MXene/bimetal oxide composite material, preparation method thereof and lithium ion battery negative electrode material

A bimetallic oxide, composite material technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., to achieve the effects of easy control, strong interaction, good structural stability and uniformity

Active Publication Date: 2018-09-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical Li-ion storage capacity of MXene is only 320mAh

Method used

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  • MXene/bimetal oxide composite material, preparation method thereof and lithium ion battery negative electrode material
  • MXene/bimetal oxide composite material, preparation method thereof and lithium ion battery negative electrode material
  • MXene/bimetal oxide composite material, preparation method thereof and lithium ion battery negative electrode material

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preparation example Construction

[0032] The invention provides the preparation method of MXene / double metal oxide composite material, and this method comprises the steps:

[0033] (1) Preparation of a few-layer transition metal carbon / nitride (MXene) film: first prepare a powdery multilayer transition metal carbon / nitride, and then prepare a few-layer transition metal carbon / nitride film by vacuum filtration.

[0034] (2) Preparation of precursor solution:

[0035] Mix a few-layer transition metal carbon / nitride (MXene) film with acetylacetonate metal salt, and obtain a uniform mixed powder by grinding, add a bibenzyl ether solvent to dissolve and disperse the mixed powder, and add a surfactant, place Stir on a magnetic stirrer to obtain a reacted precursor solution;

[0036] (3) Synthesis of composite materials by in-situ pyrolysis method:

[0037] The obtained precursor solution was magnetically stirred, and N 2 Gas, set the flow rate of the gas, and the time of feeding the gas is 30 minutes to ensure th...

Embodiment 1

[0051] A preparation method for constructing a negative electrode material of a composite lithium-ion battery with transition metal carbon / nitride (MXene) and a double metal oxide, specifically comprising the following steps:

[0052] (1) Add 1g of lithium fluoride (LiF) powder to 20ml, 9mol / L hydrochloric acid (HCl) of hydrochloric acid (HCl), stir magnetically at 25°C, the rotation speed is 300r / min, and the stirring time is 20-30min. get a homogeneous mixture;

[0053] (2) Slowly add 1g of titanium aluminum carbon (Ti 3 AlC 2 ) raw materials, control the reaction temperature to rise to 35°C, continue to stir the reaction for 25 hours, and obtain the black multi-layer transition metal carbon / nitride (MXene) precipitate by centrifuging the solution obtained from the reaction at 5000 rpm, and alternately use ethanol and water Washing method Ultrasonic centrifugal washing to PH = 7, the rotation speed is 5000r / min, the time is 5min, the number of washings is 2-3 times, and th...

Embodiment 2

[0062] A preparation method for constructing a negative electrode material of a composite lithium-ion battery with transition metal carbon / nitride (MXene) and a double metal oxide, specifically comprising the following steps:

[0063] (1) Add 2g of lithium fluoride (LiF) powder to 40ml, 9mol / L hydrochloric acid (HCl) of hydrochloric acid (HCl), stir magnetically at 20°C, the speed is 300r / min, and the stirring time is 30min to obtain a uniform the mixture;

[0064] (2) Slowly add 2g of titanium aluminum carbon (Ti 3 AlC 2 ) raw materials, control the reaction temperature to rise to 35°C, continue to stir the reaction for 24 hours, and obtain the black multi-layer transition metal carbon / nitride (MXene) precipitate by centrifuging the solution obtained from the reaction at 5000 rpm, and alternately use ethanol and water Washing method Ultrasonic centrifugal washing to PH = 7, the rotation speed is 6000r / min, the time is 4min, the number of washings is 3 times, and the cleaned...

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Abstract

The invention discloses an MXene / bimetal oxide composite material, a preparation method thereof and a lithium ion battery negative electrode material, and belongs to the technical field of preparationof a lithium battery electrode material. The preparation method comprises the steps of firstly, uniformly mixing a transition metal carbon / nitride thin film and two types of acetylacetone metal salts, and dissolving the mixture in a benzyl ether solvent to obtain a precursor solution; secondly, achieving pyrolysis of the acetylacetone metal salts by an in-situ pyrolysis method, and growing a bimetal oxide on a surface of the transition metal carbon / nitride thin film; and finally, obtaining the MXene / bimetal oxide composite material after ultrasound centrifugal cleaning on a mixed liquid of n-hexane and alcohol. When the composite material is applied to the lithium ion battery negative electrode material, relatively good structural stability and uniformly are shown; and through electrochemical performance test, the composite electrode has relatively high energy density, cycle stability and rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode material preparation, in particular to an MXene / double metal oxide composite material, a preparation method thereof, and a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are widely used in mobile consumer electronics such as mobile phones and digital cameras, as well as energy supply components for pure electric and plug-in hybrid vehicles. At present, commercial lithium batteries can no longer meet the urgent needs of consumers for energy storage devices with high energy density and high power density. The development of high-performance lithium-ion batteries is imminent. So far, the commercial lithium battery anode material is graphite, and its theoretical specific capacity is as low as 372mA h g -1 , hindering the further development of lithium batteries. Therefore, finding new high-performance anode materials is crucial...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/52H01M4/624H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张炳森李浩杰鲁铭韩文娟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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