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Spherical core-shell structure mixed graphite @ hard carbon composite material as well as preparation method and application thereof

A core-shell structure and composite material technology, applied in structural parts, electrical components, electrochemical generators, etc., can solve the problems of long lithium ion intercalation and extraction distance, limited application of natural graphite, low first charge and discharge efficiency, etc. Cyclic stability performance, alleviation of volume expansion problem, low cost effect

Active Publication Date: 2019-04-12
大理宸宇储能新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used flake graphite has a complete crystallization and large flakes, resulting in a long intercalation and deintercalation distance of lithium ions, which limits the further application of natural graphite in high-performance secondary batteries.
Microcrystalline graphite is composed of many randomly oriented tiny crystals and is isotropic. As a negative electrode material for secondary batteries, it has the advantages of lower cost, high specific capacity, and small change in charge and discharge volume. Disadvantages such as low efficiency, poor cycle performance, and low tap density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Take 50g of microcrystalline graphite and 50g of flake graphite and place them in a ball mill tank for ball milling. The ball-to-material ratio is 30:1, the rotation speed is 400rpm, and the ball milling time is 8h. Mix graphite. Add 1.4g of fructose and 0.6g of sodium dodecyl sulfonate into 100ml of ethanol, stir at room temperature until the solution is clear, then pour 18g of the resulting mixed graphite into it, and ultrasonicate for 2 hours to prepare a uniformly dispersed spray mixture. Under an argon atmosphere, set the gas flow rate through the spray system to 10L / min, the spray volume to 2mL / min, and the atomization pressure to 5MPa. The spray mixture was spray-dried at 200°C in the spray drying equipment, and the spray-dried crude oil was collected. product; the obtained spray-dried crude product was placed in a tube furnace in an inert atmosphere, and further heat-treated at a temperature of 1100°C, the heating rate was 5°C / min, and the holding time was 3h; th...

Embodiment 2

[0038] Take 70g of microcrystalline graphite and 30g of flake graphite and place them in a ball mill tank for ball milling. The ball-to-material ratio is 30:1, the rotation speed is 400rpm, and the ball milling time is 8h. Mix graphite. Add 2g of glucose and 1g of sodium dodecylsulfonate to 100ml of ethanol, stir at room temperature until the solution is clear, then pour 17g of the resulting mixed graphite into it, and ultrasonicate for 2 hours to prepare a uniformly dispersed spray mixture. Under an argon atmosphere, set the spray volume through the spray system to 5mL / min, the atomization pressure to 15MPa, and the gas flow rate to 20L / min, spray the spray mixture at 160°C in the spray drying equipment, and collect the spray-dried crude product; the obtained spray-dried crude product was placed in a tube furnace in an inert atmosphere, and further heat-treated at a temperature of 1100°C, the heating rate was 5°C / min, and the holding time was 3h; the heat-treated product was ...

Embodiment 3

[0041] Take 80g of microcrystalline graphite and 20g of flake graphite and place them in a ball milling tank for ball milling. The ball-to-material ratio is 30:1, the rotating speed is 400rpm, and the ball milling time is 8h. Mix graphite. Add 2g of lignin and 1g of cetyltrimethylammonium bromide into 100ml of ethanol, stir at room temperature until the solution is clear, then pour 17g of the resulting mixed graphite into it, and ultrasonicate for 2 hours to prepare a uniformly dispersed spray mixture. Under an argon atmosphere, set the gas flow rate through the spray system to 10L / min, the spray volume to 2mL / min, and the atomization pressure to 5MPa. The spray mixture was spray-dried at 240°C in the spray drying equipment, and the spray-dried crude oil was collected. product; the obtained spray-dried crude product was placed in a tube furnace in an inert atmosphere, and further heat-treated at a temperature of 800°C, the heating rate was 10°C / min, and the holding time was 6h...

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Abstract

The invention discloses a spherical core-shell structure mixed graphite @ hard carbon composite material as well as a preparation method and an application thereof. The spherical core-shell structuremixed graphite @ hard carbon composite material has a core-shell structure; the core is formed by mixing microcrystalline graphite and flake graphite, and the shell is a hard carbon layer. The preparation method comprises the following steps of mixing the flake graphite and the microcrystalline graphite through ball milling, and dispersing with a carbohydrate carbon source and a surfactant into asolution system, wherein the obtained mixed solution is subjected to spray drying to obtain a precursor; and the precursor is placed in an inert atmosphere for heat treatment to obtain the composite material. The method is easily available in raw materials, simple in preparation process and high in repeatability; the prepared spherical core-shell structure mixed graphite @ hard carbon composite material has the advantages of rich active sites, large specific surface area, high conductivity and the like, and when the composite material is applied to a lithium ion battery negative electrode material, high specific capacity, high cycling stability and excellent rate performance are shown, and wide industrial application prospect is achieved.

Description

technical field [0001] The invention relates to a spherical core-shell structure mixed graphite@hard carbon composite material and its preparation method and application, in particular to a composite material with a spherical core-shell structure in which low graphitized hard carbon is coated with high graphitized mixed graphite The preparation method thereof and the application as a carbon negative electrode material of a lithium ion battery belong to the field of secondary batteries. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, large specific energy, long life, low self-discharge rate and wide temperature range, and have become the mainstream energy storage system at present. Anode materials are one of the important factors that determine the overall performance of lithium-ion batteries. At present, the development of anode materials for lithium-ion batteries mainly focuses on carbon materials, transition metal compound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张治安胡均贤尹盟赖延清张凯李劼
Owner 大理宸宇储能新材料有限公司
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