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Vanadium-lithium phosphate composite material for positive electrode of lithium ion battery and preparation method thereof

A lithium-ion battery and lithium vanadium phosphate technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as high-rate charge and discharge performance of lithium-ion batteries, and achieve safe use and excellent high-rate performance , The effect of high charge and discharge capacity

Inactive Publication Date: 2011-01-05
ZHEJIANG GODSEND POWER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers generally use high specific surface carbon, glucose, sucrose, or maltose as carbon source precursors to prepare Li 3 V 2 (PO 4 ) 3 / C composite materials; but the material properties usually obtained can not solve the high-rate charge-discharge performance of lithium-ion batteries well

Method used

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  • Vanadium-lithium phosphate composite material for positive electrode of lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of the raw material Li 2 CO 3 , NH 4 h 2 PO 4 and NH 4 VO 3 Mix, add MWCNTs and PVA accounting for 10% of the total mass of raw materials, the weight ratio of MWCNTs:PVA is 1:1, add 15ml of absolute ethanol and ball mill for 10h on a ball mill, the ball mill speed is set to 350rpm. After the raw material was taken out and dried, it was placed in a tube furnace, and calcined at 850°C for 10 h in an argon atmosphere (gas flow rate of 80 ml / min) to obtain amorphous carbon in situ coated Li 3 V 2 (PO 4 ) 3 The powder formed on the surface (Li 3 V 2 (PO 4 ) 3 / C), containing by mass percentage: 98% Li 3 V 2 (PO 4 ) 3 , 2% carbon.

[0017] The resulting product was analyzed by XRD, showing that they were all Li 3 V 2 (PO 4 ) 3 , there is no impurity phase, the particle size of the product can be obtained by SEM in the range of 200-600nm, and the MWCNTs are evenly distributed among the particles.

[00...

Embodiment 2

[0022] Press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of the raw material Li 2 CO 3 , NH 4 h 2 PO 4 and NH 4 VO 3 Mix, add MWCNTs and PVA accounting for 20% of the total mass of raw materials, the weight ratio of MWCNTs:PVA is 1:1, add 15ml of absolute ethanol and ball mill for 10h on a ball mill, the ball mill speed is set to 350rpm. The raw materials were taken out and dried, put into a tube furnace, and calcined at 850 °C for 10 h in an argon atmosphere (gas flow rate of 80 ml / min) to obtain MWCNTs-modified Li 3 V 2 (PO 4 ) 3 / C cathode material, containing by mass percentage: 96.5% Li 3 V 2 (PO 4 ) 3 , 3.5% carbon.

[0023] The resulting product was analyzed by XRD, showing that they were all Li 3 V 2 (PO 4 ) 3 , there is no impurity phase, the particle size of the product can be obtained by SEM in the range of 200-600nm, and the MWCNTs are evenly distributed among the particles.

[0024] The prepared MWCNTs modified Li 3 V 2 (PO 4 ) 3 / C The po...

Embodiment 3

[0028] Press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of the raw material Li 2 CO 3 , NH 4 h 2 PO 4 and NH 4 VO 3 Mix, add MWCNTs and PVA accounting for 30% of the total mass of raw materials, the weight ratio of MWCNTs:PVA is 1:1, add 15ml of absolute ethanol and ball mill for 10h on a ball mill, the speed of the ball mill is set to 350rpm. The raw materials were taken out and dried, put into a tube furnace, and calcined at 850 °C for 10 h in an argon atmosphere (gas flow rate of 80 ml / min) to obtain MWCNTs-modified Li 3 V 2 (PO 4 ) 3 / C cathode material, containing by mass percentage: 95% Li 3 V 2 (PO 4 ) 3 , 5% carbon.

[0029] The resulting product was analyzed by XRD, showing that they were all Li 3 V 2 (PO 4 ) 3 , there is no impurity phase, the particle size of the product can be obtained by SEM in the range of 200-600nm, and the MWCNTs are evenly distributed among the particles.

[0030] The prepared MWCNTs modified Li 3 V 2 (PO 4 ) 3 / C po...

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Abstract

The invention discloses a vanadium-lithium phosphate composite material for a positive electrode of a lithium ion battery. The material is powder which is formed by coating surface of Li3V2(PO4)3 with multi-wall carbon nanotube-modified amorphous carbon in situ; and the material comprises 95 to 98 mass percent of Li3V2(PO4)3 and 2 to 5 mass percent of carbon. A preparation method of the material comprises the following steps of: mixing Li2CO3, NH4H2PO4 and NH4VO3 serving as raw materials according to a stoichiometric ratio of the Li3V2(PO4)3; adding the multi-wall carbon nanotubes and polyvinyl alcohol into the mixture; adding anhydrous alcohol into the mixture and mixing the mixture by ball milling on a ball mill; and calcining the mixture in an argon atmosphere to obtain the material. The vanadium-lithium phosphate composite material of the invention is used for the positive electrode of the lithium ion battery, has the advantages of high charging and discharging capacity, high cyclical stability, superior high-rate performance and high material conductivity and is suitable for providing a power energy source for portable electric tools, electric motorcycles, electric automobiles and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery cathode material and a preparation method thereof which can be used for high-rate charging and discharging. Background technique [0002] As a high-performance rechargeable green power source, lithium-ion battery has been widely used in various portable electronic products and communication tools in recent years, and will be gradually developed as a power source for electric vehicles, thereby promoting its development to safety, environmental protection, Development in the direction of low cost and high specific energy. The rapid development of new high-energy chemical power supply technology has put forward higher requirements for battery materials. New battery materials with high energy density, high power density, low cost, and environmental friendliness are the focus of current and future research. [0003] Therefore, from the selection of raw mater...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 涂江平乔彦强王秀丽张文魁孙建平黄辉程丽娟缪东栋张官富
Owner ZHEJIANG GODSEND POWER TECH
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