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Preparation method of graphene-ferric fluoride composite cathode material

A composite positive electrode material, iron fluoride technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems that limit practical applications, and achieve the effects of long service life, high capacity, and high cycle stability

Inactive Publication Date: 2013-07-10
NANTONG CHENGGUANG GRAPHITE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However FeF 3 It is a wide bandgap insulator, which severely limits its commercial practical application. In order to improve its electrical conductivity, FeF is mainly 3 Mixed with conductive materials to improve their conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take iron oxalate and cobalt hydroxide, add hydrogen fluoride solution, wherein, the concentration of hydrogen fluoride solution is 25-30wt%, the amount of adding iron oxalate and cobalt hydroxide is determined according to the atomic molar ratio of Fe and Co is 0.95:0.05, the added The amount of hydrogen fluoride is determined according to the molar ratio of fluorine ions to the total molar weight of iron ions and cobalt ions is 3.5:1; stir and react at room temperature in a sealed polytetrafluoroethylene reactor for 3 hours, then raise the temperature to 85°C and continue stirring React for 30 hours, filter with suction, wash with ethanol, dry, and heat-treat in vacuum to obtain cobalt-doped iron fluoride powder.

[0016] Disperse 1 g of graphite oxide in 600 mL of deionized water, disperse a certain amount of graphite oxide in deionized water, and use ultrasonic treatment for 12 hours to peel graphite oxide into graphite oxide nanosheets, and obtain a uniform dispersi...

Embodiment 2

[0019] Get ferric oxalate and cobalt hydroxide, add hydrogen fluoride solution, wherein, the concentration of hydrogen fluoride solution is 30wt%, the amount of adding ferric oxalate and cobalt hydroxide is determined according to the atomic molar ratio of Fe and Co as 0915: 0.085, the added hydrogen fluoride The amount is determined according to the molar ratio of fluorine ions to the total molar weight of iron ions and cobalt ions is 4:1; stir and react at room temperature in a sealed polytetrafluoroethylene reactor for 5 hours, then raise the temperature to 90°C, and continue to stir and react for 20 hours , filtered with suction, washed with ethanol, dried, and heat-treated in vacuum to obtain cobalt-doped ferric fluoride powder.

[0020] Disperse 1 g of graphite oxide in 800 mL of deionized water, disperse a certain amount of graphite oxide in deionized water, and use ultrasonic treatment for 15 hours to peel graphite oxide into graphite oxide nanosheets to obtain a unifor...

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Abstract

The invention relates to a preparation method of a graphene-ferric fluoride composite cathode material. The preparation method comprises the following steps of: (1) preparing cobalt-doped ferric fluoride powder; (2) preparing a silicon-doped graphite mixture; (3) mixing the cobalt-doped ferric fluoride powder with the silicon-doped graphite in a ball milling way, and thermally processing after ball milling, thus obtaining the graphene-ferric fluoride composite cathode material. The graphene-ferric fluoride composite cathode material for a lithium ion battery, prepared by the preparation method provided by the invention, has the advantages that a ferric fluoride material which has large discharge capacity is modified by doping cobalt, thus the conductivity is improved; then the ferric fluoride material is combined with a silicon-doped graphene material which has high conductivity and stability, therefore, the characteristics of large capacity and high circulating stability are provided; and as a result, the composite material is relatively large in capacity and relatively long in service life while being applied to the lithium ion battery.

Description

Technical field [0001] The invention relates to a preparation method of a graphene-ferric fluoride composite cathode material. Background technique [0002] Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile appliances such as mobile phones and notebook computers. As a power battery, lithium-ion batteries also have broad application prospects in electric bicycles and electric vehicles. Padhi's pioneering research in 1997 revealed the understanding of olivine-type LiFePO 4 The prologue of the research. LiFePO 4 It has the advantages of high theoretical specific capacity (170mAh / g), moderate voltage platform (about 3.4V), excellent cycle performance, abundant raw material sources, low price, good safety and environmental protection. However, the olivine-type structure leads to its low electrical conductivity and Li-ion mobility, which greatly limits its...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/58
CPCY02E60/10
Inventor 马军昌
Owner NANTONG CHENGGUANG GRAPHITE EQUIP
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