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A kind of preparation method of porous carbon ball negative electrode material for lithium battery

A technology of negative electrode material and porous carbon is applied in the field of preparation of porous carbon ball negative electrode material for lithium battery, which can solve the problems of poor electrochemical performance, poor electrode wettability, large irreversible capacity, etc. Low cost and the effect of alleviating film formation stability

Active Publication Date: 2021-10-22
四川瑞鞍新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the object of the present invention is to provide a method for preparing a porous carbon sphere negative electrode material for a lithium battery, which solves the problems of large particle size, large irreversible capacity, low reversible capacity, and low energy density of the existing negative electrode material. Insufficient battery life, high requirements for electrolyte, and poor wettability with electrodes, resulting in poor electrochemical performance and other problems

Method used

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  • A kind of preparation method of porous carbon ball negative electrode material for lithium battery
  • A kind of preparation method of porous carbon ball negative electrode material for lithium battery
  • A kind of preparation method of porous carbon ball negative electrode material for lithium battery

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Embodiment 1

[0033] 1) Under the protection of an argon gas atmosphere with a flow rate of 200mL / min, the tube furnace was heated to 450°C at a heating rate of 5°C / min, and kept for 30 minutes, and then acetylene gas was introduced at a flow rate of 200mL / min for 1 hour to obtain nano carbon spheres;

[0034] 2) Add alkaline substances (the molar ratio of sodium hydroxide and sodium carbonate is 1:3) to the nanocarbon spheres obtained in step 1), so that the mass ratio of nanocarbon spheres to alkaline substances is 1:4, and then at 200 Under the protection of mL / min argon gas flow rate, the temperature was raised to 900 °C for 30 min at a heating rate of 5 °C / min, then sintered for 4 h for activation treatment, cooled to room temperature, washed until neutral, and passed through a 300-mesh porous sieve after grinding Porous carbon spheres are obtained after sieving;

[0035] 3) Put the porous carbon spheres prepared in step 2) in a 2 mol / L nitric acid solution, and stir at 60°C for 3 hou...

Embodiment 2

[0037]1) Under the protection of argon gas at a flow rate of 100mL / min, the tube furnace was heated to 550°C at a heating rate of 5°C / min, kept for 40min, and then acetylene gas at a flow rate of 100mL / min was introduced for 2h for cracking reaction to obtain nano carbon spheres;

[0038] 2) Add alkaline substances (the molar ratio of potassium hydroxide and ammonium carbonate is 1:1) to the carbon nanospheres obtained in step 1), so that the mass ratio of carbon nanospheres to alkaline substances is 1:5, and then Under the protection of 100 mL / min inert gas flow rate, the temperature was raised to 800 °C at a heating rate of 5 °C / min for 40 min, and then sintered for 3 h for activation treatment, cooled to room temperature, washed to neutral, and passed through a 400-mesh porous sieve after grinding Porous carbon spheres are obtained after sieving;

[0039] 3) Put the porous carbon spheres prepared in step 2) in a 6mol / L nitric acid solution, and stir at a constant temperatu...

Embodiment 3

[0041] 1) Under the protection of argon gas at a flow rate of 400mL / min, the tube furnace was heated to 580°C at a heating rate of 10°C / min, kept for 30 minutes, and then acetylene gas at a flow rate of 400mL / min was introduced for 2 hours to obtain nano carbon spheres;

[0042] 2) Add sodium hydroxide to the nanocarbon spheres obtained in step 1), so that the mass ratio of nanocarbon spheres to alkaline substances is 1:8, and then under the protection of 400 mL / min inert gas flow rate, according to 10 ℃ / The heating rate was raised to 900°C for 30 minutes, then sintered for 1 hour for activation treatment, cooled to room temperature, washed until neutral, and then sieved with a 300-mesh porous sieve to obtain porous carbon spheres after grinding;

[0043] 3) Put the porous carbon spheres prepared in step 2) in a 5 mol / L nitric acid solution, and stir at 90°C for 2 hours at a constant temperature. After the reaction, filter with suction, wash until neutral, and dry to obtain ...

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Abstract

The invention discloses a preparation method of a porous carbon ball negative electrode material for lithium batteries. The method obtains nano carbon balls by depositing a carbon source gas under the conditions of no catalyst and low temperature, and then is activated by alkali and acidified with strong acid, The porous carbon ball negative electrode material was obtained. The invention not only increases the surface defects of the carbon ball, effectively shortens the diffusion and migration path of lithium ions, but also increases the surface functional groups and specific surface area of ​​the porous carbon ball material, effectively relieves the film-forming stability of the nano-porous carbon ball in the material, and is conducive to high-current charging discharge to ensure proper volumetric energy density and coulombic efficiency of the negative electrode material. The nanoporous carbon ball negative electrode material for lithium ion battery prepared by the invention has small and uniform particle size and large specific surface area. Under the mechanism of high current charge and discharge, the specific capacity of the first discharge is nearly 1400 mAh / g, and the specific capacity can be stable after 100 cycles. Above 400mAh / g, it has high specific capacity, good rate performance and cycle performance, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a porous carbon ball negative electrode material for lithium batteries. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, game consoles, notebook computers, electric vehicles, aerospace and new energy due to their high energy density, high open circuit voltage, good cycle performance, no memory effect, green environmental protection, and small self-discharge. power grid and other fields. Lithium-ion batteries have always been a hot spot of research and development by scholars around the world. Anode materials are one of the key factors affecting the comprehensive electrochemical performance of lithium-ion batteries. [0003] Carbon materials are the earliest commercialized lithium battery anode materials. This is because the carbon-based material has good electrical conductivity and mech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318C01B32/348H01M4/587H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B32/318C01B32/348H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈建彭川刘平廖明东唐成玉何宇
Owner 四川瑞鞍新材料科技有限公司
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