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

Preparation of positive electrode material (Li3V2 (PO4)3/Cu) of lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to obtain size, low calcination temperature, and easy agglomeration of powders, and achieve uniform distribution, high purity, and simple process methods Effect

Inactive Publication Date: 2013-03-13
SHAANXI UNIV OF SCI & TECH
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the solid-state method and the microwave method require high-temperature calcination, so the obtained powder is easy to agglomerate, and it is difficult to obtain Li with uniform size and regular shape. 3 V 2 (PO 4 ) 3 Powder; the purity and crystallinity of the product can be effectively improved by using the sol-gel method, and the calcination temperature is also low. In addition, the morphology and size of the obtained powder can be effectively controlled by adding a surfactant to the precursor solution; but the traditional The sol-gel method has a long cycle, and the time required to convert the solution into a gel is about 10h, which greatly limits the Li 3 V 2 (PO 4 ) 3 production efficiency

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 of positive electrode material (Li3V2 (PO4)3/Cu) of lithium ion battery
  • Preparation of positive electrode material (Li3V2 (PO4)3/Cu) of lithium ion battery
  • Preparation of positive electrode material (Li3V2 (PO4)3/Cu) of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 The preparation method of / Cu, wherein Cu accounts for the 3wt% of product gross mass, and preparation comprises the steps:

[0019] Step 1: Add 0.06mol NH 4 VO 3 Dissolve in 1L deionized water, add 0.09mol LiOH·H to the solution successively 2 O, 0.03mol citric acid and 0.09mol H 3 PO 4 , stir, mix well;

[0020] Step 2: Add 0.006mol Cu(CH 3 COO) 2 , and stir evenly to obtain a yellow-green transparent precursor solution;

[0021] Step 3: Put the precursor solution in a hydrothermal kettle and react at 160°C for 1 hour. After the reaction is completed and the temperature drops to room temperature, open the reaction kettle and take out the dark blue gel-like product in the kettle;

[0022] Step 4: put the dark blue gel-like product in an oven, dry at 90°C for 15 hours to obtain a dry gel, and then grind the dry gel to obtain a powder;

[0023] Step 5: Put dry gel powder in N 2 Calcined under protected co...

Embodiment 2

[0025] Lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 The preparation method of / Cu, wherein Cu accounts for 8wt% of product gross mass, preparation comprises the steps:

[0026] Step 1: Add 0.2mol NH 4 VO 3 Dissolve in 2L deionized water, add 0.3mol LiOH·H to the solution successively 2 O, 0.05mol citric acid and 0.3mol H 3 PO 4 , stir, mix well;

[0027] Step 2: Add 0.055mol Cu(CH 3 COO) 2 , and stir evenly to obtain a yellow-green transparent precursor solution;

[0028] Step 3: Put the precursor solution in a hydrothermal kettle and react at 160°C for 2 hours. After the reaction is completed and the temperature drops to room temperature, open the reaction kettle and take out the dark blue gel-like product in the kettle;

[0029] Step 4: put the dark blue gel-like product in an oven, dry at 90°C for 12 hours to obtain a dry gel, and then grind the dry gel to obtain a powder;

[0030] Step 5: Put dry gel powder in N 2 Calcined under protected conditions...

Embodiment 3

[0032] Lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 The preparation method of / Cu, wherein Cu accounts for 12wt% of product gross mass, and preparation comprises the steps:

[0033] Step 1: Add 0.08molNH 4 VO 3 Dissolve in 1L deionized water, add 0.12mol LiOH·H to the solution successively 2 O, 0.06mol citric acid and 0.12mol H 3 PO 4 , stir, mix well;

[0034] Step 2: Add 0.035mol Cu(CH 3 COO) 2 , and stir evenly to obtain a yellow-green transparent precursor solution;

[0035] Step 3: Put the precursor solution in a hydrothermal kettle and react at 160°C for 1.5 hours. After the reaction is completed and the temperature drops to room temperature, open the reaction kettle and take out the dark blue gel-like product in the kettle;

[0036] Step 4: Put the dark blue gel-like product in an oven, dry at 95°C for 14 hours to obtain a dry gel, and then grind the dry gel to obtain a powder;

[0037] Step 5: Put dry gel powder in N 2 Calcined under protected c...

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 positive electrode material (Li3V2(PO4)3 / Cu) of a lithium ion battery, wherein Cu accounts for 3-15wt% of the total mass of a product, and the preparation comprises the steps of: firstly dissolving NH4VO3 in deionized water; then sequentially adding LiOH.H2O, citric acid and H3PO4, so as to obtain a mixed solution; adding Cu(CH3COO)2 in the mixed solution and stirring the mixed solution uniformly, so as to obtain a yellow green transparent precursor solution; placing the precursor solution in a hydrothermal kettle for heating reaction, so as to obtain a mazarine gel-like product; drying the mazarine gel-like product in an oven to obtain dry gel and grinding the dry gel to obtain powder; and calcining the dry gel powder under the protection of N2, and reducing temperature for cooling the dry gel powder so as to obtain Li3V2(PO4)3 / Cu composite powder. According to the preparation method, a sol-gel technology is assisted by using a hydrothermal technology and the technical method is simple and efficient; a crystal phase of the obtained powder is developed completely and the purity of the powder is high; and the Cu is uniformly distributed in the Li3V2(PO4)3 powder.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a lithium ion battery cathode material Li 3 V 2 (PO 4 ) 3 / Cu preparation. Background technique [0002] As a new generation of lithium-ion battery cathode material, lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) has the characteristics of good thermal stability, large charge and discharge voltage, high discharge specific capacity and excellent safety performance, and has gradually become a research hotspot for scholars. Li 3 V 2 (PO 4 ) 3 It has two crystal structures, one is monoclinic and the other is orthorhombic. Due to the monoclinic structure of Li 3 V 2 (PO 4 ) 3 The electrochemical performance is much better than that of orthorhombic Li 3 V 2 (PO 4 ) 3 , the current research on lithium vanadium phosphate mainly focuses on the monoclinic Li 3 V 2 (PO 4 ) 3 . Monoclinic Li 3 V 2 (PO 4 ) 3 Each unit cell can reversibly deintercalate...

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): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 夏傲黄剑锋谈国强
Owner SHAANXI UNIV OF SCI & TECH