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Preparation method and application of biomass hard carbon for sodium ion battery negative electrode material

A sodium-ion battery and negative electrode material technology, applied in the preparation/purification of carbon, battery electrodes, electrolyte storage battery manufacturing, etc., can solve the problem of low specific capacity

Inactive Publication Date: 2020-10-30
THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of biomass hard carbon for the negative electrode of sodium ion battery, aiming to solve the problem that the biomass hard carbon material in the prior art contains a short-range ordered graphite structure and less microporous structure, below 0.1V The problem of lower specific capacity, in order to achieve the above-mentioned purpose of the invention, the technical scheme adopted in the present invention is as follows:

Method used

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  • Preparation method and application of biomass hard carbon for sodium ion battery negative electrode material
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  • Preparation method and application of biomass hard carbon for sodium ion battery negative electrode material

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preparation example Construction

[0033] Example of the present invention provides a kind of preparation method of biomass hard carbon for sodium ion battery negative electrode material, comprises the steps:

[0034] S01. Provide the raw material longan shell, soak in hot water and acidic solution, and dry to obtain the precursor;

[0035] S02. Introduce a protective gas, preheat the precursor, and grind it after cooling to obtain an intermediate product;

[0036] S03. Carry out carbonization treatment on the intermediate product, and obtain biomass hard carbon after cooling.

[0037] Specifically, longan shells are provided as raw materials, and longan shells are selected as raw materials, mainly because the composition of longan shells is different from other biomass. The main components of longan shells are 45.5% cellulose, 2.1% hemicellulose and 18.7% lignin. The hard carbon obtained from "longan shell" is used as the negative electrode material for sodium ions. Due to its special material structure, the ...

Embodiment 1

[0071] A kind of preparation method of biomass hard carbon for sodium ion battery negative electrode material

[0072] Wash the longan skin three times with clear water, and immerse it in 100° C. deionized water for 1 hour. After taking it out, soak the longan skin in 1mol / L hydrochloric acid for 24 hours. Soak in deionized water several times until neutral. The soaked longan skin is dried at 120° C. for 12 hours and then pulverized to obtain a precursor. Take 4.0g of the precursor and carry out low-temperature pretreatment in a tube furnace with argon (50sccm), raise the temperature to 450°C at a heating rate of 5°C / min, keep it warm for 1 hour, and grind it evenly after natural cooling to obtain an intermediate product. Weigh 1.0g of the intermediate product, lay it flat in a corundum crucible, put it into an argon-protected tube furnace for calcination, first raise the temperature to 450°C, keep it warm for 0.5 hours, then raise the temperature to 1350°C, keep it warm for...

Embodiment 2

[0076] A kind of preparation method of biomass hard carbon for sodium ion battery negative electrode material

[0077] Wash the longan skin three times with clear water, and immerse it in 100° C. deionized water for 1 hour. After taking it out, soak the longan skin in 1mol / L hydrochloric acid for 24 hours. Soak in deionized water several times until neutral. The soaked longan skin is dried at 120° C. for 12 hours and then pulverized to obtain a precursor. Take 4.0g of the precursor and carry out low-temperature pretreatment in a tube furnace with argon (50sccm), raise the temperature to 450°C at a heating rate of 5°C / min, keep it warm for 1 hour, and grind it evenly after natural cooling to obtain an intermediate product. Weigh 1.0g of the intermediate product, lay it flat in a corundum crucible, put it into an argon-protected tube furnace for calcination, first raise the temperature to 450°C, keep it warm for 0.5 hours, then raise the temperature to 1200°C, keep it warm for...

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Abstract

The invention provides a preparation method of biomass hard carbon for a sodium ion battery negative electrode material. The preparation method comprises the following steps: providing a raw materiallongan shell, soaking in hot water and an acidic solution, and drying to obtain a precursor; introducing a protective gas, preheating the precursor, cooling, and grinding to obtain an intermediate product; and carbonizing the intermediate product, and cooling to obtain the biomass hard carbon. The biological waste dragon's eye is used as the raw material so that the method is environment-friendlyand low in cost; carbonization treatment is adopted so that the obtained biomass hard carbon forms a partially graphitized carbon structure, sodium ion storage is facilitated, the specific capacity isimproved, excellent low-temperature performance is achieved, and meanwhile, the preparation method of the biomass hard carbon for the negative electrode material of the sodium-ion battery is simple and convenient.

Description

technical field [0001] The invention relates to the field of sodium ion energy storage materials, in particular to a preparation method and application of biomass hard carbon for sodium ion battery negative electrode materials. Background technique [0002] Lithium-ion batteries are currently widely used in portable electronic devices. However, with the growing market demand for lithium-ion batteries in electric vehicles and renewable energy power storage systems, the depletion of lithium-ion resources and the increase in cost will hinder the development of lithium-ion batteries. Continuous development and application in large-scale equipment. Therefore, the development of affordable energy storage technologies that can replace lithium-ion batteries has become an international research hotspot. In recent years, because of the similar structure and properties of sodium to lithium, as well as the abundant reserves and wide distribution of sodium in the earth's crust (26000ppm...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/1393H01M4/587H01M10/054H01M10/058
CPCC01B32/05H01M4/1393H01M4/587H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 张标林秀仪黄加强谭鸿
Owner THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST
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