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A kind of flaky oxygen-deficient lithium vanadate positive electrode material and preparation method thereof

A cathode material, lithium vanadate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of large irreversible capacity loss, complex post-processing steps, large resistance between large particles, etc., to improve electronic conductivity and The effect of lithium ion diffusivity, low electrode production cost, and easy large-scale production

Active Publication Date: 2020-06-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of nanostructuring and carbon-encapsulating powders has many negative effects, such as low tap density, large irreversible capacity loss, and high resistance between large particles, etc.
Furthermore, existing methods often involve complex post-processing steps or expensive chemicals

Method used

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  • A kind of flaky oxygen-deficient lithium vanadate positive electrode material and preparation method thereof
  • A kind of flaky oxygen-deficient lithium vanadate positive electrode material and preparation method thereof
  • A kind of flaky oxygen-deficient lithium vanadate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Dissolve 2.632g ammonium vanadate and 0.765g lithium acetate in 5g N,N dimethylformamide according to the stoichiometric ratio, and add 0.5ml HNO 3 and 5.673g C 2 h 2 o 4 2H 2 O is complexed and adjusted, stirring continuously until it is completely dissolved to form a solution A; then 2g of polyacrylonitrile with a molecular weight of 50000 and 4g of a molecular weight of 150000 is dissolved in 30g N, N dimethylformamide to form a solution B; the solution A is slowly Add dropwise to solution B and stir until evenly mixed.

[0029] (2) Prepare the lithium vanadate precursor fiber by using the general electrospinning method from the mixed solution. The feeding speed is 0.5ml / h, the voltage is 24kV, the humidity is controlled at 40%, and the temperature is kept at 25°C. The distance between them is 15cm;

[0030] (3) The precursor fiber was directly calcined at 500° C. in air for 3 hours to obtain a surface-modified sheet-like oxygen-deficient lithium vanadate ca...

Embodiment 2

[0033] (1) Dissolve 1.316g of ammonium vanadate and 0.383g of lithium acetate in 3g of N,N dimethylacetamide according to the stoichiometric ratio, and add 0.3ml of HNO 3 and 2.837g C 2 h 2 O4·2H 2 O is complexed and adjusted, stirring continuously until it is completely dissolved to form a solution; then 1g of polyacrylonitrile with a molecular weight of 50000 and 4g of a molecular weight of 150000 is dissolved in 30g of N,N dimethylacetamide to form a solution of B; the solution of A is slowly Add dropwise to solution B and stir until evenly mixed.

[0034] (2) Use the general electrospinning method to prepare the lithium vanadate precursor fiber from the mixed solution, such as the feeding speed is 0.5ml / h, the voltage is 20kV, the humidity is controlled at 40%, the temperature is kept at 25°C, the nozzle and the receiver The distance between them is 15cm;

[0035] (3) The precursor fiber was directly calcined at 400° C. in air for 5 hours to obtain a surface-modified s...

Embodiment 3

[0038] (1) Dissolve 5.264g of ammonium vanadate and 1.53g of lithium acetate in 10g of acetonitrile according to the stoichiometric ratio, and add 1ml of HNO 3 and 11.346g C 2 h 2 O4·2H 2 O is complexed and adjusted, stirring continuously until completely dissolving to form A solution; then 4g of molecular weight is 50000 and 8g of polyacrylonitrile with molecular weight of 150000 is dissolved in 55g of acetonitrile to form B solution; A solution is slowly added dropwise to B solution, Stir until well combined.

[0039] (2) Prepare the lithium vanadate precursor fiber by using the general electrospinning method from the mixed solution. The feeding speed is 0.5ml / h, the voltage is 24kV, the humidity is controlled at 40%, and the temperature is kept at 25°C. The distance between them is 15cm;

[0040] (3) The precursor fiber was directly calcined at 500° C. in air for 1 hour to obtain a surface-modified sheet-like oxygen-deficient lithium vanadate cathode material.

[0041]...

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Abstract

The invention belongs to the technical field of a lithium ion battery positive electrode material, and particularly relates to a sheet-shaped lithium vanadate positive electrode material and a preparation method thereof. By forming LiV3O<7.9> with sheet-shaped morphology and oxygen deficiency and forming rapid ion conductor Li<0.3>V2O5 on a surface of the LiV3O<7.9>, the electron conductivity and the ion conductivity of the lithium vanadate material are improved, and the lithium vanadate material is used as a lithium ion battery positive electrode material with high rate and cycle properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery positive electrode materials, and in particular relates to a sheet-shaped lithium vanadate positive electrode material and a preparation method thereof. Background technique [0002] Layered monoclinic lithium vanadium oxide (LiV 3 o 8 ) has high specific energy, high operating voltage, and long cycle life, and is expected to become an excellent cathode material for lithium-ion batteries. However, its low electronic conductivity (~10 -6 Scm -1 ) and low lithium ion diffusion coefficient (10 -13 cm 2 S -1 ) lead to low charge-discharge Coulombic efficiency and poor rate performance of the electrode. These problems are usually improved by reducing the size to nanoscale or improving synthesis methods such as spray pyrolysis, surface-coated carbon treatment, sol-gel method, hydrothermal synthesis, microwave synthesis, etc. However, the method of nanostructuring and carbon-encapsula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M10/0525
CPCH01M4/366H01M4/485H01M4/583H01M10/0525Y02E60/10
Inventor 景茂祥李井泉翟洪爱张骥沈湘黔
Owner JIANGSU UNIV
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