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MXene/metal phosphide composite material, and anode material and preparation and application thereof

A metal phosphide, composite material technology, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve the problems of reducing battery capacity and life, electrode material volume change, electrode pulverization, etc., to improve energy density, good Stability and collapse prevention effect

Active Publication Date: 2020-05-19
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material has poor conductivity. During the electrochemical reaction, the volume of the electrode material changes seriously, which easily causes electrode pulverization, thereby reducing the capacity and life of the battery.

Method used

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  • MXene/metal phosphide composite material, and anode material and preparation and application thereof
  • MXene/metal phosphide composite material, and anode material and preparation and application thereof
  • MXene/metal phosphide composite material, and anode material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Weigh 1g ferric nitrate powder and 10g Ti respectively 3 C 2 Put the powder into a polytetrafluoroethylene reactor, add 20ml of deionized water to dissolve, mix and stir for 10 hours; then put it in an oven at 80°C for hydrothermal reaction, the reaction time is 8 hours; after the reaction, perform suction filtration to obtain a solid and dry it. get Ti 3 C 2 / ferric nitrate mixture;

[0047] (2) Under a nitrogen atmosphere, take 1g of the Ti prepared in step (1) 3 C 2 / ferric nitrate mixture and 4g sodium phosphite were put into a tube furnace, and the temperature was raised to 500°C at a heating rate of 2°C / min and kept for 3h to obtain Ti 3 C 2 / Iron phosphide composite material;

[0048] (3) get the Ti that 80g step (2) makes 3 C 2 / iron phosphide composite material, 10g SP, 10g PAA and water are made into a slurry, coated on copper foil, to obtain MXene / metal phosphide-based composite battery negative electrode material (Ti 3 C 2 / Fe 3 P).

[0049...

Embodiment 2

[0051] (1) Weigh 1g cobalt sulfate powder and 0.3g Ta 4 C 3 Put the powder into a polytetrafluoroethylene reactor, add 30ml of deionized water to dissolve, mix and stir for 20 hours; then put it in an oven at 120°C for hydrothermal reaction, the reaction time is 16 hours; after the reaction, perform suction filtration and dry to obtain Ta 4 C 3 / cobalt sulfate mixture.

[0052] (2) Under nitrogen atmosphere, take 1g of step (1) to prepare Ta 4 C 3 / Cobalt sulfate mixture and 3g of sodium hypophosphite are put into a tube furnace, and the temperature is raised to 700°C at a heating rate of 10°C / min and kept for 2h to obtain Ta 4 C 3 / cobalt phosphide composite material;

[0053] (3) get the Ta that 85g step (2) makes 4 C 3 / cobalt phosphide composite material, 5g vinylene, 10g CMC are made into slurry, are coated on the copper foil, obtain MXene / metal phosphide based composite battery negative electrode material (Ta 4 C 3 / CoP).

[0054] The MXene / metal phosphide-...

Embodiment 3

[0057] (1) Weigh 1g tin chloride powder and 1g V 2 Add C powder into a polytetrafluoroethylene reactor, add 50ml of deionized water to dissolve, mix and stir for 48 hours; then put it in an oven at 90°C for hydrothermal reaction, the reaction time is 20 hours; after the reaction, perform suction filtration and dry to obtain V 2 C / tin chloride mixture;

[0058] (2) Under nitrogen atmosphere, take 1g of V prepared in step (1) 2 C / tin chloride mixture and 1g of sodium hypophosphite were placed in a tube furnace, and the temperature was raised to 400°C at a rate of 20°C / min and kept for 4 hours to obtain V 2 C / tin phosphide mixture;

[0059] (3) Get 70g of V prepared in step (2) 2 C / tin phosphide composite material, 15g conductive carbon black, 15g CMC are made into slurry, are coated on carbon paper, obtain MXene / metal phosphide based composite battery negative electrode material (V 2 C / Sn 3 P 2 ).

[0060] The MXene / metal phosphide-based composite battery negative elect...

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Abstract

The invention belongs to the technical field of high-performance / high-energy-density lithium ion battery anodes, and particularly relates to an MXene / metal phosphide composite material, and an anode material and preparation and application thereof. The preparation method comprises the following steps: mixing and stirring a metal salt of a transition metal element, an MXene material and water, carrying out hydrothermal reaction, and drying to obtain an MXene / metal salt mixture; and in a protective atmosphere, carrying out heat treatment on the MXene / metal salt mixture and a phosphorus source toobtain the MXene / metal phosphide composite material. The invention also provides an MXene / metal phosphide-based composite battery anode material. The anode material comprises the MXene / metal phosphide composite material, a conductive agent and a binder, and the battery anode material has good long-cycle stability, high energy density and excellent rate capability, and can be applied to various fields.

Description

technical field [0001] The invention belongs to the technical field of high-performance / high-energy-density lithium-ion battery anodes, and specifically relates to an MXene / metal phosphide composite material, anode material, and its preparation and application. Background technique [0002] In the past few decades, lithium-ion batteries have attracted great attention due to their high energy density, light weight, and good cycle performance. However, with the development of society, the existing lithium-ion batteries have been difficult to meet the requirements of some electronic equipment, large power grids and electric vehicles. Facing the ever-increasing demand for higher-performance batteries, it is urgent to develop a new type of electrode material to obtain a new type of lithium-ion battery with higher energy density, longer cycle life, and fast charge-discharge capability. [0003] Transition metal phosphides have high theoretical capacity and low cost, and are ideal...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5805H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 闵永刚饶秋实廖松义刘屹东黄兴文李越珠
Owner GUANGDONG UNIV OF TECH
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