Method for preparing anode material vanadium lithium fluorinated phosphate of lithium ion secondary battery

A technology of lithium fluoride vanadium phosphate and secondary batteries, which is applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of high cost of synthetic products, cumbersome operation, long reaction time, etc., and achieve low production cost and excellent process Simple, valence-reducing effect

Inactive Publication Date: 2006-07-19
NANKAI UNIV
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  • Application Information

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Problems solved by technology

The operation is cumbersome, the reaction time required is long, and the cost of synthetic products is high

Method used

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  • Method for preparing anode material vanadium lithium fluorinated phosphate of lithium ion secondary battery
  • Method for preparing anode material vanadium lithium fluorinated phosphate of lithium ion secondary battery
  • Method for preparing anode material vanadium lithium fluorinated phosphate of lithium ion secondary battery

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Embodiment 1

[0019] Take 9.094g of vanadium pentoxide in a beaker, add 900ml of 10% aqueous hydrogen peroxide solution to it, and stir vigorously to form V 2 o 5 ·nH 2 O water sol, let it stand for three days; add the weighed ammonium dihydrogen phosphate 11.503g, lithium fluoride 2.594g, and high surface carbon 1.800g to the previous V 2 o 5 ·nH 2 In O hydrogel, after stirring vigorously for 6 hours, dry it in an oven at 100°C for 6 hours; take it out, press it at 25MPa, and pre-fire it at 300°C for 4 hours under the protection of high-purity argon; take it out and re- Press into tablets, bake at 550°C for 3 hours under the protection of high-purity argon, and cool naturally to room temperature to obtain the product LiVPO 4 F, the yield is above 99%.

[0020] Analyze the content of each element in the synthetic sample with ICP, the result is consistent with theory; By x-ray powder diffraction pattern (see figure 1 ) shows that the sample belongs to the triclinic system and is a sing...

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Abstract

The invention relates to a preparaiton method for vanadic lithium fluoride phosphate as anode material of lithium cell. Wherein, with low-temperature solid phase reaction, mixing the hydrogen peroxides solution and vanadic oxide to obtain hydrogel; using the ydrogel, ammonium monoacid phosphate, lithium fluoride and acetylene black to compose the predecessor of LiVPO4F; baking the predecessor at inertia gas to reduce V5+ into V3+ completely and obtain the LiVPO4F. This invention simplifies operation, reduces reaction temperature and time and cost. The product has well performance and application future.

Description

technical field [0001] The invention relates to a lithium ion secondary battery cathode material lithium vanadium phosphate fluoride (LiVPO 4 F) Preparation method. It is synthesized by a low-temperature solid-state method, and the lithium-ion battery cathode material LiVPO synthesized by this method 4 F, 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 relatively 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 cobalt oxide has been used in commercial lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455H01M4/58
CPCY02E60/12C01B25/455C01B25/45
Inventor 阎杰李宇展周震高学平卞锡奎
Owner NANKAI UNIV
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