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Positive electrode material for improving cycling stability of sulfurized polyacrylonitrile battery and preparation method of positive electrode material

A technology of polyacrylonitrile battery and vulcanized polyacrylonitrile, which is applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of low utilization rate of sulfur, achieve increased reaction kinetics, scientific and reasonable design, reduce The effect of the shuttle effect

Pending Publication Date: 2022-07-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above problems, the present invention provides a positive electrode material and a preparation method thereof for improving the cycle stability of a sulfurized polyacrylonitrile battery, thereby solving the problems of low utilization rate of sulfur in the positive electrode material in a sulfurized polyacrylonitrile battery

Method used

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  • Positive electrode material for improving cycling stability of sulfurized polyacrylonitrile battery and preparation method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of vulcanized polyacrylonitrile cathode material

[0036] Accurately weigh 5.0 g of elemental sulfur, 1.0 g of polyacrylonitrile, and 0.05 g of lithium iodide, and grind them by hand in an agate mortar for 15 minutes until there are no large polyacrylonitrile particles visible to the naked eye. The uniformly ground powder was dried in an oven at 60°C for 2 hours to remove excess water.

[0037] The operation was carried out in a glove box filled with argon gas, the above-mentioned powder was placed in a quartz tube and then placed in a reaction kettle, the reaction kettle was tightened, and the reaction kettle was placed in a tube furnace filled with argon gas for heating. The temperature range of the heating process was as follows: From room temperature to 400°C, the heating rate is 5°C / min, the temperature is kept at 400°C for 6 hours, and the temperature is naturally cooled to room temperature after the heat preservation process. After taking out the...

Embodiment 2

[0046] (1) Accurately weigh 3.0 g of elemental sulfur, 1.0 g of polyacrylonitrile, and 0.15 g of lithium iodide, and grind them by hand in an agate mortar for 20 minutes until there are no large polyacrylonitrile particles visible to the naked eye. The uniformly ground powder was dried in an oven at 60°C for 3 hours to remove excess water.

[0047] The operation was carried out in a glove box filled with argon gas, the above-mentioned powder was placed in a quartz tube and then placed in a reaction kettle, the reaction kettle was tightened, and the reaction kettle was placed in a tube furnace filled with argon gas for heating. The temperature range of the heating process was as follows: From room temperature to 400°C, the heating rate is 7°C / min, and the temperature is kept at 400°C for 7 hours, and the temperature is naturally cooled to room temperature after the heat preservation process. After taking out the black powder, continue grinding in an agate mortar for 15 minutes,...

Embodiment 3

[0055] Accurately weigh 4.0 g of elemental sulfur, 1.0 g of polyacrylonitrile, and 0.1 g of lithium iodide, and grind them by hand in an agate mortar for 30 minutes until there are no large polyacrylonitrile particles visible to the naked eye. The uniformly ground powder was dried in an oven at 60°C for 5 hours to remove excess water.

[0056] The operation was carried out in a glove box filled with argon gas, the above powder was placed in a quartz tube and then placed in a reaction kettle, the reaction kettle was tightened, and the reaction kettle was placed in a tube furnace filled with argon gas for heating. The temperature range of the heating process was as follows: From room temperature to 400°C, the heating rate is 10°C / min, the temperature is kept at 400°C for 8 hours, and the temperature is naturally cooled to room temperature after the heat preservation process. After taking out the black powder, continue grinding in an agate mortar for 15 minutes, place it in a dou...

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Abstract

The preparation method comprises the following steps: fully grinding and mixing raw materials, placing fully dried powder in a quartz tube with an opening in one side, placing the quartz tube in a reaction kettle, screwing the reaction kettle, placing the reaction kettle in a tubular furnace filled with argon, heating, and after the heat preservation process is finished, cooling to room temperature to obtain the positive electrode material for improving the cycling stability of the sulfurized polyacrylonitrile battery. And naturally cooling to room temperature. And taking out the black powder, continuously grinding, putting the ground powder into a double-opening quartz tube, continuously heating in a tubular furnace filled with argon, and naturally cooling to room temperature after the heat preservation process is finished, so as to obtain the black powder, namely the vulcanized polyacrylonitrile positive electrode material. The positive electrode material prepared by the invention solves the problem of high attenuation rate of a sulfurized polyacrylonitrile battery in the cycle process, and has excellent cycle stability.

Description

technical field [0001] The invention belongs to the field of energy materials, and particularly relates to a positive electrode material for improving the cycle stability of a vulcanized polyacrylonitrile battery and a preparation method thereof. Background technique [0002] Since the 21st century, the rapid development of science and technology has not only provided convenience for human life, but also led to the evolution of energy production methods and development models from the traditional exploitation of fossil energy to the vigorous development of wind energy, tidal energy and other new types of renewable energy with the help of natural forces, and then to the present. Nowadays, portable lithium-ion batteries are widely used in mobile phones and drones. [0003] The cathode materials of lithium-ion batteries in the market mostly use inorganic compounds containing Ni, Fe, and ternary materials containing Ni, Co, and Mn. Although they have been commercialized for a lo...

Claims

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Application Information

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IPC IPC(8): C08F8/34C08F8/48C08F120/44H01M4/60H01M10/052H01M4/62
CPCC08F8/34C08F8/48H01M10/052H01M4/602H01M4/624H01M2004/028C08F120/44Y02E60/10
Inventor 黄雅钦姬璇
Owner BEIJING UNIV OF CHEM TECH
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