Preparation method for sodium ion battery positive electrode material doped with modified sodium vanadium phosphate

A sodium ion battery, sodium vanadium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex process requirements, complex processes, increased processes, etc., and achieve simple processes, abundant raw material sources, and low cost. Effect

Inactive Publication Date: 2018-04-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

In recent years, different methods have been reported at home and abroad to synthesize modified Na 3 V 2 (PO 4 ) 3 Materials, electrospinning and carbon coating can effectively modify the large-rate performance; however, the former process requires complex equipment and low yield, and the latter increases the process, making the process complicated

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  • Preparation method for sodium ion battery positive electrode material doped with modified sodium vanadium phosphate
  • Preparation method for sodium ion battery positive electrode material doped with modified sodium vanadium phosphate
  • Preparation method for sodium ion battery positive electrode material doped with modified sodium vanadium phosphate

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[0031] A preparation method of a sodium ion battery positive electrode material doped with modified sodium vanadium phosphate, comprising the following steps:

[0032] Step S1: Preparation of precursors: mixing sodium-containing raw materials, vanadium-containing raw materials, phosphoric acid-containing raw materials, M doping element compounds, organic carbon materials and solvents to form a slurry, and drying the slurry to obtain Precursor; Wherein, the doping element M is Ti or Mo;

[0033] Step S2: Sintering preparation of the product: placing the precursor at a temperature of 750° C. to 900° C. for heat treatment to obtain a sodium ion battery cathode material doped with modified sodium vanadium phosphate. In the present embodiment, the valence of Na is +1 valence, the valence of V is +3 valence, PO 4 The valence is -3.

[0034] The present invention prepares the doped modified sodium vanadium phosphate through the overall coordination of the precursor preparation step...

Embodiment 1

[0064] Embodiment one, a kind of preparation method of the positive electrode material of the sodium ion battery of doping modified sodium vanadium phosphate, comprises the following steps:

[0065] Step S1: Preparation of the precursor: Add 0.8189g of sodium carbonate, 0.91g of vanadium pentoxide and 1.7255g of ammonium dihydrogen phosphate into a nylon tube, add 0.2g of glucose and a small amount of absolute ethanol to form a slurry, and wet grind the slurry Dry it into powder after 30 minutes to obtain the precursor;

[0066] Step S2: Sintering of the product: put the precursor in the ark and transfer it to a tube furnace, and in an argon-hydrogen mixed gas reducing atmosphere, raise the temperature to 600°C at 3°C / min, keep it warm for 6h, and raise the temperature to 800°C at 3°C / min °C, keep warm for 10 hours to obtain the anode material of sodium ion battery without modified heterovanadium sodium phosphate.

Embodiment 2

[0067] Embodiment two, a kind of preparation method of the positive electrode material of the sodium ion battery of doping modified sodium vanadium phosphate, comprises the following steps:

[0068] Step S1: Preparation of the precursor: Add 0.8189g sodium carbonate, 0.91g vanadium pentoxide, 0.02g titanium dioxide and 1.7255g ammonium dihydrogen phosphate into the nylon tube, add 0.2g glucose and a small amount of absolute ethanol to form a slurry, Wet grind the slurry for 30 minutes and then dry it into powder to obtain the precursor;

[0069] Step S2: Sintering of the product: put the precursor in the ark and transfer it to a tube furnace, and in an argon-hydrogen mixed gas reducing atmosphere, raise the temperature to 600°C at 3°C / min, keep it warm for 6h, and raise the temperature to 800°C at 3°C / min ℃, heat preservation for 10h, to obtain a titanium-doped sodium vanadium phosphate positive electrode material for a sodium ion battery.

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Abstract

The invention relates to a preparation method for a sodium ion battery positive electrode material doped with modified sodium vanadium phosphate. The preparation method comprises the following steps of S1, precursor preparation, in which a sodium-containing raw material, a vanadium-containing raw material, a phosphate-containing raw material, an M doping element compound, an organic carbon material and a solvent are mixed and baked to prepare a precursor, wherein a doping element M is Ti or Mo; and S2, product sintering and preparation, in which the precursor is placed under a temperature of 750-900 DEG C for thermal processing to obtain a target product. By integral matching of the precursor preparation step and the product sintering and preparation step and by improving a precursor processing technology and a sintering technology, the product with a stable structure, high grain purity and uniform grain size is finally obtained, the prepared positive electrode material product doped with the modified sodium vanadium phosphate has favorable electrical property and favorable rate performance effect, and the preparation method is simple in process, low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a sodium ion battery cathode material doped with modified sodium vanadium phosphate. Background technique [0002] With the deterioration of fossil energy and environmental problems, the importance of green energy is more significant. This puts forward more demands on secondary energy. As a high-performance secondary green battery, sodium-ion secondary batteries have been widely used in various portable power sources and electric vehicles. NASICON structure sodium ion battery cathode material Na 3 V 2 (PO 4 ) 3 With the advantages of abundant raw material resources, low price, environmental friendliness, excellent stability and cycle performance, it is an important substitute for the cathode material of sodium ion batteries. [0003] However, the diffusion rate of sodium ions in this electrode material is low, Na 3 V 2 (PO 4 ) 3 Poor ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/5825H01M10/054Y02E60/10
Inventor 韩建涛李翔
Owner HUAZHONG UNIV OF SCI & TECH
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