Preparation method of three-dimensional porous vanadium phosphate sodium / carbon anode material

A sodium vanadium phosphate, three-dimensional porous technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of unpredictability of renewable energy, haze invasion of ecology, environmental pollution, etc., and achieve capacity utilization and rate performance. Less than ideal, the effect of improving reversible capacity and improving transmission efficiency

Inactive Publication Date: 2016-09-07
MAANSHAN YUCHI NEW ENERGY MATERIALS CO LTD
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  • Application Information

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Problems solved by technology

[0002] Due to the excessive exploitation and use of traditional fossil energy, it has caused a series of problems such as environmental pollution, smog invasion, and ecological imbalance. In order to promote the sustainable development strategy and realize the peaceful coexistence between man and nature, countries have begun to vigorously develop renewable energy. We are curr

Method used

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  • Preparation method of three-dimensional porous vanadium phosphate sodium / carbon anode material
  • Preparation method of three-dimensional porous vanadium phosphate sodium / carbon anode material
  • Preparation method of three-dimensional porous vanadium phosphate sodium / carbon anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 182mg (1mmol) V 2 o 5 , was added to 30 mL of deionized water, and then 2 mL of H 2 o 2 Let it dissolve. Next, weigh 294mg (1mmol) sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O), 345 mg (3 mmol) NH 4 h 2 PO 4 and 136.8mg citric acid (C 6 h 8 o 7 ) into the above solution, and after it was completely dissolved, it was poured into a stainless steel reactor lined with polytetrafluoroethylene, and reacted at 180°C for 6 hours. After the reaction was completed, the gel precursor was taken out and dried for 12 hours. Finally, the dry gel precursor was calcined at 750° C. for 8 h in a mixed gas of argon-hydrogen (5%) to obtain a three-dimensional porous sodium vanadium phosphate / carbon composite positive electrode material. The argon-hydrogen (5%) The mixed gas means that the volume fraction of hydrogen in the mixed gas is 5vol.%.

[0026] figure 1 It is a three-dimensional physical photo of the product obtained in Example 1, and the pore structure can be clea...

Embodiment 2

[0033] Weigh 234mg (2mmol) ammonium metavanadate (NH 4 VO 3 ), added to 50mL deionized water, and then added 5mL H 2 o 2 Let it dissolve. Next, weigh 246mg (3mmol) sodium acetate (CH 3 COONa), 294mg (3mmol) H 3 PO 4 and 228mg of polyvinylpyrrolidone were added to the above solution, and after it was completely dissolved, it was poured into a stainless steel reactor lined with polytetrafluoroethylene, and reacted at 220°C for 2h. After the reaction was completed, the gel precursor was taken out and dried for 12 hours. Finally, the dry gel precursor was calcined at 750° C. for 8 h in a mixed gas of argon-hydrogen (5%) to obtain a three-dimensional porous sodium vanadium phosphate / carbon composite cathode material.

Embodiment 3

[0035] Weigh 150mg (1mmol) V 2 o 3, was added to 10 mL of deionized water, and then 1 mL of H 2 o 2 Let it dissolve. Next, weigh 201mg (1.5mmol) sodium oxalate (Na2C 2 o 4 ), 609mg (3mmol) ammonium phosphate ((NH 4 ) 3 PO 4 ) and 45.6 mg of polyethylene glycol 400 were added to the above solution, and after it was completely dissolved, it was poured into a stainless steel reactor lined with polytetrafluoroethylene, and reacted at 140 ° C for 12 hours. After the reaction was completed, the gel precursor was taken out and dried for 12 hours. Finally, the dry gel precursor was calcined at 750° C. for 8 h in a mixed gas of argon-hydrogen (5%) to obtain a three-dimensional porous sodium vanadium phosphate / carbon composite cathode material.

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Abstract

The present invention relates to the technical field of battery materials, and in particular relates to a preparation method of a three-dimensional porous vanadium phosphate sodium / carbon anode material. The method comprises the following steps: (1), dissolving a weighed vanadium source in a mixed solvent of deionized water and hydrogen peroxide, adding a sodium source, a phosphorus source and an organic complex until complete dissolution, pouring the reaction products in a reaction kettle for a hydrothermal reaction, wherein the molar ratio of Na:V:P is 3:2:3; and (2), after the hydrothermal reaction, drying the obtained three-dimensional precursor and then calcining in a gas mixture of argon and hydrogen (5%) at the temperature of 750 DEG C for 8h. The vanadium phosphate sodium / carbon composite material prepared by the invention has carbon coating to improve the electronic conductivity; and the three-dimensional structure porous structure improves the transmission efficiency of sodium ions between the electrode and the electrolyte, and plays a buffer role for deformation of sodium ions in the deintercalation process, and eventually greatly improves the cycle performance and rate performance of the material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a three-dimensional porous sodium vanadium phosphate / carbon cathode material. Background technique [0002] Due to the excessive exploitation and use of traditional fossil energy, it has caused a series of problems such as environmental pollution, smog invasion, and ecological imbalance. In order to promote the sustainable development strategy and realize the peaceful coexistence between man and nature, countries have begun to vigorously develop renewable energy. We are currently facing more serious environmental problems, so we pay more attention to the application of renewable energy. However, the intermittent and unpredictability of renewable energy makes it necessary for us to develop more effective and low-cost energy storage devices. Whether it is in electronic products, electric vehicles or large-scale smart grids, energy devices are widely...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/583H01M4/139
CPCH01M4/139H01M4/366H01M4/5825H01M4/583Y02E60/10
Inventor 芮先宏成城
Owner MAANSHAN YUCHI NEW ENERGY MATERIALS CO LTD
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