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Method for preparing lithium vanadium phosphate as lithium ion battery anode material

A technology for lithium-ion batteries and positive electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of low purity of synthetic products, long reaction time, cumbersome operation, etc., and achieve high machinability and high specific capacity of the electrode sheet , the effect of uniform particle size distribution

Inactive Publication Date: 2010-02-17
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw materials used in the high-temperature solid-phase method are almost all lithium salts, phosphates, vanadium salts or vanadium oxides, which need to be pre-calcined, followed by carbon reduction or hydrogen reduction sintering. The operation is cumbersome, the energy consumption is high, the reaction time is long, and the Low purity and high cost of synthetic products

Method used

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  • Method for preparing lithium vanadium phosphate as lithium ion battery anode material
  • Method for preparing lithium vanadium phosphate as lithium ion battery anode material
  • Method for preparing lithium vanadium phosphate as lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Will 9.094g V 2 o 5 Dissolve in 18.915 g of oxalic acid, stir and dissolve for 0.5 hour to obtain solution (1). 5.542gLi 2 CO 3 and 17.254 g NH 4 h 2 PO 4 Dissolve in a certain amount of distilled water, stir and dissolve for 0.5 hour to obtain solution (2). The solution (2) was slowly added to the solution (1), and the resulting reaction mixture was stirred and heated and stirred at 80° C. for 4 hours to form a gel. The resulting gel was heated at 350°C, N 2 The heat treatment was carried out for 4 hours under the atmosphere. The resulting material is then pressed into a cylindrical shape under a pressure of 5MPa, and put into a microwave tube reactor of 2KW. 2 Under the atmosphere, the temperature was raised from room temperature to 750° C., and the temperature was kept for 5 minutes. The microwave tubular reaction furnace has an infrared temperature measurement function, which can monitor and automatically adjust the sintering temperature. Then it is natur...

Embodiment 2

[0037] Change the microwave sintering time to 10 minutes, and other conditions are the same as in Example 1. The resulting product was analyzed by XRD, showing that they were all Li 3 V 2 (PO 4 ) 3 , without any impurity. The resulting product was assembled into a button battery, which was charged and discharged at a rate of 0.1C. The charge and discharge voltages were 3.0-4.3V and 3.0-4.8V. The first discharge capacity was 113.5 and 151.2mAh / g respectively, and the maximum discharge capacity was 177.5mAh / g. g.

Embodiment 3

[0039] Change the microwave sintering time to 20 minutes, and other conditions are the same as in Example 1. The resulting product was analyzed by XRD, showing that they were all Li 3 V 2 (PO 4 ) 3 , without any impurity. The resulting product was assembled into a button battery, charged and discharged at a rate of 0.1C, the charge and discharge voltages were 3.0-4.3V, 3.0-4.8V, and the first discharge capacities were 111.8 and 144.4mAh / g, respectively.

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Abstract

The invention discloses a method for preparing lithium vanadium phosphate as a lithium ion battery anode material, which comprises the following steps: (1) preparing reaction precursor gel of an anodematerial by a sol-gel method; (2) presintering the reaction precursor gel prepared in the step (1); and (3) placing a material obtained by presintering into a microwave sintering furnace to sinter. The invention combines the sol-gel method with a microwave sintering method and can prepare a product with favorable electrode plate processing ability, electrical conductivity and electrochemical performance by sintering in tens of minutes. The method has high production efficiency, low energy consumption, easy control of technical parameter, favorable batch stability and low production cost and is suitable for mass industrial production.

Description

technical field [0001] The invention relates to a preparation method of lithium vanadium phosphate, a cathode material of a lithium ion battery, in particular to a preparation method of a lithium vanadium phosphate material with excellent electrochemical performance. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, long cycle life and low self-discharge rate. Lithium-ion batteries have been widely used in various portable electronic products and power tools. In recent years, they have been used in electric vehicles (EV) and hybrid Electric vehicle (HEV) power supply also has great application prospects. The performance of lithium-ion batteries depends largely on the cathode material. At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate. Lithium cobalt oxide was first used as a cathode material for lithium-ion batteries, and the techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58F27B5/04F27B5/05F27B5/18
CPCY02E60/12Y02E60/10
Inventor 杨刚刘海东季红梅陈中忠
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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