Preparation method of carbon coated vanadium sodium phosphate positive electrode material

A technology of sodium vanadium phosphate and cathode material, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve problems such as poor material performance, and achieve the effects of excellent electrochemical performance, reduced side reactions, and simple steps

Inactive Publication Date: 2016-02-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this method is that although the synthetic method is simple, the synthesized Na 3 V 2 (PO 4 ) 3 poor material properties

Method used

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  • Preparation method of carbon coated vanadium sodium phosphate positive electrode material
  • Preparation method of carbon coated vanadium sodium phosphate positive electrode material
  • Preparation method of carbon coated vanadium sodium phosphate positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Add 5gNH 4 VO 3 , 10gNaH 2 PO 4 2H 2 O and 3.75g of glucose were placed in a ball mill jar, then 100mL of water was added as a dispersant, and at 250kHz, ultrasonically mixed for 2 hours, and then ball milled at a speed of 250r / min for 7 hours to obtain a yellow suspension; (2) Step (1) ) The obtained yellow suspension is spray-dried in a spray dryer with the air inlet temperature at 180°C, the air outlet temperature at 130°C, and the feed rate at 10mL / min to obtain a powdery precursor; (3) the step ( 2) The obtained powdery precursor was first calcined at 350°C for 4 hours under high-purity argon gas, and then calcined at 700°C for 8 hours to obtain a carbon-coated sodium vanadium phosphate cathode material.

[0032] Such as figure 1 As shown, the obtained carbon-coated sodium vanadium phosphate positive electrode material has high crystallinity and complete crystal form, and what is detected is the pure phase of sodium vanadium phosphate.

[0033] Such as ...

Embodiment 2

[0039] (1) Add 5gNH 4 VO 3 , 10gNaH 2 PO 4 2H 2 O and 2.5g of glucose were placed in a ball mill jar, then 100mL of water was added as a dispersant, and ultrasonically mixed for 4 hours at 50kHz, and then ball milled at a speed of 200r / min for 4 hours to obtain a yellow suspension; (2) Step (1) ) The obtained yellow suspension is spray-dried in a spray dryer with the air inlet temperature at 150°C, the air outlet temperature at 120°C, and the feed rate at 5mL / min to obtain a powdery precursor; (3) the step ( 2) The obtained powdery precursor was first calcined at 300°C for 3h and then at 600°C for 6h under high-purity argon gas to obtain a carbon-coated sodium vanadium phosphate positive electrode material.

[0040] Battery assembly: take 0.24g Na obtained in this embodiment respectively 3 V 2 (PO 4 ) 3 The material is used as the positive electrode material, adding 0.03g acetylene black (SP) as the conductive agent and 0.03g PVDF (HSV-900) as the binder, after fully g...

Embodiment 3

[0042] (1) Add 5gNH 4 VO 3 , 10gNaH 2 PO 4 2H 2 0 and 5g of glucose were placed in a ball mill jar, then 100mL of water was added as a dispersant, and ultrasonically mixed for 0.5h at 400kHz, and then ball milled at a speed of 300r / min for 10h to obtain a yellow suspension; (2) Step (1) ) The obtained yellow suspension is spray-dried in a spray dryer with the air inlet temperature at 200°C, the air outlet temperature at 150°C, and the feed rate at 20mL / min to obtain a powdery precursor; (3) Step ( 2) The obtained powdery precursor was calcined at 400°C for 5 hours under high-purity argon gas, and then calcined at 750°C for 10 hours to obtain a carbon-coated sodium vanadium phosphate cathode material.

[0043] Battery assembly: take 0.24g Na obtained in this embodiment respectively 3 V 2 (PO 4 ) 3 The material is used as the positive electrode material, adding 0.03g acetylene black (SP) as the conductive agent and 0.03g PVDF (HSV-900) as the binder, after fully grinding...

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Abstract

A preparation method of a carbon coated vanadium sodium phosphate positive electrode material comprises the steps: with glucose as a reducing agent and a carbon source and water as a dispersant, carrying out ball milling of NH4VO3, NaH2PO4.2H2O and glucose in water, carrying out spray drying, calcining, and thus obtaining the carbon coated vanadium sodium phosphate positive electrode material. The method has the advantages of low synthesis temperature, simple steps, easily obtained raw materials, and advantageous industrialization; the obtained carbon coated vanadium sodium phosphate positive electrode material has a structure with uniform primary particles, has the particle size of 100-200 nm, and has the characteristics of short sodium ion diffusion distance, fast transmission speed, high specific surface area, high electrical conductivity and fast ion transmission and the like. The obtained carbon coated vanadium sodium phosphate positive electrode material is assembled into a battery; in a voltage scope of 2.0-3.75 V and under 1 C multiplying power, the highest first charge and discharge capacity per gram can reach 93.5 mAh*g<-1>, the capacity retention rate can be up to 97.7% after cycling for 50 circles with the 1C multiplying power, and excellent electrochemical performance is showed.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a sodium ion battery, in particular to a method for preparing a carbon-coated sodium vanadium phosphate positive electrode material. Background technique [0002] Since the 1990s, lithium-ion batteries have been widely used in electronic devices such as mobile devices due to their high energy density and light weight. However, lithium-ion batteries have defects such as high price and limited reserves, and the properties of sodium ions and lithium ions of the same main group have many similarities, and sodium ions are entirely likely to become a widely used secondary battery. Moreover, compared with lithium-ion batteries, sodium-ion batteries have lower raw material costs than lithium-ion batteries, higher battery potentials than corresponding lithium-ion batteries, and better safety performance. [0003] NASICON refers to a class of solid electrolytes with excellent ionic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/05
CPCH01M4/366H01M4/5825H01M4/625H01M10/05Y02E60/10
Inventor 张佳峰刘益张宝明磊王小玮
Owner CENT SOUTH UNIV
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