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Carbon fiber-loaded magnesium oxide particle crosslinked nanosheet array composite material and its preparation method and application

A technology of magnesium oxide particles and nanosheet arrays, applied in electrochemical generators, structural parts, electrical components, etc., can solve problems such as difficulty in playing a three-dimensional carrier role, and achieve a reduction in limited current density, low polarization voltage, and enhanced affinity. the effect of

Active Publication Date: 2021-01-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since there are no lithium-philic sites on the surface of the carbon fiber skeleton, lithium metal is almost only deposited on the outer surface of the carbon fiber skeleton, making it difficult to play the role of its three-dimensional carrier.

Method used

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  • Carbon fiber-loaded magnesium oxide particle crosslinked nanosheet array composite material and its preparation method and application
  • Carbon fiber-loaded magnesium oxide particle crosslinked nanosheet array composite material and its preparation method and application
  • Carbon fiber-loaded magnesium oxide particle crosslinked nanosheet array composite material and its preparation method and application

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Effect test

Embodiment 1

[0041] The 2cm*3cm carbon fibers were cleaned with acetone, ethanol and deionized water in an ultrasonic cleaner for 15 minutes, and then placed in an oven at 60°C for 24 hours to dry. The dry and clean carbon fiber is subjected to vacuum plasma surface treatment for 20 minutes to obtain a hydrophilic carbon fiber with a large amount of oxygen-containing groups on the surface. The hydrophilic carbon fiber is used as the working electrode, the platinum electrode is used as the counter electrode / reference electrode, and Mg is prepared with deionized water. 2+ The concentration is 0.5mol L -1 Magnesium nitrate solution is used as the electrolyte, at room temperature 25 ℃, with 4mA cm -2 The constant current cathodic deposition was carried out at the current density to obtain the carbon fiber supported magnesium hydroxide composite material. After cleaning with deionized water, heat to 400°C in the air, and heat treatment for 1 h to obtain carbon cloth-supported magnesium oxide ...

Embodiment 2

[0047] The 2cm*3cm carbon fibers were cleaned with acetone, ethanol and deionized water in an ultrasonic cleaner for 15 minutes, and then placed in an oven at 60°C for 24 hours to dry. The dry and clean carbon fiber is subjected to vacuum plasma surface treatment for 20 minutes to obtain a hydrophilic carbon fiber with a large amount of oxygen-containing groups on the surface. The hydrophilic carbon fiber is used as the working electrode, the platinum electrode is used as the counter electrode / reference electrode, and Mg is prepared with deionized water. 2+ The concentration is 0.3mol L -1 Magnesium nitrate solution is used as the electrolyte, at room temperature 25 ℃, with 4mA cm -2 The constant current cathodic deposition was carried out at the current density to obtain the carbon fiber supported magnesium hydroxide composite material. After cleaning with deionized water, heat to 400° C. in air, and heat treatment for 1 h to obtain a carbon cloth-loaded magnesium oxide com...

Embodiment 3

[0049] The 2cm*3cm carbon fibers were cleaned with acetone, ethanol and deionized water in an ultrasonic cleaner for 15 minutes, and then placed in an oven at 60°C for 24 hours to dry. The dry and clean carbon fiber is subjected to vacuum plasma surface treatment for 20 minutes to obtain a hydrophilic carbon fiber with a large amount of oxygen-containing groups on the surface. The hydrophilic carbon fiber is used as the working electrode, the platinum electrode is used as the counter electrode / reference electrode, and Mg is prepared with deionized water. 2+ The concentration is 0.4mol L -1 Magnesium nitrate solution is used as the electrolyte, at room temperature 25 ℃, with 4mA cm -2 The constant current cathodic deposition was carried out at the current density to obtain the carbon fiber supported magnesium hydroxide composite material. After cleaning with deionized water, heat to 400° C. in air, and heat treatment for 1 h to obtain a carbon cloth-loaded magnesium oxide com...

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Abstract

The invention discloses a carbon fiber loaded magnesium oxide particle cross-linked nanosheet array composite material and a preparation method thereof, and application of carbon fiber loaded magnesium oxide particle cross-linked nanosheet array composite material as lithium metal battery anode framework material in preparation of the anode of the lithium metal battery. The method comprises the following steps of: loading magnesium hydroxide nanosheets on carbon fibers in an electrodeposition mode, and performing heat treatment on the carbon fibers on this basis to obtain a lithium-philic magnesium oxide particle cross-linked nanosheet array. The lithium-philic magnesium oxide particle cross-linked nanosheet array is taken as the lithium metal battery anode framework material to assemble with a metal lithium sheet to form a battery for electrochemical deposition to deposit the lithium metal to obtain the anode of the metal battery. The anode of the lithium metal battery obtained afterdepositing can still show a low polarization voltage, high deposition-dissolution efficiency and long life, is excellent in electrical properties and has wide application prospects.

Description

technical field [0001] The method relates to a novel negative electrode material for lithium metal batteries, in particular to a carbon fiber-supported magnesium oxide particle cross-linked nanosheet array composite material, a preparation method thereof, and its application as a negative electrode skeleton material for lithium metal batteries in the preparation of lithium metal battery negative electrodes. Background technique [0002] Lithium-ion batteries are widely used in fields such as portable electronic devices and electric vehicles. However, in recent years, commercialized graphite anodes for lithium-ion batteries (theoretical specific capacity of 372 mA h g -1 ) can provide an energy density that is getting closer and closer to its theoretical limit (theoretical specific energy 350 W h kg -1 ), it is difficult to meet the increasing demand for energy density of energy storage systems in today's society. [0003] Among the many candidates for anode materials, lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 夏新辉刘博王秀丽涂江平
Owner ZHEJIANG UNIV
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