Preparation method of sodium ion battery based on graphite/prussian blue anode material

A technology of sodium ion battery and Prussian blue, which is applied in the field of preparation of sodium ion battery, can solve the problems such as capacity stability to be improved, and achieve the effects of improving electrochemical performance, increasing discharge voltage and reducing charging voltage

Inactive Publication Date: 2017-08-11
DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the above prior art, it can be known that Prussian blue and its derivative materials have been applied in the battery field, but the stability of the capacity of the electrode material based on Prussian blue still needs to be improved.

Method used

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  • Preparation method of sodium ion battery based on graphite/prussian blue anode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve 4mmol of ferrous chloride in 100ml of deionized water, add 50mg of surfactant F127, and ultrasonically stir until clear liquid is recorded as solution A, dissolve 2mmol of sodium ferrocyanide in 100ml of deionized water , ultrasonically stirred to a clear solution, which was recorded as solution B.

[0028] (2) Transfer solution A and solution B to the reaction kettle, tighten the lid of the kettle and transfer to the oven, first program the temperature to 70°C, the heating rate is 1°C / min, react for 10h, and then lower the temperature at 0.1°C / min Cool down to room temperature with a rate program, first use deionized water to wash twice at a rate of 5000rpm, and then use methanol to wash once at a rate of 5000rpm, and vacuum-dry at 110°C for 5h to obtain Prussian blue nanospheres with a particle size of 400nm. .

[0029] (3) Add 200mg of Prussian blue nanospheres to 150ml of 10% graphite oxide solution, stir at room temperature for 4 hours to obtain graph...

Embodiment 2

[0033] (1) Dissolve 5mmol of ferrous chloride in 100ml of deionized water, add 50mg of surfactant F127, and ultrasonically stir until the clear liquid is recorded as solution A, dissolve 2.5mmol of sodium ferrocyanide in 100ml of deionized water In water, ultrasonically stirred to a clear liquid, which was recorded as solution B.

[0034](2) Transfer solution A and solution B to the reaction kettle, tighten the lid of the kettle and transfer to the oven, first program the temperature to 84°C, the heating rate is 1.3°C / min, react for 12.6h, and then 0.4°C / min The cooling rate program lowered the temperature to room temperature, first centrifuged washing with deionized water at a rate of 5000rpm for three times, and then with methanol for one time at a rate of 5000rpm, and vacuum dried at 113.4°C for 12h to obtain Prussian blue nanoparticles with a particle size of 320nm. ball.

[0035] (3) Add 200 mg of Prussian blue nanospheres to 150 ml of a 40% graphite oxide solution, stir...

Embodiment 3

[0039] (1) Dissolve 6mmol of ferrous chloride in 100ml of deionized water, add 50mg of surfactant F127, and ultrasonically stir until clear liquid is recorded as solution A, dissolve 3mmol of sodium ferrocyanide in 100ml of deionized water , ultrasonically stirred to a clear solution, which was recorded as solution B.

[0040] (2) Transfer solution A and solution B to the reaction kettle, tighten the lid of the kettle and transfer to the oven, first program the temperature to 84.6°C, the heating rate is 1.6°C / min, react for 15.1h, and then 0.7°C / min The temperature was lowered to room temperature with a program of cooling rate, and the deionized water was used to wash twice at a rate of 5000rpm, and then washed once with methanol at a rate of 5000rpm, and then vacuum-dried at 115.7°C for 10h to obtain Prussian blue nanoparticles with a particle size of 200nm. ball.

[0041] (3) Add 200 mg of Prussian blue nanospheres to 150 ml of a 20% graphite oxide solution, stir at room te...

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Abstract

The invention provides a preparation method of a sodium ion battery based on a graphite / prussian blue anode material. The preparation method comprises the specific steps of mixing a ferrous chloride solution and a sodium ferrocyanide solution, performing programmed heating to be 70-90 DEG C, performing programmed cooling to be a room temperature, performing washing and drying to obtain a prussian blue nanosphere, adding the prussian blue nanosphere to a graphite oxide solution, performing stirring and mixing, performing separation, cold quenching and freeze-drying to obtain a graphite oxide cladded prussian blue nanosphere, performing reduction in hydrazine hydrate to obtain graphite / prussian blue, performing grinding, vacuum drying and tabletting on the graphite / prussian blue, a conductive agent, isopropanol and polytetrafluoroethylene to serve as an anode, taking a metal sodium sheet as a cathode, taking NaClO4 as an electrolyte, taking a chitosan film as a membrane, and then performing assembling in an argon atmosphere to form the sodium ion battery based on the graphite / prussian blue. The sodium ion battery prepared by the method has stable cycle performance; and a capacity maintenance rate is above 90%.

Description

technical field [0001] The invention belongs to the technical field of sodium ion battery materials, and in particular relates to a preparation method of a sodium ion battery based on graphite / Prussian blue positive electrode material. Background technique [0002] With the gradual scarcity of traditional fossil energy and increasingly serious environmental problems, the development of new renewable energy has become an inevitable trend. Renewable energy also places higher demands on the highest performance of energy storage technologies. The performance of energy storage medium in terms of energy density and power density is very important in energy storage technology. At present, lithium batteries and sodium batteries are developing rapidly. Metallic sodium and lithium are the same subject element. The standard electrode potential of Na / Na+ is -2.71V, which is close to the standard electrode potential of Li / Li+ -3.04V. The working principle of sodium ion battery is the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/58H01M10/054H01M10/058H01M50/409
CPCH01M4/58H01M10/054H01M10/058H01M50/409Y02E60/10Y02P70/50
Inventor 王海燕
Owner DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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