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A kind of preparation method of lithium ion cathode material nano δ-vopo4

A cathode material, lithium ion technology, applied in the field of new energy material preparation, can solve problems such as poor ring performance and specific capacity loss

Active Publication Date: 2019-10-22
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the promotion process of lithium-ion batteries, various problems have also been encountered. One important problem is that its ring performance is poor. In the field of smart phones, the use time of mobile phones generally does not exceed two years, and the charging times After more than 500 times, the specific capacity will be relatively large loss

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  • A kind of preparation method of lithium ion cathode material nano δ-vopo4
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  • A kind of preparation method of lithium ion cathode material nano δ-vopo4

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Embodiment 1

[0025] The lithium ion cathode material nano δ-VOPO of the present embodiment 4 The preparation method, the steps are as follows:

[0026] (1) Add 1.5g vanadium sulfate V 2 (SO 4 ) 3 Add 150mL of deionized water, stir strongly for 2 hours to fully dissolve, and prepare a homogeneous solution with a concentration of 0.01 g / mL;

[0027] (2) Slowly add a mixed solution of 10mL 37.5% hydrogen peroxide and 3.5mL 85% phosphoric acid into the above solution to obtain a mixed system;

[0028] (3) Transfer the above mixed system to a 200mL tetrafluoroethylene reactor for hydrothermal reaction at 170°C for 48h;

[0029] (4) After the reaction is over, centrifugally filter the yellow precipitate obtained in step (3), keep it in the muffle furnace at 600°C for 2 hours, and take it out after cooling with the calciner;

[0030] (5) Using wet grinding, the product obtained in step (4) was ground in absolute ethanol for 12 hours, dissolved in deionized water, ultrasonicated for 9 hours, ...

Embodiment 2

[0035] The lithium ion cathode material nano δ-VOPO of the present embodiment 4 The preparation method, the steps are as follows:

[0036] (1) Add 0.75g vanadium sulfate V 2 (SO 4 ) 3 Add 150mL of deionized water, stir strongly for 2 hours to fully dissolve, and prepare a homogeneous solution with a concentration of 0.005 g / mL;

[0037] (2) Slowly add a mixed solution of 10mL 37.5% hydrogen peroxide and 3mL 85% phosphoric acid into the above solution to obtain a mixed system;

[0038] (3) Transfer the above mixed system to a 200mL tetrapolyethylene fluoride reactor for hydrothermal reaction at 160°C for 50h;

[0039] (4) After the reaction is over, centrifugally filter the yellow precipitate obtained in step (3), keep it in a muffle furnace with a heating rate of 5°C / min at 550°C for 3.5h, and take it out after cooling with the calciner;

[0040] (5) Using wet grinding, the product obtained in step (4) was ground in absolute ethanol for 10 hours, dissolved in deionized wa...

Embodiment 3

[0042] The lithium ion cathode material nano δ-VOPO of the present embodiment 4 The preparation method, the steps are as follows:

[0043] (1) Add 3g vanadium sulfate V 2 (SO 4 )3 Add 150mL of deionized water, stir strongly for 2 hours to fully dissolve, and prepare a homogeneous solution with a concentration of 0.02 g / mL;

[0044] (2) Slowly add a mixed solution of 10mL 37.5% hydrogen peroxide and 4.5mL 85% phosphoric acid into the above solution to obtain a mixed system;

[0045] (3) Transfer the above mixed system to a 200mL tetrapolyethylene fluoride reactor for hydrothermal reaction at 180°C for 45h;

[0046] (4) After the reaction is over, centrifugally filter the yellow precipitate obtained in step (3), keep it in a muffle furnace with a heating rate of 5°C / min at 650°C for 1.5h, and take it out after cooling with the calciner;

[0047] (5) Using wet grinding, the product obtained in step (4) was ground in absolute ethanol for 11 hours, dissolved in deionized water,...

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Abstract

The invention discloses a method for preparing a lithium ion positive electrode material nano-delta-VOPO4. The method comprises the following steps: adding vanadium sulfate V2(SO4)3 into deionized water, and performing strong magnetic stirring to fully dissolve the vanadium sulfate in order to prepare a vanadium sulfate solution; slowly adding a hydrogen peroxide and phosphoric acid mixed solutioninto the vanadium sulfate solution to obtain a mixed solution; adding the mixed solution into a polytetrafluoroethylene reaction kettle, and performing a hydrothermal reaction; centrifuging and filtering the obtained yellow precipitate after the reaction ends, performing high-temperature calcination in a muffle furnace, cooling the muffle furnace, and taking out the calcined yellow precipitate; and grinding the obtained product in anhydrous ethanol through wet grinding, adding the obtained ground nano-delta-VOPO4 into deionized water, and performing ultrasonication, suction filtration, washing and drying treatment to obtain the target product. The lithium ion positive electrode material prepared in the invention has excellent delta-VOPO4 microstructure, and the unique layered structure ofthe material provides an idea for improving the cycle performances of the cathode material of the lithium ion positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a high cycle performance lithium-ion battery positive electrode material nano-δ-VOPO 4 method of preparation. Background technique [0002] Lithium-ion batteries have been widely used in laptops, mobile phones, cameras, etc. The field of mobile devices, such as mobile devices, has been gradually replacing traditional energy sources. However, in the promotion process of lithium-ion batteries, various problems have also been encountered. One important problem is that its ring performance is poor. In the field of smart phones, the use time of mobile phones generally does not exceed two years, and the charging times After more than 500 times, the specific capacity will be relatively large loss. Contents of the invention [0003] Aiming at the problems existing in the prior art, the present invention provides a lithium ion cathode material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00C01B25/372C01P2002/72C01P2004/03C01P2006/40H01M4/5825H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 陈泽华高雨卢亮
Owner HENAN POLYTECHNIC UNIV