Preparation method and application of in-situ carbon-coated silicon dioxide carbon composite material

A technology of carbon composite materials and silicon dioxide, applied in the direction of secondary batteries, electrochemical generators, active material electrodes, etc., can solve the problems of uneven coating, poor conductivity of silicon dioxide, and no obvious improvement in battery cycle performance, etc. problem, to achieve the effect of simple and controllable method, improving conductivity, improving stability and cycle performance

Inactive Publication Date: 2020-04-17
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the products obtained by carbon coating are generally not uniformly coated. Due to the poor conductivity of silicon dioxide itself, the cycle performance of the battery has not been significantly improved by carbon coating in the later stage.

Method used

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  • Preparation method and application of in-situ carbon-coated silicon dioxide carbon composite material
  • Preparation method and application of in-situ carbon-coated silicon dioxide carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 0.6 g of sucrose, 0.2 g of PVA (polyvinyl alcohol), 5 ml of ammonia solution to 50 ml of ethanol, add 2 g of tetraethyl orthosilicate dropwise, stir at room temperature, transfer the solution to the reactor for hydrothermal reaction at high temperature and high pressure, A black precipitate was obtained at 180°C for 5 h. The precipitate was washed and dried, and the dried product was placed in a furnace, fed with nitrogen, and kept at 600°C for 5 h to obtain the product SiO 2 @C material; product XRD such as figure 1 As shown, the electrochemical performance of the lithium battery is as follows figure 2 shown.

Embodiment 2

[0026] Add 1.2 g glucose, 0.5 g PVP (polyvinylpyrrolidone), 5 ml ammonia solution to 50 ml isopropanol, add 2 g methyl orthosilicate dropwise, stir at room temperature, transfer the solution to a reaction kettle for hydrothermal treatment at high temperature and high pressure Reaction, 150 ° C for 10 h to get a black precipitate, wash and dry the precipitate, put the dried product in a furnace, blow nitrogen, keep it at 700 ° C for 3 h, and the product is SiO 2 @C material.

Embodiment 3

[0028] Add 1 g of glucose, 0.3 g of PVP (polyvinylpyrrolidone), and 5 ml of ammonia solution into 50 ml of ethanol, add 2 g of tetraethyl orthosilicate dropwise, stir at room temperature, transfer the solution to a reactor for hydrothermal reaction at high temperature and high pressure, 160 ℃ for 5 h to get a black precipitate, wash and dry the precipitate, place the dried product in a furnace, blow in nitrogen, keep it at 650 °C for 4 h, and the product is SiO 2 @C material.

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Abstract

The invention provides a preparation method and application of an in-situ carbon-coated silicon dioxide carbon composite material. The method comprises the following steps: mixing and dissolving a carbon source, a surfactant and alkali liquor, adding an organic silicon source, stirring, transferring a solution into a reaction kettle, carrying out high-temperature and high-pressure hydrothermal reaction to obtain a black precipitate, drying the black precipitate, putting the dried substance into a furnace, introducing shielding gas, and carrying out reaction at high temperature to obtain the product silicon dioxide-carbon composite material. The process is simple and feasible, the raw materials are rich and cheap, and the obtained silicon dioxide material is uniform in particle distribution, uniform in carbon coating and high in conductivity and can be applied to the field of lithium battery negative electrode materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a method for preparing an in-situ carbon-coated silica-carbon composite material. Background technique [0002] Improving the specific energy of power batteries is the most effective way to solve the "range anxiety" of electric vehicles at this stage. According to authoritative data, lithium-ion power batteries must reach the development goal of 300 W h / kg by 2020. At present, the only feasible technical route is: high-nickel ternary positive electrode material NCM 811, NCA or lithium-rich manganese base with silicon-based negative electrode Material. [0003] Studies have shown that for every 500 mA h / g increase in the specific capacity of the negative electrode material, the specific energy of the lithium-ion battery can be increased by 15%. The theoretical specific capacity of silicon-based negative electrode materials can reach up to 4200 mA h / g,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/48H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 胡培徐杉史德友
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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