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Preparation method of biomass derivative carbon material used for sodium-ion batteries

A sodium-ion battery and biomass technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problem of low specific capacity, achieve high capacity retention, facilitate infiltration, and expand the specific surface area.

Inactive Publication Date: 2019-11-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the radius of sodium ions is larger than that of lithium ions, so they cannot be easily embedded in the graphite layer, resulting in a low specific capacity.

Method used

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  • Preparation method of biomass derivative carbon material used for sodium-ion batteries
  • Preparation method of biomass derivative carbon material used for sodium-ion batteries
  • Preparation method of biomass derivative carbon material used for sodium-ion batteries

Examples

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Embodiment 1

[0036] Weigh 10g of dried soybeans and place them in a grinder for 1h to make them into powder, then soak them in 50mL of 5% HCl solution for 1h to remove metal ions and other impurities, and then wash the powder materials with deionized water until neutral;

[0037] Add 50mL of 10mol·L to the obtained material -1 Soak in KOH solution and stir continuously, soak for 12 hours and then stand for 1 hour, pour off the supernatant, leave the precipitated part, collect the required materials by centrifugation, and dry in a drying oven at 100 °C for 12 hours;

[0038] The obtained material was carbonized under a tube furnace with an argon atmosphere at a heating rate of 5 °C min -1 , the calcination temperature is 700°C, the calcination time is 2h, and after the calcination is completed, it is naturally cooled to room temperature;

[0039] The calcined material was washed with 5% HCl solution and deionized water until the solution became neutral. Finally, it is centrifuged and drie...

Embodiment 2

[0044] Weigh 10g of dry soybeans and place them in a grinder for 1h to make them into powder, then soak them in 50mL of 5% HCl solution for 1h to remove metal ions and other impurities, then wash the powder materials with deionized water until neutral; Add 50mL 10mol·L to the material -1 Soak in KOH solution and stir continuously, soak for 12h and then stand for 1h, pour off the supernatant, leave the precipitated part, collect the required material by centrifugation, dry in a drying oven at 100°C for 12h; place the obtained material in argon gas Carbonization was carried out in a tube furnace with a heating rate of 5 °C min -1 , the calcination temperature is 800° C., and the calcination time is 2 hours. After the calcination is completed, it is naturally cooled to room temperature; the calcined material is cleaned with 5% HCl solution and deionized water until the solution becomes neutral. Finally, it is centrifuged and dried in an oven to obtain a biomass-derived carbon ma...

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Abstract

The invention belongs to the field of electrochemistry and energy material, and discloses a preparation method of a biomass derivative carbon material used for sodium-ion batteries. According to the preparation method, soybean is taken as a biomass source, KOH is taken as an activator, high temperature calcining is carried out so as to obtain the porous biomass derivative carbon material. Soybeanis a natural product, is abundant in sources, is high in protein content, contains a large amount of nitrogen element, and is capable of forming a natural nitrogen doped carbon material; the nitrogendoped carbon material can be used for providing Na<+> with sufficient sodium embedding vacancies, providing substantial fake capacitance in sodium-ion battery charging and discharging process, and increasing battery specific capacity; and in addition, nitrogen element doping is capable of improving material conductivity, and increasing iron transmission efficiency; KOH activation is capable of increasing porous structure specific surface area further, it is beneficial for electrolyte infiltration, and increasing of ion and electron transmission efficiency. The biomass derivative carbon material possesses the above advantages, so that when the biomass derivative carbon material is taken as a sodium ion anode material, relatively high reversible specific capacity and excellent circulation stability are achieved.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, and discloses a preparation method for a biomass-derived carbon material used in a sodium ion battery. Background technique [0002] Traditional fossil fuels (coal, oil, natural gas, etc.) are being exhausted day by day, and environmental pollution problems such as the greenhouse effect and acid rain caused by their combustion have seriously affected people's living standards. The country is vigorously developing new energy sources (solar energy, wind energy, geothermal energy, etc.) to solve these energy crises. However, the application of these new energy sources is often limited by natural conditions, which are random, intermittent, fluctuating, and cannot provide continuous and stable power. Therefore, how to store energy efficiently and conveniently has become the key. As we all know, graphite has become a commercial lithium-ion battery anode material because of its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01M4/62
CPCC01B32/318C01B32/348H01M4/625Y02E60/10
Inventor 邱静霞丁华瑞祁莹王广
Owner JIANGSU UNIV
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