Preparation method and application of corn starch porous carbon@graphite

A technology of corn starch and porous carbon, which is applied in the field of nanomaterials and chemical power sources, can solve the problems of low capacity, poor compatibility of PC electrolyte, unsatisfactory rate performance, etc., and achieve simple and safe preparation process, good cycle life and rate performance Effect

Inactive Publication Date: 2017-11-17
河南新太行电源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a mature negative electrode material, graphite has the advantages of low price and excellent cycle performance; however, the disadvantages of graphite are also obvious: low capacity, poor compatibility with PC electrolyte, unsatisfactory rate performance, etc. Development requirements for high specific capacity and high rate performance of a new generation of lithium-ion batteries

Method used

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  • Preparation method and application of corn starch porous carbon@graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Preparation of cornstarch porous carbon

[0022] Weigh 4.523 g of disodium hydrogen phosphate and 0.774 g of citric acid to prepare a pH=4.5 buffer solution; stir 20 g of cornstarch and 40 mL of buffer solution in a water bath at 50°C for 10 min with magnetic force to obtain a starch suspension; Weighed 0.2 g of amylase and 20 mL of buffer solution, stirred evenly to prepare an enzyme liquid; slowly added the enzyme liquid into the starch suspension, and reacted for 12 h in a water bath at 50 °C with magnetic stirring. Suction filtration, washing, drying and grinding the porous starch. The porous starch was transferred to an oven and reacted at 180 °C for 24 h to obtain pre-oxidized porous starch; the pre-oxidized porous starch was placed in a tube furnace and calcined in a protective atmosphere at 900 °C for 3 h at a heating rate of 5°C / min, cooled to room temperature, and ground to obtain cornstarch porous carbon.

[0023] 2. Preparation of cornstarch porous carb...

Embodiment 2

[0026] 1. Preparation of cornstarch porous carbon

[0027] Weigh 4.523 g of disodium hydrogen phosphate and 0.774 g of citric acid to prepare a pH=4.5 buffer solution; stir 20 g of cornstarch and 40 mL of buffer solution in a water bath at 50°C for 10 min with magnetic force to obtain a starch suspension; Weighed 0.2 g of amylase and 20 mL of buffer solution, stirred evenly to prepare an enzyme liquid; slowly added the enzyme liquid into the starch suspension, and reacted for 12 h in a water bath at 50 °C with magnetic stirring. Suction filtration, washing, drying and grinding the porous starch. The porous starch was transferred to an oven and reacted at 150 °C for 8 h to obtain pre-oxidized porous starch; the pre-oxidized porous starch was placed in a tube furnace and calcined in a protective atmosphere at 800 °C for 2 h at a heating rate of 1°C / min, cooled to room temperature, and ground to obtain cornstarch porous carbon.

[0028] 2. Preparation of cornstarch porous carbo...

Embodiment 3

[0031] 1. Preparation of cornstarch porous carbon

[0032] Weigh 4.523 g of disodium hydrogen phosphate and 0.774 g of citric acid to prepare a pH=4.5 buffer solution; stir 20 g of cornstarch and 40 mL of buffer solution in a water bath at 50°C for 10 min with magnetic force to obtain a starch suspension; Weighed 0.2 g of amylase and 20 mL of buffer solution, stirred evenly to prepare an enzyme liquid; slowly added the enzyme liquid into the starch suspension, and reacted for 12 h in a water bath at 50 °C with magnetic stirring. Suction filtration, washing, drying and grinding the porous starch. The porous starch was transferred to an oven and reacted at 200 °C for 36 h to obtain pre-oxidized porous starch; the pre-oxidized porous starch was placed in a tube furnace and calcined in a protective atmosphere at 1000 °C for 6 h at a heating rate of 10°C / min, cooled to room temperature, and ground to obtain cornstarch porous carbon.

[0033] 2. Preparation of cornstarch porous ca...

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Abstract

The invention discloses a preparation method and application of corn starch porous carbon@graphite. The preparation method comprises the steps of firstly, weighing disodium hydrogen phosphate and citric acid to prepare a buffer solution, slowly adding the buffer solution and amylase to corn starch, performing water bath, performing enzymolysis under magnetic stirring, and cleaning and drying the solution; secondly, performing pre-oxidation; and finally, placing the pre-oxidized material in a muffle furnace for calcination, wherein the selected corn starch porous carbon is of a spherical structure, macropore structures and mesoporous structures are formed in a spherical surface by simple enzymolysis, pre-oxidization and carbonization technologies, the corn starch porous carbon prepared in the previous steps and a graphite material are accurately weighed and are placed in an agate ball milling tank according to a certain proportion, ball-milling and mixing are performed by an XQM planetary ball-milling machine, and drying and grinding are performed to obtain a target product. The preparation method has the advantages that the preparation process is simple and safe, and the prepared battery negative electrode has relatively long cycle lifetime and rate performance.

Description

technical field [0001] The invention relates to a preparation method and application of cornstarch porous carbon@graphite, belonging to the technical field of nanomaterials and chemical power sources. Background technique [0002] In recent years, with the widespread application of lithium-ion batteries in electronic products, hybrid power, energy storage, etc., people have put forward higher requirements for the energy density and cycle life of lithium-ion batteries. At present, the research on lithium-ion batteries mainly focuses on the negative electrode, positive electrode materials and electrolytes. Among them, the negative electrode material is considered to be a key part of the development of high-performance lithium-ion batteries, which determines the capacity and cycle of lithium-ion batteries to a certain extent. performance and rate performance. At present, the negative electrode material used in lithium-ion batteries is mainly graphite. As a mature negative ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525C01B32/15B82Y30/00
CPCB82Y30/00C01P2006/40H01M4/364H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 刘静杰胡韶芳穆培振柴和平卞鸿彦李加勇杨忠祥段会杰位杰刘海英王义新武志言
Owner 河南新太行电源股份有限公司
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