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Preparation method of high-performance sodium ion battery cathode material (VO)2P2O7 composite

A technology of sodium ion battery and composite material, which is applied in the field of high-performance sodium ion battery negative electrode material 2P2O7/C composite material, can solve the problems of poor cycle performance of negative electrode material, cumbersome synthesis process, complicated operation, etc., and achieves good electrochemical performance, Simple and easy-to-obtain raw materials, environmentally friendly results

Active Publication Date: 2017-10-17
ZAOZHUANG UNIV
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Problems solved by technology

[0003] Chinese patent document CN104505510A (application number: 201410765627.6) discloses a negative electrode material for a sodium ion secondary battery, which solves the problem of poor cycle performance of the negative electrode material of the existing sodium ion battery. The molecular formula of the material is Na 3 V 2 (PO 4 ) 3
In 2002, (VO) 2 P 2 o 7 The crystals are composed of mobile phase P 2 o 5 The preparation method from growth has been reported (Inorganic Chemistry, 2002, 41, 4664-4672), but in the synthesis process, it is necessary to strictly control the reaction atmosphere, pressure and temperature rise / fall rate, and the operation is cumbersome
[0005] In summary, the currently reported (VO) 2 P 2 o 7 Most of the synthesis methods need to take a long time (up to 49 days), the synthesis process is cumbersome, and the energy consumption is high.

Method used

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  • Preparation method of high-performance sodium ion battery cathode material (VO)2P2O7 composite
  • Preparation method of high-performance sodium ion battery cathode material (VO)2P2O7 composite
  • Preparation method of high-performance sodium ion battery cathode material (VO)2P2O7 composite

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Embodiment 1

[0034] Embodiment 1, (VO) 2 P 2 o 7 / C composite preparation

[0035] 10mmol V 2 o 5 ,20mmol NH 4 h 2 PO 4 ,Add 20mmol of methacrylic acid into a 25mL beaker, add 20mL of deionized water and stir evenly, place in a water bath at 80°C to stir and heat, add 1mL of 5% ammonium persulfate aqueous solution as an initiator under constant stirring, and continue to stir and heat for 2 hours until a viscous solid is formed. Transfer to a 100°C oven for drying for 5 hours, and grind to obtain a precursor powder. The final product can be obtained by heating the precursor powder to 600°C and calcining for 5 hours in an Ar atmosphere.

[0036] The product adopts Bruker D8 ADVANCE X-ray powder diffractometer to carry out phase analysis with Cu Kα ray (wavelength scanning step speed is 0.08 ° / second), the result is as follows figure 1 shown by figure 1 It can be seen that the final product is pure phase (VO) 2 P 2 o 7 / C complex, which can be used as an anode active material fo...

Embodiment 2

[0037] Embodiment 2, (VO) 2 P 2 o 7 / C composite preparation

[0038] 20mmol ammonium metavanadate, 20mmol NaH 2 PO 4 , add 25mmol methacrylic acid into a 25mL beaker, add 20mL deionized water and stir evenly, place in a water bath at 80°C for stirring and heating, add 1mL of 5% sodium persulfate aqueous solution as an initiator, continue stirring and heating for 1 hour until sticky A thick solid formed. Transfer to a 110°C oven for drying for 4 hours, and grind to obtain a precursor powder. Precursor powder in N 2 The final product can be obtained by calcining at 600°C for 6 hours in the atmosphere.

[0039] The product was subjected to phase analysis with Cu Kα rays (wavelength scan step speed of 0.08° / sec) using a Bruker D8 ADVANCE X-ray powder diffractometer, and the results showed that it was phase-pure (VO) 2 P 2 o 7 / C complex, can be used as the negative electrode active material of sodium ion battery.

Embodiment 3

[0040] Embodiment 3, (VO) 2 P 2 o 7 / C composite preparation

[0041] With 20mmol sodium metavanadate, 20mmol Na 2 HPO 4 , add 20mmol acrylic acid to a 25mL beaker, add 20mL deionized water and stir evenly, place in a 70°C water bath and stir and heat, add 1mL 5% mass concentration of sodium persulfate aqueous solution as an initiator, continue stirring and heating for 1 hour until viscous Solids are formed. Transfer to a 100°C oven for drying for 6 hours, and grind to obtain a precursor powder. Precursor powder in N 2 The final product can be obtained by calcining at 450°C for 8 hours in the atmosphere.

[0042] The product was subjected to phase analysis with Cu Kα rays (wavelength scan step speed of 0.08° / sec) using a Bruker D8 ADVANCE X-ray powder diffractometer, and the results showed that it was phase-pure (VO) 2 P 2 o 7 / C complex, can be used as the negative electrode active material of sodium ion battery.

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Abstract

The invention relates to a preparation method of a high-performance sodium ion battery cathode material (VO)2P2O7 composite. The preparation method includes: evenly stirring a vanadium source V, a phosphorus source P and a monomer polymer with water, heating in 70-95DEG C water bath, adding an initiator, transferring to an oven for drying 4-6 hours at 100-120DEG C and grinding to obtain precursor powder; placing the precursor powder in a tube furnace in the inert atmosphere, and gradually heating to 450-800DEG C for sintering for 4-8 hours to obtain the high-performance sodium ion battery cathode material (VO)2P2O7 composite. The raw materials adopted are easy to obtain, low in price, environment friendly and low in time and energy consumption, and high-volume low-cost production can be achieved; next calcination can be performed after pretreatment in the water bath at the lower temperature, and requirement on equipment is low; carbon-coating can be realized, and meanwhile, carbon thermal reduction is realized.

Description

technical field [0001] The invention relates to a high-performance sodium-ion battery negative electrode material (VO) 2 P 2 o 7 The / C composite material belongs to the technical field of electrochemistry and new energy materials. Background technique [0002] Lithium-ion batteries are widely used as energy storage devices in modern society. However, with the continuous expansion of the application field of lithium-ion batteries, lithium resources are getting less and less, and the price of lithium batteries is getting higher and higher, which seriously hinders its wider application range. Compared with lithium, sodium has much larger reserves, is widely distributed, and is very cheap. In addition, in terms of basic properties, sodium is very similar to lithium, the second lightest and smallest element, and its standard potential is also very low. Therefore, sodium-ion batteries are regarded by researchers as a new energy storage device that is expected to replace lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/054
CPCH01M4/366H01M4/48H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 黄薇曹楠李爱华
Owner ZAOZHUANG UNIV
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