A repair method of carbon composite vanadium phosphate

A remediation method and carbon composite technology, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve problems such as inefficient remediation methods, improve reusability and economic value, avoid waste water pollution, and crystal phase purity. high effect

Active Publication Date: 2022-05-13
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to propose a repair method for carbon composite vanadium phosphate, which can make Long-term placement in the air has effectively repaired and regenerated materials that have been oxidized and deteriorated. The repaired carbon-composite vanadium phosphate crystal structure has no impurity phases, and the crystal phase has no significant difference from that before deterioration, and the vanadium dissolution rate of the regenerated material has returned to a low level. At the level of 2000mg / kg

Method used

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  • A repair method of carbon composite vanadium phosphate
  • A repair method of carbon composite vanadium phosphate
  • A repair method of carbon composite vanadium phosphate

Examples

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Embodiment 1

[0045] This embodiment discloses a preparation and restoration method of carbon-composite vanadium phosphate. Include the following steps:

[0046] New Carbon Composite Vanadium Phosphate (VPO 4 / C-1): 45g of glucose monohydrate, 100g of vanadium pentoxide, and 33g of oxalic acid were added to 200mL aqueous solution in sequence, and mechanically stirred at 60°C for 30 minutes until the glucose was completely dissolved, and then the temperature was raised to 90°C. After the temperature stabilizes, slowly pour 145g of industrial phosphoric acid into the solution. After the solution forms a uniform dark green viscous liquid, transfer it to an oven and dry it at 110°C. Then the dried sample is crushed and calcined at a high temperature under the protection of nitrogen. , the calcination conditions are 500°C for 3h, 850°C for 3h, cooling to room temperature and crushing to obtain the new carbon-composite vanadium phosphate product 1.

[0047] In the example, in order to highlight...

Embodiment 2

[0055] This embodiment discloses a preparation and restoration method of carbon-composite vanadium phosphate. Include the following steps:

[0056] New Carbon Composite Vanadium Phosphate (VPO 4 / C-1): Add 30g of sucrose, 130g of ammonium metavanadate, and 50g of citric acid to 200mL of aqueous solution in sequence, mechanically stir at 70°C for 30 minutes, then raise the temperature to 93°C, and pour into the solution after the temperature stabilizes. Slowly pour 145g of industrial phosphoric acid into the solution, and after the solution forms a uniform blue viscous liquid, transfer it to an oven for drying at 110°C, then pulverize the dried sample and perform high-temperature calcination under the protection of nitrogen. The calcination condition is 500 Calcined at ℃ for 4 hours, and then calcined at 850℃ for 5 hours to obtain the new carbon-composite vanadium phosphate product 1.

[0057] Failed Carbon Composite Vanadium Phosphate (VPO 4 / C-2) The preparation method is ...

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Abstract

The invention provides a method for repairing carbon-composite vanadium phosphate, comprising the following steps: step 1, detecting the vanadium dissolution rate and element content of carbon-composite vanadium phosphate to be repaired, and judging whether the failure degree of carbon-composite vanadium phosphate and the ratio of element content are out of balance; step 2. Mix the coated reducing agent with the carbon composite vanadium phosphate to be repaired, the amount of the coated reducing agent is calculated according to the vanadium dissolution rate of the carbon composite vanadium phosphate to be repaired; step 3, the mixed material is treated at high temperature to obtain Repaired carbon composite vanadium phosphate. This repair method can effectively repair and regenerate materials that have been oxidized and deteriorated due to long-term placement in the air. The dissolution rate recovered to a level below 2000mg / kg.

Description

technical field [0001] The present invention relates to lithium-ion and sodium-ion battery material technology and restoration technology, in particular to a restoration method of carbon-composite vanadium phosphate. Background technique [0002] Vanadium Phosphate (VPO 4 ) as a vanadium compound is widely used in the synthesis of lithium-ion batteries and sodium-ion battery cathode materials, such as lithium vanadium phosphate (Li 3 V 2 P(O 4 ) 3 ), lithium vanadium fluorophosphate (LiVPO 4 F), sodium vanadium fluorophosphate (Na 3 V 2 (PO 4 ) 2 f 3 ), etc., have been extensively studied and reported. In practical application, vanadium phosphate is more combined with carbon to form carbon complex vanadium phosphate (VPO 4 / C), thereby improving the conductivity and stability of the material. [0003] However, the trivalent vanadium (Ⅲ) in vanadium phosphate will be slowly oxidized to tetravalent vanadium (IV) compounds in the air, resulting in the deterioration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37H01M4/58H01M10/0525H01M10/054
CPCC01B25/372H01M4/5825H01M10/0525H01M10/054Y02E60/10
Inventor 杜乃旭唐雨微李洋全成龙刘阳郭大源
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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