Preparation method of large-layer-spacing graphite anode material of sodium-ion battery

A sodium-ion battery, graphite negative electrode technology, applied in battery electrodes, batteries, negative electrodes, etc., can solve the problems of less than 250mAh/g specific capacity, fast capacity decay, easy irreversibility, etc., to achieve increased sodium storage capacity and tap density. The effect of enlargement and simple preparation method

Active Publication Date: 2016-06-29
SHENZHEN XIANGFENGHUA TECH CO LTD +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The modified graphite negative electrode material obtained by this method has a carbon layer spacing of not less than 0.35nm and a capacity of up to 200mAh / g. However, due to insufficient reduction of graphite oxide, the irreversibility is high, the capacity decays quickly, and the capacity is not enough after 50 cycles. 90%, and it only uses simple coating to curb the reduction of graphite interlayer spacing during heat treatment, and the carbon interlayer spacing is still too small, resulting in a specific capacity of less than 250mAh / g

Method used

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  • Preparation method of large-layer-spacing graphite anode material of sodium-ion battery
  • Preparation method of large-layer-spacing graphite anode material of sodium-ion battery

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Embodiment 1

[0020] A method for preparing a large interlayer spacing graphite negative electrode material for a sodium ion battery, comprising the steps of:

[0021] (1) Dissolving an appropriate amount of carbon source in a solvent, then adding graphite oxide, stirring at a speed of 50 rpm until evenly mixed, then drying to obtain carbon source-coated graphite oxide;

[0022] The carbon source is coal tar pitch, the solvent is toluene, and the corresponding drying temperature is 200°C.

[0023] The feed ratio of described solvent and carbon source is 25mL:1g; The mass ratio of described carbon source and graphite oxide is 0.2:1;

[0024] (2) Put the carbon source-coated graphite oxide obtained in step 1 into a quartz glass beaker, add liquid nitrogen, the amount of liquid nitrogen is to submerge the carbon source-coated graphite oxide, and then quickly place the quartz glass beaker into the microwave reaction In the device, react under the microwave power of 1000W for 5 minutes, after t...

Embodiment 2

[0028] A method for preparing a large interlayer spacing graphite negative electrode material for a sodium ion battery, comprising the steps of:

[0029] (1) Dissolving an appropriate amount of carbon source in a solvent, then adding graphite oxide, stirring at a speed of 20 rpm until evenly mixed, and then drying to obtain carbon source-coated graphite oxide;

[0030] The carbon source is sucrose and glucose, the solvent is deionized water, and the corresponding drying temperature is 100°C.

[0031] The feed ratio of described solvent and carbon source is 5mL:1g; The mass ratio of described carbon source and graphite oxide is 0.01:1;

[0032] (2) Put the carbon source-coated graphite oxide obtained in step 1 into a quartz glass beaker, add liquid nitrogen, the amount of liquid nitrogen is to submerge the carbon source-coated graphite oxide, and then quickly place the quartz glass beaker into the microwave reaction In the device, react under the microwave power of 250W for 20...

Embodiment 3

[0036] A method for preparing a large interlayer spacing graphite negative electrode material for a sodium ion battery, comprising the steps of:

[0037] (1) Dissolving an appropriate amount of carbon source in a solvent, then adding graphite oxide, stirring at a speed of 30 rpm until evenly mixed, and then drying to obtain carbon source-coated graphite oxide;

[0038] The carbon source is coal tar pitch, the solvent is toluene, and the corresponding drying temperature is 100°C.

[0039] The feed ratio of described solvent and carbon source is 15mL:1g; The mass ratio of described carbon source and graphite oxide is 0.1:1;

[0040] (2) Put the carbon source-coated graphite oxide obtained in step 1 into a quartz glass beaker, add liquid nitrogen, the amount of liquid nitrogen is to submerge the carbon source-coated graphite oxide, and then quickly place the quartz glass beaker into the microwave reaction In the device, the reaction was carried out under the microwave power of 8...

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Abstract

The invention discloses a preparation method of a large-layer-spacing graphite anode material of a sodium-ion battery. The preparation method comprises the following steps of: (1) dissolving a proper amount of carbon source into a solvent, then adding graphite oxide, and after stirring at a rotating speed of 10 to 50rpm to uniformly mix the components, drying to obtain carbon source coated graphite oxide; and (2) placing the carbon source coated graphite oxide obtained in the step 1 into a quartz glass beaker, adding liquid nitrogen, then rapidly placing the quartz glass beaker into a microwave reactor, performing a reaction for 5 to 20 minutes under the microwave power of 250 to 1,000W, and after completely volatilizing the liquid nitrogen, standing for 5 minutes and taking out the product so as to obtain the large-layer-spacing graphite anode material, wherein the quantity of the liquid nitrogen is subject to soaking on the carbon source coated graphite oxide. Compared with conventional graphite and commonly coated and reduced graphite anode, the prepared graphite anode material has the advantages of large layer spacing, high sodium storage capacity, large coulombic efficiency and long cycle life, and meets the requirements of the high-performance sodium-ion battery for comprehensive performance of the anode material.

Description

technical field [0001] The invention relates to the preparation technology of the negative electrode material of the sodium ion battery, and in particular provides a preparation method of the graphite negative electrode material of the large layer spacing of the sodium ion battery. Background technique [0002] The research on sodium-ion batteries and lithium-ion batteries started at a similar time, from the late 1970s to the early 1980s. Lithium-ion batteries have the characteristics of high voltage and high specific energy, so they have made great progress in portable power applications, while the research progress of sodium-ion batteries is relatively slow. With the development of energy storage power supply and electric vehicle power supply, sodium-ion battery has gradually become a research hotspot in recent years due to its abundant raw material reserves, low price, and environmental friendliness, and is considered to be an ideal choice for next-generation energy stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/1393H01M10/054
CPCH01M4/1393H01M4/583H01M10/054H01M2004/021H01M2004/027H01M2220/20Y02E60/10
Inventor 宋宏芳赵东辉戴涛李芳周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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