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

Adhesive-free Na3V2(PO4)3/C lithium ion battery composite cathode and preparation method thereof

A lithium-ion battery, binder-free technology, applied in the field of electrochemical power supply, can solve problems such as difficult growth and complex reaction process, and achieve high specific capacity and good cycle performance

Active Publication Date: 2017-10-24
CHINA THREE GORGES UNIV
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while for Na 3 V 2 (PO 4 ) 3 However, the preparation method is mainly a high-temperature solid-state reaction, the reaction process is complicated, and it is difficult to achieve in-situ growth on a conductive substrate.

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
  • Adhesive-free Na3V2(PO4)3/C lithium ion battery composite cathode and preparation method thereof
  • Adhesive-free Na3V2(PO4)3/C lithium ion battery composite cathode and preparation method thereof
  • Adhesive-free Na3V2(PO4)3/C lithium ion battery composite cathode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 6mmol of sodium hydroxide, 2mmol of vanadium pentoxide, and 5mmol of hexamethylenetetramine and dissolve them in a small beaker filled with 20mL of deionized water, stir for 30min until they are fully dissolved; transfer the obtained mixed solution to a hydrothermal In the tank, add deionized water to 80% of the volume of the inner tank, then heat it in a blast oven at 140°C for 24 hours, and cool naturally to obtain a mesophase liquid. Weigh 0.05g of citric acid and 6mmol of ammonium dihydrogen phosphate and dissolve them in a beaker filled with 20mL of deionized water, stir for 20min until they are fully dissolved, then slowly add the cooled intermediate phase liquid dropwise, and stir for 30min until the color It is orange-yellow. Afterwards, the liquid in the beaker was dried in a blast oven at 60°C until the volume was concentrated to half of its original volume, the graphene foam was soaked in the concentrated liquid for 2 hours, and dried in a blast oven at...

Embodiment 2

[0019] Weigh 3mmol of sodium oxalate, 2mmol of vanadium pentoxide, and 5mmol of hexamethylenetetramine and dissolve them in a small beaker filled with 20mL of deionized water, stir for 30min until they are fully dissolved; , add deionized water to 80% of the volume of the liner, then heat it in a blast oven at 120°C for 24 hours, and cool naturally to obtain a mesophase liquid. Weigh 0.05g of glucose and 6mmol of ammonium dihydrogen phosphate and dissolve them in a beaker filled with 20mL of deionized water, stir for 20 minutes until they are fully dissolved, then slowly add the cooled intermediate phase liquid dropwise, and stir for 30 minutes after the addition is complete until the color is Orange yellow. Then dry the liquid in a blast oven at 60°C until the volume is concentrated to half of its original volume, soak the carbon cloth in the concentrated liquid for 2 hours, and dry it in a blast oven at 80°C for 24 hours. The dried carbon cloth was pre-fired at 350 °C for 4...

Embodiment 3

[0021] Weigh 3mmol of sodium hydroxide, 2mmol of ammonium metavanadate, and 5mmol of hexamethylenetetramine and dissolve them in a small beaker filled with 20mL of deionized water, stir for 30min until they are fully dissolved; transfer the resulting mixed solution to a hydrothermal In the tank, add deionized water to 80% of the volume of the inner tank, then heat it in a blast oven at 120°C for 24 hours, and cool naturally to obtain a mesophase liquid. Weigh 0.05g of sucrose and 6mmol of ammonium dihydrogen phosphate and dissolve them in a beaker filled with 20mL of deionized water, stir for 20 minutes until they are fully dissolved, then slowly add the cooled intermediate phase liquid dropwise, and stir for 30 minutes after the addition is complete until the color is Orange yellow. Then dry the liquid in a blast oven at 60°C until the volume is concentrated to half of its original volume, soak the carbon paper in the concentrated liquid for 2 hours, and dry it in a blast ove...

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 provides an intermediate liquid phase method for preparing an adhesive-free Na3V2(PO4)3 / C lithium ion battery composite cathode; the method specifically comprises the steps as follows: sodium sources and vanadium sources are weighed and put into a small beaker, deionized water is added and stirred for 30min until complete dissolution; the solution is transferred to a hydrothermal liner, the deionized water is further added until reaching 80% of volume of the liner, and the solution is heated for 12-48h by water in an air-circulating oven at the temperature of 100-180 DEG C; phosphorus sources and organic carbon sources are weighed and put into the beaker, the deionized water is added and stirred for 20min until complete dissolution, and then intermediate phase liquid acquired after natural cooling is slowly added into the beaker in which the phosphorus sources and organic carbon sources are dissolved, stirred for 20min until the solution becomes orange-yellow, and then heated to be concentrated to a certain volume; then the carbon substrate is steeped into the liquid phase precursor for 1-4h, and dried for 24h in the air-circulating oven at the temperature of 80 DEG C; and the dried carbon substrate is pre-burned for 2-6h at the temperature of 350 DEG C in the atmosphere of nitrogen, and calcined for 6-12h at the temperature of 650-850 DEG C, and the self-supporting Na3V2(PO4)3 / C electrode is acquired after natural cooling and shows good electrochemical performance when being used as the lithium ion battery cathode.

Description

technical field [0001] The invention relates to a class of high-performance binder-free lithium-ion battery positive electrodes, in particular to a Na 3 V 2 (PO 4 ) 3 The invention discloses a method for preparing positive electrodes of / C composite materials, belonging to the field of electrochemical power sources. technical background [0002] Lithium-ion batteries have the advantages of high energy density, high safety performance, low self-discharge, long life, and no memory, and have become the main power source of portable electronic products. In the future, it may also be applied to electric vehicles, hybrid vehicles, field communications, energy storage grids, etc. According to the structure, lithium-ion batteries can be divided into: positive electrode, negative electrode, diaphragm, and electrolyte. Among them, lithium is undoubtedly the core element of lithium-ion batteries: the electrolyte is an organic solvent containing lithium, and the commercial positive...

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): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 倪世兵唐俊康桃杨学林
Owner CHINA THREE GORGES UNIV