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Electric-conduction composite material, negative electrode material prepared from electric-conduction composite material, and secondary battery

A conductive composite material and secondary battery technology, which is applied in the direction of secondary batteries, batteries, battery electrodes, etc., can solve the problems of reducing overall structural stability, insufficient commercial value of secondary batteries, and structural rupture.

Inactive Publication Date: 2018-08-17
硅力能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high-capacity technical means of secondary batteries used in the prior art often have the following limitations to be overcome. For example, although the charge-discharge capacity increases and the energy density becomes higher, the cycle performance is insufficient, or a cumulative charge-discharge cycle is reached. After several times, the capacity will gradually drop, and after a certain number of times, it will drop sharply, or after many times of charging and discharging, the material used in the secondary battery will cause the structure to crack due to the repeated expansion and contraction of the volume, which will greatly reduce the overall capacity. structural stability
The above-mentioned restrictions on use are not sufficient as a secondary battery for commercial use, and cannot meet the requirements of the market.
[0004] In addition, in recent years, the demand for rapid charge and discharge of secondary batteries has gradually increased, but when the charge and discharge rate of the battery is increased, its charge and discharge capacity will be significantly reduced, and the cycle life of the battery will be significantly affected. With fast charge and discharge, high initial capacitance and long cycle life, it has become an urgent problem to be solved in the market

Method used

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  • Electric-conduction composite material, negative electrode material prepared from electric-conduction composite material, and secondary battery
  • Electric-conduction composite material, negative electrode material prepared from electric-conduction composite material, and secondary battery
  • Electric-conduction composite material, negative electrode material prepared from electric-conduction composite material, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 - Preparation of Conductive Composite Material General Formula-Core Part / Inner Cladding Layer / Outer Cladding Layer (Si / SiOx / C:N, 0.3≤x≤1.5)

[0056] Step 1: Select silicon powder (particle size distribution of 1nm ~ 10μm) as the core part, and place it in a cavity that can be vacuumed, and the vacuum of the cavity is evacuated to 5x10 -4 Torr. The above-mentioned cavity can be any reactor with heating, and can be selected from reactors capable of continuous or batch processing according to the special purpose, such as: fluidized bed reactor, rotary furnace, vertical moving bed reactor, tunnel furnace , batch furnace and rotary kiln. The above-mentioned silicon powder body can be spherical or irregular.

[0057] Step 2: Then the cavity is fed with oxygen and heated to 800°C to form an inner cladding layer composed of silicon oxide on the surface of the core part composed of silicon powder. The general formula of silicon oxide is SiOx(0.3 ≤x≤1.5), wherein whe...

Embodiment 2

[0060] Embodiment 2 - Preparation of conductive composite material general formula-core part / inner cladding layer / outer cladding layer (Si / SiOx / C:F, 0.3≤x≤1.5);

[0061] Step 1: Select silicon powder (with a particle size distribution of 1nm to 5μm) as the core, and place it in a cavity that can be vacuumed, and the vacuum of the cavity is evacuated to 5x10 -4 Torr. The above-mentioned chamber can be any reactor with heating, which has been described in Example 1 and will not be repeated here. The above-mentioned silicon powder body can be spherical or irregular.

[0062] Step 2: Then the cavity is fed with oxygen and heated to 800°C to form an inner cladding layer composed of silicon oxide on the surface of the core part composed of silicon powder. The general formula of silicon oxide is SiOx(0.3 ≤x≤1.5), wherein when the oxygen flow rate is changed from 10 standard cubic centimeters per minute (sccm) to 50 standard cubic centimeters per minute (sccm), X of the general form...

Embodiment 3

[0065] Example 3 - Preparation of Conductive Composite Material General Formula-Core Part / Inner Cladding Layer / Outer Cladding Layer (Si / SiNx / C:N, 0.1≤x≤0.8)

[0066] Step 1: Select silicon powder (with a particle size distribution of 1nm to 5μm) as the core, and place it in a cavity that can be vacuumed, and the vacuum of the cavity is evacuated to 5x10 -4 Torr. The above-mentioned chamber can be any reactor with heating, which has been described in Example 1 and will not be repeated here. The above-mentioned silicon powder body can be spherical or irregular.

[0067] Step 2: Then the cavity is fed with ammonia gas and heated to 800°C to form an inner cladding layer composed of silicon nitride on the surface of the core part composed of silicon powder. The general formula of silicon nitride is SiNx (0.1≤x≤0.8), wherein when the flow rate of ammonia gas is changed from 10 standard cubic centimeters per minute (sccm) to 50 standard cubic centimeters per minute (sccm), X of the...

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Abstract

The invention discloses an electric-conduction composite material, a negative electrode material prepared from the electric-conduction composite material, and a secondary battery. The electric-conduction composite material comprises: a core part, wherein the core part comprises a first material selected from a group comprising a fourth main group element (IVA), a metal, a metal compound or an alloy; an inner coating layer, wherein the surface of the core part is coated with the inner coating layer, and the inner coating layer is prepared from a group comprising the oxides, the nitrides or thecarbides of the first material; and an outer coating layer, wherein the surface of the inner coating layer is coated with the outer coating layer, and the outer coating layer is prepared from a carbonmaterial and at least a second material (doping material) containing a halogen or a fifth main group element (VA).

Description

technical field [0001] The invention provides a conductive composite material and the prepared negative electrode material and secondary battery, especially a good conductive composite material and the prepared negative electrode material and secondary battery. Background technique [0002] Recently, the trend of portability, miniaturization, light weight, and high performance in electronic devices, information products, and communication industries is rapidly growing. Accordingly, high-performance batteries, especially lithium-ion secondary batteries, are used as energy sources for these portable electronic devices and their demand is rapidly increasing. Secondary batteries can be used repeatedly by charging and discharging as energy sources for portable electronic devices for information and communication, electric bicycles or electric vehicles. Since the usage time of these products depends on the secondary battery as a key component, consumers' demand for a high-capacit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/587H01M10/0525
CPCH01M4/366H01M4/38H01M4/386H01M4/483H01M4/587H01M10/0525H01M2220/30H01M2220/20Y02E60/10
Inventor 郑尹玮刘全璞
Owner 硅力能股份有限公司
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