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Composite material and preparation method thereof

A composite material and material package technology, applied in the field of composite materials and their preparation, can solve problems such as poor mixing and dispersibility

Active Publication Date: 2020-10-23
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] An object of the present invention is to provide a composite material and a preparation method thereof, aiming at solving the technical problem of poor mixing and dispersibility of existing carbon-based active materials and alloyed active materials

Method used

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  • Composite material and preparation method thereof
  • Composite material and preparation method thereof
  • Composite material and preparation method thereof

Examples

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preparation example Construction

[0027] On the other hand, the embodiment of the present invention also provides a method for preparing a composite material, comprising the following steps:

[0028] S01: Provide carbon-based active material cores;

[0029] S02: preparing the alloyed active material layer on the surface of the carbon active material core;

[0030] S03: Prepare the shell layer on the surface of the alloyed active material layer.

[0031] The preparation method of the composite material provided by the embodiment of the present invention is prepared into a composite material composed of three layers, that is, a carbon-based active material core located at the core, an alloyed active material layer located in the middle, and an outer shell layer located on the outer surface. The composite material with unique structure can be used as negative electrode active material; the composite material obtained by this preparation method can not only achieve highly uniform dispersion of different active ma...

Embodiment 1

[0040] This embodiment provides a composite material: natural graphite is used as the carbon active material core, aluminum is used as the alloyed active material layer, and carbon material is used as the outer shell layer, wherein the D50 of natural graphite is 12 μm, and the alloyed active material layer is The thickness is 1 μm, the thickness of the shell layer is 100nm, and the mass percentage of aluminum is 40%; the composite material is used as the negative electrode active material to prepare the negative electrode, and the specific preparation process is as follows:

[0041] (1) Using natural graphite particles as the base material and pure aluminum as the sputtering target material, magnetron sputtering technology is used to deposit aluminum active materials on the surface of graphite particles to obtain an alloyed active material layer, and the thickness of the controlled film layer is about 3 μm .

[0042] (2) Using sucrose solution as a precursor, adopting high-tem...

Embodiment 2-7

[0048] The difference between embodiment 2-7 and embodiment 1 is that different carbon active substances are used, and the others are the same. The carbon active substances used are respectively: artificial graphite, soft carbon, hard carbon, MCMB, coke, graphene , the half-cell electrochemical performance test was carried out on the negative electrodes of Examples 2-7 under the condition of 0.2C rate, and compared with Example 1, the test results are shown in Table 1 below.

[0049] Table 1

[0050]

[0051] It can be seen from Table 1 that the anodes prepared with different carbon active materials all have good cycle stability and capacity retention, and the anode prepared by MCMB has the highest capacity retention.

[0052] Anodes based on alloyed active material layers with different thicknesses

[0053] The difference between Examples 8-16 and Example 1 is that the thickness of the aluminum active material layer is different as the alloyed active material layer, and t...

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a composite material, a preparation method thereof and a negative electrode. The composite material comprises a carbon active substance core, and an alloyed active substance layer and a shell layer which are coated on the surface of the carbon active substance core, wherein the alloyed active substance layer is positioned between the carbon active substance core and the shell layer. The composite material can realize high-degree uniform dispersion of different active substance phases, so that stressconcentration is effectively relieved, electrolyte can be isolated, side reactions are reduced, and the composite material with a special structure can be used as a negative electrode active materialof a lithium ion battery, so that the cycling stability of the negative electrode active material can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a composite material, a preparation method thereof, and a negative electrode. Background technique [0002] Lithium-ion batteries have been widely used in various consumer electronics devices, power tools, electric vehicles, energy storage and other fields due to their good electrochemical performance. However, the current commercial lithium-ion batteries mostly use graphite as the negative electrode material, and the theoretical capacity of graphite is limited (372mAh g -1 ), it is difficult to meet the performance requirements of high energy density and long battery life. Therefore, the development of new anode materials with high capacity has become an important research direction for lithium-ion batteries. Alloyed anode materials, such as silicon, germanium, aluminum, tin, antimony, zinc, etc., have high theoretical capacity and have good application p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/46H01M4/587H01M4/62H01M4/13H01M10/0525
CPCH01M4/366H01M4/587H01M4/38H01M4/463H01M4/628H01M4/13H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 唐永炳蒋春磊张晓明石磊
Owner SHENZHEN INST OF ADVANCED TECH
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