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

Method for manufacturing carbon-coated vanadate composite fiber of lithium ion battery anode material

A carbon-coated vanadate and lithium-ion battery technology, applied in battery electrodes, fiber processing, circuits, etc., can solve the problems of poor high-power charging and discharging performance, limited commercial applications, and fast capacity decay, and achieve lightening mechanical The tension and fiber diameter are effectively controllable and the effect of increasing the contact area

Inactive Publication Date: 2013-12-11
XIANGTAN UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapid capacity decay and poor high-power charge-discharge performance of these pure-phase transition metal oxides limit commercial applications.

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
  • Method for manufacturing carbon-coated vanadate composite fiber of lithium ion battery anode material
  • Method for manufacturing carbon-coated vanadate composite fiber of lithium ion battery anode material
  • Method for manufacturing carbon-coated vanadate composite fiber of lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] (a) According to the ratio of ammonium metavanadate: cobalt acetate: citric acid = molar ratio of 2:1:3, weigh 0.468g ammonium metavanadate, 1.26g citric acid and 0.498g cobalt acetate into 10mL deionized In water, heat at 80°C and stir to dissolve; then add 10mL of N,N-dimethylformamide (DMF) and 1.9g of polyvinylpyrrolidone (PVP), and magnetically stir for 10-12 hours to obtain a homogeneous spinning solution. In the spinning solution, the mass concentration of ammonium metavanadate is 2%, and the mass fraction of polyvinylpyrrolidone (PVP) is 9.5%.

[0022] (b) The spinning solution is spun through an electrospinning device, the flow rate of the pump is 1ml / h, the voltage is 26-30KV, and the distance between the syringe needle and the receiving plate is 20cm to obtain the precursor.

[0023] (c) Dry the precursor in a drying oven at 80°C for 12 hours, and then place the dried precursor in a tube furnace. The heat treatment method is to increase from room temperature ...

Embodiment approach 2

[0026] (a) According to the ratio of ammonium metavanadate: manganese acetate: citric acid = molar ratio of 2:1:3, weigh 0.468g ammonium metavanadate, 1.26g citric acid and 0.492g manganese acetate into 10mL deionized , heated at 80°C and stirred to dissolve; then added 10mL of N,N-dimethylformamide (DMF) and 2.0g of polyvinylpyrrolidone (PVP), and magnetically stirred for 10-12 hours to obtain a homogeneous spinning system. Wherein the mass fraction of ammonium metavanadate is 2%, and the mass fraction of polyvinylpyrrolidone (PVP) is 10%.

[0027] (b) The spinning solution is spun through an electrospinning device, the flow rate of the pump is 1ml / h, the voltage is 28KV, and the distance between the syringe needle and the receiving plate is 20cm.

[0028] (c) Dry the precursor in a drying oven at 80°C for 10 hours, then place the dried precursor in a tube furnace, heat treatment method: increase to 700°C at 2°C / min in an argon atmosphere2 , kept at 700°C for 5 hours. After...

Embodiment approach 3

[0035] Implementation mode 4:

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
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a carbon-coated vanadate composite fiber of a negative electrode material of a lithium ion battery. The carbon-coated vanadate composite material is obtained by adopting an electrospinning technology combined with a heat treatment method under an inert atmosphere. The preparation process of the present invention is simple and the particle size of the fiber is controllable. The structure of the carbon-coated vanadate composite fiber obtained by the method is that vanadate nanoparticles with a diameter of about 5 nm are uniformly dispersed in the amorphous carbon continuous phase; As a carbon source, pyrrolidone, on the one hand, relieves the mechanical tension between nanoparticles during cycling, avoids particle agglomeration during cycling, and improves the stability of electrochemical cycling. At the same time, the conductivity of the material and the contact area with the electrolyte are improved, and excellent charge and discharge performance is performed under high current, and it has a good application prospect as a lithium ion battery negative electrode material.

Description

Technical field [0001] The present invention relates to a kind of preparation method of negative electrode material of lithium ion battery, particularly a kind of carbon-coated vanadate (MV 2 o 6 / C) Preparation method of (M=Mn, Co, Mg, Cu). Background technique [0002] In recent decades, lithium-ion batteries have made amazing progress due to their excellent performance, such as energy density and specific capacity much higher than that of primary batteries. Therefore, lithium-ion batteries quickly occupied the consumer market for advanced electronic devices and were listed as one of the most potential energy sources for future electric vehicles, hybrid electric vehicles and plug-in electric vehicles. At present, most commercial lithium-ion batteries use graphite as the negative electrode material, but its theoretical capacity is only limited to 372mAh / g. In order to meet the high energy demand of the new generation of lithium-ion batteries, it is necessary to develop a...

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 Patents(China)
IPC IPC(8): H01M4/1397D01D5/00
CPCY02E60/122Y02E60/10
Inventor 肖启振吴丽娟
Owner XIANGTAN UNIV