Lithium ion battery anode Li3V2(PO4)3/C composite material and preparation method thereof

A technology for lithium ion batteries and composite materials, which is applied in the field of lithium ion battery cathode Li3V23/C composite materials and their preparation, and can solve problems such as affecting rate performance and poor electrical conductivity.

Inactive Publication Date: 2012-03-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 3 V 2 (PO 4 ) 3 The conductivity of the material itself is poor, which seriously affects its rate performance

Method used

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  • Lithium ion battery anode Li3V2(PO4)3/C composite material and preparation method thereof
  • Lithium ion battery anode Li3V2(PO4)3/C composite material and preparation method thereof
  • Lithium ion battery anode Li3V2(PO4)3/C composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] VOC 2 o 4 Added to deionized water, stirred magnetically until a blue solution was formed; then, NH 4 h 2 PO 4 , Li 2 CO 3 Added to the above solution and stirred for one hour, the molar ratio of Li / V / P was 3:2:3; then KB carbon was added to the above mixed solution. Heat and stir at 80°C until a slurry-like mixture forms, then dry overnight at 80°C to give a dry solid. KB carbon was added according to its proportion of 20% in the final composite. The obtained granules were milled, tabletted, and heated in 96% Ar, 4% H 2 Calcined at 350°C for 4 hours under the protection of mixed gas. Afterwards, the obtained sample was re-milled and pressed into tablets, calcined at 800°C for 8 hours in the same atmosphere, cooled and then ground (ground until no obvious lumpy particles were seen) to obtain the final Li 3 V 2 (PO 4 ) 3 / C Composite. Li 3 V 2 (PO 4 ) 3 / C composite material and PVDF adhesive were mixed together in a weight ratio of 90:10, and then dispe...

Embodiment 2

[0025] Lithium source Li in embodiment 1 2 CO 3 use CH 3 COOLi was replaced, and other conditions remained unchanged, and the performance of the prepared composite material was still very good.

Embodiment 3

[0027] The protective atmosphere in Example 1 was replaced by pure Ar, and other conditions remained unchanged, and the performance of the prepared composite material was still very good.

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Abstract

The invention relates to a lithium ion battery anode Li3V2(PO4)3/C composite material and a preparation method thereof. In the method, a precursor solution of Li3V2(PO4)3/C can penetrate into a porous structure of a Ketjen Black (KB) porous carbon and then the porous structure is roasted to obtain the product. The Li3V2(PO4)3 particles in the Li3V2(PO4)3/C composite material prepared by the method in the invention has small size, meanwhile, the reaction temperature is low, the reaction time is short and the cost is low. The Li3V2(PO4)3 and carbon nano composite material can be used as an anode for the lithium ion battery, thus having better electrochemical performance.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode Li 3 V 2 (PO 4 ) 3 / C composite material and its preparation method. Background technique [0002] Rechargeable lithium-ion batteries are widely used in various portable electronic products, such as laptops, mobile phones, etc., because of their high energy density and long cycle life. It is currently being used in electric vehicles and energy storage devices. The performance of lithium-ion batteries depends largely on the material properties of the battery, such as positive electrode materials, negative electrode materials, etc. Lithium cobalt oxide has been successfully commercially produced, but the cost is high, cobalt resources are in short supply, and it is highly toxic. It is necessary to develop new cathode materials for lithium batteries. my country is rich in vanadium resources, accounting for one-fifth of the world's vanadium reserves. Synthesis of Li with good electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 梁叔全潘安强
Owner CENT SOUTH UNIV
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