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Preparation method of sodium ion battery negative electrode material

A technology for sodium ion batteries and negative electrode materials, applied in battery electrodes, carbon preparation/purification, secondary batteries, etc., can solve the problems that graphite is not suitable for sodium ion intercalation and extraction, etc., to achieve abundant output, wide sources, and improved The effect of electrochemical performance

Pending Publication Date: 2021-11-09
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial lithium-ion batteries mostly use graphite as the negative electrode material, but graphite interlayer spacing is too small to be suitable for intercalation and extraction of sodium ions. Therefore, it is necessary to choose a material with a larger interlayer spacing as the sodium storage negative electrode material.

Method used

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  • Preparation method of sodium ion battery negative electrode material
  • Preparation method of sodium ion battery negative electrode material
  • Preparation method of sodium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 5g of starch and 0.05g of carbon black and add them to the mixer, adjust the stirring speed to 600r / min, after stirring for 1 hour, take the mixture out into the crucible and place it in a muffle furnace, set the temperature at 220°C for 6h for stabilization treatment , put the stabilized sample into a carbonization furnace, raise the temperature to 1000°C at a rate of 2°C / min in a nitrogen atmosphere and keep it for 1h, then cool to room temperature, take out the carbonized sample, and obtain a starch-based sodium ion battery Negative material.

[0026] The obtained starch-based carbon microspheres were assembled into a sodium ion battery, and the working electrode was prepared according to the ratio of sample: conductive agent: binder = 80:10:10, and the metal sodium sheet was used as the counter electrode, and its electrochemical performance was tested. The test condition is 25°C, the current density is 0.05-5A / g, and the voltage range is 0.01-2.8V.

[0027] a...

Embodiment 2

[0029] Weigh 5g of starch and 0.5g of carbon black and add them to the mixer, adjust the stirring speed to 600r / min, after stirring for 1 hour, take the mixture out into the crucible and place it in a muffle furnace, set the temperature at 220°C for 6h for stabilization treatment , put the stabilized sample into a carbonization furnace, raise the temperature to 1000°C at a rate of 2°C / min in a nitrogen atmosphere and keep it for 1h, then cool to room temperature, take out the carbonized sample, and obtain a starch-based sodium ion battery Negative material. Under the current density of 0.05A / g, after 50 cycles, the reversible specific capacity is 265.3mAh / g, and the capacity retention rate is 97.2%.

Embodiment 3

[0031] Weigh 5g of starch and 0.005g of carbon black and add them to the mixer, adjust the stirring speed to 600r / min, after stirring for 1 hour, take the mixture out into the crucible and place it in a muffle furnace, set the temperature at 220°C for 6h for stabilization treatment , put the stabilized sample into a carbonization furnace, raise the temperature to 1000°C at a rate of 2°C / min in a nitrogen atmosphere and keep it for 1h, then cool to room temperature, take out the carbonized sample, and obtain a starch-based sodium ion battery Negative material. Under the current density of 0.05A / g, after 50 cycles, the reversible specific capacity is 259.5mAh / g, and the capacity retention rate is 94.2%.

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Abstract

The invention discloses a preparation method of a sodium ion battery negative electrode material, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: mechanically and uniformly mixing starch and carbon black according to a certain proportion, then performing stabilization treatment in a muffle furnace at 200-260 DEG C, and finally performing high-temperature carbonization at 800-1600 DEG C in a nitrogen atmosphere to obtain starch-based carbon microspheres. The added carbon black particles are uniformly dispersed on the surfaces of the starch particles, and the starch particles are separated from one another, so that the starch particles are uniformly heated in the stabilization process, the dehydration reaction of starch molecules and the breakage of molecular chains are facilitated, the problems of foaming and melting in the high-temperature carbonization process are avoided, and the integrity of the spherical morphology of the starch particles is maintained. The raw materials are green, environment-friendly and renewable, the preparation process is simple, and the material shows high reversible capacity and cycling stability when being used as a sodium-ion battery negative electrode material.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion battery and an application in the sodium ion battery, belonging to the technical field of the sodium ion battery. Background technique [0002] With the rapid development of automobile electrification and energy storage devices, lithium-ion batteries are widely used in 3C electronics and new energy vehicles due to their advantages such as high output voltage, long cycle life, low self-discharge rate, no memory and no pollution. . However, with the continuous consumption of lithium resources, lithium sources are becoming more and more scarce. As a congener element of lithium, sodium, the content of sodium in the earth's crust is about 300 times that of lithium. Sodium-ion batteries are expected to become a supplement to lithium-ion batteries due to their abundant raw material reserves, low cost, and no pollution. [0003] Anode materials are one of the most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/36H01M4/587H01M4/62H01M10/054
CPCC01B32/05H01M4/362H01M4/587H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 宋怀河刘学伟刘海燕曹瑞雄刘昭斌邢涛王雯雯
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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