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Method for improving the charge-discharge cycle capability of ferroferric oxide by doping graphite oxide

A ferric oxide, charging and discharging technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of reducing battery cycle life, electrode damage, crystal structure collapse, etc., and achieves simple and easy heat treatment process and increased conductivity. , the effect of reducing volume expansion

Active Publication Date: 2015-09-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charge-discharge cycle, the volume of ferroferric oxide undergoes large shrinkage and expansion, which causes the collapse of the crystal structure, leads to the destruction of the electrode, and reduces the cycle life of the battery.

Method used

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  • Method for improving the charge-discharge cycle capability of ferroferric oxide by doping graphite oxide
  • Method for improving the charge-discharge cycle capability of ferroferric oxide by doping graphite oxide
  • Method for improving the charge-discharge cycle capability of ferroferric oxide by doping graphite oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Get raw material graphite oxide and ethylene glycol to mix, wherein the amount of graphite oxide is 0.03-0.7 gram, and the amount of ethylene glycol is 12-92 milliliters;

[0029] (2) Ultrasonic treatment of the above mixture for 35-115 minutes to form a suspension;

[0030] (3) Add 0.03-13 mmoles of ferric chloride, 5-95 mmoles of sodium acetate and 0.03-5 mmoles of cetyltrimethylammonium bromide in sequence to the suspension, and stir for 12-52 minutes ;

[0031] (4) Put the above-mentioned mixed solution into a reaction kettle for solvothermal reaction. The heat treatment temperature is 35-225 degrees Celsius, and the heat treatment time is 720-1920 minutes. washing, and finally drying the obtained precipitate at 55-115 degrees centigrade for 5.5-11 hours to obtain ferric oxide / graphite oxide composite material.

Embodiment 2

[0033] (1) Get the raw material graphite oxide and ethylene glycol to mix, wherein the amount of graphite oxide is 0.04-0.75 grams, and the amount of ethylene glycol is 18-98 milliliters;

[0034] (2) Ultrasonic treatment of the above mixture for 40-110 minutes to form a suspension;

[0035] (3) Add 0.04-14 mmol ferric chloride, 10-90 mmol sodium acetate and 0.04-9 mmol cetyltrimethylammonium bromide successively to the above suspension, and stir for 15-55 minutes ;

[0036] (4) Put the above-mentioned mixed solution into a reaction kettle for solvothermal reaction. The heat treatment temperature is 40-220 degrees Celsius, and the heat treatment time is 840-2040 minutes. washing, and finally drying the obtained precipitate at 60-110 degrees Celsius for 6-10 hours to obtain ferric oxide / graphite oxide composite material.

Embodiment 3

[0038] (1) Get raw material graphite oxide and ethylene glycol to mix, wherein the amount of graphite oxide is 0.05-0.9 gram, and the amount of ethylene glycol is 16-95 milliliters;

[0039] (2) ultrasonically treating the above mixture for 32-112 minutes to form a suspension;

[0040] (3) Add 0.05-12 mmoles of ferric chloride, 12-92 mmoles of sodium acetate and 0.05-8 mmoles of cetyltrimethylammonium bromide in turn to the above suspension, and stir for 20-50 minutes ;

[0041] (4) Put the above-mentioned mixed solution into a reaction kettle for solvothermal reaction. The heat treatment temperature is 45-215 degrees Celsius, and the heat treatment time is 960-2100 minutes. washing, and finally drying the obtained precipitate at 65-100 degrees centigrade for 6.5-10.5 hours to obtain ferric oxide / graphite oxide composite material.

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Abstract

The invention discloses a method for improving the charge-discharge cycling capability of ferroferric oxide by doping graphite oxide. A composite material is prepared from raw materials such as iron chloride, sodium acetate, ethylene glycol, cetyl trimethyl ammonium bromide and the graphite oxide by a solvent-thermal reaction method. The composite material is prepared by the following steps of: (1) adding 0.01 to 1.0 gram of graphite oxide into 10 to 100 milliliters of ethylene glycol, and performing ultrasonic treatment for 30 to 120 minutes to form a suspension; and (2) sequentially adding the iron chloride, the sodium acetate and the cetyl trimethyl ammonium bromide into the suspension, stirring the mixed solution for 10 to 60 minutes, placing the mixed solution in a reaction kettle for solvent-thermal reaction, and finally performing centrifugal separation, washing and drying to obtain the ferroferric oxide / graphite oxide composite material. The material can be used as an anode material for a lithium ion battery as well as an electrode material for a supercapacitor, and is simple in synthesis and low in cost.

Description

technical field [0001] The invention relates to a method for preparing a nanocomposite material, in particular to a method for preparing a negative electrode material of a lithium ion battery, iron ferric oxide / graphite oxide composite material, by a solvothermal method, and belongs to the technical field of advanced nanocomposite material preparation technology. Background technique [0002] Since Japan's Sony Corporation commercialized lithium-ion batteries in the 1990s, lithium-ion batteries have become popular in mobile phones, notebook computers, Ideal power supply for digital cameras, video cameras, electric vehicles, hybrid vehicles and various portable instruments. In lithium-ion batteries, the positive electrode material and negative electrode material, which are lithium storage materials, are the main components of the battery and play a decisive role in its electrochemical performance. [0003] At present, graphite is widely used as an anode material for commerci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/52
CPCY02E60/10
Inventor 金波杨治政刘安辉王慧远刘光印钟晓斌王邦勇马新周杨墨
Owner JILIN UNIV