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A kind of ruthenium-doped lithium vanadium phosphate cathode material and preparation method thereof

A lithium vanadium phosphate and cathode material technology, applied in chemical instruments and methods, battery electrodes, phosphorus compounds, etc., can solve the problems of low material specific energy, poor stability and safety, poor electronic conductivity, etc., and achieve simple preparation process and process easy to control effects

Active Publication Date: 2019-12-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most common cathode materials on the market mainly include: lithium iron phosphate, nickel-cobalt-manganese ternary materials, lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide. Bad question
Among them, lithium vanadium phosphate material has the advantages of high energy density and good cycle stability, but the electronic conductivity of the material itself is poor, which limits the application and promotion of energy storage devices.

Method used

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  • A kind of ruthenium-doped lithium vanadium phosphate cathode material and preparation method thereof
  • A kind of ruthenium-doped lithium vanadium phosphate cathode material and preparation method thereof
  • A kind of ruthenium-doped lithium vanadium phosphate cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] The preparation method of ruthenium-doped lithium vanadium phosphate cathode material, the steps are as follows:

[0030] (1) Li in stoichiometric ratio 2 CO 3 (0.03mol), V 2 o 5 (0.02mol), NH 4 h 2 PO 4 (0.06mol), RuCl 3 (0.0004mol) is added in the ball mill jar, namely Li:V:P:Ru molar ratio is 3:2:3:0.02;

[0031] (2) adding lauric acid (0.09mol), using absolute ethanol as a solvent, milling for 6 hours in a high-energy ball mill, making it uniformly mixed to obtain a slurry;

[0032] (3) drying the obtained slurry at 60° C. for 12 hours to obtain a precursor;

[0033] (4) Under a nitrogen atmosphere, the precursor was pretreated at 350°C for 4 hours and heat-treated at 750°C for 8 hours to obtain an electrode material. The reaction mechanism involved is figure 1 shown.

[0034] In this example 1, nanometer-sized electrode materials are obtained by means of the micelle action of the surfactant lauric acid, which shortens the diffusion distance of lithium io...

Embodiment 2

[0036] The preparation method of ruthenium-doped lithium vanadium phosphate cathode material, the steps are as follows:

[0037] (1) Reaction raw materials lithium acetate (0.06mol), ammonium metavanadate (0.0398mol), (NH 4 ) 2 HPO 4 (0.06mol), RuO 2 (0.0002mol) into the ball mill tank, that is, the Li:V:P:Ru molar ratio is 3:2:3:0.01;

[0038] (2) Add surfactant myristic acid (ratio of amount to lithium acetate substance is 3:3.5), use absolute ethanol as solvent, ball mill for 6 hours by high-energy ball mill, make it mix uniformly, obtain slurry;

[0039] (3) drying the slurry at 60° C. for 12 hours to obtain a precursor of ruthenium-doped lithium vanadium phosphate;

[0040] (4) Finally, the mixture was pretreated at 350° C. for 4 hours and heat-treated at 900° C. for 6 hours under an argon atmosphere to obtain an electrode material.

[0041] The samples in Example 2 were analyzed and tested for their morphology and electrochemical performance, and the results showed ...

Embodiment 3

[0043] The preparation method of ruthenium-doped lithium vanadium phosphate cathode material, the steps are as follows:

[0044] (1) Reaction raw material lithium hydroxide (0.06mol), V 2 o 5 (0.0196mol), H 3 PO 4 (0.06mol), RuCl 3 (0.0008mol) into the ball mill tank, that is, the molar ratio of Li:V:P:Ru is 3:2:3:0.04;

[0045] (2) According to the ratio of the amount of the surfactant oleic acid to the lithium hydroxide substance being 3:2.5, add a surfactant, use absolute ethanol as a solvent, and mill it with a high-energy ball mill for 6 hours to make it evenly mixed to obtain a slurry;

[0046] (3) drying at 60°C for 12 hours to obtain a precursor;

[0047] (4) The precursor is pretreated at 350° C. for 4 hours and heat-treated at 800° C. for 10 hours under a hydrogen atmosphere to obtain an electrode material.

[0048] The samples in Example 3 were analyzed and tested for their morphology and electrochemical properties, and the results showed that the prepared sam...

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Abstract

The invention relates to a ruthenium-doped lithium vanadium phosphate positive electrode material and a preparation method thereof. The preparation method comprises the steps of (1) adding a lithium source, a vanadium source, a phosphorus source and a ruthenium source to a ball mill tank at the mass ratio of 3:2:3:(0.01-0.04); (2) adding a surfactant to the ball mill tank at the mass ratio of the surfactant to the lithium source being 3:(2.0-3.5) and carrying out ball-milling employing ethanol as a solvent to form slurry; (3) drying the slurry at 60 DEG C to obtain a precursor; and (4) putting the precursor into a muffle furnace under gas protection, carrying out pretreatment at 350 DEG C for 4h and carrying out high-temperature calcination at 700-900 DEG C for 6-12h to prepare the ruthenium-doped lithium vanadium phosphate positive electrode material. The obtained material is on nanoscale, the diffusion distances of lithium ions are shortened and the electrochemical properties of the material are improved. The preparation technology is simple, the process is easy to control and the method is suitable for massive industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a ruthenium-doped lithium vanadium phosphate cathode material and a preparation method thereof. Background technique [0002] The demand for energy in today's society is increasing, and traditional energy sources pollute the environment. The society urgently needs a new type of clean energy. As an energy storage device, lithium-ion batteries are favored by researchers all over the world for their safety, stability, cleanliness, high specific energy, and good cycle life. Since the first commercial lithium-ion batteries came out, in recent years To get in-depth research and development. At present, it has been widely used in mobile electronic equipment, electric vehicles and large energy storage equipment. [0003] Positive and negative electrode materials are an important part of lithium-ion batteries, and they are also the key and core of lithium-ion batteries, which de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825Y02E60/10
Inventor 窦辉张存良张校刚聂平李洪森董升阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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