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A composite cathode material for a magnesium-lithium dual-ion battery, its preparation method, application, and battery system

A composite positive electrode material and nano-composite material technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of restricting the development of magnesium-ion batteries, poor cycle stability, and low battery stable cycle capacity and other issues, to achieve the effect of improving stable cycle capacity, cycle stability, and maintaining structural integrity

Active Publication Date: 2021-09-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stable cycle capacity of the battery is low, and the poor cycle stability still restricts the development of magnesium-ion batteries.

Method used

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  • A composite cathode material for a magnesium-lithium dual-ion battery, its preparation method, application, and battery system
  • A composite cathode material for a magnesium-lithium dual-ion battery, its preparation method, application, and battery system
  • A composite cathode material for a magnesium-lithium dual-ion battery, its preparation method, application, and battery system

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preparation example Construction

[0032] The present invention also provides a preparation method of the magnesium-lithium dual-ion battery composite positive electrode material described in the above technical solution, comprising the following steps:

[0033] Graphene oxide, water, Na 3 VO 4 After mixing with thioacetamide, carry out hydrothermal reaction to obtain VS 4 / rGO nanocomposites;

[0034] will the VS 4 After the rGO nanocomposite material, aniline and HCl solution are mixed, the HCl solution of ammonium persulfate is added to carry out a polymerization reaction to obtain the magnesium-lithium dual-ion battery composite cathode material.

[0035]The present invention will graphene oxide, water, Na 3 VO 4 After mixing with thioacetamide, carry out hydrothermal reaction to obtain VS 4 / rGO nanocomposites.

[0036] In the present invention, the Na 3 VO 4 The molar ratio to thioacetamide is preferably 1:5 to 1:6.

[0037] In the present invention, the graphene oxide and Na 3 VO 4 The mass r...

Embodiment 1

[0058] Step 1: Sample Preparation

[0059] Hydrothermal Synthesis VS 4 / rGO:

[0060] Weigh 75 mg of graphene oxide powder in 150 mL of deionized water, and ultrasonically disperse until the solution is golden yellow. Then sequentially add Na with a metering ratio of 1:5 3 VO 4 (2.0125g) and thioacetamide, stirred for 1h. The above solution was transferred to a hydrothermal reactor and reacted at 160°C for 24h. After the reaction, wash with deionized water and ethanol alternately for 4 to 6 times, and vacuum dry at 60°C for 12 hours to obtain VS 4 / rGO black powder, wherein rGO carbon content is about 2.5wt.%.

[0061] In situ polymerization of PANI in VS 4 / rGO:

[0062] Sequentially weigh a certain amount of VS 4 / rGO powder and aniline (mass ratio 4:1) were ultrasonically dispersed in 0.1M HCl solution at 5°C for 1 hour. The dispersed solution was stirred in an ice-water bath, and a 0.1M HCl solution of ammonium persulfate was added dropwise to start the polymeriz...

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Abstract

The invention provides a composite cathode material for a magnesium-lithium dual-ion battery, a preparation method and application thereof, and a battery system, belonging to the field of magnesium-ion batteries. In the present invention, the polyaniline layer has a protective effect on the composite positive electrode material, and the PANI-coated VS 4 / rGO has a higher conductivity and a more complete structure, which is conducive to the realization of charge and discharge under high current density; the PANI conductive layer does not participate in the electrochemical reaction, and is coated on the VS 4 The surface improves its conductivity, which can well adapt to the charge and discharge process under high current density. At the same time, the PANI layer reduces the core VS 4 Active material loss during charge and discharge, thereby maintaining structural integrity; the PANI layer enables VS 4 Can be better adapted to Mg 2+ and Li + The volume change caused by intercalation and deintercalation reduces the loss of active materials on the current collector, thereby significantly improving the stable cycle capacity of cathode materials.

Description

technical field [0001] The invention belongs to the technical field of magnesium-ion batteries, and in particular relates to a magnesium-lithium dual-ion battery composite cathode material, a preparation method and application thereof, and a battery system. Background technique [0002] In the "post-lithium-ion battery" era, lithium-ion batteries are still the main body of practical secondary batteries. However, in recent years, safety accidents caused by lithium-ion batteries have continued, and lithium resources are very limited, prompting people to turn their attention to alternative lithium-ion batteries. A new type of safe and reliable secondary battery for batteries. Magnesium, as a metal element with abundant reserves, has high safety, low cost and capacity equivalent to lithium. Therefore, magnesium-ion batteries and magnesium-lithium dual-ion batteries used to solve the defects of magnesium-ion batteries have attracted the attention of researchers. [0003] Althou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525H01M10/054B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 卢惠民景鹏程杨文文曹媛
Owner BEIHANG UNIV