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Hard carbon material for anode of sodium-ion battery, preparation method of hard carbon material and related sodium-ion battery

A technology of sodium ion battery and negative electrode material, applied in the fields of energy storage materials and electrochemistry, can solve the problems of poor performance and high cost, and achieve the effects of less difficulty in industrialization, high specific capacity and excellent electrochemical performance

Inactive Publication Date: 2019-04-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high cost and poor performance in the preparation of hard carbon materials in the prior art, the present invention provides a hard carbon material for the negative electrode of sodium ion batteries and its preparation method and related sodium ion batteries

Method used

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  • Hard carbon material for anode of sodium-ion battery, preparation method of hard carbon material and related sodium-ion battery
  • Hard carbon material for anode of sodium-ion battery, preparation method of hard carbon material and related sodium-ion battery
  • Hard carbon material for anode of sodium-ion battery, preparation method of hard carbon material and related sodium-ion battery

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Embodiment 1

[0038]Step 1: Take 10g of rape stalks, put them into 1mol / L potassium hydroxide solution, stir and wash for 1 hour, filter and separate, then put them into 1mol / L hydrochloric acid solution, stir and wash for 1 hour, filter and separate, put them in an oven, Dry at 80°C for 12 hours to remove moisture;

[0039] Step 2: Put the dried sample in step 1 into a tube furnace, raise the temperature to 400°C at a rate of 5°C / min in an inert gas atmosphere, and keep it warm for 1 hour. After completion, naturally cool to room temperature with the furnace and take it out;

[0040] Step 3: Put the sample treated in step 2 into a tube furnace, raise the temperature from room temperature to 1000°C at a rate of 5°C / min under an inert gas atmosphere, and keep it warm for 2 hours. After the pyrolysis reaction is completed, cool it with the furnace to room temperature, take out;

[0041] Step 4: The sample taken out in step 3 was stirred and washed in 1 mol / L hydrochloric acid solution for 1 ...

Embodiment 2

[0044] Step 1: Take 10g of rape stalks, put them into 1mol / L sodium hydroxide solution, stir and wash for 1 hour, filter and separate, then put them into 1mol / L hydrochloric acid solution, stir and wash for 1 hour, filter and separate, put them in an oven, Dry at 80°C for 8 hours to remove moisture;

[0045] Step 2: Put the dried sample in step 1 into a tube furnace, raise the temperature to 400°C at a rate of 5°C / min in an inert gas atmosphere, and keep it warm for 1 hour. After completion, naturally cool to room temperature with the furnace and take it out;

[0046] Step 3: Put the sample treated in step 2 into a tube furnace, raise the temperature from room temperature to 1200°C at a rate of 5°C / min under an inert gas atmosphere, and keep it warm for 2 hours. After the pyrolysis reaction is completed, cool down with the furnace to room temperature, take out;

[0047] Step 4: The sample taken out in step 3 was stirred and washed in 1 mol / L hydrochloric acid solution for 1 h...

Embodiment 3

[0054] Step 1: Take 10g of rape stalks, put them into 2mol / L sodium hydroxide solution, stir and wash for 1 hour, filter and separate, then put them into 1mol / L hydrochloric acid solution, stir and wash for 1 hour, filter and separate, put them in an oven, Dry at 80°C for 8 hours to remove moisture;

[0055] Step 2: Put the dried sample in step 1 into a tube furnace, raise the temperature to 400°C at a rate of 5°C / min in an inert gas atmosphere, and keep it warm for 2 hours. After completion, naturally cool to room temperature with the furnace and take it out;

[0056] Step 3: Put the sample treated in step 2 into a tube furnace, raise the temperature from room temperature to 1400°C at a rate of 5°C / min under an inert gas atmosphere, and keep it warm for 3 hours. After the pyrolysis reaction is completed, cool down with the furnace to room temperature, take out;

[0057] Step 4: The sample taken out in step 3 was stirred and washed in 1 mol / L hydrochloric acid solution for 1 ...

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Abstract

The invention provides a hard carbon material for an anode of a sodium-ion battery, a preparation method of the hard carbon material and the related sodium-ion battery, and belongs to the technical field of energy storage materials and electrochemistry. The hard carbon material is synthesized from a biomass material as a precursor, compared with the traditional high-temperature carbonization process, the preparation method adopts process steps of alkaline washing, acid pickling, drying, pre-carbonization and pyrolysis, and the hard carbon material having larger interlayer spacing (not smallerthan 0.37 nm), smaller specific surface area (about 100 cm<3> / g) and rich micropores and mesopores is prepared by adjusting process parameters. By means of a special microstructure, the hard carbon material serving as the anode of the sodium-ion battery shows excellent electrochemical performance, high specific capacity, high coulombic efficiency and good cyclic stability. A novel concept is provided for preparing a sodium-ion anode material, and the preparation method is simple and has low preparation cost, high repeatability and small industrialization difficulty, and the hard carbon material is expected to be applied to sodium-ion batteries for realizing large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials and electrochemistry, and specifically relates to a hard carbon material used for a negative electrode of a sodium ion battery, a preparation method thereof, and a related sodium ion battery. Background technique [0002] After nearly 30 years of development, lithium-ion batteries have basically matured. They are mainly used in portable small appliances, and gradually develop into electric vehicles and large-scale grid energy storage systems under the call of national policies and the promotion of energy issues. However, the lack of lithium resources, uneven distribution and other issues limit this development. In the 1970s and 1980s, the research on sodium-ion batteries and lithium-ion batteries was almost at the same level. The commercialization process of lithium-ion batteries made the research and development of sodium-ion batteries relatively sluggish. The content of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M10/054Y02E60/10
Inventor 徐自强吴孟强陈金琛马云飞李湜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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