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

Mixed crystal type polyanionic phosphate positive electrode material for sodium ion battery and preparation method of mixed crystal type polyanionic phosphate positive electrode material

A sodium-ion battery and polyanion technology, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of high molecular weight of pyrophosphate, low specific capacity of iron-based phosphate, and low specific capacity, so as to improve charging The effect of specific discharge capacity and excellent electrochemical performance

Inactive Publication Date: 2021-11-19
FUDAN UNIV
View PDF9 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method improves the electrochemical performance of iron-based phosphate to a certain extent, but the actual specific capacity of the positive electrode material of iron-based phosphate sodium-ion battery is difficult to compare with that of lithium iron phosphate (170 mAh g -1 )
At present, the main reasons for the low specific capacity of the iron-based phosphate positive electrode are: 1. Maricite-NaFePO obtained by traditional methods 4 The lack of sodium ion migration channel in the crystal structure, thus losing the activity
2. The molecular weight of pyrophosphate is relatively large, which makes this kind of material exhibit a lower specific capacity

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
  • Mixed crystal type polyanionic phosphate positive electrode material for sodium ion battery and preparation method of mixed crystal type polyanionic phosphate positive electrode material
  • Mixed crystal type polyanionic phosphate positive electrode material for sodium ion battery and preparation method of mixed crystal type polyanionic phosphate positive electrode material
  • Mixed crystal type polyanionic phosphate positive electrode material for sodium ion battery and preparation method of mixed crystal type polyanionic phosphate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: solid-phase method synthesizes NaFePO 4 , Na 2 FeP 2 o 7 , Na 4 Fe 3 (PO 4 ) 2 P 2 o 7 The ratio is: 5:1:4 sodium ion battery cathode material. Iron source (ferrous oxalate, 25.92 g), sodium source (sodium pyrophosphate, (13.25 g) + sodium acetate (2.46 g)), phosphorus source (ammonium dihydrogen phosphate, 14.95 g) and carbon source (precursor Body 1-20%, sucrose / glucose), ball milled and mixed evenly, calcined in a tube furnace at 500-600 ℃ for 12h, and the sintering atmosphere was nitrogen or hydrogen-argon mixed gas (5%), and the in-situ carbon package was obtained. Covered three-phase mixed crystal positive electrode material, its X-ray results are detailed in figure 1 .

[0043] The positive electrode material powder prepared above is fully ground with a concentration of 9% polyvinylidene fluoride N-methyl-2-pyrrolidone solution to form a uniform slurry viscous liquid, wherein polyvinylidene fluoride accounts for 10% of the weight of the p...

Embodiment 2

[0046] Embodiment 2: sol-gel method synthesizes NaFePO 4 , Na 2 FeP 2 o 7 , Na 4 Fe 3 (PO 4 ) 2 P 2 o 7The three-phase mixing ratio is: 5:1:4 sodium ion battery cathode material. Add citric acid, ammonium dihydrogen phosphate, and sodium acetate (4.1g) into the solution of ferric nitrate nonahydrate, stir evenly and put it in a blast oven at 80°C for 48 hours, and place the obtained gel precursor in a tube furnace for 300 After pre-calcining at ℃ for 3 hours, grind and mix evenly, and place in a tube furnace for calcination at 500-600℃ for 12 hours to obtain an in-situ carbon-coated three-phase mixed crystal positive electrode material.

[0047] The positive electrode material obtained above was treated and tested according to the method in Example 1, and the performance of the obtained battery was similar to that of the battery in Example 1.

Embodiment 3

[0048] Embodiment 3: spray drying method synthesizes NaFePO 4 , Na 2 FeP 2 o 7 , Na 4 Fe 3 (PO 4 ) 2 P 2 o 7 The three-phase mixing ratio is: 5:1:4 sodium ion battery cathode material. Grind and mix iron phosphate with sodium dihydrogen phosphate and sodium carbonate evenly according to the stoichiometric ratio, add sodium carbonate and sucrose, use water as a solvent, and have a solid-to-liquid ratio of 20%, sand mill, and then spray dry, and place the obtained precursor Calcining at 500-600°C for 12 hours, the sintering atmosphere is nitrogen or hydrogen-argon mixed gas (5%), and the in-situ carbon-coated three-phase mixed crystal positive electrode material is obtained.

[0049] The positive electrode material obtained above was treated and tested according to the method in Example 1, and the performance of the obtained battery was similar to that of the battery in Example 1.

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

PropertyMeasurementUnit
Discharge capacityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a mixed crystal type polyanionic phosphate positive electrode material for a sodium ion battery and a preparation method of the mixed crystal type polyanionic phosphate positive electrode material. The mixed crystal type polyanionic phosphate positive electrode material is a mixed crystal type inorganic material formed by mixing any two or three phases of NaFePO4, Na2FeP2O7 and Na4Fe3(PO4)2P2O7 according to any proportion. The mixed crystal material simultaneously has the advantages of two or three materials, and the performance of the mixed crystal material exceeds that of the three independent materials. The mixed crystal type material further comprises element doping modification, coating function elementary substances or compounds and the like. The material is low in sintering temperature (less than 600 DEG C), very stable in air, environment-friendly, non-toxic and low in price, and is a novel sodium ion battery positive electrode material with a good application prospect; therefore, the obtained sodium ion battery shows excellent cycling stability and rate capability.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a mixed crystal polyanion phosphate cathode material for sodium ion batteries and a preparation method thereof. Background technique [0002] In recent years, with the increasing depletion of fossil energy and the increasing severity of environmental problems such as global warming, research on new energy has received widespread attention in society. Sodium-ion batteries have attracted increasing attention as a low-cost, large-scale energy storage device. The performance of sodium-ion batteries mainly depends on the electrochemical properties of its positive / negative electrode materials. As the commercial application technology of sodium-ion batteries becomes more and more mature, the requirements for battery performance continue to increase. Sodium-ion battery requirements. [0003] Since the advent of sodium-ion secondary batteries, its cathode materi...

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): H01M4/36H01M4/58H01M10/054
CPCH01M4/362H01M4/5825H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 夏永姚曹永杰
Owner FUDAN UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com