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Preparation method of phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide/carbon lithium ion battery composite negative electrode material

A lithium-ion battery and amorphous carbon technology, applied in the field of new energy materials for lithium-ion batteries, can solve the problems of low molybdenum disulfide content, unstable structure, and easy agglomeration of products in the 1T phase, and achieve high energy density and electrochemical performance Improve and improve the effect of electron transmission

Pending Publication Date: 2022-05-27
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have problems such as low content of molybdenum disulfide in 1T phase, unstable structure, and easy agglomeration of products.

Method used

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  • Preparation method of phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide/carbon lithium ion battery composite negative electrode material
  • Preparation method of phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide/carbon lithium ion battery composite negative electrode material
  • Preparation method of phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide/carbon lithium ion battery composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Weigh 0.29 g of polyvinyl alcohol, ultrasonically disperse and dissolve it in 40 mL of deionized water, then add 0.14 g of potassium molybdate (concentration of 0.015 M) and 0.18 g of dithiourea (Mo:S = 1:4), and stir until it is Completely dissolved, the molar ratio of molybdenum source and carbon source is 1:11; the mixed solution was transferred to a 50 mL hydrothermal kettle, reacted at 210 ° C for 18 hours, cooled to room temperature, and then centrifuged alternately with deionized water and absolute ethanol Washed 3 times each, then transferred to a 60°C blast oven for drying for 12 hours, and ground to obtain a 1T phase molybdenum disulfide / carbon composite material. Weigh 0.05 g of glufosfamide, 0.1 g of polyvinyl alcohol (the mass ratio of phosphorus source to carbon source is 1:2) and 0.2 g of 1T phase molybdenum disulfide / carbon material (the mass ratio of carbon source to 1T phase molybdenum disulfide / carbon). 1:2) were added to 100 mL of deionized water for ...

Embodiment 2

[0039] Weigh 1.2 g of polyacrylic acid, ultrasonically disperse and dissolve it in 40 mL of deionized water, then add 1.9 g of potassium molybdate (concentration of 0.2 M) and 1.2 g of dithiourea (Mo:S = 1:2), and stir until it is completely Dissolve, the molar ratio of molybdenum source and carbon source is 1:2; transfer the mixed solution into a 50 mL hydrothermal kettle, react at 160 ° C for 36 hours, cool to room temperature, and then alternately centrifuge and wash with deionized water and absolute ethanol 3 times each, and then transferred to a 60° C. blast oven for drying for 12 hours, and then ground to obtain a 1T phase molybdenum disulfide / carbon composite material. Weigh 0.05 g of aluminum phosphoramide, 0.05 g of polyvinyl alcohol (the mass ratio of phosphorus source to carbon source is 1:1) and 0.2 g of 1T phase molybdenum disulfide / carbon material (the mass ratio of carbon source to 1T phase molybdenum disulfide / carbon). 1:4) were added to 100 mL of deionized wat...

Embodiment 3

[0042] Weigh 4.8 g of urea, ultrasonically disperse and dissolve it in 40 mL of deionized water, then add 0.86 g of manganese molybdate (concentration of 0.1 M) and 0.77 g of sulfur powder (Mo:S = 1:6), stir until it is completely dissolved, The molar ratio of molybdenum source and carbon source was 1:20; the mixed solution was transferred to a 50 mL hydrothermal kettle, reacted at 260 °C for 12 hours, cooled to room temperature, and then washed with deionized water and absolute ethanol by alternating centrifugation for 3 times each. time, and then transferred to a 60°C blast oven for drying for 12 hours, and then ground to obtain a 1T phase molybdenum disulfide / carbon composite material. Weigh 0.02 g of benfotiamine, 0.06 g of urea (the mass ratio of phosphorus source to carbon source is 1:3) and 0.2 g of 1T phase molybdenum disulfide / carbon material (the mass ratio of carbon source to 1T phase molybdenum disulfide / carbon is 1:3.3) were added to 100 mL of deionized water for ...

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Abstract

The invention discloses a preparation method of a phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide / carbon lithium ion battery composite negative electrode material, which comprises the following steps of: synthesizing a 1T-phase molybdenum disulfide / carbon composite material with high-purity and large-interlayer spacing 1T-phase molybdenum disulfide by adopting a hydrothermal method, and subsequently realizing uniform coating of phosphorus-doped amorphous carbon by adopting a pyrolysis method, so as to prepare the phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide / carbon lithium ion battery composite negative electrode material. And finally obtaining the phosphorus-doped amorphous carbon coated 1T-phase molybdenum disulfide / carbon lithium ion battery negative electrode material. The material has excellent electron transmission performance and structural stability, shows good cycle performance and rate capability, and can be widely applied to high-capacity, long-life and high-stability lithium ion batteries. The morphology and structure of the product are easy to regulate and control, the preparation method is simple, the period is short, conditions are easy to reach, large-scale production is facilitated, and the market prospect is wide.

Description

technical field [0001] The invention belongs to the field of new energy materials for lithium ion batteries, and in particular relates to a preparation method of a phosphorus-doped amorphous carbon-coated 1T phase molybdenum disulfide / carbon lithium ion battery composite negative electrode material. Background technique [0002] Today, traditional fossil energy is in short supply, and at the same time, the environmental problems caused by the use of fossil energy are becoming more and more serious, so human beings have to turn to research and development of sustainable and green new energy. However, many new energy sources are affected by the natural environment and cannot work continuously, such as solar energy, wind energy, and geothermal energy. Therefore, it is necessary to develop energy storage systems with high conversion efficiency and large energy storage capacity. Among them, lithium-ion batteries have the advantages of high open circuit voltage, high energy densi...

Claims

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Application Information

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IPC IPC(8): C01G39/06C01B32/05H01M4/58H01M4/62H01M10/0525
CPCC01G39/06C01B32/05H01M4/366H01M4/5815H01M4/625H01M10/0525C01P2006/80C01P2004/80C01P2006/40C01P2002/72C01P2004/03C01P2004/04C01P2002/82Y02E60/10
Inventor 朱文均石成飞汪梓铭蒋昆胡跃辉廖达海
Owner JINGDEZHEN CERAMIC INSTITUTE
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