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Hard carbon negative electrode material, its preparation method and application

A negative electrode material, hard carbon technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of high cost, complicated preparation process, difficult industrial production, etc., and achieve low cost, good electrochemical performance, and stable product properties Effect

Active Publication Date: 2012-05-30
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the existing hard carbon negative electrode materials with complex preparation process, high cost and difficulty in industrial production, and provide a hard carbon negative electrode material and its preparation method and application

Method used

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  • Hard carbon negative electrode material, its preparation method and application
  • Hard carbon negative electrode material, its preparation method and application
  • Hard carbon negative electrode material, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Crush the coal tar pitch to less than 0.1mm, add 100g of benzaldehyde, 50g of sulfuric acid and 1000g of the coal tar pitch powder into the reaction kettle under stirring and mix, raise the temperature to 200°C for cross-linking reaction and polymerization reaction for 5 hours to obtain cross-linking polymerization After the reaction, it was dissolved in 500g washing oil at 200°C for 2 hours, filtered hot, and the filtrate was vacuum-dried (-0.09~-0.1MPa, 150°C) for 2 hours, cooled to room temperature and discharged. 100-mesh sieve, put it into a well-type carbonization furnace, heat up to 600°C under the protection of nitrogen for pre-carbonization treatment for 2 hours, cool down to room temperature, and pass the crushed material through a 100-mesh sieve after being crushed, and put it in a pusher kiln under the protection of nitrogen Carry out carbonization treatment at 1000° C. for 2 hours to obtain a hard carbon negative electrode material. The first discharge capac...

Embodiment 2

[0040] Grind the coal tar pitch to below 0.1 mm, add 300 g of formaldehyde, 50 g of sulfuric acid and 1000 g of the coal tar pitch powder into the reaction kettle under stirring and mix, raise the temperature to 80°C for cross-linking reaction and polymerization reaction for 10 hours, after the reaction is completed, Dissolve 2000g of toluene at 100°C for 6 hours, heat filter, vacuum-dry the filtrate (-0.09~-0.1MPa, 150°C) for 2 hours, cool down to room temperature, and discharge the material. In the carbonization furnace, the temperature was raised to 400°C for 5 hours under the protection of nitrogen, and the temperature was lowered to room temperature. After crushing, the crushed material was passed through a 100-mesh sieve, and carbonization was carried out at 1000°C in a pusher kiln under the protection of nitrogen. 4 Hours, the hard carbon negative electrode material was prepared, the first discharge capacity of the half-cell was 296.4mAh / g, and the first discharge effici...

Embodiment 3

[0042]Crush the petroleum asphalt to less than 0.1mm, add 200g of paraformaldehyde, 100g of p-toluenesulfonic acid and 1000g of the petroleum asphalt powder into the reaction kettle alternately under stirring and mix, raise the temperature to 150°C for crosslinking reaction and polymerization reaction After 2 hours, dissolve in 1250g xylene at 150°C for 4 hours after the reaction, heat filter, vacuum-dry the filtrate (-0.09~-0.1MPa, 150°C) for 2 hours, cool down to room temperature and discharge, crush the crushed product Pass through a 100-mesh sieve, put it into a well-type carbonization furnace, raise the temperature to 500°C under the protection of nitrogen for pre-carbonization treatment for 4 hours, cool down to room temperature, and pass the crushed material through a 100-mesh sieve, and put it in a pusher kiln under the protection of nitrogen Carbonization treatment at 1600° C. for 2 hours yielded a hard carbon negative electrode material. The initial discharge capacity...

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Abstract

The invention provides a preparation method of a hard carbon negative electrode material. The method comprises the steps of: (1) subjecting a high molecular polymer and a cross-linking agent to crosslinking and polymerization reactions so as to obtain a cross-linked polymer; (2) conducting crushing and screening; (3) under the protection of an inert gas, carrying out pre-carbonization treatment at a temperature of 400-600DEG C, performing cooling to room temperature, and carrying out crushing and screening; (4) under the protection of an inert gas, carrying out carbonization treatment at a temperature of 1000-1600DEG C, thus obtaining a hard carbon negative electrode material. The high molecular polymer is asphalt, epoxy resin or phenolic resin. The invention also provides a hard carbon negative electrode material prepared by the method as well as its application as a lithium ion battery negative electrode material. The preparation method of the invention is simple and practicable, and has easily available and cheap raw materials. The hard carbon negative electrode material provided in the invention has the advantages of: good comprehensive performance; good electrochemical performance; good cycle performance; good high current charge-discharge performance; good security; good adaptability to electrolyte and other additives; and stable product property, with almost no difference among batches.

Description

technical field [0001] The invention relates to a hard carbon negative electrode material, a preparation method and application thereof. Background technique [0002] In the 21st century, with the increasing depletion of oil reserves on the earth and the greenhouse effect caused by vehicle exhaust emissions on the environment, in recent years, as a new application that effectively utilizes the characteristics of small size and light weight of lithium-ion batteries, it is actively being used as a new application that only uses lithium-ion batteries. Development of batteries for electric vehicles (EVs) driven by electric motors and hybrid electric vehicles (HEVs) that combine engines and electric motors, where HEVs that combine engines and battery-driven electric motors are economical and low in fuel consumption. [0003] Hard carbon anode materials have attracted much attention due to their firm and stable macromolecular layer structure, which is more suitable for use under h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/38H01M4/133
CPCY02E60/122Y02E60/10
Inventor 谢秋生乔永民杜旭吴敏昌
Owner SHANGHAI SHANSHAN TECH CO LTD
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