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Negative electrode material used for lithium ion battery, preparation method, secondary and usage

A lithium-ion battery and negative electrode material technology, applied in the field of materials, can solve the problems of complex process and high cost, achieve excellent rate performance, and achieve the effect of charging and discharging

Inactive Publication Date: 2017-01-25
江西紫宸科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the graphite anode material prepared by this method can increase the diffusion rate of lithium ions during charge and discharge, the cost is high and the process is relatively complicated.

Method used

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  • Negative electrode material used for lithium ion battery, preparation method, secondary and usage
  • Negative electrode material used for lithium ion battery, preparation method, secondary and usage
  • Negative electrode material used for lithium ion battery, preparation method, secondary and usage

Examples

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preparation example Construction

[0032] The preparation method of the above-mentioned negative electrode material will be described in detail below.

[0033] The present invention provides a kind of preparation method for the battery negative electrode material of lithium ion, and described preparation method comprises:

[0034] Step 10, crushing the isotropic coke to obtain the average particle size D 50 Granular or spherical isotropic coke raw materials between 5 μm and 20 μm;

[0035] Among them, the isotropic coke may include one or more of pitch coke, petroleum coke, and metallurgical coke.

[0036] Step 20, subjecting the isotropic coke raw material to graphitization treatment at 2800°C to 3000°C to obtain the negative electrode material for lithium-ion batteries;

[0037] Among them, the average particle size D of the prepared negative electrode material 50 Between 5 μm and 20 μm.

[0038] In order to better understand the technical solution provided by the present invention, the following specific...

Embodiment 1

[0040] The preparation method of the negative electrode material includes the following steps (1)-(2).

[0041] (1) Crushing the isotropic coke of petroleum coke to obtain the average particle size D 50 The raw materials between 7μm and 8μm are mainly granular or spherical in shape;

[0042] (2) The raw materials are subjected to graphitization treatment at 3000° C. to obtain negative electrode materials for lithium ion batteries.

[0043] The negative electrode material obtained in this embodiment is tested by a Malvern MS2000 laser particle size analyzer, and its average particle diameter D 50 is 7.1 μm.

[0044] The negative electrode material obtained in this embodiment was tested by an X-ray diffraction analyzer, and the degree of graphitization was 88.2%.

[0045] The topography of the negative electrode material obtained in this embodiment is shown in figure 2 .

[0046]The prepared negative electrode material for lithium-ion batteries, conductive agent and binder...

Embodiment 2

[0048] The preparation method of the negative electrode material includes the following steps (1)-(2).

[0049] (1) Crushing the isotropic coke of petroleum coke to obtain the average particle size D 50 The raw materials between 5 μm and 6 μm are mainly granular or spherical in shape;

[0050] (2) The raw material is subjected to graphitization treatment at 2800° C. to obtain the negative electrode material for the lithium ion battery.

[0051] The negative electrode material obtained in this embodiment is tested by a Malvern MS2000 laser particle size analyzer, and its average particle diameter D 50 is 5.6 μm.

[0052] The negative electrode material obtained in this embodiment was tested by an X-ray diffraction analyzer, and the degree of graphitization was 82.2%.

[0053] The method for making the battery is the same as in Example 1.

[0054] The battery made of the negative electrode material obtained in this example was tested under the charge and discharge current de...

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Abstract

The invention discloses a negative electrode material used for a lithium ion battery, a preparing method, a secondary battery and usage . The negative electrode material is prepared through graphitization on a raw material of isotropic coke in particles or round-likely roundness; the capacity of the negative electrode material is not less than 300mAh / g, the specific surface area is smaller than 5m<2> / g, the degree of graphitization ranges from 80 percent to 90 percent, and the average particle diameter D50 ranges from 5 [mu]m to 20 [mu]m.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a negative electrode material for a lithium ion battery, a preparation method, a secondary battery and use. Background technique [0002] Since Sony launched the first lithium-ion battery in the 1990s, lithium-ion batteries have been widely used in various fields due to their light weight, high energy density, long service life, no memory effect, and environmental protection. At present, the negative electrode materials used in commercial lithium-ion batteries mainly include graphite, soft carbon, hard carbon, and lithium titanate. In contrast, graphite occupies most of the market in anode materials due to its advantages such as high capacity, low potential platform, and excellent cycle performance. [0003] However, during the charging and discharging process of lithium-ion batteries, lithium ions can only be inserted from the direction parallel to the graphite layer, which m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525C01B32/20C01B32/205
CPCH01M4/587H01M10/0525H01M2220/20Y02E60/10
Inventor 顾华清冯苏宁李辉刘芳张志清古力虎
Owner 江西紫宸科技有限公司
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