A network silicon/graphite composite material for lithium battery and its preparation method

A composite material and network-like technology, which is applied in the field of network silicon/graphite composite materials and its preparation, can solve the problems of large specific surface area, low initial efficiency, and limited application, and achieve high surface area, high mechanical integrity, and avoid surface The effect of oxidation

Active Publication Date: 2019-04-19
漳州巨铭石墨材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent application CN102683649A uses resorcinol and formaldehyde to form a carbon airgel coating layer with a porous structure on the surface of nano silicon powder and ultrafine graphite. Although the surface structure and cycle performance of silicon carbon materials have been improved, the specific surface area of ​​the material Large, low efficiency for the first time, which limits its application in lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The present embodiment provides a kind of preparation method of network silicon / graphite composite material, it comprises the following steps:

[0038] Step 1: Mix graphite, silicon sulfate and starch aqueous solution, and keep it warm at 50°C for 40 minutes, and perform gelation treatment to obtain a semi-dry mixture gel;

[0039] Step 2: Add metal magnesium and magnesium chloride to the semi-dry mixture gel, and then high-energy grinding for 2 hours to obtain a silicon / graphite composite gel, and the nano-silicon particles formed by reduction are compounded with graphite in a three-dimensional scale, uniform The ground is embedded in the gap of three-dimensional graphite;

[0040] Step 3: Rinse the silicon / graphite composite gel with deionized water for 3 minutes to remove impurity ions in the silicon / graphite composite gel, then place it at -70°C for quick freezing and store it at -30°C , vacuum-dried under 20Pa vacuum condition to obtain a networked silicon / graphit...

Embodiment 2

[0045] The present embodiment provides a kind of preparation method of network silicon / graphite composite material, it comprises the following steps:

[0046] Step 1: Mix graphite, silicon sulfate and sucrose aqueous solution, and keep it warm at 60°C for 35 minutes, and perform gelation treatment to obtain a semi-dry mixture gel;

[0047] Step 2: Add metal potassium and sodium chloride to the semi-dry mixture gel, and then high-energy grind for 2 hours to obtain a silicon / graphite composite gel, which is reduced to form nano-silicon particles and composite with graphite in a three-dimensional scale , evenly embedded in the voids of three-dimensional graphite;

[0048] Step 3: Rinse the silicon / graphite composite gel with deionized water for 3 minutes to remove impurity ions in the silicon / graphite composite gel, then place it at -70°C for quick freezing and store it at -30°C , vacuum-dried under 20Pa vacuum condition to obtain a networked silicon / graphite composite material;...

Embodiment 3

[0053] The present embodiment provides a kind of preparation method of network silicon / graphite composite material, it comprises the following steps:

[0054] Step 1: Mix graphite, silicon chloride and starch aqueous solution, and keep it warm at 50°C for 40 minutes, and perform gelation treatment to obtain a semi-dry mixture gel;

[0055] Step 2: adding metal sodium and sodium chloride to the semi-dry mixture gel, and then high-energy grinding for 2 hours to obtain a silicon / graphite composite gel, which is reduced to form nano-silicon particles and composited with graphite in a three-dimensional scale , evenly embedded in the voids of three-dimensional graphite;

[0056] Step 3: Rinse the silicon / graphite composite gel with deionized water for 3 minutes to remove impurity ions in the silicon / graphite composite gel, then place it at -70°C for quick freezing and store it at -30°C , vacuum-dried under 20Pa vacuum condition to obtain a networked silicon / graphite composite mater...

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Abstract

The invention provides a reticular silicon / graphite composite material of a lithium battery and a preparation method thereof. The reticular silicon / graphite composite material of the lithium battery comprises nano-silicon and graphite. The graphite is of a three-dimensional reticular structure. Nano holes and mutually communicated micro pore channels are distributed inside the graphite. The nano-silicon is embedded in the voids of the three-dimensional reticular structure of the graphite. The preparation method of the reticular silicon / graphite composite material comprises the following steps of mixing up the graphite, a silicon source and a high-molecular carbon solution, subjecting the mixture to gelation treatment, adding a reducing agent and a molten salt, conducting the mechanical reaction to obtain a silicon / graphite composite gel, finally freezing and drying to obtain the reticular silicon / graphite composite material. The molar ratio of the graphite, the polymeric carbon, the silicon source, the reducing agent and the molten salt is (1-5):(1-3):1:(3-8):(3-15). The invention also provides a lithium battery, wherein the negative electrode of the lithium battery is prepared by the above reticular silicon / graphite composite material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative pole materials, and relates to a networked silicon / graphite composite material used for lithium battery negative poles and a preparation method thereof. Background technique [0002] Energy is an important material basis for human survival and development, the driving force behind various economic activities, and an important indicator of the level of social and economic development. With the gradual depletion of fossil fuels and the global warming it brings, many researchers have begun to pay attention to the new energy industry. Among them, lithium-ion batteries have become the research field of new energy due to a series of remarkable advantages such as high working voltage, large specific energy, light weight, small size, long cycle life, no memory effect, fast charging and discharging, and no environmental pollution. hotspot. [0003] The anode material of lithium ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆曾军堂王镭迪
Owner 漳州巨铭石墨材料有限公司
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