Carbon-doped sodium vanadium phosphate cathode material as well as preparation method and application thereof

A cathode material and a technology of sodium vanadium phosphate, which are applied in the field of carbon-doped sodium vanadium phosphate cathode materials and their preparation, can solve the problem that the rate performance of synthetic materials needs to be further improved, and achieve the effect of enhancing heat and mass transfer effects.

Active Publication Date: 2018-03-27
东北大学秦皇岛分校
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this solution is that the rate performa

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  • Carbon-doped sodium vanadium phosphate cathode material as well as preparation method and application thereof
  • Carbon-doped sodium vanadium phosphate cathode material as well as preparation method and application thereof
  • Carbon-doped sodium vanadium phosphate cathode material as well as preparation method and application thereof

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Embodiment 1

[0082] This embodiment provides a method for preparing a carbon-doped sodium vanadium phosphate cathode material, and the specific preparation method is as follows:

[0083] (1) Weigh 1.262g citric acid, 2.07g ammonium dihydrogen phosphate, 1.404g ammonium metavanadate, 0.72g sodium hydroxide (element ratio Na:V:P=3:2:3, Na:C=1: 2) Dissolve them in 80 mL of deionized water in sequence, and stir to obtain a solution;

[0084] (2) After heating and stirring the solution in a water bath at 80°C until a blue sol is formed, it is transferred to an oven at 80°C and dried to obtain a dry gel;

[0085] (3) The dry gel is fully ground and sieved with a 200-mesh sieve to obtain the precursor, and the precursor is transferred to a tube furnace. In a nitrogen atmosphere, the first stage calcination temperature is 350°C, and calcination is 3h , Then heat up to 800℃ for the second stage of calcination temperature, calcine for 8h, and naturally cool down to obtain Na 3 V 2 (PO 4 ) 3 / C product.

[...

Embodiment 2

[0095] This embodiment provides a method for preparing a carbon-doped sodium vanadium phosphate cathode material, and the specific preparation method is as follows:

[0096] (1) Weigh 1.262g citric acid, 2.07g ammonium dihydrogen phosphate, 1.404g ammonium metavanadate, 0.72g sodium hydroxide (element ratio Na:V:P=3:2:3, Na:C=1: 2) Dissolve them in 80 mL of deionized water in sequence, and stir to obtain a solution;

[0097] (2) After heating and stirring the solution in a water bath at 80°C until a blue sol is formed, it is transferred to an oven at 80°C and dried to obtain a dry gel;

[0098] (3) The dry gel is fully ground and sieved using a 200-mesh sieve to obtain a precursor. The precursor is transferred to a tube furnace. In a nitrogen atmosphere, a calcination temperature is 350°C for 3 hours. Raise the temperature to 800℃ for the second stage of calcination temperature, calcine for 8h, and naturally cool down to obtain Na 3 V 2 (PO 4 ) 3 / C product.

[0099] (4) Weigh 4.5428...

Embodiment 3

[0108] For the specific method of this embodiment, refer to Embodiment 1, the difference is:

[0109] In step (1), the added amount of citric acid is 1.893g (element ratio Na:C=1:3);

[0110] In step (2), the heating temperature of the water bath is 70°C, and the drying temperature is 70°C;

[0111] In step (3), the first stage calcination temperature is 400°C, the calcination time is 2h, the second stage calcination temperature is 780°C, and the calcination time is 7h;

[0112] In step (4), adjust the pH of the buffer solution to 8.3, add 0.15g of dopamine hydrochloride, and the concentration of dopamine hydrochloride in the solution is 2mg / mL;

[0113] In step (5), the calcination temperature in the first stage is 300°C for 4 hours, and the calcination temperature in the second stage is 780°C for 5 hours.

[0114] In the carbon-doped sodium vanadium phosphate cathode material obtained in this embodiment, Na composed of sodium vanadium phosphate and the first carbon layer 3 V 2 (PO 4 ) ...

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Abstract

The invention discloses a carbon-doped sodium vanadium phosphate cathode material as well as a preparation method and application thereof. In the cathode material, Na3V2 (PO4)3/C composite particles formed by sodium vanadium phosphate and a first carbon layer is wrapped by a carbon network used as a second carbon layer. The preparation method of the cathode material comprises the following steps:(1) dissolving a carbon source, a phosphorus source, a vanadium source and a sodium source into water, and mixing to obtain a solution; (2) mixing and heating the solution, and drying to obtain driedgel; (3) carrying out two-stage calcination on the dried gel to obtain Na3V2 (PO4)3/C; (4) preparing a buffer solution with a pH value of 8.3-8.7, dispersing the Na3V2 (PO4)3/C and dopamine hydrochloride into the buffer solution, mixing, carrying out solid-liquid separation, and drying to obtain powder; (5) carrying out two-stage calcination on the obtained powder in argon atmosphere to obtain thecathode material. The cathode material has excellent electrochemical properties, and can be used for sodium-ion batteries.

Description

Technical field [0001] The invention belongs to the field of energy storage materials and technology, and specifically relates to a carbon-doped sodium vanadium phosphate cathode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in the portable electronic equipment market due to their high open circuit voltage, high energy density, long cycle life, environmental friendliness, etc. and have become the preferred energy source for new energy vehicles. With the development of lithium-ion batteries Widely used, the market demand for lithium resources has also greatly increased. However, the reserves of lithium in the earth's crust are only 0.0065%, and the distribution is uneven. The price of lithium resources is gradually rising and cannot meet the growing market demand, so the development reserves are abundant , Evenly distributed, inexpensive, environmentally friendly, and safe alternative resources have b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M10/054Y02E60/10
Inventor 罗绍华闫绳学刘欢刘颖颖于顺志祁鸿飞王庆王志远张亚辉刘延国郝爱民
Owner 东北大学秦皇岛分校
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