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Method for synthesizing porous carbon micro-sphere based on phase separation

A porous carbon, phase separation technology, applied in the preparation/purification of carbon, carbides, tungsten/molybdenum carbides, etc., can solve the problems of poor high current discharge capacity, limit specific capacity, etc., and achieve high charge-discharge ratio. The effect of capacity, uniform pore distribution, and good cycle stability

Pending Publication Date: 2018-12-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking the application in the battery field as an example, the existing battery anode materials are mainly natural graphite and artificial graphite, but due to the constraints of its own structural characteristics, the development of graphite anode materials has encountered bottlenecks, such as specific capacity reaching the limit, continuous high current discharge capacity Poor

Method used

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  • Method for synthesizing porous carbon micro-sphere based on phase separation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: 10g of AMM (ammonium molybdate) and 4.5g of PVA (polyvinyl alcohol) were respectively dissolved in 500ml of deionized water, and then uniformly stirred in a 60°C water bath for 10h to form a uniform and transparent mixed solution. The solution is spray-dried to obtain the precursor, and the speed is 1200ml h -1 , The inlet temperature is 220℃, and the outlet temperature is 100℃. The collected precursor was vacuum dried at 80℃ for 12h, then in argon atmosphere for 1℃min -1 The rate of heating to 900 ℃ and keeping for 2h to get Mo2C@C red blood cell-like carbon spheres.

Embodiment 2

[0013] Example 2: 10g of AMM (ammonium molybdate) and 4.5g of PVA (polyvinyl alcohol) were dissolved in 500ml of deionized water, and then uniformly stirred in a 60°C water bath for 10 hours to form a uniform and transparent mixed solution. The solution is spray-dried to obtain the precursor, and the speed is 1200ml h -1 , The inlet temperature is 220℃, and the outlet temperature is 100℃. The collected precursor was vacuum dried at 80℃ for 12h, then in argon atmosphere for 1℃min -1 The rate of heating to 900 ℃ and keeping for 2h to get Mo2C@C red blood cell-like carbon spheres. 0.1g erythrocyte-like Mo2C@C was added to 65ml 1% HNO3 solution, and then heated at 80°C for 20h. Subsequently, the sample was centrifuged several times and vacuum dried at 80°C for 12 hours, and then heat-treated at 500°C for 2 hours to obtain porous erythrocyte-like carbon balls.

Embodiment 3

[0014] Example 3: 10 g of AMM (ammonium molybdate) and 4.5 g of PVA (polyvinyl alcohol) were dissolved in 500 ml of deionized water, and then uniformly stirred in a 60° C. water bath for 10 hours to form a uniform and transparent mixed solution. The solution is spray-dried to obtain the precursor, and the speed is 1200ml h -1 , The inlet temperature is 220℃, and the outlet temperature is 100℃. The collected precursor was vacuum dried at 80℃ for 12h, then in argon atmosphere for 1℃min -1 The rate of heating to 900 ℃ and keeping for 2h to get Mo2C@C red blood cell-like carbon spheres. 0.1g of erythrocyte-like Mo2C@C was added to 65ml of 3% HNO3 solution, and then heated at 80°C for 20h. Subsequently, the sample was centrifuged several times and vacuum dried at 80°C for 12 hours, and then heat-treated at 500°C for 2 hours to obtain porous erythrocyte-like carbon balls.

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Abstract

The invention discloses a method for synthesizing a porous carbon micro-sphere material based on a phase separation principle. Solution formed by mixing ammonium molybdate, polyvinyl alcohol and deionized water with a certain weight ratio is spray-dried to obtain a precursor, the precursor is dried in vacuum and annealed to obtain black powder, the powder is treated in hot dilute nitric acid, andheat treatment is performed after centrifugation and vacuum drying to obtain the porous carbon micro-sphere material. The preparation method is simple and high in yield. The prepared material has excellent porosity and large specific surface area, can be used for the fields of batteries, super-capacitors, gas sensors and the like, and has a wide industrial application prospect. A potassium ion battery is taken as an example, the prepared porous carbon micro-sphere material serves as a negative electrode of the battery, and high potassium storage capacity and excellent rate performance and cycling stability are displayed.

Description

【Technical Field】 [0001] The invention belongs to the field of carbon material preparation methods, and specifically relates to a porous carbon microsphere material based on the principle of phase separation and a preparation method thereof. 【Background technique】 [0002] Because of its wide range of sources, low price, and good thermal stability, carbon materials have attracted great attention in the fields of energy storage such as batteries and supercapacitors, as well as in the fields of gas sensors and conductive materials, and are currently the most widely used materials for commercialization. . Taking the application in the battery field as an example, the current battery anode materials are mainly natural graphite and artificial graphite, but due to the constraints of its own structural characteristics, the development of graphite anode materials has encountered bottlenecks, such as the specific capacity reaching the limit and the continuous high current discharge capabi...

Claims

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Application Information

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IPC IPC(8): C01B32/949C01B32/05H01M4/62
CPCH01M4/625C01B32/05C01B32/949C01P2004/03C01P2002/82C01P2006/40C01P2004/80C01P2006/16Y02E60/10
Inventor 张明蒋鹏杰黄曌
Owner HUNAN UNIV
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