Biomass-based sodium ion battery hard carbon anode material, and preparation method and application thereof

A sodium-ion battery, biomass material technology, applied in active material electrodes, battery electrodes, carbon preparation/purification, etc., can solve the problems of low specific capacity, difficult to effectively store sodium, etc., achieve excellent electrochemical performance, raw materials low cost effect

Pending Publication Date: 2020-01-21
LIAONING STARRY SKY SODIUM BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional graphite-based anode materials widely used in lithium-ion batteries are difficult to store sodium effectively because the interlayer distance is smaller than the diameter of sodium ions. Previous studies have shown that graphite-based materials can only store sodium in accordance with NaC 64 The form of sodium storage can only show a very low specific capacity

Method used

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  • Biomass-based sodium ion battery hard carbon anode material, and preparation method and application thereof
  • Biomass-based sodium ion battery hard carbon anode material, and preparation method and application thereof
  • Biomass-based sodium ion battery hard carbon anode material, and preparation method and application thereof

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Embodiment 1

[0057] This embodiment is used to illustrate the preparation method of a kind of biomass-based sodium ion battery hard carbon negative electrode material of the present invention, comprises the following steps:

[0058] 1) 1000 g of corn stalks were used as raw materials, washed three times with deionized water, and then dried in a muffle furnace at 100° C. for 5 hours.

[0059] 2) The corn stover obtained in step 1) was heated at 800° C. for 4 hours in an oxygen-deficient atmosphere to obtain a preliminary pyrolyzed carbon precursor.

[0060] 3) The carbon precursor obtained in step 2) is pulverized with a ball mill until D50 reaches 10 microns, and the particle size distribution is narrow.

[0061] 4) The pulverized carbon precursor was immersed in 1 L, 0.1 mol / L lithium permanganate solution and stirred for 1 hour, and then the carbon precursor was taken out.

[0062] 5) The treated carbon precursor is dried at 110° C. for 5 hours and passed through a 160-mesh sieve.

[0...

Embodiment 2

[0070] This embodiment is used to illustrate the preparation method of a kind of biomass-based sodium ion battery hard carbon negative electrode material of the present invention, comprises the following steps:

[0071] 1) Take 200 g of pumpkin vines as a raw material, wash with dedistilled water three times, and dry at 130° C. for 5 hours in a blast oven.

[0072] 2) The pumpkin vine obtained in step 1) was heated at 600° C. for 10 hours under an argon atmosphere to obtain a preliminary pyrolyzed carbon precursor.

[0073] 3) The carbon precursor obtained in step 2) is pulverized with a jet mill until the D50 reaches 20 microns, and the particle size distribution is narrow.

[0074] 4) The pulverized carbon precursor was immersed in 500 mL, 1 mol / L sodium permanganate solution and stirred for 1 hour, and then the carbon precursor was taken out.

[0075] 5) Dry the treated carbon precursor at 200° C. for 5 hours and pass through a 300-mesh sieve.

[0076] 6) The material was...

Embodiment 3

[0082] This embodiment is used to illustrate the preparation method of a kind of biomass-based sodium ion battery hard carbon negative electrode material of the present invention, comprises the following steps:

[0083] 1) 1000 g of rice straw was used as a raw material, washed three times with dedistilled water, and then dried in a tube furnace at 201° C. for 48 hours.

[0084] 2) Heating the straw obtained in step 1) at 300° C. for 24 hours under a helium atmosphere to obtain a preliminary pyrolyzed carbon precursor.

[0085] 3) The carbon precursor obtained in step 2) is crushed with a jaw crusher until the D50 reaches 50 microns, and the particle size distribution is narrow.

[0086] 4) The pulverized carbon precursor was immersed in 2L, 0.5 mol / L potassium permanganate solution and stirred for 1 hour, and then the carbon precursor was taken out.

[0087] 5) Dry the treated carbon precursor at 200° C. for 5 hours and pass through a 300-mesh sieve.

[0088] 6) The materia...

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Abstract

The invention provides a biomass-based sodium ion battery hard carbon anode material, and a preparation method and application thereof. The method includes the following steps: washing and drying thebiomass material, heating in an oxygen-free atmosphere at 100-800 DEG C for 1 to 24 hours to obtain carbon precursors, pulverizing the carbon precursors and impregnating the carbon precursors in a permanganate solution with carbon to oxidize the carbon material, thereby generating more sodium storage sites; drying and sieving the treated carbon precursor, then performing secondary sintering treatment, and then under an inert atmosphere at 800-2500, performing heat insulation treatment at a temperature of 0.5 to 48 hours, and then washing the product with an acid solution, and water-washing theproduct to pH = 7, and drying the product to obtain a final product. The method has simple and easy operation process and low price. The anode material has high energy density and good rate performance. The hard carbon negative electrode material of the sodium ion battery obtained according to this method is an excellent anode material of a sodium ion battery.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, and more specifically relates to a biomass-based hard carbon negative electrode material for sodium ion batteries, a preparation method and application thereof. Background technique [0002] In recent decades, the rapid development of lithium-ion batteries has made them the most important energy storage devices in daily life. With the widespread application of electric vehicles and smart electronic devices, the demand for lithium will increase greatly. However, the reserves of lithium are limited and the distribution of resources is uneven, which pushes up the price of lithium-related materials and increases the cost of batteries. Therefore, it is an urgent task to develop non-lithium-based electrochemical energy storage devices with excellent performance and low cost. Similar to the working principle of lithium-ion batteries, sodium-ion batteries, which are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M10/054H01M2004/027Y02E60/10
Inventor 侴术雷张睿琦李春生李用成曹余良戴树森李东祥李亚书
Owner LIAONING STARRY SKY SODIUM BATTERY CO LTD
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