Aluminum-doped lithium vanadium fluorophosphate/phosphatized graphene oxide composite material and preparation method thereof, and application in lithium ion battery

A technology of vanadium lithium fluorophosphate and composite materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electrical conductivity, and achieve the effects of improved electrical conductivity, high phase purity, and good crystal morphology

Pending Publication Date: 2020-12-01
福建巨电新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention effectively improves the problem of poor electrical conductivity of the lithium vanadium phosphate material, and improves the reversible specific capacity of the material

Method used

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  • Aluminum-doped lithium vanadium fluorophosphate/phosphatized graphene oxide composite material and preparation method thereof, and application in lithium ion battery
  • Aluminum-doped lithium vanadium fluorophosphate/phosphatized graphene oxide composite material and preparation method thereof, and application in lithium ion battery

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Embodiment 1

[0024] A preparation of vanadium lithium fluorophosphate composite positive electrode material and its application in lithium ion batteries, comprising the following steps:

[0025] 1) Add the graphene-containing suspension into DMF, and sequentially add lithium source, vanadium source, phosphorus source and aluminum source to 60 ml of graphene suspension in a stoichiometric ratio of 1:1:1:0.2 , after stirring with a magnetic stirrer for 15 min, the mixed solution was transferred to a polytetrafluoroethylene liner and heated in a microwave at 350 °C for 30 min;

[0026] 2) After the reaction, the solution was centrifuged and washed, and the precipitate was collected and dried in a drying oven;

[0027] 3) Mix and grind the lithium vanadium phosphate / graphene precursor, fluorine source, phosphorus source, and molten salt at a mass ratio of 1:1:1:10, and calcinate at 350 °C for 2 h in an inert gas atmosphere, then 750 °C Calcination at ℃ for 5 h;

[0028] 4) The collected prod...

Embodiment 2

[0032] A preparation of vanadium lithium fluorophosphate composite positive electrode material and its application in lithium ion batteries, comprising the following steps:

[0033] 1) Add the graphene-containing suspension into DMF, and sequentially add lithium source, vanadium source, phosphorus source and aluminum source to 70 ml of graphene suspension in a stoichiometric ratio of 1:1:1:0.5 , after stirring with a magnetic stirrer for 25 min, the mixed solution was transferred to a polytetrafluoroethylene liner and heated in a microwave at 250 °C for 45 min;

[0034] 2) After the reaction, the solution was centrifuged and washed, and the precipitate was collected and dried in a drying oven;

[0035] 3) Mix and grind the lithium vanadium phosphate / graphene precursor, fluorine source, phosphorus source, and molten salt at a mass ratio of 1:1:2:20, and calcinate at 400 °C for 2 h in an inert gas atmosphere, then 800 °C Calcination at ℃ for 3 h;

[0036] 4) The collected prod...

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Abstract

The invention discloses an aluminum-doped lithium vanadium fluorophosphate / phosphatized graphene oxide composite material and a preparation method thereof, and application in a lithium ion battery. The preparation method adopts a step-by-step process and comprises the following steps: (1) preparing a lithium vanadium phosphate / graphene composite material precursor by a microwave solvothermal method; (2) preparing an aluminum-doped lithium vanadium fluorophosphate / phosphatized graphene oxide composite material by a molten salt method; and (3) washing the sample, and carrying out freeze drying to obtain the pure-phase aluminum-doped lithium vanadium fluorophosphate / phosphatized graphene oxide composite material. According to the invention, the composite material can be obtained through one-time sintering, the used process is simple, the sample purity is high, graphene coating is uniform, the ionic and electronic conductivity of the composite material is obviously improved, and the assembled lithium ion battery has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium-ion batteries, and in particular relates to an aluminum-doped lithium fluorovanadium phosphate / phosphorized graphene oxide composite material, a preparation method thereof, and an application in lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used as energy systems in various electronic devices and electric vehicles due to their non-polluting, high specific energy, and long cycle life. At present, lithium-ion batteries have become a hot spot and focus of competing research in various countries. The cathode material is an important part of the lithium-ion battery. During the charging and discharging process of the lithium-ion battery, it provides the lithium required for the deintercalation of the positive and negative electrodes and the formation of the SEI film. Therefore, the development of a high-performance cathode material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 康美玲张劢吴彬杰杨德财
Owner 福建巨电新能源股份有限公司
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