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A kind of preparation method of carbon-coated sodium vanadium phosphate composite cathode material

A technology of carbon-coated sodium vanadium phosphate and composite cathode materials, which is applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of difficulty in guaranteeing reproducibility, difficulty in large-scale production, and troublesome post-processing, and achieve consistency Good, uniform particle size, good dispersion effect

Active Publication Date: 2021-12-10
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem that in the prior art, in the preparation process of the sodium vanadium phosphate composite positive electrode material, the ball milling method not only consumes a lot of energy, but also inevitably wastes and leaks materials during the preparation and material transfer process, and is not environmentally friendly. defects, and when the sol-gel method is used to prepare, the reproducibility is difficult to guarantee, the time-consuming is long, the post-processing is troublesome, and the defects that are difficult to scale production provide a method for preparing a carbon-coated sodium vanadium phosphate composite positive electrode material

Method used

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  • A kind of preparation method of carbon-coated sodium vanadium phosphate composite cathode material
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  • A kind of preparation method of carbon-coated sodium vanadium phosphate composite cathode material

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Embodiment 1

[0051] A method for preparing a carbon-coated sodium vanadium phosphate composite cathode material, specifically comprising the following steps:

[0052] 1) Weigh 17.5467g of ammonium metavanadate, add 500mL of deionized water, heat to dissolve (the heating temperature is generally above 90°C), and obtain an aqueous solution containing vanadium source (wherein, the concentration of vanadium source is 0.2mol / L); then add 25.8818g ammonium dihydrogen phosphate, stirred and reacted in an oil bath at 90°C for 10 minutes to obtain reaction solution A; the pH value of reaction solution A was 4;

[0053] 2) Add 11.9239g of sodium carbonate to the reaction solution A for mixed reaction, the temperature of the mixed reaction is 88°C, and the mixed reaction time is 10min, until the solution no longer produces carbon dioxide bubbles, the reaction solution B is obtained; the pH of the reaction solution B is 7.5;

[0054] In the reaction solution B, the molar ratio of sodium atom, vanadiu...

Embodiment 2

[0059] A method for preparing a carbon-coated sodium vanadium phosphate composite cathode material, specifically comprising the following steps:

[0060] 1) Weigh 17.55g of ammonium metavanadate, add 500mL of deionized water, heat to dissolve (heating temperature is above 90°C), and obtain an aqueous solution containing vanadium source (wherein, the concentration of vanadium source is 0.2mol / L); then add 27.125 g of sodium dihydrogen phosphate, stirred and reacted in an oil bath at 95°C for 10 minutes to obtain reaction solution A; the pH value of reaction solution A was 5;

[0061] In reaction solution A, the molar ratio of sodium atom, vanadium atom and phosphorus atom is 3:2:3;

[0062] 2) Keeping this temperature, add 9.4g sucrose to the reaction solution A, the temperature of the mixing reaction is 90°C, and the time is 60min, until the solution turns dark green and the color does not change anymore. After the reaction is completed, the temperature is naturally lowered t...

Embodiment 3

[0066] 1) Weigh 17.5467g of ammonium metavanadate, add 500mL of deionized water, heat and dissolve at 95°C to obtain an aqueous solution with a concentration of 0.2mol / L; then add 25.8818g of ammonium dihydrogen phosphate, and stir for 10 minutes in an oil bath at 90°C. Obtain reaction solution A; The pH value of reaction solution A is 4;

[0067] 2) Add 11.9239g of sodium carbonate to the reaction solution A for mixed reaction, the temperature of the mixed reaction is 88°C, and the mixed reaction time is 10min, until the solution no longer produces carbon dioxide bubbles, the reaction solution B is obtained; the pH of the reaction solution B is 7.5;

[0068] In the reaction solution B, the molar ratio of sodium atom, vanadium atom and phosphorus atom is 3:2:3;

[0069] 3) Keeping this temperature, add 18.88g of glucose to the reaction solution B, the temperature of the mixed reaction is 90°C, and the time is 70min, until the solution turns dark green and the color does not c...

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Abstract

The invention discloses a method for preparing a carbon-coated sodium vanadium phosphate composite positive electrode material, which comprises the following steps: (1) an aqueous solution containing a vanadium source and a phosphorus source are mixed and reacted to obtain a reaction solution A; (2) the material is mixed with a reducing sugar After the reaction, reaction solution C is obtained; when the phosphorus source does not contain sodium atoms, the material is obtained after the reaction solution A and the sodium source are mixed and reacted; when the phosphorus source simultaneously contains sodium atoms, the material is reaction solution A; 3. reaction solution C It is obtained after spray drying and calcination. In the preparation process of the invention, traditional long-time high-temperature calcination in the later stage is not required, energy consumption is significantly reduced, and large-scale production is easy to be realized; It has good cycle stability, improves the electrochemical performance and energy density of the battery, is conducive to the practical development of sodium-ion batteries, can be suitable for commercial large-scale production, and has broad application prospects in the field of large-scale and high-power battery energy storage.

Description

technical field [0001] The invention relates to the technical field of secondary battery electrode materials, in particular to a method for preparing a carbon-coated sodium vanadium phosphate composite positive electrode material. Background technique [0002] At present, large-scale energy storage represented by smart grid has put forward higher requirements for energy storage technology, and the secondary battery system used in the field of large-scale energy storage is in urgent need of development. Due to its special application scenarios, it is required to have the characteristics of green environmental protection, low cost, safety and reliability, and long life, while taking into account the requirements of electrochemical performance indicators such as energy density, power density, and rate performance. Therefore, developing an energy storage battery system that can meet these requirements is a major technical challenge in the field of materials and energy. The sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 马紫峰崔桂嘉车海英王红
Owner 浙江钠创新能源有限公司
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