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

Potassium ion battery vanadium phosphate@carbon/expanded microcrystalline graphite composite negative electrode active material, and preparation method and application thereof

A negative electrode active material, microcrystalline graphite technology, applied in battery electrodes, carbon preparation/purification, nanotechnology for materials and surface science, etc., can solve the problems of difficult potassium ion intercalation and deintercalation, and achieve the promotion of intercalation and removal process, simple and reliable operation, and excellent Coulombic efficiency

Active Publication Date: 2021-08-20
CENT SOUTH UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the intercalation and deintercalation ions in potassium ion batteries are potassium ions, whose radius is 373% of that of lithium ions, which makes it difficult to transfer many theories and materials applicable to lithium batteries to potassium ion batteries, and it is difficult to realize Good intercalation and deintercalation of ions

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
  • Potassium ion battery vanadium phosphate@carbon/expanded microcrystalline graphite composite negative electrode active material, and preparation method and application thereof
  • Potassium ion battery vanadium phosphate@carbon/expanded microcrystalline graphite composite negative electrode active material, and preparation method and application thereof
  • Potassium ion battery vanadium phosphate@carbon/expanded microcrystalline graphite composite negative electrode active material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Step (1): get 1g carbon content and be 70%, particle size is the microcrystalline graphite powder of 300 meshes, it is 10:1L / Kg to join perchloric acid solution (perchloric acid solution) with perchloric acid by liquid-solid ratio The concentration is 72%), ultrasonic 2h, make it mix evenly; Add potassium permanganate according to the mass ratio of microcrystalline graphite powder and strong oxidizing agent (potassium permanganate) is 2:1, after stirring evenly at room temperature, Raise the temperature to 60°C and continue stirring for 5 hours; after filtering, washing with absolute ethanol and deionized water three times, and drying, the resulting product is placed in a graphite expansion furnace and expanded at 1000°C for 1 hour to obtain expanded microcrystalline graphite.

[0076] Step (2): 2mmol ammonium metavanadate (NH 4 VO 3 ) and 4mmol anhydrous citric acid (C 6 h 8 o 7 ) was dissolved in 50mL of deionized water, and stirred for 1h in an oil bath at 60°C (...

Embodiment 2

[0081] Compared with Example 1, the main difference is to change the size of the graphite powder in the preparation process of expanded microcrystalline graphite, specifically:

[0082] Change the particle size of the microcrystalline graphite powder of step (1) into 800 orders. The rest of the experimental conditions were unchanged. The vanadium phosphate / carbon / expanded microcrystalline graphite composite material obtained in this embodiment is charged and discharged at a current density of 0.1C, and the rate performance of the battery is tested at different current densities such as 20C and 50C; it is tested at a current density of 20C. cycle performance. The test results show that the potassium ion battery negative electrode prepared in this example has good electrochemical performance: at a current density of 0.1C, its first cycle discharge capacity is 204mAh / g; at a discharge density of 20C and 50C, it can still maintain Specific capacities of 198mAh / g and 144mAh / g. T...

Embodiment 3

[0084] Compared with Example 1, the difference is only that the expansion temperature of expanded graphite is changed, specifically:

[0085]Change the temperature to 1200°C for high-temperature expansion to obtain expanded microcrystalline graphite. The rest of the experimental conditions were unchanged. The vanadium phosphate / carbon / expanded microcrystalline graphite composite material obtained in this embodiment is charged and discharged at a current density of 0.1C, and the rate performance of the battery is tested at different current densities such as 20C and 50C; it is tested at a current density of 20C. cycle performance. The test results show that the potassium ion battery negative electrode prepared in this example has good electrochemical performance: at a current density of 0.1C, its first cycle discharge capacity is 241mAh / g; at a discharge density of 20C and 50C, it can still maintain Specific capacities of 208mAh / g and 163mAh / g. The discharge capacity retenti...

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
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to a potassium ion battery, and particularly relates to a potassium ion battery vanadium phosphate@carbon / expanded microcrystalline graphite composite negative electrode active material. The active material comprises expanded microcrystalline graphite and vanadium phosphate@carbon composite particles embedded in expanded microcrystalline graphite holes and interlayers in situ. The invention also provides a preparation method and application of the material. According to the negative electrode active material for the potassium ion battery, the expanded microcrystalline graphite is used as a framework, and the carbon-coated vanadium phosphate particles are innovatively embedded (bridged) in holes and layers of the expanded microcrystalline graphite, so that the material has excellent ionic conductivity and electronic conductivity at the same time, is beneficial to improving the intercalation and deintercalation stability of potassium ions, and improves the capacity, the multiplying power and the cycling stability of the material.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a negative electrode active material of a potassium ion battery. Background technique [0002] With the gradual reduction of traditional fossil fuels and the increasingly serious environmental problems, green and pollution-free green energy has attracted more and more attention. Advanced energy storage is an important part of it, and it is also a key supporting technology that urgently needs breakthroughs. The electrochemical energy storage technology typically represented by lithium-ion batteries characterized by high specific energy and long cycle life has the advantages of good equipment mobility, fast response speed, high energy density and high efficiency. Lithium-ion batteries have the advantages of high operating voltage, large specific energy, long life, low self-discharge rate and wide temperature range, and have become the mainstream energy storage system at presen...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054C01B25/37C01B32/05C01B32/225B82Y30/00B82Y40/00
CPCH01M4/366H01M4/5825H01M4/625H01M10/054C01B25/372C01B32/225C01B32/05B82Y30/00B82Y40/00C01P2004/80C01P2004/03C01P2002/88C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 张治安李红中胡均贤赖延请张凯李劼
Owner CENT SOUTH 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