Unlock instant, AI-driven research and patent intelligence for your innovation.

Positive electrode material for transition metal-doped sodium ion battery and preparation and application thereof

A technology for sodium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of no improvement in electrical conductivity and low electrical conductivity, and achieve excellent cycle performance, small particle size, and electrical conductivity. boosted effect

Inactive Publication Date: 2019-05-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF3 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In vanadium fluorophosphate, due to the insulating properties of phosphate, its electrical conductivity is low. Some researchers improve its electrical conductivity by carbon coating and particle size reduction, but these methods only increase the apparent electrical conductivity of the material. , there is no improvement in the intrinsic conductivity of the material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positive electrode material for transition metal-doped sodium ion battery and preparation and application thereof
  • Positive electrode material for transition metal-doped sodium ion battery and preparation and application thereof
  • Positive electrode material for transition metal-doped sodium ion battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: (Transition metal Ti doping to prepare Na 3 V 1.9 Ti 0.1 (PO 4 ) 2 F 3 / C)

[0021] Weigh 2.520g sodium fluoride (both fluorine source and sodium source), 4.445g ammonium metavanadate, 0.159g titanium dioxide, 4.601g ammonium dihydrogen phosphate and 8.406g citric acid (both as carbon source and as reducing Add to 250mL agate ball milling pot, then add 80g agate balls and 60ml deionized water, put the ball milling pot in the ball mill, ball mill at 580rpm for 12h. Pour the resulting mixed solution (except the agate ball) into a beaker, wash the agate pellets with deionized water, pour the cleaning solution into the beaker, wash 3 times, stir with a magnet, evaporate the solvent at 80℃, and put it in 120 Keep it in an oven at ℃ for 8 hours to obtain precursor A. The precursor A is pre-sintered at 350°C for 5h and 750°C for 8h in a nitrogen atmosphere. After cooling, the transition metal-doped cathode material Na is obtained. 3 V 1.9 Ti 0.1 (PO 4 ) 2 F 3 / C.

Embodiment 2

[0022] Example 2: (Transition metal Fe doping to prepare Na 3 V 1.95 Fe 0.05 (PO 4 ) 2 F 3 / C)

[0023] Weigh 2.520g sodium fluoride (both fluorine source and sodium source), 4.562g ammonium metavanadate, 0.407g (FeNO 3 ) 3 ·9H 2 O, 4.601g ammonium dihydrogen phosphate and 8.406g citric acid (both as a carbon source and as a reducing agent), add them to a 250mL agate ball mill jar, then add 80g agate balls and 60ml deionized water, and place the ball mill jar In the ball mill, ball mill at a speed of 580 rpm for 12 hours. Pour the resulting mixed solution (except the agate ball) into a beaker, wash the agate pellets with deionized water, pour the cleaning solution into the beaker, wash 3 times, stir with a magnet, evaporate the solvent at 80℃, and put it in 120 Keep it in an oven at ℃ for 8 hours to obtain precursor A. The precursor A is pre-sintered at 350°C for 5h and 750°C for 8h in a nitrogen atmosphere. After cooling, the transition metal-doped cathode material Na is obtain...

Embodiment 3

[0024] Example 3: (Preparation of Na by doping transition metal Ni 3 V 1.93 Ni 0.07 (PO 4 ) 2 F 3 / C)

[0025] Weigh 2.520g sodium fluoride (both fluorine source and sodium source), 4.515g ammonium metavanadate, 0.404gNi(NO 3 ) 2 ·6H 2 O, 4.601g ammonium dihydrogen phosphate and 8.406g citric acid (both as a carbon source and as a reducing agent), add them to a 250mL agate ball mill jar, then add 80g agate balls and 60ml deionized water, and place the ball mill jar In the ball mill, ball mill at a speed of 580 rpm for 12 hours. Pour the resulting mixed solution (except the agate ball) into a beaker, wash the agate pellets with deionized water, pour the cleaning solution into the beaker, wash 3 times, stir with a magnet, evaporate the solvent at 80℃, and put it in 120 Keep it in an oven at ℃ for 8 hours to obtain precursor A. The precursor A is pre-sintered at 350°C for 5h and 750°C for 8h in a nitrogen atmosphere. After cooling, the transition metal-doped cathode material Na is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to preparation of a positive electrode material for a transition metal-doped sodium ion battery and application thereof in the field of a sodium ion battery. The constituent of the positive electrode material is Na<3>V<2-x>M<x>(PO<4>)<2>F<3> / C, wherein x is more than or equal to 0.001 but less than or equal to 0.5, and M is transition metal. Compared with Na3V2(PO4)2F3 / C without doping, the Na<3>V<2-x>M<x>(PO<4>)<2>F<3> / C has the advantages of smaller bandgap, electrons are more easily simulated to a conduction band from a valence band, local defect can be formed by doping, and the conductivity can be improved; meanwhile, the doped transition metal ion has a support effect in the Na3V2(PO4)2F3 / C, Na<+> diffusion passage becomes large after doping of a transition element with relatively large ion radius, the de-intercalation speed of Na in a crystal becomes large, the structure stability of the material is improved, structure twisting, deformation and collapse during the long-term charge-discharge process of the material are prevented, and the cycle stability of the material is improved; and the prepared Na<3>V<2-x>M<x>(PO<4>)<2>F<3> / C material shows specific discharging capacity approaching to theoretical capacity, excellent rate performance and cycle property by electrochemical performance test.

Description

Technical field [0001] The invention relates to the field of electrode materials for sodium ion batteries, in particular to a preparation method and application of a transition metal doped cathode material for sodium ion batteries. Background technique [0002] Energy is an important driving force for social development. Currently, the energy used is mainly divided into renewable energy (wind, hydro, solar, etc.) and non-renewable energy (coal, oil, natural gas, etc.). Due to the shortage of non-renewable energy resources and serious environmental pollution, the development of renewable energy has attracted more and more attention, but renewable energy is discontinuous and unstable, and its direct connection to the grid will have a great impact on the grid. Energy storage technology is a key technology to solve the discontinuity and instability of renewable energy. Among the many energy storage technologies, lithium-ion batteries have the advantages of high energy density and lo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 张华民郑琼易红明李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI