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Hard carbon composite material, as well as preparation method and application thereof

A composite material and hard carbon technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of active lithium consumption, low first coulombic efficiency and cycle performance of lithium-ion batteries, and achieve improved stability and improved first coulombic efficiency And cycle performance, the effect of improving the rate charge and discharge performance

Inactive Publication Date: 2021-09-21
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hard carbon has an intrinsic amorphous structure and more pores, which will cause it to consume a large amount of active lithium when it intercalates lithium for the first time, resulting in lower initial Coulombic efficiency and cycle performance of lithium-ion batteries.

Method used

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  • Hard carbon composite material, as well as preparation method and application thereof
  • Hard carbon composite material, as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0039] A second aspect of the present invention provides a method for preparing a hard carbon composite material, comprising the following steps:

[0040] 1) heat-treating the first carbon-containing material to obtain a hard carbon precursor;

[0041] 2) Carrying out carbonization treatment on the hard carbon precursor to obtain the hard carbon material;

[0042] 3) in a sealed ball mill containing an inert gas, the hard carbon material, the second carbonaceous material and metal lithium are ball milled to obtain an intermediate hard carbon material;

[0043] 4) Coating the intermediate hard carbon material to obtain a hard carbon composite material; the coating material in the coating treatment includes at least the third carbonaceous material.

[0044] It can be understood that the preparation method of the hard carbon composite material of the present invention may specifically include the following steps: 1) screening, cleaning, drying and pulverizing the first carbonace...

Embodiment 1

[0097] The preparation method of the hard carbon composite material of the present embodiment comprises the following steps:

[0098] 1) 100g sucrose (the first carbon-containing material) is heat-treated under air atmosphere to obtain a hard carbon precursor;

[0099] Wherein, the temperature of heat treatment is 250°C, and the time of heat treatment is 12h;

[0100] 2) the hard carbon precursor obtained in step 1) is pulverized, and in an Ar atmosphere, the pulverized hard carbon precursor is carbonized to obtain a hard carbon material;

[0101] Wherein, the D50 of the pulverized hard carbon precursor is 20 μm, the temperature of the carbonization treatment is 750° C., and the time of the carbonization treatment is 5 hours;

[0102] 3) in a sealed ball mill filled with argon, the hard carbon material, lithium metal and conductive carbon black obtained in step 2) are ball milled to obtain an intermediate hard carbon material;

[0103] Wherein, the mass ratio of hard carbon ...

Embodiment 2

[0107] The preparation method of the hard carbon composite material of this embodiment is basically the same as that of Example 1, the only difference being that the first carbonaceous material in step 1) is bagasse.

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Abstract

The invention provides a hard carbon composite material as well as a preparation method and application thereof. The hard carbon composite material comprises a hard carbon core, a pre-lithiation layer and a coating layer, wherein at least part of the surface of the hard carbon inner core is coated with the pre-lithiation layer, at least part of the surface of the pre-lithiation layer is coated with the coating layer, and the coating layer at least comprises a carbon material. The hard carbon composite material can improve the cycle performance and the first coulombic efficiency of the lithium ion battery.

Description

technical field [0001] The invention relates to a hard carbon composite material, a preparation method and an application thereof, and belongs to the technical field of lithium ion batteries. Background technique [0002] At present, in order to improve the mileage of electric vehicles, the research on power batteries is gradually developing towards fast charging. The current fast-charging battery is mainly realized by reducing the areal density and compaction density of the pole piece, but the reduction of the areal density and compaction density of the pole piece will reduce the energy density of the lithium-ion battery, which is not good for the electric vehicle consumer market. willing to accept the result. [0003] In the prior art, using hard carbon and graphite together as the negative electrode active material can not only improve the rate performance of the battery, but also further increase the energy density of the battery, enabling electric vehicles to have both...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/133H01M4/36H01M4/583H01M4/62
CPCH01M4/587H01M4/5835H01M4/364H01M4/625H01M4/133Y02E60/10
Inventor 邱昭政梁世硕李文龙赵育松张永庆
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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