto companies are stepping up the development of emission-free and pollution-free electric vehicles. As a new type of rechargeable battery, lithium-ion battery has the advantages of high voltage, high energy density, environmental protection, no pollution, and no memory effect. It is known as "the most promising chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00H01M4/587H01M10/0525C01B32/21
CPCY02E60/10
Inventor 杨红强苗艳丽李花张俊平
Owner 天津市贝特瑞新能源科技有限公司
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