Preparation method and use of graphite/Prussian blue composite material

A technology of Prussian blue and composite materials, applied in the field of graphite/Prussian blue composite material preparation, can solve the problems of capacity decay and poor rate performance, and achieve the effect of increasing electrical conductivity, good rate performance and improving long-term cycle performance

Active Publication Date: 2017-03-01
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the current Prussian blue electrode material has poor capacity fading and poor rate performance when used.

Method used

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  • Preparation method and use of graphite/Prussian blue composite material
  • Preparation method and use of graphite/Prussian blue composite material
  • Preparation method and use of graphite/Prussian blue composite material

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Embodiment 1

[0032] Embodiment one: if figure 1 , figure 2 Shown, a kind of graphite / Prussian blue composite material preparation method is characterized in that, comprises the steps:

[0033] S01. Take by weighing 4mmol (0.796g) ferrous chloride and 2mmol (0.968g) sodium ferrocyanide and dissolve them in 100ml deionized water respectively, and correspondingly record the obtained solutions as A solution and B solution;

[0034] S02. Add 50 mg of surfactant F127 to the A solution, and ultrasonically stir until the clear liquid is recorded as C solution, and set aside;

[0035] S03, the B solution is ultrasonically stirred to a clear liquid, and set aside;

[0036] S04. Transfer the C solution and the B solution after ultrasonic stirring to the reaction kettle, tighten the lid of the kettle and transfer it to the oven. min, after rising to the highest temperature, react for 10h to 30h, then program to cool down to room temperature, the cooling rate is 0.1°C / min to 1°C / min, and a light bl...

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Abstract

The invention relates to a preparation method of a graphite/Prussian blue composite material. The preparation method comprising that ferrous chloride and sodium ferrocyanide undergo a hydrothermal reaction in an aqueous solution of a surfactant based on a coprecipitation method to produce Prussian blue nanospheres, the Prussian blue nanospheres and graphite oxide are stirred, and the solution is quenched by liquid nitrogen, then is freeze-dried and finally is reduced through hydrazine hydrate. The invention discloses a use of the graphite/Prussian blue composite material as a sodium ion battery positive electrode material. The Prussian blue nanospheres have excellent electrochemical performances. Graphene roll coating further increases the conductivity of the Prussian blue nanospheres and improves the long cycle performance of the Prussian blue nanospheres. The capacity of a sodium ion battery positive electrode prepared from the graphite/Prussian blue composite material is not easy to decay, the magnification performance is good, and after cycle 500 times under current density of 150mAhg<-1>, the capacity is about 110mAhg<-1> and a capacity retention rate is 90.2%.

Description

technical field [0001] The invention relates to a preparation method and application of graphite / Prussian blue composite material. Background technique [0002] Since the beginning of the 21st century, with the depletion of oil, coal mines and natural gas around the world, the problem of environmental pollution has become increasingly serious, and the demand for clean and renewable energy in human society has increased, making green secondary batteries attract much attention. The ideal future energy storage model is to use hydrogen fusion nuclear energy, solar energy, wind energy, and hydropower to generate electricity, and then the smart grid stores and transmits the electric energy to the city to supply life and produce energy needs; at the same time, new electric vehicles are gradually replacing traditional cars. To meet the needs of global transportation. In the process of energy storage and transportation, the battery as an energy storage device plays a very important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M4/36H01M4/583H01M4/62H01M4/525
CPCH01M4/36H01M4/525H01M4/583H01M4/62H01M10/054Y02E60/10
Inventor 韩建涛罗家还
Owner HUAZHONG UNIV OF SCI & TECH
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