Preparation method and application of corn starch porous carbon packaged core-shell structure silicon/carbon material

A technology of corn starch and core-shell structure, which is applied in the field of nanomaterials and chemical power sources, can solve problems such as shedding, powdering of active substances, and affecting the cycle life of materials, and achieve the effects of simple and safe preparation process, good cycle life and rate performance

Inactive Publication Date: 2017-12-29
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

However, during the process of lithium intercalation and delithiation, silicon is accompanied by a huge volume deformation (300%), which leads to the pulverization and shedding of active materials, resulting in an increase in irreversible capacity and affecting the cycle life of the material.

Method used

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  • Preparation method and application of corn starch porous carbon packaged core-shell structure silicon/carbon material
  • Preparation method and application of corn starch porous carbon packaged core-shell structure silicon/carbon material
  • Preparation method and application of corn starch porous carbon packaged core-shell structure silicon/carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of cornstarch porous carbon

[0031] 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.

[0032] 2. Preparation of core-shell silicon / car...

Embodiment 2

[0037] 1. Preparation of cornstarch porous carbon

[0038]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 5°C / min, cooled to room temperature, and ground to obtain cornstarch porous carbon.

[0039] 2. Preparation of core-shell silicon / carbo...

Embodiment 3

[0044] 1. Preparation of cornstarch porous carbon

[0045] 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 5°C / min, cooled to room temperature, and ground to obtain cornstarch porous carbon.

[0046] 2. Preparation of core-shell silicon / ca...

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Abstract

The invention discloses a preparation method and application of a corn starch porous carbon packaged core-shell structure silicon/carbon material. The preparation method comprises the following steps: firstly, preparing a buffering solution; adding the buffering solution and amylase into corn starch; carrying out enzymolysis in a water bath under a magnetic force; carrying out washing and drying treatment on the corn starch; then, carrying out pre-oxidization and putting a pre-oxidized material into a muffle furnace; carrying out calcination in a protective atmosphere to obtain a target product; taking nano silicon powder and glucose and carrying out magnetic stirring and ultrasonic dispersion; transferring suspension liquid into a high-pressure reaction kettle and carrying out hydrothermal reaction; after cooling the material to room temperature, carrying out water washing and drying; transferring the material into a tubular furnace and carrying out the calcination in the protective atmosphere; cooling and grinding to obtain a target product; weighing corn starch porous carbon and a core-shell structure silicon/carbon material and stirring and dispersing; then carrying out vacuumizing, water washing and drying to obtain a target product. When the material prepared by the preparation method is used as a negative electrode material of a lithium-ion battery, the material has relatively good cycle life and rate performance.

Description

technical field [0001] The invention relates to a preparation method and application of a core-shell structure silicon / carbon material encapsulated by cornstarch porous carbon and belongs to the technical field of nanometer materials and chemical power sources. Background technique [0002] In recent years, with the widespread application of lithium-ion batteries in radio communication devices, hybrid power equipment, static energy storage power supplies, electronic products, and national defense applications, people have put forward higher requirements for the energy density and cycle life of lithium-ion batteries. At present, the negative electrode material used in lithium-ion batteries is mainly graphite. 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. The de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583B82Y30/00
CPCB82Y30/00H01M4/386H01M4/583Y02E60/10
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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