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Hard carbon negative electrode material with multilayer core-shell structure and preparation method and application thereof

A technology of multi-layer core-shell structure and negative electrode material, applied in the direction of negative electrode, structural parts, battery electrode, etc., can solve the problems such as hindering the application of hard carbon materials, low reversible capacity, and low first effect.

Inactive Publication Date: 2021-08-31
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at present, hard carbon materials have problems such as low first effect, low reversible capacity (200mAh / g-400mAh / g), and voltage hysteresis, which hinder the further application of hard carbon materials.

Method used

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  • Hard carbon negative electrode material with multilayer core-shell structure and preparation method and application thereof
  • Hard carbon negative electrode material with multilayer core-shell structure and preparation method and application thereof
  • Hard carbon negative electrode material with multilayer core-shell structure and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] This embodiment provides a method for preparing a hard carbon negative electrode material with a multilayer core-shell structure, including:

[0070] Step 1: Take 100g of glucose, add 50ml of distilled water, stir evenly, and heat in a hydrothermal kettle at 5Mpa and 200°C for 5 hours to obtain a black powder;

[0071] Step 2: Wash the black powder obtained in Step 1 with deionized water until the filtrate is transparent and colorless, and after drying at 100°C for 10 hours, put it into a tube furnace and heat it at a heating rate of 3°C / min to 900°C, keep warm for 2 hours;

[0072] Step 3: Heat the sample obtained in step 2 to 400°C at a heating rate of 3°C / min in an air atmosphere, and keep it warm for 4 hours;

[0073] Step 4: Put the sample obtained in Step 3 into a chemical vapor deposition (CVD) device, and keep it at 900° C. for 1 hour with argon:methane=1:1 ratio to obtain a hard carbon negative electrode material with a multilayer core-shell structure.

[007...

Embodiment 2

[0089] This embodiment provides a method for preparing a hard carbon negative electrode material with a multilayer core-shell structure, including:

[0090] Step 1: Take 100g of glucose, add 50ml of distilled water, stir evenly, and heat in a hydrothermal kettle at 6Mpa and 150°C for 5 hours to obtain a black powder;

[0091] Step 2: Wash the black powder obtained in Step 1 with deionized water until the filtrate is transparent and colorless, and after drying at 100°C for 10 hours, put it into a tube furnace and heat it at a heating rate of 3°C / min to 1000°C, keep warm for 6 hours;

[0092]Step 3: Heat the sample obtained in step 2 to 600°C at a heating rate of 3°C / min in an air atmosphere, and keep it warm for 2 hours;

[0093] Step 4: Put the sample obtained in Step 3 into CVD equipment, and keep it at 1000° C. for 3 hours with nitrogen: acetylene = 1:1 ratio to obtain a hard carbon negative electrode material with a multilayer core-shell structure.

[0094] In the obtaine...

Embodiment 3

[0097] This embodiment provides a method for preparing a hard carbon negative electrode material with a multilayer core-shell structure, including:

[0098] Step 1: Take 100g of glucose, add 50ml of distilled water, stir evenly, and heat in a hydrothermal kettle at 5Mpa and 200°C for 5 hours to obtain a black powder;

[0099] Step 2: Wash the black powder obtained in Step 1 with deionized water until the filtrate is transparent and colorless, and after drying at 100°C for 10 hours, put it into a tube furnace and heat it at a heating rate of 3°C / min to 800°C, keep warm for 10 hours;

[0100] Step 3: Heat the sample obtained in step 2 to 500°C at a heating rate of 3°C / min in an air atmosphere, and keep it warm for 2 hours;

[0101] Step 4: Add 5 g of polyvinylpyrrolidone (PVP) to the sample obtained in Step 3, mix it evenly, put it into a ball mill, mill it at 200 r / min for 1 hour, discharge it into a tube furnace, and keep it at 1000 ° C for 3 hours in a nitrogen atmosphere ,...

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Abstract

The embodiment of the invention relates to a hard carbon negative electrode material with a multilayer core-shell structure and a preparation method and application thereof. The size range of the hard carbon negative electrode material is 1-50 mum, and the hard carbon negative electrode material is composed of a hard carbon inner core, a hard carbon middle layer and a carbon coating layer; the hard carbon inner core is a hard carbon material prepared by taking one or more of glucose, cane sugar, polyvinylpyrrolidone, starch polyvinylidene fluoride, novolac epoxy resin or polyvinyl chloride as a carbonization precursor; the size range is 1-40 mum, and the Raman spectrum Id / Ig range is 0.7-0.9; the hard carbon middle layer is a hard carbon porous oxide layer, the porosity is 1%-80%, the pore size is 0.005-2 um, and the Raman spectrum Id / Ig range is 0.8-1.5; the carbon coating layer is prepared by a gas phase method, a liquid phase method or a solid phase method, and the Raman spectrum Id / Ig range is 0.7-1.3; in the hard carbon negative electrode material, the mass fraction of the hard carbon inner core to the hard carbon middle layer to the carbon coating layer is equal to (0, 100%) to (0, 50%) to (0, 30%).

Description

technical field [0001] The invention relates to the field of hard carbon negative electrode materials, in particular to a hard carbon negative electrode material with a multilayer core-shell structure and a preparation method and application thereof. Background technique [0002] At present, carbon materials have been widely used as negative electrode materials in lithium-ion batteries. [0003] Carbon negative electrode materials mainly include artificial graphite, natural graphite, carbon nanotubes, hard carbon and other carbon materials. Among them, hard carbon material, as a kind of amorphous carbon, has a high reversible capacity, theoretically reaching 700mAh / g~1000mAh / g, far exceeding the theoretical capacity of graphitized carbon of 372mAh / g, and the irregular structure of hard carbon can ensure the structural stability during charging and discharging, so that lithium batteries can have a longer cycle life and better rate performance . [0004] But at present, har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/366H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 吉祥刘柏男罗飞李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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