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

Preparation method of sodium ion battery positive electrode composite material V2O5/NaV6O15

A technology of sodium ion batteries and composite materials, which is applied in the field of preparation of V2O5/NaV6O15 composite materials for sodium ion batteries, can solve the problems of low electronic conductivity and ionic conductivity, poor rate performance, and low reversible capacity, and achieve power consumption Short time, simple equipment, and good cycle performance

Inactive Publication Date: 2018-11-23
HUNAN INSTITUTE OF ENGINEERING
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium pentoxide has low electronic conductivity and ionic conductivity, and its structure is unstable during the process of intercalating sodium ions, resulting in low reversible capacity and poor rate capability.
[0005] Sodium vanadate (NaV 6 o 15 ) due to its channel structure and good ion transferability, the structure is relatively stable in the process of sodium ion deintercalation, so it has good cycle performance as a cathode material for sodium ion batteries, but its specific capacity is relatively low

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
  • Preparation method of sodium ion battery positive electrode composite material V2O5/NaV6O15
  • Preparation method of sodium ion battery positive electrode composite material V2O5/NaV6O15
  • Preparation method of sodium ion battery positive electrode composite material V2O5/NaV6O15

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Disperse 0.5g of vanadium dioxide powder into 15mL of aqueous sodium hydroxide solution with a concentration of 0.1mol / L, pour the dispersion into a hydrothermal reaction kettle, conduct a hydrothermal reaction at 180°C for 6 hours, and filter the precipitate after cooling to room temperature. Dry at 60°C to obtain the precursor powder. The precursor is heated to 350°C at a rate of 1°C / min in the air and kept at 350°C for 4 hours. After cooling to room temperature, V 2 o 5 / Nav 6 o 15 nanocomposites. figure 1 Shown is the V prepared in Example 1 2 o 5 / Nav 6 o 15 XRD refinement pattern of the nanocomposite. figure 1 The XRD result shows that the material synthesized in this embodiment is made of V 2 o 5 (space group: Pmmn) and monoclinic NaV 6 o 15 (Space group: A2 / m) Composites, where V 2 o 5 and NaV 6 o 15 The mass fractions of are 68.675% and 31.325%, respectively. figure 2 Shown is the V prepared in Example 1 2 o 5 / Nav 6 o 15 SEM image of the n...

Embodiment 2

[0026] Disperse 0.5g vanadium dioxide powder into 15mL aqueous sodium hydroxide solution with a concentration of 0.2mol / L, pour the dispersion liquid into a hydrothermal reaction kettle, conduct a hydrothermal reaction at 180°C for 2 hours, and filter the precipitate after cooling to room temperature. Dry at 60°C to obtain the precursor powder. The precursor is heated to 350°C in the air at a heating rate of 5°C / min and kept at 350°C for 4 hours. After cooling to room temperature, V 2 o 5 / Nav 6 o 15 composite material.

Embodiment 3

[0028] Disperse 0.5g of vanadium dioxide powder into 15mL of aqueous sodium hydroxide solution with a concentration of 0.1mol / L, pour the dispersion into a hydrothermal reaction kettle, conduct a hydrothermal reaction at 220°C for 2 hours, and filter the precipitate after cooling to room temperature. Dry at 60°C to obtain the precursor powder. The precursor is heated to 350°C at a heating rate of 1°C / min in the air and kept at 350°C for 4 hours. After cooling to room temperature, V 2 o 5 / Nav 6 o 15 composite material.

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 preparation method of a sodium ion battery positive electrode composite material V2O5 / NaV6O15. According to the preparation method of the sodium ion battery positive electrode composite material V2O5 / NaV6O15, vanadium oxide is dispersed into a sodium hydroxide water solution with concentration of 0.01-0.5mol / L to obtain a suspension liquid; the yellow suspension liquid issubjected to a hydrothermal reaction at 120-220 DEG C for 2-24h; then natural cooling is performed to the room temperature, and filtering and drying are carried out to obtain precursor powder; and the precursor is heated in the air to 300-500 DEG C to be calcined to obtain the V2O5 / NaV6O15 composite material. When the V2O5 / NaV6O15 composite material prepared by the method is used as a positive electrode material of the sodium-ion battery, relatively high specific discharge capacity, high cycle performance and long service life are shown; and in addition, the preparation method has the advantages that the adopted equipment is simple, the reaction conditions are mild, the time consumption is short, the reaction is environment-friendly, the production cost is low, and the method is suitablefor large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for sodium ion batteries, in particular to a positive electrode material V for sodium ion batteries 2 o 5 / Nav 6 o 15 Methods of preparation of composite materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices and electric vehicles due to their high energy density and power density, long cycle life, low self-discharge, and environmental friendliness. However, lithium reserves are very limited, and it is difficult to meet the needs of large-scale development in the future. Therefore, finding a secondary battery that can replace lithium-ion batteries has important practical significance for human life and development. [0003] Sodium and lithium are the same main group elements. Not only do they have similar chemical properties, but also sodium is abundant on the earth and the price is low. Therefore...

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): H01M4/36H01M4/48H01M4/58H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/48H01M4/5825H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 秦牡兰刘万民黄先威
Owner HUNAN INSTITUTE OF ENGINEERING