Vanadium phosphate sodium composite nano porous cathode material and method for preparing material by using freeze drying method

A composite cathode material, freeze-drying technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the limitations of the popularization and application of sodium vanadium phosphate composite cathode materials, high current charge and discharge performance and problems such as low rate performance, to achieve the effect of reducing polarization and battery internal resistance, facilitating wetting, and improving cycle performance

Inactive Publication Date: 2016-10-12
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively low high-current charge and discharge performance and rate performance of the existing sodium vanadium phosphate composite positive electrode material, thereby limiting the shortage of popularization and application of the sodium vanadium phosphate composite positive electrode material, and to provide a sodium vanadium phosphate composite Nanoporous positive electrode material and method for preparing the same using freeze-drying method

Method used

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  • Vanadium phosphate sodium composite nano porous cathode material and method for preparing material by using freeze drying method
  • Vanadium phosphate sodium composite nano porous cathode material and method for preparing material by using freeze drying method
  • Vanadium phosphate sodium composite nano porous cathode material and method for preparing material by using freeze drying method

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Embodiment 1

[0036]Accurately weigh 181.9 mg (1 mmol) of vanadium pentoxide, add it to a mixed solvent consisting of 5 mL of hydrogen peroxide and 50 mL of deionized water, stir and dissolve for 1 hour, then add 246.1 mg (3 mmol) of sodium acetate and 345.1 mg (3 mmol) of phosphoric acid Ammonium dihydrogen and 50 mg graphene oxide were stirred for 12 hours to obtain a mixed solution. Next, the mixed solution was placed in liquid nitrogen at -196°C for 30 minutes and frozen into a solid, and then vacuum-dried in a vacuum freeze dryer for 48 hours to obtain a sodium vanadium phosphate precursor. Finally, the freeze-dried precursor was placed in an atmosphere tube furnace and sintered at 750°C for 8 hours under a mixed gas atmosphere of argon and hydrogen (accounting for 5 wt% of the mixed gas) to obtain sodium vanadium phosphate / graphene Composite cathode material. Mix the sodium vanadium phosphate / composite material prepared in this example with carbon powder and binder in a weight ratio ...

Embodiment 2

[0043] Accurately weigh 23.4 mg (0.2 mmol) of ammonium metavanadate, add it into a mixed solvent composed of 1 mL of hydrogen peroxide and 50 mL of deionized water, stir and dissolve for 1 hour, then add 25.5 mg (0.3 mmol) of sodium nitrate, 29.4 mg (0.3 mmol) phosphoric acid and 4.6 mg carbon nanotubes, and continued stirring for 12 hours to obtain a mixed solution. Next, the mixed solution was placed in liquid nitrogen at -196°C for 30 minutes and frozen into a solid, and then vacuum-dried in a vacuum freeze dryer for 48 hours to obtain a sodium vanadium phosphate precursor. Finally, the freeze-dried precursor was placed in an atmosphere tube furnace and sintered at 700°C for 24 hours under a mixed gas atmosphere of argon and hydrogen (5wt%) to obtain a three-dimensional porous framework structure of sodium vanadium phosphate / carbon Nanotube composite cathode materials.

Embodiment 3

[0045] Accurately weigh 16.6g (200mmol) vanadium dioxide, add it into a mixed solvent composed of 50mL hydrogen peroxide and 50mL deionized water, stir and dissolve for 12 hours, then add 21.3g (150mmol) sodium sulfate, 29.4mg (0.3mmol) phosphoric acid Diammonium hydrogen and 22.8g sucrose were stirred for 24 hours to obtain a mixed solution. Next, the mixed solution was placed in liquid nitrogen at -196°C for 30 minutes and frozen into a solid, and then vacuum-dried in a vacuum freeze dryer for 48 hours to obtain a sodium vanadium phosphate precursor. Finally, the freeze-dried precursor was placed in an atmosphere tube furnace and sintered at 900°C for 6 hours under a mixed gas atmosphere of argon and hydrogen (5wt%) to obtain a three-dimensional porous framework structure of sodium vanadium phosphate / carbon Composite cathode material.

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Abstract

The invention discloses a vanadium phosphate sodium composite nano porous cathode material and a method for preparing the material by using a freeze drying method, which belong to the technical fields of a cell material and its preparation method. The method comprises the following steps: adding a certain amount of a vanadium source in a mixed solvent of deionized water and hydrogen peroxide, after stirring the materials and dissolving the materials, adding a sodium source, a phosphorus source and a carbon source with a stoichiometric ratio to form a mixing solution; then refrigerating the prepared mixing solution in liquid nitrogen to a solid, then performing vacuum drying on the material in a vacuum freeze drier; and finally putting a precursor obtained after freeze drying in mixing gas of argon and hydrogen for calcining to obtain the vanadium phosphate sodium composite nano porous cathode material. The prepared vanadium phosphate sodium composite nano porous cathode material has a three-dimensional porous structure and large specific surface area, and thereby is in favor of infiltration and transmission of an electrolyte, active sites of an electrochemical reaction are multiple, and high specific capacity and good multiplying power performance can be displayed.

Description

technical field [0001] The invention belongs to the technical field of battery materials and preparation methods thereof, and more specifically relates to a sodium vanadium phosphate composite nanoporous positive electrode material and a method for preparing the material by a freeze-drying method. Background technique [0002] With the rapid development of the economy and the continuous increase of energy consumption, traditional fossil energy is unsustainable, facing more and more resource constraints, and environmental pressure is also increasing. Therefore, in the face of the new situation, new energy, as a renewable and non-polluting alternative energy, will promote the sustainable development of the economy and alleviate the increasing energy pressure. Moreover, as the industry's demand for new energy continues to rise, seeking new energy storage devices has become a top priority in the field of new energy. Lithium-ion batteries have become an ideal power source for po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/139B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/139H01M4/366H01M4/5825H01M4/583Y02E60/10
Inventor 芮先宏张香华成城陈光徐进良孙运兰朱宝忠
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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