Carbon encapsulated vanadium potassium fluorophosphate carbon nanotube composite material, preparation method and application

A technology of vanadium potassium phosphate carbon and composite materials, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problem of low stability and diffusion coefficient, unstable cycle capacity, and poor battery cycle performance and other problems, to achieve the effect of increasing conductivity and ion diffusion coefficient, improving cycle performance and capacity, and simple steps

Inactive Publication Date: 2018-08-03
NORTHWESTERN POLYTECHNICAL UNIV
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor cycle performance, unstable cycle capacity, low stability and low diffusion coefficient of t

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, a carbon-coated vanadium potassium fluorophosphate carbon nanotube composite material has a molecular formula of: K 3 V 2 (PO 4 ) 2 f 3 @C / CNT, its preparation method specifically includes the following steps:

[0025] S1: Weigh 0.5692g (4.95mmol) of ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.579g (4.95mmol) of ammonium metavanadate NH 4 VO 3 , 0.4793g (8.25mmol) of potassium fluoride KF, 1.317g (6.859mmol) of citric acid monohydrate, ammonium dihydrogen phosphate, ammonium metavanadate, potassium fluoride, and citric acid monohydrate are dissolved in 100ml of deionized water , to obtain a mixed raw material, react the mixed raw material in a water bath, and stir in a water bath at 80° C. for 40 minutes to obtain a precursor solution of vanadium potassium fluorophosphate;

[0026] S2: Add carboxylated carbon nanotubes to the precursor solution prepared above, and then prepare a dry precursor by ultrasonically spraying the resulting mixe...

Embodiment 2

[0029] In this embodiment, a carbon-coated vanadium potassium fluorophosphate carbon nanotube composite material has a molecular formula of: K 3 V 2 o 2 (PO 4 ) 2 F@C / CNT, its preparation method is the same as that of Example 1, the only difference is that in S1, what is weighed is 0.5692g (4.95mmol) of ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.579g (4.95mmol) of ammonium metavanadate NH 4 VO 3 , 0.4793 g (4.95 mmol) of potassium fluoride KF, 1.317 g (6.859 mmol) of citric acid monohydrate.

Embodiment 3

[0031] In this embodiment, a carbon-coated vanadium potassium fluorophosphate carbon nanotube composite material has a molecular formula of: K 3 V 2 (PO 4 ) 2 f 3 @C / CNT, its preparation method is the same as in Example 1, the only difference is that in S2, the air inlet temperature of the spray dryer used for spray drying is 200°C, the air outlet temperature is 130°C, and the feed rate is 10mL / min.

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 discloses a carbon encapsulated vanadium potassium fluorophosphate carbon nanotube composite material as well as a preparation method and an application thereof. Specifically, citric acid is taken as a reducing agent and a carbon source, water is taken as a dispersing agent, ammonium metavanadate, ammonium dihydrogen phosphate, potassium fluoride and citric acid are dissolved in deionized water, a precursor is prepared through a water-bath heating reaction, then carbon nanotubes are added to the precursor, spray drying is performed, ultrasonic treatment is performed simultaneously, and after calcination, the carbon encapsulated vanadium potassium fluorophosphate carbon nanotube composite cathode material with high specific surface area, high conductivity and fast ion transport is obtained. The carbon encapsulated vanadium potassium fluorophosphate carbon nanotube composite material as a cathode material of a potassium ion battery has good cycle performance, and cycle performance and capacity of the potassium ion battery can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for potassium ion batteries, and in particular relates to a carbon-coated sodium vanadium fluorophosphate carbon nanotube composite material and a preparation method and application thereof. Background technique [0002] Due to its high energy density, high working voltage, long cycle life, and low self-discharge rate, lithium-ion batteries have been widely used in various portable electronic products, pure electric vehicles and hybrid vehicles. However, the biggest problem of lithium-ion batteries at present is the high production cost of lithium and the shortage of resources, which are difficult to meet the long-term needs in the future. The working mechanism of potassium-ion batteries is similar to that of lithium-ion batteries, and potassium resources are abundant; thus potassium ions Batteries get a lot of attention. [0003] The positive electrode material of potassium ...

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): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 沈超谢科予龙海原凯魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap