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Method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite

A technology of asphalt-coated graphite and capacitor batteries, which is applied in battery electrodes, circuits, electrode manufacturing, etc., can solve the problems of poor electrical conductivity of activated carbon, long preparation cycle, and less electrode materials, so as to achieve fast charging and discharging, and improve charging and discharging. Efficiency, the effect of increasing the degree of graphitization

Inactive Publication Date: 2009-12-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in lithium-ion capacitor batteries, there is a prominent problem that there are few electrode materials for this energy storage method. Chinese patent CN 101071852A uses a silica template method to prepare graphite-activated carbon negative electrode materials for super capacitor batteries, but this method The preparation cycle is long and the cost is high
In addition, the conductivity of activated carbon, the electrode material of supercapacitors, is poor.

Method used

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  • Method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite
  • Method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite
  • Method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite

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Experimental program
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Effect test

Embodiment 1

[0028] Mix ferric nitrate, distilled water and absolute ethanol uniformly in a mass ratio of 1:10:100; add graphite, pitch powder and conductive agent to the above mixed solution, wherein the added graphite is mesophase carbon microspheres, and the conductive agent is carbon black , the mass ratio added is asphalt powder:graphitization catalyst=100:1; graphite:pitch powder=2:1; conductive agent:graphite=0.3:1. Stir and mix for 5 hours, then dry the obtained mixture in the air at 80°C; carry out pyrolysis of the dried mixture under the protection of Ar atmosphere, the pyrolysis temperature is 650°C, and the holding time is 15 hours; the mass fraction is Washing with 10% nitric acid solution to remove ferric nitrate, fully washing with distilled water, and drying to obtain a negative electrode material of low-temperature pyrolysis pitch-coated graphite for high-rate lithium-ion capacitor batteries.

[0029] figure 1 The SEM image of the prepared low-temperature pyrolysis pitch-...

Embodiment 2

[0031] Ferric nitrate, distilled water and dehydrated alcohol are mixed uniformly by mass ratio 1: 15: 100; Add graphite, asphalt powder and conductive agent in above-mentioned mixed solution, wherein the graphite added is artificial graphite, and conductive agent is carbon nanotube, adds The mass ratio of pitch powder:graphitization catalyst=100:1; graphite:pitch powder=2.5:1; conductive agent:graphite=0.01:1. Stir and mix for 6 hours, then dry the obtained mixture in the air at 80°C; carry out pyrolysis of the dried mixture under the protection of Ar atmosphere, the pyrolysis temperature is 800°C, and the holding time is 10 hours; the mass fraction is Washing with 20% nitric acid solution to remove ferric nitrate, fully washing with distilled water, and drying to obtain a negative electrode material of low-temperature pyrolysis pitch-coated graphite for high-rate lithium-ion capacitor batteries.

[0032] figure 2 The phase analysis results of the prepared low-temperature p...

Embodiment 3

[0035]Mix boric acid, distilled water and absolute ethanol uniformly in a mass ratio of 1:20:100; add graphite, pitch powder and a conductive agent to the above mixed solution, wherein the added graphite is natural graphite, and the conductive agent is carbon fiber. The mass ratio added For example, asphalt powder:graphitization catalyst=100:1; graphite:pitch powder=1:1; conductive agent:graphite=0.2:1. Stir and mix for 8 hours, then dry the resulting mixture in air at 80°C; dry the obtained mixture under N 2 Carry out pyrolysis under the protection of atmosphere, the pyrolysis temperature is 700 ℃, and the holding time is 12 hours; the iron nitrate is removed by washing with a nitric acid solution with a mass fraction of 15%, fully washed with distilled water, and dried to obtain a low-temperature thermal solution for a high-rate lithium ion capacitor battery. Anode material of pitch-coated graphite.

[0036] After testing, the above-mentioned low-temperature pyrolysis pitch...

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Abstract

The invention relates to a method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite, belonging to the technical field of the preparation of energy storage material. The invention comprises the steps that: first, mixed solution containing graphitizing catalyst, water and alcohol is formulated, then graphite, asphalt powder and conductive agent are added therein for being mixed for several hours, the resultant mixture is dried in an atmosphere of the air, the asphalt is then pyrolyzed in an atmosphere of Ar or N2, and in the end, salpeter solution is used to remove the graphitizing catalyst by means of dissolution, and the high rate lithium ion capacitor battery cathode material with pyrolyzed asphalt covering the graphite is obtained by sufficient washing and drying. The cathode material obtained according to the method has the characteristics of high capacity and good high rate performance, is simple in process flow and includes tremendous application value.

Description

technical field [0001] The invention belongs to the technical field of energy storage material preparation, and in particular relates to a method for preparing a high-rate lithium-ion capacitor battery negative electrode material by low-temperature pyrolysis of pitch-coated graphite. technical background [0002] Since the first commercialization of lithium-ion batteries by Sony Corporation in the 1990s, lithium-ion battery technology has developed rapidly. Lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. They have been widely used in portable devices such as notebook computers, mobile phones, and digital products. With the increasing shortage of oil resources, the increasingly serious environmental pollution and the strong demand for automobile consumption, lithium-ion batteries as the power source of electric vehicles or hybrid electric vehicles have become a hot spot of glob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王志兴方杰郭华军李新海李灵均彭文杰张云河胡启阳
Owner CENT SOUTH UNIV
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