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Preparation method of graphene-ferric fluoride composite positive electrode material

A composite positive electrode material, ferric fluoride technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of limited practical application, low conductivity and lithium ion mobility, and achieve long service life, high capacity, high The effect of cycle stability

Inactive Publication Date: 2018-01-16
南通德诺尔石墨设备有限公司
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Problems solved by technology

However, the olivine-type structure leads to its low electrical conductivity and Li-ion mobility, which greatly limits its practical application.

Method used

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specific Embodiment

[0011] Specific embodiment: a kind of preparation method of graphene-ferric fluoride composite cathode material specifically comprises the following steps:

[0012] (1) Preparation of silicon-doped graphite mixture

[0013] Disperse every 2g of graphite oxide in 150-350mL of deionized water, filter, fully wash with deionized water and ethylene glycol, and dry to obtain a silicon-doped graphite mixture;

[0014] (2) Preparation of cobalt-doped ferric fluoride materials

[0015] Take cobalt hydroxide and add hydrogen fluoride solution, wherein the concentration of hydrogen fluoride solution is 10-20wt%; stir and react at room temperature for 1-2h in a sealed reactor, then heat up to 85-90°C, suction filter, wash with ethanol, and dry Drying, heat treatment in vacuum to obtain cobalt-doped ferric fluoride powder;

[0016] (3) Synthesis of graphene-ferric fluoride composite cathode material

[0017] (4) The above-mentioned cobalt-doped ferric fluoride powder and the above-menti...

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Abstract

The invention discloses a preparation method of a graphene-ferric fluoride composite positive electrode material and relates to a preparation method of a graphene-ferric fluoride composite positive electrode material. A ferric fluoride material with high discharge capacity is subjected to cobalt-doping modification to improve the conductivity thereof, and then is compounded with a silicon-doped graphene material with good conductivity and stability. The preparation method specifically comprises the following steps of (1) preparing a silicon-doped graphite mixture; (2) preparing cobalt-doped ferric fluoride powder; and (3) carrying out ball-milling mixing on the cobalt-doped ferric fluoride powder and the silicon-doped graphite and then carrying out thermal treatment to obtain a product. According to the prepared graphene-ferric fluoride composite positive electrode material for a lithium-ion battery, the lithium-ion battery has the characteristics of high capacity and high cycling stability, and has relatively high capacity and relatively long service life.

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 opened the prelude to the research on olivine-type LiFePO4. LiFePO4 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 practical application. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58
CPCY02E60/10
Inventor 张红星
Owner 南通德诺尔石墨设备有限公司
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