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Magnesium-lithium double-ion battery composite cathode material, preparation method and application thereof, and battery system

A composite positive electrode material and nanocomposite material technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the constraints on the development of magnesium ion batteries, low stable battery cycle capacity, and poor cycle stability And other issues

Active Publication Date: 2019-05-14
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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  • Magnesium-lithium double-ion battery composite cathode material, preparation method and application thereof, and battery system
  • Magnesium-lithium double-ion battery composite cathode material, preparation method and application thereof, and battery system
  • Magnesium-lithium double-ion battery composite cathode material, preparation method and application thereof, 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 cathode material described in the above technical scheme, which includes the following steps:

[0033] Combine graphene oxide, water, Na 3 VO 4 After mixing with thioacetamide, hydrothermal reaction is performed to obtain VS 4 / rGO nanocomposite materials;

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

[0035] The present invention combines graphene oxide, water, Na 3 VO 4 After mixing with thioacetamide, hydrothermal reaction is performed to obtain VS 4 / rGO nanocomposite materials.

[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 ...

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, stirring for 1h. Transfer the above solution to a hydrothermal reaction kettle and react at 160°C for 24 hours. After the reaction is over, 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, in which rGO carbon content is about 2.5wt.%.

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

[0062] Weigh a certain amount of VS in turn 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 placed in an ice water bath and stirred, and 0.1M HCl solution of ammonium persulfate was added dropwise to start the polyme...

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Abstract

The invention provides a magnesium-lithium double-ion battery composite cathode material, a preparation method and application thereof, and a battery system, and belongs to the field of magnesium ionbatteries. In the magnesium-lithium double-ion battery composite cathode material, a polyaniline layer has a protective effect on the composite cathode material, and PANI-coated VS4 / rGO is higher in conductivity and of a more complete structure, which is favorable for achieving charging and discharging under a large current density; a PANI conductive layer does not participate in electrochemical reaction, and coats the surface of VS4 to improve the conductivity of VS4, and can well adapt to the charging and discharging process under the high current density; meanwhile, the PANI layer reduces the loss of active substances in the core VS4 during charging and discharging, thus maintaining the structural integrity; and the PANI layer allows VS4 to better adapt to the volume change caused by the intercalation and deintercalation of Mg<2+> and Li<+>, and reduces the loss of the active substances on a current collector, thereby significantly increasing the stable cycle capacity of the cathodematerial.

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 mainstay of practical secondary batteries. However, in recent years, safety accidents caused by lithium-ion batteries and the limited lithium resources have prompted people to turn their attention to being able to replace lithium-ion. The battery is a new safe and reliable secondary battery. As a metal element with abundant reserves, magnesium has high safety, low cost and capacity equivalent to lithium. Therefore, magnesium-ion batteries and magnesium-lithium dual-ion batteries for solving the defects of magnesium-ion batteries have attracted the attention of researchers. [0003] Although magnesium ion batteries have many...

Claims

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Application Information

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Patent Type & Authority Applications(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
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