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Preparation method of lithium ion battery negative electrode material charcoal microballoon

A technology of negative electrode materials and carbon microspheres, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of large irreversible capacity, complex process, high cost, etc., and achieve excellent electrochemical performance, low preparation cost, and high compressive strength. Effect

Inactive Publication Date: 2011-10-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of carbon microspheres, a lithium battery negative electrode material; to solve the problems of poor carbon microspheres in the prior art, high cost, low yield, complicated process, etc. Relatively large irreversible capacity, severe voltage hysteresis and sensitivity to air and other defects, the carbon microspheres prepared according to the method of the present invention have uniform particle size, smooth surface, high compressive strength, and excellent electrochemical performance

Method used

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  • Preparation method of lithium ion battery negative electrode material charcoal microballoon
  • Preparation method of lithium ion battery negative electrode material charcoal microballoon
  • Preparation method of lithium ion battery negative electrode material charcoal microballoon

Examples

Experimental program
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Effect test

Embodiment 1

[0059] 1. Synthesis of N-phenylmaleimide modified phenolic resin

[0060]Add phenol, formaldehyde, N-phenylmaleimide and catalyst in a certain ratio (10:74:14:2, weight ratio) into a three-necked flask, and raise it to a certain reaction temperature (70-80°C) to start Phenol is added dropwise, and after a certain time (10-12 hours) of reflux reaction, water and formaldehyde are distilled off under reduced pressure to end the reaction. The product is dissolved in acetone (the mass ratio of resin to acetone is 1:5), and the Is Jia Shi empty? 0%) mixed solution (resin and mixed solution mass ratio is 1: 10) in the separatory funnel, raw material monomers such as unreacted N-phenylmaleimide are dissolved in acetone and are in the upper layer of mixed solution, N-phenyl The base maleimide-modified phenolic resin product precipitated in the lower layer of the mixed solution, and this process was repeated twice continuously. The precipitated product was separated and dried in a v...

Embodiment 2

[0064] Synthesize N-phenylmaleimide modified phenolic resin according to step (1) of Example 1. Put the prepared resin into a mortar for grinding, and then sieve through a 200-mesh sieve after grinding. Get a 1000ml three-necked flask, measure 500ml of silicone oil and pour it into it, then put 50g of resin powder, under the protection of nitrogen, put the three-necked flask into the electric heating mantle, stir (stirring speed is 1000rpm), and at 160 ℃ insulation 2h. Using tetrahydrofuran as a solvent, the silicone oil on the surface of the resin microspheres was removed by centrifugation, and then the microsphere samples were vacuum-dried at 100° C. for 6 hours to obtain a resin microsphere sample. Put the above resin microspheres into a high-temperature tube furnace, and pass through Ar 2 , the temperature was raised to 900°C at 5°C / min, and then kept for 2h, and cooled to room temperature in the furnace to obtain carbon microspheres.

Embodiment 3

[0066] Synthesize N-phenylmaleimide modified phenolic resin according to step (1) of Example 1. Put the prepared resin into a mortar for grinding, and then sieve through a 200-mesh sieve after grinding. Take a 1000ml three-neck flask, measure 500ml of silicone oil into it, and then put 80g of resin powder, under the protection of nitrogen, put the three-necked flask into the electric heating mantle, stir, and keep it at a certain temperature for 4 hours at 160°C . Using tetrahydrofuran as a solvent, the silicone oil on the surface of the resin microspheres was removed by centrifugation, and then the microsphere samples were vacuum-dried at 100° C. for 8 hours to obtain a resin microsphere sample. Put the resin microspheres into a high-temperature tube furnace and pass through Ar 2 , the temperature was raised to 1050°C at 10°C / min, and then kept for 1h, and cooled to room temperature in the furnace to obtain carbon microspheres.

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Abstract

The invention provides a preparation method of lithium ion battery negative electrode material charcoal microballoon, belonging to the charcoal microballoon field. The method solves the problems that charcoal microballoon is poor in performance, high in cost, low in yield and complex in process and substantial irreversible capacity and serious voltage hysteresis are easy to be caused as phenolic resin is adopted as raw material and overcomes the defect that the existing microballoon is sensitive to air in the prior art, and the method mainly includes that N-benzyl maleimide modified phenolic resin is taken as precursor, silicone oil is taken as dispersing agent, suspension polymerization method is adopted to prepare resin microballoon, and then the resin microballoon is directly carbonized to prepare the charcoal microballoon. The charcoal microballoon prepared by the method of the invention has uniform grain diameter, smooth surface, high compression strength and favourable electrochemical properties.

Description

technical field [0001] The invention belongs to the field of carbon materials, and mainly relates to a preparation method of carbon microspheres, a negative electrode material of a high-performance lithium battery. Background technique [0002] In recent years, as a new type of high-energy storage battery, lithium-ion batteries have made significant progress in research and development. However, since the research on lithium-ion batteries is an interdisciplinary project involving chemistry, physics, materials, energy and electronics, there are still many problems in the development. In particular, the research on negative electrode materials has not yet found an ideal negative electrode material for lithium-ion batteries. The research focus of negative electrode materials will be towards high specific capacity, high charge and discharge efficiency, high cycle performance and lower cost. The specific capacity of practical anode materials will break through LiC 6 theoretica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393
CPCY02E60/10
Inventor 林起浪郑敏枝
Owner FUZHOU UNIV
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