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Synthesis of lithium ion battery anode material vanadium lithium phosphate using sol-gel method

A technology of lithium ion battery and sol-gel method, which is applied in the field of lithium vanadium phosphate synthesis lithium ion battery positive electrode material by sol-gel method, can solve the problems of less research, high cost of synthetic products, long reaction time, etc., to reduce pollution, The effect of low production cost and reduced valence

Inactive Publication Date: 2006-06-14
NANKAI UNIV
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Problems solved by technology

[0004] J.Barker et al. discovered Li-ion secondary battery cathode material Li with NASICON structure 3 V 2 (PO 4 ) 3 , but there are relatively few studies
The commonly used synthesis method is high-temperature solid-phase synthesis of Li 3 V 2 (PO 4 ) 3 , using hydrogen or carbon as a reducing agent, but the reaction time is very long and the cost of the synthetic product is high

Method used

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  • Synthesis of lithium ion battery anode material vanadium lithium phosphate using sol-gel method
  • Synthesis of lithium ion battery anode material vanadium lithium phosphate using sol-gel method
  • Synthesis of lithium ion battery anode material vanadium lithium phosphate using sol-gel method

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Embodiment

[0020] Take V 2 o 3 8.686g, NH 4 h 2 PO 4 20.000g, Li 2 CO 3 Put 6.556g and 60.089g of citric acid in a 500ml beaker, add 100ml of distilled water, stir well at room temperature for 0.5h, then raise the temperature to 80°C, and keep the temperature at this temperature for 6h to form a sol-gel. The sol-gel was dried in an oven at 90°C, pressed into tablets at 25Mpa, and then calcined in a tube furnace with argon protective gas at 850°C for 4 hours and then cooled down to room temperature naturally to obtain the required battery cathode materials. Tested by SEM, the Li prepared by this method 3 V 2 (PO 4 ) 3 The particle size is between 1 and 3 μm. figure 1 It is the XRD pattern of the product. The active material, conductive agent, and binder (PTFE) are mixed at 85:10:5, pressed into a circular electrode sheet with a diameter of 8mm, and charged and discharged at a rate of 0.2C. The voltage range 3-4.9V, see the results figure 2 and image 3 , the charge capac...

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Abstract

The present invention relates to method for synthesizing positive electrode material vanadium lithium phosphate of lithium ion cell by using sol-gel process. Said method includes the following steps: adopting sol-gel reaction, using vanadium pentoxide or vanadium trioxide, ammonium dihydrogen phosphate, lithium carbonate and citric acid as raw material to synthesize precursor body of lithium ion cell positive electrode material Li3V2(PO4)3, then under the protection of inert gas roasting said precursor body to make V5+ be completely reduced into V3+ and simultaneously produce product Li3V2(PO4)3.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion secondary battery, in particular to a method for synthesizing lithium vanadium phosphate lithium ion battery positive electrode material by a sol-gel method. Lithium-ion battery cathode materials synthesized by this method Li 3 V 2 (PO 4 ) 3 , has a higher discharge voltage, can be used as a cathode material for lithium-ion batteries above 4V, and has good electrochemical performance, high charge-discharge capacity and good cycle stability. Background technique [0002] In recent years, due to the high energy density and long cycle life of lithium-ion secondary batteries, they are widely used in various portable electronic products and communication tools, and they also have huge applications in electric vehicles and energy storage equipment. prospect. The performance of lithium-ion batteries depends largely on the cathode material. At present, lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCC01B25/45H01M4/5825Y02E60/10
Inventor 阎杰任慢慢李宇展周震高学平卞锡奎
Owner NANKAI UNIV
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