Preparation method of biomass carbon lithium ion battery negative electrode material

A lithium-ion battery, biomass carbon technology, applied in the field of electrochemical power supply, can solve the problems of unsatisfactory cycle performance, low conductivity, poor electrochemical reaction kinetics, etc., and achieve good cycle stability and abundant biomass resources. , repeatable effect

Inactive Publication Date: 2020-04-28
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 3 VO 4 Low electrical conductivity makes its electrochemical reaction kinetics poor, resulting in unsatisfactory cycle performance

Method used

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  • Preparation method of biomass carbon lithium ion battery negative electrode material
  • Preparation method of biomass carbon lithium ion battery negative electrode material
  • Preparation method of biomass carbon lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cattail ears (such as figure 1 ) in sodium hydroxide solution for 2 hours, then cleaned with deionized water, and then transferred to a blast drying oven at 80°C for drying; the dried cattail ears were placed in N 2 In the environment, calcining at 500°C for 5h at a heating rate of 3°C / min to obtain black biomass carbon. The prepared samples were analyzed by XRD patterns as follows: figure 2 As shown, the obtained diffraction peaks are similar to Na 2 C 60 (PDF#00-047-1577) Correspondingly, there is a broad diffraction peak around 25°, corresponding to amorphous C. NaOH appeared in XRD due to the use of NaOH in the treatment of cattail ears 2 C 60 peak. SEM of the prepared samples as image 3 As shown, after sintering, the cattail ears are in the shape of micron bands, and the surface is wrinkled, which increases the specific surface area of ​​the material. This special morphology makes the battery have a high lithium storage capacity and good cycle stability. ...

Embodiment 2

[0040] Cattail ears (such as figure 1 ) was cleaned with deionized water, and then transferred to a blast drying oven at 80°C for drying; the dried cattail ears were placed in N 2 In the environment, calcining at 600°C for 5h at a heating rate of 3°C / min to obtain black biomass carbon.

[0041] The material obtained in Example 2 was made into a battery according to the method in Example 1. Such as Figure 5 As shown, the first charge and discharge specific capacities are 335.2 and 564.3mAh g respectively -1 , the charge and discharge capacities are 251.6 and 253.7mAh g after 50 cycles -1 , poor electrochemical performance.

Embodiment 3

[0043] Cattail ears (such as figure 1 ) in sodium hydroxide solution for 2 hours, then cleaned with deionized water, and then transferred to a blast drying oven at 80°C for drying; the dried cattail ears were placed in N 2 In the environment, calcining at 600°C for 5h at a heating rate of 3°C / min to obtain black biomass carbon.

[0044] The material obtained in Example 2 was made into a battery according to the method in Example 1. Such as Image 6 As shown, the first charge and discharge specific capacities are 508.0 and 916.9mAh g respectively -1 , there is an obvious charge and discharge platform, and the charge and discharge capacities are 315.9 and 378.0mAh g after 50 cycles -1 , showing good electrochemical performance.

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Abstract

The invention provides a preparation method of a biomass carbon lithium ion battery negative electrode material. The method comprises the following specific steps: ultrasonically treating typha orientalis clusters in a sodium hydroxide solution, cleaning the clusters with deionized water, and transferring the clusters into a blast drying oven at 80 DEG C for drying; adding a certain amount of nitric acid into deionized water, carrying out uniformly stirring, adding a proper amount of V2O5 and LiNO3, stirring for 30 minutes until V2O5 and LiNO3 are completely dissolved, transferring a product into a hydrothermal liner, and carrying out hydrothermal treatment in a blast oven at 100-180 DEG C for 10-24 hours; naturally cooling the obtained clarified solution to room temperature, transferringthe cooled clarified solution to a beaker, concentrating the solution under a water bath condition, adding a proper amount of treated typha orientalis clusters into the solution, performing ultrasonictreatment for 2 hours, and transferring the treated typha orientalis clusters to a blast drying oven at 80 DEG C for drying; and drying the material, placing the dried material in an N2 environment,and carrying out calcining at 500-700 DEG C for 3-5 hours at a heating speed of 3 DEG C / min to obtain the biomass carbon / Li3VO4 composite material. According to the invention, the biomass carbon / Li3VO4 composite material is used as the lithium ion battery negative electrode material for the first time, and has high electrochemical performance.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a biomass (cattail) carbon / Li 3 VO 4 The composite material is used as a negative electrode material and a preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] In recent years, people's demand for energy has increased day by day, which has intensified the consumption of fossil energy. However, with the extensive use of traditional fossil energy such as coal, oil, and natural gas, ecological and environmental problems have become increasingly serious. In order to alleviate the dependence on fossil fuels, people are actively developing and utilizing alternative clean energy sources. Solar energy, wind energy, and water energy are all renewable new energy sources, but most clean energy sources are random and intermittent. To improve the efficiency of this type of energy use, it is necessary to develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M10/0525
CPCH01M4/366H01M4/485H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 倪世兵许真陆俊霖杨学林
Owner CHINA THREE GORGES UNIV
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