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A preparation method of biomass hard carbon material for negative electrode of sodium ion battery

A sodium-ion battery, biomass material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low capacity of hard carbon materials, difficult to meet the requirements of commercialization of sodium-ion batteries, etc. Beneficial to de-intercalation and adsorption, good industrialization prospects, and cost-reducing effects

Active Publication Date: 2018-12-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are reports of using peanut shells, straw and weeds as carbon sources to prepare biomass hard carbon, but the prepared hard carbon materials generally have low capacity, which is difficult to meet the requirements of commercialization of sodium-ion batteries.

Method used

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  • A preparation method of biomass hard carbon material for negative electrode of sodium ion battery
  • A preparation method of biomass hard carbon material for negative electrode of sodium ion battery
  • A preparation method of biomass hard carbon material for negative electrode of sodium ion battery

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Embodiment 1

[0029] A preparation method of biomass hard carbon material for sodium ion battery negative electrode, comprising the following steps:

[0030] 1) Wash the lotus pods with deionized water and dry them in a vacuum oven at 80°C for 24 hours;

[0031] 2) Under the argon atmosphere with a flow rate of 200 sccm, heat the material obtained in step 1) to 1000 °C at a rate of 5 °C / min in a tube furnace, keep it for 1 hour, and then increase the temperature at a rate of 2 °C / min to 1200°C, and keep warm for 1h;

[0032] 3) Grind the material obtained in step 2) into powder, stir in 1M hydrochloric acid solution for 12 hours, then wash with deionized water until neutral, and vacuum dry in a vacuum oven at 80°C for 12 hours to obtain sodium ions Biomass hard carbon material for battery negative electrode, marked as LS1200H.

[0033] figure 1 For the SEM image of the biomass hard carbon material prepared in this example, it can be seen that there are many micron-sized holes in the mate...

Embodiment 2

[0036] A preparation method of biomass hard carbon material for sodium ion battery negative electrode, comprising the following steps:

[0037] 1) Wash the lotus pods with deionized water and dry them in a vacuum oven at 80°C for 24 hours;

[0038] 2) Under an argon atmosphere with a flow rate of 200 sccm, heat the material obtained in step 1) to 1000°C at a rate of 5°C / min in a tube furnace, and keep it warm for 2h;

[0039] 3) Grind the material obtained in step 2) into powder, stir in 1M hydrochloric acid solution for 12 hours, then wash with deionized water until neutral, and vacuum dry in a vacuum oven at 80°C for 12 hours to obtain sodium ions Biomass hard carbon material for battery negative electrode, marked as LS1000H.

Embodiment 3

[0041] A preparation method of biomass hard carbon material for sodium ion battery negative electrode, comprising the following steps:

[0042] 1) Wash the lotus pods with deionized water and dry them in a vacuum oven at 80°C for 24 hours;

[0043] 2) Under an argon atmosphere with a flow rate of 200 sccm, heat the material obtained in step 1) to 1400°C at a rate of 5°C / min in a tube furnace, and keep it warm for 2h;

[0044] 3) Grind the material obtained in step 2) into powder, stir in 1M hydrochloric acid solution for 12 hours, then wash with deionized water until neutral, and vacuum dry in a vacuum oven at 80°C for 12 hours to obtain sodium ions The biomass hard carbon material used for the negative electrode of the battery is marked as LS1400H.

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Abstract

The invention discloses a preparation method of a biomass hard carbon material for a negative electrode of a sodium ion battery, which adopts cheap and easily available biomass as a carbon source to prepare a hard carbon material for the negative electrode of the sodium ion battery by a simple and convenient method, and can effectively reduce the cost of the sodium ion battery. At the same time, the hard carbon material has large carbon layer spacing and can accommodate sodium ion intercalation and desorption, and the prepared sodium ion battery has excellent electrochemical performance and good industrial prospect, and is very suitable for a large-scale energy storage system.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion secondary battery, in particular to a preparation method of a biomass hard carbon material for a negative electrode of a sodium ion battery. Background technique [0002] Due to the advantages of high energy density, long service life, high rated voltage, good rate performance, low self-discharge, and environmental protection, lithium-ion secondary batteries have been widely used in mobile devices and electric vehicles in recent years. However, lithium reserves on Earth are limited and unevenly distributed. Half of the world's lithium ore resources are distributed in the Americas, and my country's lithium ore resources are not rich. With the development of lithium-ion batteries, it will inevitably cause the price of lithium mines to rise, and it will also deplete lithium mines, which is not conducive to the requirements of sustainable development. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/054
CPCH01M4/36H01M4/625H01M10/054Y02E60/10
Inventor 白莹吴锋张明昊吴川王兆华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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