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A preparing method of a sodium ion battery cathode material Na3V2(PO4)3/C

A technology for sodium ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor ion conductivity, high cost, and complicated steps, achieve uniform particles, avoid material agglomeration, and save steps when the effect

Active Publication Date: 2016-08-31
浙江钠创新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ionic conductivity of this material is poor, and it is necessary to improve the conductivity by encapsulating carbon or other modification methods.
In the existing literature and patents, some studies use graphene, carbon nanotubes, etc. as raw materials to prepare Na 3 V 2 (PO 4 ) 3 Materials, some studies have improved the performance of the material through subsequent CVD carbon coating, and some studies have used high-energy ball milling when mixing raw materials, which has the disadvantage of high cost and complicated steps

Method used

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  • A preparing method of a sodium ion battery cathode material Na3V2(PO4)3/C
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  • A preparing method of a sodium ion battery cathode material Na3V2(PO4)3/C

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Embodiment 1

[0031] Weigh 2.5mmol V 2 o 5 , 3.75 mmol Na 2 CO 3 , 7.5mmol NH 4 h 2 PO 4 , 3.75mmol citric acid and 0.8mmol PVP were dissolved in 120ml deionized water, and stirred evenly; the above solution was heated and stirred at 80°C for 8h, evaporated to form a sol, transferred to a petri dish, freeze-dried at -55°C for 7h, and ground get the precursor.

[0032] Place the above precursors in a mixed gas of hydrogen and argon (5% H 2 (v / v)) in a tube furnace, pre-calcined at 350 °C for 4 h, calcined at 800 °C for 12 h, and naturally cooled to obtain Na 3 V 2 (PO 4 ) 3 / C material.

[0033] Depend on Figure 1~5 It can be seen that: Na 3 V 2 (PO 4 ) 3 The / C material has uniform particles, the particle size is between 1 and 2 μm, and the carbon content of the material is 3%. The material is used as a positive electrode material, acetylene black is used as a conductive agent, and PVDF is used as a binder to prepare a pole piece, wherein the mass ratio of active material:...

Embodiment 2

[0035] Weigh 2.5mmol V 2 o 5 , 7.5mmol NaOH, 7.5mmol NH 4 h 2 PO 4 , 2mmol ascorbic acid, 1mmol oxalic acid and 0.5mmol PEG were dissolved in 120ml deionized water, and stirred evenly; the above solution was heated and stirred at 70°C for 14h, evaporated to form a sol, transferred to a petri dish, and freeze-dried at -45°C for 12h. Grinding to obtain the precursor.

[0036] The above precursors were placed in an argon atmosphere tube furnace, pre-calcined at 400 °C for 3 h, calcined at 700 °C for 16 h, and naturally cooled to obtain Na 3 V 2 (PO 4 ) 3 / C material.

[0037] Na prepared in this example 3 V 2 (PO 4 ) 3 The particle size of the / C material is between 2 and 5 μm, and the carbon content of the material is 2.3%. The material is used as a positive electrode material, acetylene black is used as a conductive agent, and PVDF is used as a binder to prepare a pole piece, wherein the mass ratio of active material: conductive agent: binder is 70:20:10. A battery ...

Embodiment 3

[0039] Weigh 5mmol NH 4 VO 3 , 7.5mmol NaH 2 PO 4 , 5mmol sucrose and 1mmol CTAB were dissolved in 120ml deionized water, and stirred evenly; the above solution was heated and stirred at 75°C for 12h, evaporated to form a sol, transferred to a petri dish, freeze-dried at -50°C for 10h, and ground to obtain the precursor .

[0040] The above precursors were placed in a nitrogen atmosphere tube furnace, pre-calcined at 400 °C for 4 h, calcined at 850 °C for 8 h, and naturally cooled to obtain Na 3 V 2 (PO 4 ) 3 / C material.

[0041] Na prepared in this example 3 V 2 (PO 4 ) 3 The / C material has uniform particles, the particle size is between 1 and 3 μm, and the carbon content of the material is 4.6%. The material is used as a positive electrode material, acetylene black is used as a conductive agent, and PVDF is used as a binder to prepare a pole piece, wherein the mass ratio of active material: conductive agent: binder is 70:20:10. The battery is assembled with th...

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Abstract

A preparing method of a sodium ion battery cathode material Na3V2(PO4)3 / C is disclosed. The method includes 1) weighing a vanadium source, a sodium source, a phosphor source, a carbon source and a surfactant, dissolving into deionized water at the same time, and fully stirring to obtain a solution A, 2) heating and stirring the solution A, concentrating into sol, transferring the sol to a culture dish, freeze-drying at a temperature ranging from -40 DEG C to -55 DEG C for 5-12 h, and grinding to obtain a precursor, and 3) putting the precursor into a tube furnace with inert gas, pre-sintering at 300-400 DGE C for 3-5 h, heating to 700-850 DEG C, sintering for 8-24 h, and naturally cooling to obtain the Na3V2(PO4)3 / C material. The method is simple and time-saving in steps. The prepared Na3V2(PO4)3 / C material is uniform in particles, high in specific discharge capacity and good in rate capacity and cyclic performance.

Description

technical field [0001] The present invention relates to a kind of preparation method of the positive electrode material of sodium ion battery, relate in particular to a kind of positive electrode material of sodium ion battery Na 3 V 2 (PO 4 ) 3 / C preparation method. Background technique [0002] Economic development and social progress are inseparable from energy consumption. At present, most of the energy that dominates people's normal production and life is non-renewable energy, and the total amount of such energy is continuously decreasing. In response to the energy crisis, the development of alternative energy sources with low prices and abundant reserves has received widespread attention. Wind energy and solar energy are clean and efficient energy sources, but their power supply is greatly affected by the climate, the energy supply is discontinuous, and they cannot be directly connected to the grid. Therefore, it is necessary to develop an energy storage system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 王振波郑丽丽薛原玉富达刘宝生
Owner 浙江钠创新能源有限公司
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