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Preparation method of chitosan-based spherical negative lithium ion battery carbon electrode

A technology of lithium-ion batteries and chitosan, which is applied in the direction of battery electrodes, carbon preparation/purification, negative electrodes, etc., can solve the problems of no research on the performance of lithium battery negative electrodes, large surface area of ​​nanoparticles, high hydrothermal reaction temperature, etc., and achieve good results Rate performance and cycle stability, a wide range of sources, and the effect of improving lithium storage performance

Active Publication Date: 2019-02-15
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above methods mainly have the following limitations: The author of the document "One-step synthesis of amino-functionalized fluorescent carbon nanoparticles by hydrothermalcarbonization" prepared nano-scale particles, and did not study the performance of lithium battery negative electrodes. Nano-particles have large surface area and packing density Small and other deficiencies are not suitable for direct use as lithium battery negative electrode materials, micron-scale materials are needed
The patent introduces the preparation of supercapacitor electrode materials by means of high-pressure reaction and KOH activation. The prepared samples are non-spherical, the process is complicated, the hydrothermal reaction temperature is high, and the time is long

Method used

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  • Preparation method of chitosan-based spherical negative lithium ion battery carbon electrode
  • Preparation method of chitosan-based spherical negative lithium ion battery carbon electrode
  • Preparation method of chitosan-based spherical negative lithium ion battery carbon electrode

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Embodiment 1

[0026] Dissolve 3g of chitosan in 65ml of 2.5M hydrochloric acid solution, stir in a water bath at room temperature for 3 hours, raise the temperature to 70°C and stir for 10 hours, add the evenly mixed solution to the stainless steel lined with polytetrafluoroethylene to react In the kettle, seal it and put it in an oven to react at 190°C for 7 hours. Cool naturally to room temperature, filter, wash, and dry to obtain hydrothermal carbon with a particle size distribution of 1.32-4.49um, and then carbonize at a high temperature of 700°C for 2 hours under an inert atmosphere to obtain a nitrogen-containing spherical carbon negative electrode material.

[0027] The obtained carbon microspheres were used as lithium-ion negative electrode materials to assemble the battery, and the working electrode was prepared according to the ratio of sample: conductive agent acetylene black: polyvinylidene fluoride = 92:3:5, and the metal lithium sheet was used as a reference electrode to test i...

Embodiment 2

[0030] Dissolve 3g of chitosan in 65ml of 2.5M hydrochloric acid solution, stir in a water bath at room temperature for 3 hours, raise the temperature to 70°C and stir for 10 hours, add the evenly mixed solution to the stainless steel lined with polytetrafluoroethylene to react In the kettle, seal it and put it in an oven to react at 180°C for 7 hours. Cool naturally to room temperature, filter, wash, and dry to obtain hydrothermal carbon with a particle size distribution of 1.03-5.32um, and then carbonize at a high temperature of 700°C for 2 hours under an inert atmosphere to obtain a nitrogen-containing spherical carbon negative electrode material.

[0031] The obtained carbon material was assembled into a battery and tested for electrochemical performance. At a current density of 50mA / g, the initial discharge specific capacity was 579.9mAh / g, and the reversible specific capacity was 292.6mAh / g.

Embodiment 3

[0033] Dissolve 3g of chitosan in 65ml of 2.5M hydrochloric acid solution, stir in a water bath at room temperature for 3 hours, raise it to 70°C and stir for 10 hours, and add the uniformly mixed solution to a stainless steel reaction kettle lined with polytetrafluoroethylene After sealing, put it in an oven to react at 200°C for 10 hours. Naturally cooled to room temperature, filtered, washed, and dried to obtain a hydrothermal carbon sample.

[0034] The hydrothermal carbon sample was scanned by an electron microscope, the particle size distribution was 1-5.49um, and the carbon spheres were fused and cross-linked.

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Abstract

The invention relates to a preparation method of a chitosan-based spherical negative lithium ion battery carbon electrode. The preparation method comprises the following steps: taking chitosan as a raw material, dissolving the chitosan in a certain proportion of hydrochloric acid solution, stirring at a room temperature for 3 hours, then heating to a certain temperature, stirring for several hours, adding a uniformly mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, sealing, then reacting at the temperature of 120-200 DEG C for 5-12 hours, naturally cooling to a room temperature, filtering, washing and drying to obtain hydrothermal charcoal with the particle size distribution of 1-6 microns, then performing high-temperature carbonization in an inert atmosphere to obtain the nitrogen-containing spherical negative carbon electrode. By the preparation method, the raw material is cheap and easy to obtain, a synthesis technology is simple and easy to implement, a negative electrode material is stable and non-toxic in air, is used as the negative electrode material of a lithium ion battery and shows superior electrochemical performance.

Description

technical field [0001] The invention relates to a hydrothermal preparation method of bio-based carbon microspheres and an application in lithium ion batteries, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Environmental pollution and energy shortage are two increasingly serious problems facing the world today. Therefore, the development and application of new clean energy has become an urgent and primary issue, and has become a technology that determines influence in the world economy. Lithium-ion batteries have outstanding advantages such as small size, light weight, high energy density, good cycle stability, small self-discharge, no memory effect, safety and reliability, and no pollution. They have attracted extensive attention from researchers; In the future, it will become an important chemical power source for personal portable terminals such as hybrid vehicles and electric vehicles, and modern high-t...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 宋怀河宋赛鹰曹瑞雄马兆昆恽海顺
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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