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Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery

A sodium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low conductivity, achieve uniform phase, high purity, and improve electron/ion diffusion kinetics

Active Publication Date: 2018-05-01
湖南钠邦新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Na 3 V 2 (PO 4 ) 3 The conductivity is low, and its voltage platform is 3.4V, which still needs to be improved

Method used

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  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery
  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery
  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Take 0.04mol sodium acetate, 0.005mol ferrous oxalate, 0.005mol manganese acetate, 0.01mol ammonium metavanadate and 0.03mol ammonium dihydrogen phosphate and dissolve them in 150mL deionized water, and add 60mL tetraethylene glycol and ethylene glycol (volume ratio 1 : 1) the mixed solution was stirred at room temperature for 1 h to obtain a mixed solution. Then the obtained mixed solution was transferred to a reaction kettle, reacted at 180° C. for 10 h to obtain a viscous colloid, and then freeze-dried the viscous colloid to obtain a precursor powder. Then the precursor powder was calcined at 750 °C for 8 h in an argon atmosphere to obtain Na 4 Fe 0.5 mn 0.5 V(PO 4 ) 3 Cathode material for sodium ion batteries.

[0044] The produced Na 4 Fe 0.5 mn 0.5 V(PO 4 ) 3 The morphology (SEM) of the positive electrode material is shown in figure 1 ,Depend on figure 1 It can be seen that it is an irregular sheet structure. figure 2 for the resulting Na 4 Fe 0.5 ...

Embodiment 2

[0046] Take 0.04mol sodium acetate, 0.005mol ferrous oxalate, 0.005mol manganese acetate, 0.01mol ammonium metavanadate and 0.03mol ammonium dihydrogen phosphate in 100mL deionized water, and add 60mL tetraethylene glycol and ethylene glycol (volume ratio 1: 1) The mixed solution was stirred at room temperature for 1 h to obtain a mixed solution. Then the obtained mixed solution was transferred to a reaction kettle, reacted at 180° C. for 10 h to obtain a viscous colloid, and then freeze-dried the viscous colloid to obtain a precursor powder. The precursor powder was then calcined at 750 °C for 8 h under an argon atmosphere to obtain Na 4 Fe 0.5 mn 0.5 V(PO 4 ) 3 Cathode materials for sodium ion batteries. It is a trigonal crystal system, the space group is R-3c, and the phase is uniform.

[0047] Na prepared by this embodiment 4 Fe 0.5 mn 0.5 V(PO 4 ) 3 The positive electrode material of the sodium ion battery and the sodium sheet are assembled into a button batter...

Embodiment 3

[0049] Take 0.04mol sodium acetate, 0.005mol ferrous oxalate, 0.005mol manganese acetate, 0.01mol ammonium metavanadate and 0.03mol ammonium dihydrogen phosphate in 200mL deionized water, and add 60mL tetraethylene glycol and ethylene glycol (volume ratio 1: 1) The mixed solution was stirred at room temperature for 1 h to obtain a mixed solution. Then the obtained mixed solution was transferred to a reaction kettle, and reacted at 180° C. for 10 h to obtain a viscous colloid, and then the viscous colloid was freeze-dried to obtain a precursor powder. The precursor powder was then calcined at 750 °C for 8 h under an argon atmosphere to obtain Na 4 Fe 0.5 mn 0.5 V(PO 4 ) 3 Cathode materials for sodium ion batteries. It is a trigonal crystal system, the space group is R-3c, and the phase is uniform.

[0050] Na prepared by this embodiment 4 Fe 0.5 mn 0.5 V(PO 4 ) 3 The positive electrode material of the sodium ion battery and the sodium sheet are assembled into a butto...

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Abstract

The invention discloses a sodium ion battery positive electrode material. The molecular formula of the sodium ion battery positive electrode material is Na<4>Fe<0.5>Mn<0.5>V(PO<4>)<3>, is a trigonal system and is an irregularly-shaped sheet structure, and the space group is R-3c. The invention also discloses a preparation method of the sodium ion battery positive electrode material. The preparation method comprises the steps of dissolving a sodium source, an iron source, a manganese source, a vanadium source and a phosphate source in deionized water according to a stoichiometric ratio, addinga mixed solution of tetraethylene glycol and ethylene glycol, and performing stirring reaction under a room temperature to obtain a mixed liquid; transferring the mixed liquid to the reaction kettle,performing heating reaction to obtain viscous colloid, and freezing and drying the viscous colloid to obtain precursor powder; and performing high-temperature calcination on the precursor powder underan inert atmosphere to obtain the sheet-shaped sodium ion battery positive electrode. The method is good in repeatability, is simple to operate and has industrial application prospect. The inventionalso provides a sodium ion battery employing the sodium ion battery positive electrode material. The sodium ion battery has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a sodium ion battery cathode material, a preparation method thereof, and a sodium ion battery. Background technique [0002] Due to its high specific capacity and high energy density, lithium-ion batteries are widely used in portable electronic devices and the promotion and application of ion batteries in the field of large-scale energy storage systems. Sodium-ion batteries are regarded as an effective substitute for lithium-ion batteries and have become a research hotspot at home and abroad. Sodium has similar physical and chemical properties to lithium, and the reserves of sodium resources in the crust are considerable (the crustal abundance of lithium is 0.006%, and the crustal abundance of sodium is 2.64%), so it has a great advantage in cost. This also makes sodium-ion batteries one of the most promising battery systems for large-scale energy storag...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/364H01M4/5825H01M4/626H01M10/054Y02E60/10
Inventor 张治安赖延清李煌旭尚国志张凯李劼
Owner 湖南钠邦新能源有限公司
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