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Graphite modification method and graphite/silicon composite material

A graphite modification, graphite technology, applied in the direction of graphite, electrode shape/type, electrode, etc., can solve problems such as unsatisfactory electrochemical performance, and achieve the effect of improving surface electrochemical activity, simple process, high initial capacity and efficiency

Inactive Publication Date: 2018-02-23
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified graphite obtained by this invention is directly used as negative electrode material, and its electrochemical performance is not ideal

Method used

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  • Graphite modification method and graphite/silicon composite material
  • Graphite modification method and graphite/silicon composite material
  • Graphite modification method and graphite/silicon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Put 1kg graphite powder (particle size 1-20μm, average particle size 3.5μm), 1kg stainless steel balls, 7kg deionized water into the ball mill tank, and ball mill at 650r / min for 2 hours to obtain a slurry containing modified graphite and ball milling media material.

[0046] Add the graphite powder / deionized water mixture and 1.22kg of silica (particle size 5-100nm, average particle size 30nm) obtained after ball milling in accordance with the above process into the kneader tank, kneading and dispersing for 2h; The silica / deionized water mixture is put into a blast oven and dried at 120°C for 48 hours to remove water. The dried graphite / silica mixture is mechanically crushed and the powder obtained is put into a rubber sheath, and the pressure Compression molding under the conditions of 185Mpa and 10min holding time to obtain a graphite / silica porous bulk material. Cut the above graphite / silica porous bulk material to obtain a graphite / silica with a size of 50×50×5mm Por...

Embodiment 2

[0049] Put 1kg graphite powder (particle size 1-20μm, average particle size 3.5μm), 6kg corundum balls, 8kg ethanol into a ball mill tank, and ball mill at 900r / min for 6h to obtain a slurry containing modified graphite and ball milling media.

[0050] Add the graphite powder / ethanol mixture obtained by ball milling according to the above process, 1.22kg of silica (particle size 5-100nm, average particle size 30nm), and 1kg ethanol into the coarse mill feeder, and coarsely mill and disperse for 1 hour; The graphite / silica / ethanol mixture is put into a vacuum oven and dried at 120°C for 48 hours to remove moisture. The powder obtained after the drying of the graphite / silica mixture is mechanically crushed is packed into a rubber sheath. Press molding under the conditions of pressure 185Mpa and 10min holding time to obtain graphite / silica porous bulk material. Cut the above graphite / silica porous bulk material to obtain graphite / two pieces with a size of 50×50×5mm Silicon oxide por...

Embodiment 3

[0053] 1kg graphite powder (particle size 1-20μm, average particle size 3.5μm, scanning electron microscope picture as figure 1 Shown), 6kg of zirconia balls and 9kg of deionized water are put into a ball milling tank, and ball milled at a speed of 1000 r / min for 9 hours to obtain a slurry containing modified graphite and ball milling media. The scanning electron microscope picture of the graphite powder after ball milling is as follows figure 2 Shown.

[0054] Add the mixture of graphite powder / deionized water, 1.22kg of silica (particle size 5-100nm, average particle size 30nm), and 1kg of deionized water obtained after ball milling according to the above process into the planetary mixer tank, stir and disperse 2h; Put the above-mentioned mixture containing graphite / silica / deionized water into a blast oven, dry at 120°C for 48 hours to remove water, and mechanically crush the dried graphite / silica mixture to obtain powder The body is put into a rubber sheath, and molded under ...

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Abstract

Disclosed is a graphite modification method. The graphite modification method comprises the steps of performing ball milling on graphite powder, grinding balls and a ball grinding medium at the mass ratio of 1:(1-10):(7-50) at the rotary speed of 650-1,200r / min for 2-48h. The graphite / silicon dioxide porous electrode and the graphite / silicon composite material prepared from graphite obtained by the modification method provided by the invention obtain excellent electrochemical performance.

Description

Technical field [0001] The invention belongs to the technical field of graphite modification, and specifically relates to a graphite modification method and a graphite / silicon composite material. Background technique [0002] Graphite is often used as a substrate and framework material due to its excellent electrical conductivity, thermal conductivity and electrochemical properties, and forms composite materials with other materials to achieve special composite material characteristics and functions. Electrochemical methods such as electrolysis and electrodeposition can effectively ensure the electrical contact between different materials and are often used in the preparation of composite materials. When using electrochemical methods to prepare graphite-based composite materials, it was found that the nucleation and growth of other materials on the graphite surface can only be carried out in a few specific parts of the graphite surface (Science, 2000, 290, 2120; J. Phys. Chem. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525C01B32/21C25B11/03C25B11/04
CPCC01P2004/61C25B11/04C25B11/031H01M4/362H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 齐小鹏杨娟玉卢世刚胡易琛史碧梦赵立川张杰
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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