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Lithium vanadium phosphate/carbon composite positive electrode material and preparation method thereof

A composite cathode material, phosphate technology, applied in battery electrodes, electrical components, electrochemical generators and other directions, can solve the problems of unsuitability for industrial production, long solid-phase sintering time, poor electrochemical performance, etc., to shorten the solid-phase Sintering time, perfect crystal growth and good crystallinity

Active Publication Date: 2019-04-09
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ou etc. to NH 4 NO 3 Synthesis of Submicron Porous Li as Additives by Sol-Gel Combustion Method 3 V 2 (PO 4 ) 3 / C composite material has excellent electrochemical properties, but the sintering time of this method is 6 hours. If the sintering time is further shortened, for example, when the sintering time is 4 hours, the reaction will be incomplete, the crystallinity is poor, and the crystal form Incomplete, poor electrochemical performance
Therefore, this technology has a relatively long final solid-state sintering time, and the synthesis cycle is too long, which is not suitable for industrial production.

Method used

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  • Lithium vanadium phosphate/carbon composite positive electrode material and preparation method thereof
  • Lithium vanadium phosphate/carbon composite positive electrode material and preparation method thereof
  • Lithium vanadium phosphate/carbon composite positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1 prepares Li 3 V 2 (PO 4 ) 3 / C Composite Cathode Material

[0061] a. Dissolve 23.641g of citric acid in 200g of deionized water, then add 3.509g of NH 4 VO 3 , 1.888gLiOH·H 2 O and 5.176gNH 4 h 2 PO 4 Add it to the citric acid solution, stir to dissolve and add 0.931g ethylene glycol and 1.801g NH 4 NO 3 , Then the solution was stirred and evaporated at 80°C for 1.5h to a dark blue gel.

[0062] b. Transfer the dark blue gel to a crucible, put it in a muffle furnace heated to 850°C in advance, and burn it for 20 minutes to obtain black Li 3 V 2 (PO 4 ) 3 / C precursor.

[0063] c. According to the fact that the organic carbon source is 10% of the weight of the black precursor, weigh the organic carbon source citric acid, pulverize and mix the precursor and the organic carbon source, and put it under the protection of an inert gas for calcination at 850°C for 2 hours, and then naturally Cool to get Li 3 V 2 (PO 4 ) 3 / C composite cathode ...

Embodiment 2

[0066] On the basis of Example 1, only the calcination time of step c was changed to 3 hours to obtain Li 3 V 2 (PO 4 ) 3 / C composite cathode material. Li prepared in this example 3 V 2 (PO 4 ) 3 The X-ray diffraction patterns of / C composite cathode materials are listed in the attached figure 2 , it can be seen from the figure that there is no impurity phase in the product, and it is a pure phase of monoclinic Li 3 V 2 (PO 4 ) 3 .

Embodiment 3

[0068] On the basis of Example 1, only the calcination time of step c was changed to be 4 hours, and Li 3 V 2 (PO 4 ) 3 / C composite cathode material. Li prepared in this example 3 V 2 (PO 4 ) 3 The X-ray diffraction patterns of / C composite cathode materials are listed in the attached image 3 , it can be seen from the figure that there is no impurity phase in the product, and it is a pure phase of monoclinic Li 3 V 2 (PO 4 ) 3 .

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Abstract

The present invention relates to a Li3V2(PO4)3 / C composite positive electrode material and a preparation method thereof, and relates to the field of preparation of the Li3V2(PO4)3 / C composite positiveelectrode material. The preparation method of the Li3V2(PO4)3 / C material comprises following steps: weighing lithium-containing, vanadium-containing, phosphate radical-containing, and nitrate radical-containing compounds and an organic compound; dissolving the compounds in water, and then heating and stirring to obtain a dark blue gel; placing the gel in an environment previously heated to 750-900 DEG C, and burning for 10-40 minutes to obtain a black precursor; and finally, adding an organic carbon source for mixing with the precursor, placing under 700-900 DEG C under protection of AN insert gas for 2-4 hours, and then naturally cooling to obtain a Li3V2(PO4)3 / C positive electrode material. The obtained Li3V2(PO4)3 / C positive electrode material has good electrochemical performance, short process flow, low cost and easy industrial production.

Description

technical field [0001] The invention relates to lithium vanadium phosphate / carbon composite cathode material and a preparation method thereof, belonging to Li 3 V 2 (PO 4 ) 3 / C composite cathode material preparation field. Background technique [0002] Due to the advantages of high specific energy, high working voltage, long cycle life, no memory effect and less pollution, lithium-ion batteries have been widely used, including power batteries. However, with the rapid development of new energy vehicles, people have put forward higher requirements on the performance of lithium-ion batteries, hoping to find more potential electrode cathode materials. The energy density of the positive electrode material is determined by the specific capacity and discharge voltage of the material, while the power density is determined by the rate performance of the material. Therefore, it has high specific capacity (197mAh / g), high platform voltage (3.6~4.5V vs. Li / Li + ) and monoclinic L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 李娜丽崔旭梅张雪峰同艳维弋大为
Owner PANZHIHUA UNIV