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Sulfur-doped biomass hard carbon material as well as preparation method and application thereof

A biomass raw material and biomass technology, which is applied in the preparation/purification of carbon, electrochemical generators, electrical components, etc., can solve the problems of low carbon production rate, increased cost of precursor materials, etc. The effect of increasing surface active sites and increasing carbon layer spacing

Pending Publication Date: 2022-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precursors for preparing hard carbon are generally artificially synthesized resins, which leads to an increase in the cost of precursor materials, and the carbon production rate is very low, making it difficult to highlight its advantages in the huge competition. Therefore, how to reduce the price of hard carbon is to achieve Key to its application in low-cost sodium-ion batteries

Method used

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  • Sulfur-doped biomass hard carbon material as well as preparation method and application thereof
  • Sulfur-doped biomass hard carbon material as well as preparation method and application thereof
  • Sulfur-doped biomass hard carbon material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A sulfur-doped biomass hard carbon material, the preparation of which comprises the following steps:

[0045] S1. Pretreatment of precursors: chop fresh camphor branches into small pieces, and remove the camphor bark to obtain the main part, then put it into water and ultrasonic (100W), wash away the obvious impurities, and then put it in an oven , vacuum drying at 100°C for 12 hours to obtain the dried precursor;

[0046] S2. Precursor pulverization: put the dried precursor in step S1 into a pulverizer to pulverize (rotating speed is 5000r / min, time is 3min), and screen out camphor branch powder with a particle size of ≤400 mesh;

[0047] S3, raw material ball milling: get the camphor branch powder in 2g step S2, mix with 20g inorganic salt (KCl / LiCl=55 / 45) and 2g sulfur powder and put into the ball mill jar, then ball mill on the ball mill for 12h, the ball mill speed is set to 500r / min;

[0048] S4 Calcination: Put the ball-milled sample in step S3 into a porcelain b...

Embodiment 2

[0055] A sulfur-doped biomass hard carbon material, the preparation of which comprises the following steps:

[0056] S1. Pretreatment of precursors: chop fresh camphor branches into small pieces, and remove the camphor bark to obtain the main part, then put it into water and ultrasonic (100W), wash away the obvious impurities, and then put it in an oven , vacuum drying at 100°C for 12 hours to obtain the dried precursor;

[0057] S2. Precursor pulverization: put the dried precursor in step S1 into a pulverizer to pulverize (rotating speed is 5000r / min, time is 3min), and screen out camphor branch powder with a particle size of ≤400 mesh;

[0058] S3, raw material ball milling: get 2g camphor tree branch powder in step S2, mix with 20g inorganic salt (KCl / LiCl=55 / 45) and 2g sulfur powder and put in the ball mill jar, then ball mill on the ball mill for 12h, the rotating speed is set to 500r / min;

[0059] S4. Calcination: put the ball-milled sample in step S3 into a porcelain...

Embodiment 3

[0066] A sulfur-doped biomass hard carbon material, the preparation of which comprises the following steps:

[0067] S1. Pretreatment of precursors: chop fresh camphor branches into small pieces, and remove the camphor bark to obtain the main part, then put it into water and ultrasonic (100W), wash away the obvious impurities, and then put it in an oven , vacuum drying at 100°C for 12 hours to obtain the dried precursor;

[0068] S2. Precursor pulverization: put the dried precursor in step S1 into a pulverizer to pulverize (rotating speed is 5000r / min, time is 3min), and screen out camphor branch powder with a particle size of ≤400 mesh;

[0069] S3, raw material ball milling: get 2g camphor tree branch powder in step S2, mix with 20g inorganic salt (KCl / LiCl=55 / 45) and 2g sulfur powder and put in the ball mill jar, then ball mill on the ball mill for 12h, the rotating speed is set to 500r / min;

[0070] S4 Calcination: Put the ball-milled sample in step S3 into a porcelain ...

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Abstract

The invention provides a sulfur-doped biomass hard carbon material and a preparation method and an application thereof. The preparation method comprises the following steps: pretreating and smashing biomass raw materials, and obtaining precursor powder; mixing and ball-milling the precursor powder, inorganic salt and a sulfur source, then heating to the melting point of the inorganic salt under a protective atmosphere, calcining, then heating to the carbonization temperature, calcining, and naturally cooling to obtain a calcined product; and soaking the calcined product in an acid solution, washing until the filtrate is neutral, and drying to obtain the product. The hard carbon material prepared by the preparation method is relatively large in interlayer spacing and rich in surface active sites, the sodium ion migration rate can be greatly increased, and the electrochemical performance is improved. In addition, the preparation method is simple in process, low in energy consumption and easy to operate.

Description

technical field [0001] The present invention relates to the field of preparation of biomass carbon materials, more specifically, to a sulfur-doped biomass hard carbon material and its preparation method and application. Background technique [0002] As an important next-generation energy storage device, sodium-ion batteries are attracting increasing attention. At present, the performance of its cathode material is equivalent to that of lithium-ion batteries, and the research on high-performance anode materials is a bottleneck problem restricting its application. In recent years, the research on the application of hard carbon materials in sodium-ion batteries as anode materials has gradually increased, and it is considered to be the anode material for sodium-ion batteries that is most likely to be commercialized. However, the precursors for preparing hard carbon are generally artificially synthesized resins, which leads to an increase in the cost of precursor materials, and ...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/133H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M4/133H01M10/054Y02E60/10
Inventor 纪效波肖诩桓邹国强侯红帅邹康宇蔡鹏
Owner CENT SOUTH UNIV