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Preparation method of graphite-ferroferric oxide composite cathode material

A technology of ferroferric oxide and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor electrical conductivity, difficulty in commercial application, and need to improve the first charge and discharge efficiency, and achieve fast charge and discharge speed , high capacity and long service life

Inactive Publication Date: 2013-07-24
马军昌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the three iron oxide materials, α-Fe2O3 has the highest theoretical specific capacity, about 1005mAh / g, but its electrical conductivity is extremely poor. Even when preparing electrodes for low-power charging and discharging, it is often necessary to add about 40% conductive agent, it is difficult to achieve commercial application
However, the delithiation of Fe3O4 needs to be more sufficient, and the first charge and discharge efficiency needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Prepare the ferrous chloride solution that concentration is 1.5mol / L with deionized water and ferrous chloride, prepare the potassium hydroxide solution that concentration is 2mol / L with deionized water and potassium hydroxide, heat ferrous chloride solution To 95°C, add the potassium hydroxide solution to the ferrous chloride solution by spraying, while bubbling oxygen into the solution, stop spraying the sodium hydroxide solution when no new precipitates appear, and then add chlorine Carbon black with a ferrous content of 2% is blown into oxygen for 20 minutes, and the precipitate is obtained by filtration, and the precipitate is washed with deionized water until there are no hydrochloride particles, and the precipitate is dried at 800°C for reduction , crush the reduced material to pass through a 30-mesh sieve to obtain the active material Fe 3 o 4 .

[0016] First, uniformly coat the carbon layer on the surface of the nano-silicon sphere powder by chemical vapor ...

Embodiment 2

[0019] With deionized water and ferrous chloride preparation concentration is the ferrous chloride solution of 2mol / L, with deionized water and potassium hydroxide preparation concentration is the potassium hydroxide solution of 3mol / L, ferrous chloride solution is heated to At 99°C, add the potassium hydroxide solution to the ferrous chloride solution by spraying, while bubbling oxygen into the solution, stop spraying the sodium hydroxide solution when no new precipitates appear, and then add the chloride solution. Carbon black with a ferrous content of 3% was blown with oxygen for 40 minutes, and the precipitate was obtained by filtration. The precipitate was washed with deionized water until no hydrochloride particles were present. After the precipitate was dried, it was reduced at 850°C. The reduced material is crushed to pass through a 30-mesh sieve to obtain the active material Fe 3 o 4 .

[0020] First, uniformly coat the carbon layer on the surface of the nano-silic...

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Abstract

The invention relates to a preparation method of graphite-ferroferric oxide composite cathode material, and the method comprises the following steps of: (1) preparing an active substance Fe3O4; (2) uniformly coating a carbon layer on the surface of nano-silicon particle powder via the chemical vapor deposition method, then ball-milling and mixing the nano-silicon particle powder coated with the carbon layer, and graphite to obtain a high-reversible-capacity graphite mixture; and (3) weighing a specified amount of the active substance Fe3O4; adding dysprosium oxide, the high reversible capacity graphite mixture and PVA (polyvinyl alcohol) binder; and mixing substances uniformly to obtain the graphite-ferroferric oxide composite cathode material. The graphite-ferroferric oxide composite cathode material prepared according to the preparation method disclosed in the invention has the characteristics of integration of high capacity, high charge and discharge rate and high cycling stability due to combination of the ferroferric oxide composite cathode material with high specific capacity and the high reversible capacity graphite material.

Description

Technical field [0001] The invention relates to a preparation method of graphite-ferric oxide composite negative electrode material. Background technique [0002] Energy is an important material basis for the development of human society, but the sharp decline in the stock of mineral energy such as coal, oil, and natural gas has caused human beings to face the pressure of resource depletion, and the problem of environmental pollution is also becoming more and more serious. Therefore, energy and environmental issues have become the focus of attention of countries all over the world. Improving energy efficiency, developing and utilizing renewable energy, protecting the ecological environment, and realizing sustainable development have become the common goals and topics of governments and researchers of all countries. Strategically speaking, the development of renewable energy is fundamental to solving energy problems, so research in this area has received widespread attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/52
CPCY02E60/10
Inventor 马军昌
Owner 马军昌
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