Preparation method of high-performance fluorinated peanut shell hard carbon electrode material

A technology for fluorinated peanuts and electrode materials, which is applied in fluorinated carbon, battery electrodes, electrochemical generators, etc., can solve the problems of high production cost and poor rate performance, and achieve the effect of low cost and high capacity

Inactive Publication Date: 2020-03-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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[0006] 1. Poor magnification perf...

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  • Preparation method of high-performance fluorinated peanut shell hard carbon electrode material
  • Preparation method of high-performance fluorinated peanut shell hard carbon electrode material

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Embodiment 1

[0041]A preparation method of a high-performance fluorinated peanut shell hard carbon electrode material, comprising the following steps:

[0042] Step 1, crushing the peanut shells, crushing the peanut shells to less than 3mm, soaking the crushed peanut shells in deionized water for 2 hours to remove part of the water-soluble impurities;

[0043] Step 2, activation, soak the peanut shells obtained in step 1 in a 7wt% KOH solution for 2 hours and then place them in an oven at 80°C for 2 hours. The amount of the KOH solution is 3% of the mass of the peanut shells. times;

[0044] Step 3, pyrolysis, the peanut shells obtained in step 2 are pyrolyzed at 800 degrees Celsius for 5 hours under the protection of argon gas, and after the pyrolysis is completed, the temperature is cooled to room temperature to obtain a pyrolytic carbon material;

[0045] Step 4, washing and drying, washing the pyrolytic carbon material with deionized water to neutrality, drying at 80 degrees Celsius f...

Embodiment 2

[0055] A preparation method of a high-performance fluorinated peanut shell hard carbon electrode material, comprising the following steps:

[0056] Step 1, crushing the peanut shells, crushing the peanut shells to less than 5 mm, soaking the crushed peanut shells in deionized water for 3 hours to remove part of the water-soluble impurities;

[0057] Step 2, activation, soak the peanut shells obtained in step 1 in a 7wt% KOH solution for 3 hours and then place them in a 70°C oven to dry for 3 hours. The amount of the KOH solution is 4% of the mass of the peanut shells. times;

[0058] Step 3, pyrolysis, the peanut shell obtained in step 2 is pyrolyzed at 700 degrees Celsius under the protection of argon for 6 hours, the heating rate is 10 degrees Celsius / minute, and after the pyrolysis is completed, the temperature is cooled to room temperature to obtain a pyrolytic carbon material;

[0059] Step 4, washing and drying with water, washing the pyrolytic carbon material with deio...

Embodiment 3

[0064] A preparation method of a high-performance fluorinated peanut shell hard carbon electrode material, comprising the following steps:

[0065] Step 1, crushing the peanut shells, crushing the peanut shells to less than 2 mm, soaking the crushed peanut shells in deionized water for 3 hours to remove part of the water-soluble impurities;

[0066] Step 2, activation, soak the peanut shells obtained in step 1 in a 7wt% KOH solution for 3 hours and then place them in an oven at 80° C. for 3 hours. The amount of the KOH solution is 2% of the mass of the peanut shells times;

[0067] Step 3, pyrolysis, the peanut shell obtained in step 2 is pyrolyzed at 750 degrees Celsius for 6 hours under the protection of an inert gas, the heating rate is 8 degrees Celsius / minute, and after the pyrolysis is completed, cool down to room temperature to obtain a pyrolytic carbon material;

[0068] Step 4, washing and drying with water, washing the pyrolytic carbon material with deionized water ...

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Abstract

The invention discloses a preparation method of a high-performance fluorinated peanut shell hard carbon electrode material. The method comprises the following steps of pulverizing peanut shells, and cleaning the peanut shells with deionized water once to remove the water-soluble impurities; soaking the peanut shells in a KOH solution, activating, drying, carrying out high-temperature pyrolysis for4-6 hours under the protection of inert gas, and after the pyrolysis is finished, cooling to room temperature so as to obtain a pyrolytic carbon material; washing the pyrolytic carbon material to beneutral, drying, grinding the pyrolytic carbon material into powder, fluorinating the pyrolytic carbon material obtained in the step 4 by adopting a gas-phase fluorination method, wherein the fluorination gas is mixed gas of fluorine gas and nitrogen gas; keeping the fluorination temperature at 200-300 DEG C for 3-5 hours, and cooling to obtain a carbon fluoride material; uniformly mixing the carbon fluoride material with carbon black and a binder in proportion, uniformly coating an aluminum foil with an NMP, and drying to obtain the high-performance fluorinated peanut shell hard carbon electrode material. The high-energy-density carbon fluoride material can be obtained and used for a lithium primary battery, and the specific capacity of a battery can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of carbon composite materials, and in particular relates to a preparation method of a high-performance fluorinated peanut shell hard carbon electrode material. Background technique [0002] In recent years, due to the global demand for clean and sustainable energy, energy storage technologies for electric vehicles, rechargeable batteries for portable electronics, and large electrical energy storage have attracted much attention. Rechargeable lithium-ion batteries (LIBs) dominate in the following areas. Portable electronic devices are considered to be the preferred candidates for the energy supply of electric vehicles. However, LIBs are not suitable for large-scale electrical energy storage due to limited mineral reserves and high cost of Li-based compounds. To address this issue, rechargeable sodium-ion batteries (NIBs) have recently attracted researchers' attention due to the low-cost, abundant sodium res...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525C01B32/10
CPCC01B32/10H01M4/5835H01M10/0525Y02E60/10
Inventor 封伟李瑀周日新
Owner TIANJIN UNIV
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