A kind of composite sodium ion battery cathode material na 3 v 2 (po 4 ) 3 /c and its preparation method

A sodium-ion battery and composite material technology, which is applied in the field of preparation of sodium-ion battery cathode materials and Na3V23/C composite materials, can solve problems such as difficult to achieve theoretical capacity, poor conductivity, and poor rate performance, and achieve good cycle performance, Low-cost, easy-to-operate effect

Active Publication Date: 2020-06-02
临汾袤源新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Na 3 V 2 (PO 4 ) 3 The characteristics of poor conductivity make its rate performance very poor, and it is difficult to reach its theoretical capacity (117 mAh g -1 ), so it is necessary for Na 3 V 2 (PO 4 ) 3 Modification to improve its conductivity to improve its electrochemical performance

Method used

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  • A kind of composite sodium ion battery cathode material na <sub>3</sub> v <sub>2</sub> (po <sub>4</sub> ) <sub>3</sub> /c and its preparation method
  • A kind of composite sodium ion battery cathode material na <sub>3</sub> v <sub>2</sub> (po <sub>4</sub> ) <sub>3</sub> /c and its preparation method
  • A kind of composite sodium ion battery cathode material na <sub>3</sub> v <sub>2</sub> (po <sub>4</sub> ) <sub>3</sub> /c and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 3mmol of sodium carbonate, 2mmol of vanadium pentoxide, and 5mmol of hexamethylenetetramine and dissolve in a small beaker containing 20mL of deionized water, stir for 30min until it is fully dissolved; transfer the resulting mixed solution to a hydrothermal liner Add deionized water to 80% of the volume of the inner tank, then hydrothermally heat it in a blast oven at 120°C for 24 hours, and cool it naturally to obtain a mesophase liquid. Weigh 0.05g of citric acid and 6mmol of ammonium dihydrogen phosphate in a beaker containing 20mL of deionized water, stir for 20 minutes until it is fully dissolved, then slowly add the cooled mesophase liquid to the beaker, and stir after the addition is complete 30min to orange-yellow color. Then put the beaker in a 65°C blast oven for 36 hours until it is completely dry. The precursor powder obtained after drying was placed in a nitrogen atmosphere at 350°C for 4 hours and 750°C for 8 hours. Get Na after cooling 3 V 2 (PO 4...

Embodiment 2

[0022] Weigh 3mmol of sodium acetate, 2mmol of vanadium pentoxide, and 5mmol of hexamethylenetetramine in a small beaker containing 20mL of deionized water, stir for 30min until it is fully dissolved; transfer the resulting mixed solution to a hydrothermal liner Add deionized water to 80% of the volume of the inner tank, then hydrothermally heat it in a blast oven at 120°C for 24 hours, and cool it naturally to obtain a mesophase liquid. Weigh 0.05g glucose and 6mmol ammonium dihydrogen phosphate in a beaker containing 20mL deionized water, stir for 20min until it is fully dissolved, then slowly add the cooled mesophase liquid dropwise to the beaker, and stir for 30min after the addition is complete To the color is orange-yellow. Then put the beaker in a 65°C blast oven for 36 hours until it is completely dry. The precursor powder obtained after drying was placed in a nitrogen atmosphere at 350°C for 4 hours and 750°C for 8 hours. Get Na after cooling 3 V 2 (PO 4 ) 3 / C Compo...

Embodiment 3

[0024] Weigh 3mmol of sodium hydroxide, 2mmol of ammonium metavanadate, and 5mmol of hexamethylenetetramine in a small beaker containing 20mL of deionized water, and stir for 30min until it is fully dissolved; transfer the resulting mixed solution to the hydrothermal In the bladder, add deionized water to 80% of the volume of the inner bladder, and then hydrothermally heat it in a blast oven at 120°C for 24 hours and cool it naturally to obtain an intermediate liquid. Weigh 0.05g of sucrose and 6mmol of ammonium dihydrogen phosphate in a beaker containing 20mL of deionized water, stir for 20 minutes until it is fully dissolved, then slowly add the cooled mesophase liquid to the beaker, and stir for 30 minutes after the addition is complete To the color is orange-yellow. Then put the beaker in a 65°C blast oven for 36 hours until it is completely dry. The precursor powder obtained after drying was placed in a nitrogen atmosphere at 350°C for 4 hours and 750°C for 8 hours. Get ...

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Abstract

The invention provides a method for preparing a Na3V2(PO4)3 / C positive electrode material by introducing carbon to a liquid mesophase. The method includes a step of weighing a sodium source, a vanadium source and C6H<12>N4 into a small beaker, adding deionized water into the small beaker, stirring the mixture for 20 min until complete dissolution, transferring the liquid obtained into a hydrothermal liner, adding deionized water into the liner until the volume of the liquid is 80% of the volume of the hydrothermal liner, and performing a hydrothermal reaction in a blast drying oven having a temperature of 120-160 DEG C for 24-36 h; a step of weighing a phosphorus source and a carbon source into a beaker, adding deionized water into the beaker, and stirring the mixture for 20 min until complete dissolution; a step of slowly adding dropwise the naturally cooled mesophase liquid into the beaker containing the phosphorus source and the carbon source, and stirring the mixture for 20 min until the solution turns orange-yellow; a step of drying the beaker in a blast drying oven having a temperature of 65 DEG C for 24-36 h until a product is completely dried into powder; and a step of pre-sintering the obtained black green precursor powder at 350 DEG C in a nitrogen atmosphere for 4-6 h, calcinating the powder at 700-800 DEG C for 6-10 h, and naturally cooling the powder to obtain the Na3V2(PO4)3 / C composite material. The composite material shows good electrochemical properties when being adopted as a sodium ion battery positive electrode material.

Description

Technical field [0001] The invention relates to a type of high-performance sodium ion battery cathode material, in particular to a Na 3 V 2 (PO 4 ) 3 The preparation method of / C composite material belongs to the field of electrochemical power supply. [0002] technical background [0003] Lithium-ion batteries are widely used as power sources for portable electronic products, hybrid vehicles and pure power vehicles due to their high energy density, low self-discharge, no memory effect, and long cycle life. With the increasing demand for lithium-ion batteries in the market, the shortage of lithium resources has gradually become a fatal factor restricting the development of lithium-ion batteries. Therefore, finding new energy storage batteries has become a current research focus. Sodium and lithium are in the same main family and have similar physical and chemical properties. Compared with lithium resources, sodium resources are more abundant, widely distributed, and simple to extra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 倪世兵唐俊陈启长杨学林
Owner 临汾袤源新材料科技有限公司
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