Carbon nanotube hard carbon composite negative electrode material with core-shell structure, preparation method and application

A technology of carbon nanotubes and negative electrode materials, applied in the direction of carbon nanotubes, nanocarbons, structural parts, etc., can solve the problems of hindering the application of hard carbon materials, low reversible capacity, voltage hysteresis, etc., to reduce irreversible capacity and increase lithium intercalation. Capacity, the effect of reducing the specific surface area

Active Publication Date: 2022-04-08
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Carbon nanotube hard carbon composite negative electrode material with core-shell structure, preparation method and application
  • Carbon nanotube hard carbon composite negative electrode material with core-shell structure, preparation method and application
  • Carbon nanotube hard carbon composite negative electrode material with core-shell structure, preparation method and application

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Effect test

Embodiment 1

[0062] This embodiment provides a method for preparing a carbon nanotube hard carbon composite negative electrode material with a core-shell structure, including:

[0063] Step 1: Take 100g of glucose, add 20g of carbon nanotube aqueous dispersion with a mass concentration of 0.1%, add 50ml of distilled water, stir evenly, and heat in a hydrothermal kettle at 4Mpa and 200°C for 5 hours to obtain a black powder;

[0064] Step 2: Wash the black powder obtained in Step 1 with deionized water until the filtrate is transparent and colorless, dry it at 100°C for 5 hours, put it in a tube furnace and heat it at a heating rate of 1°C / min to 1200°C, keep warm for 3 hours;

[0065] Step 3: Put the sample obtained in Step 2 into a chemical vapor deposition (CVD) device, and keep it at 1000° C. for 1 hour with argon:methane=1:1 ratio to obtain a carbon nanotube hard carbon composite negative electrode material with a core-shell structure.

[0066] In the obtained sample, the mass fractio...

Embodiment 2

[0080] This embodiment provides a method for preparing a carbon nanotube hard carbon composite negative electrode material with a core-shell structure, including:

[0081] Step 1: Take 100g of sucrose, add 50g of carbon nanotube aqueous dispersion with a mass concentration of 0.1%, add 10ml of distilled water, stir evenly, and heat in a hydrothermal kettle at 6Mpa and 150°C for 8 hours to obtain a black powder;

[0082] Step 2: Wash the black powder obtained in step 1 with deionized water until the filtrate is transparent and colorless, dry it at 100°C for 5 hours, put it into a tube furnace and heat it at a heating rate of 3°C / min to 1100℃, keep warm for 5 hours;

[0083] Step 3: Put the sample obtained in Step 2 into CVD equipment, and keep it at 1000° C. for 3 hours with nitrogen: acetylene = 1:1 ratio to obtain a carbon nanotube hard carbon composite negative electrode material with a core-shell structure.

[0084] In the obtained sample, the mass fraction of spherical ha...

Embodiment 3

[0087] This embodiment provides a method for preparing a carbon nanotube hard carbon composite negative electrode material with a core-shell structure, including:

[0088] 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;

[0089] Step 2: Wash the black powder obtained in Step 1 with deionized water until the filtrate is transparent and colorless, add 20 g of carbon nanotube aqueous dispersion with a mass concentration of 0.1%, add 50 ml of distilled water and mix evenly, and dry at 100 ° C for 10 hours. Put it into a tube furnace and heat it to 1150°C at a heating rate of 3°C / min under a nitrogen atmosphere, and keep it warm for 7 hours;

[0090] Step 3: Add 5g of polyvinylpyrrolidone (PVP) to the sample obtained in step 2, mix it evenly, put it into a ball mill, mill it at 200r / min for 1 hour, discharge it into a tube furnace, and keep it at 500°C for 2 hours in a ...

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Abstract

The embodiment of the present invention relates to a carbon nanotube hard carbon composite negative electrode material with a core-shell structure and its preparation method and application. The outer carbon coating is composed of; the inner core includes a first phase and a second phase; One or several combinations of these are hard carbon materials prepared from carbonized precursors, with a size range of 1um to 40um, and a Raman spectrum Id / Ig range of 0.7 to 0.9; the second phase is carbon nanotubes, with a size of 1nm to 50nm; the carbon coating layer is prepared by gas phase method, liquid phase method or solid phase method, and the range of Raman spectrum Id / Ig is 0.7~1.3; in the carbon nanotube hard carbon composite negative electrode material, according to the mass Score, first phase: second phase: carbon coating = (0, 100%]: (0, 60%]: (0, 40%].

Description

technical field [0001] The invention relates to the field of carbon nanotube hard carbon composite negative electrode materials, in particular to a carbon nanotube hard carbon composite negative electrode material with a core-shell structure, a preparation method and an 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 per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/158
CPCH01M4/362H01M4/366H01M4/583H01M4/625H01M10/0525C01B32/158Y02E60/10
Inventor 吉祥刘柏男罗飞李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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