MXene/metal sulfide composite material, anode material and preparation and application

A metal sulfide, 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, capacity reduction, etc., to improve energy density, good stability , the effect of preventing collapse

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.
At the same time, the transition metal sulfide material reacts with lithium to produce polysulfide intermediate products that are soluble in the electrolyte, forming a shuttle effect, resulting in a further decrease in capacity.

Method used

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  • MXene/metal sulfide composite material, anode material and preparation and application
  • MXene/metal sulfide composite material, anode material and preparation and application
  • MXene/metal sulfide composite material, anode material and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Weigh 1g manganese nitrate powder and 1g Ti respectively 3 C 2 Add the powder into a beaker, then add 200ml of deionized water to dissolve, mix and stir for 5 hours, then filter and dry to obtain Ti 3 C 2 / manganese nitrate mixture;

[0046] (2) Under a nitrogen atmosphere, take 1g of the Ti prepared in step (1) 3 C 2 / manganese nitrate mixture and 1g thioacetamide were placed in a tube furnace, and the temperature was raised to 550°C at a heating rate of 2°C / min and kept for 2.5h to obtain Ti 3 C 2 / manganese sulfide composite material;

[0047] (3) get the Ti that 80g step (2) makes 3 C 2 / manganese sulfide composite material, 10g SP, 10g CMC and water are made into a slurry, coated on carbon cloth to obtain sulfur-doped MXene / metal sulfide-based composite battery negative electrode material (Ti 3 C 2 / MnS).

[0048] figure 1 Is the MXene material Ti in this embodiment 3 C 2 It can be seen from the X-ray diffraction pattern that MXene has an obvious...

Embodiment 2

[0050] (1) Weigh 1g cobalt sulfate powder and 0.2g Ti respectively 2 Add C powder into a beaker, then add 300ml of deionized water to dissolve, mix and stir for 12 hours, then suction filter and dry to obtain Ti 2 C / cobalt sulfate mixture;

[0051] (2) Under a nitrogen atmosphere, take 1g of the Ti prepared in step (1) 2 C / cobalt sulfate mixture and 3g ammonium persulfate are put into a tube furnace, and the temperature is raised to 400°C at a heating rate of 10°C / min and kept for 4h to obtain Ti 2 C / cobalt sulfide composite material;

[0052] (3) get the Ti that 75g step (2) makes 2 C / cobalt sulfide composite material, 15g conductive carbon black, 10g PAA and water are made into slurry, and coated on copper foil to obtain sulfur-doped MXene / metal sulfide-based composite battery negative electrode material (Ti 2 C / CoS).

[0053] The sulfur-doped MXene / metal sulfide-based composite battery anode material prepared in step (3) was assembled into a lithium-ion half-cell wi...

Embodiment 3

[0056] (1) Weigh 1g antimony chloride powder and 0.5gV 4 C 3 Add the powder into a beaker, then add 300ml of deionized water to dissolve, mix and stir for 24 hours, filter and dry to obtain V 4 C 3 / antimony chloride mixture;

[0057] (2) Under nitrogen atmosphere, take 1g of V prepared in step (1) 4 C 3 / antimony chloride mixture and 1g cysteine ​​were placed in a tube furnace, and the temperature was raised to 900°C at a heating rate of 20°C / min and kept for 6 hours to obtain V 4 C 3 / antimony sulfide mixture;

[0058] (3) Get 70g of V prepared in step (2) 4 C 3 / antimony sulfide mixture, 20g SP, 10g CMC and water are made into slurry, coated on the carbon-coated copper foil, obtain sulfur-doped MXene / metal sulfide-based composite battery negative electrode material (V 4 C 3 / Sb 2 S 3 ).

[0059] The sulfur-doped MXene / metal sulfide-based composite battery anode material prepared in step (3) was assembled into a lithium-ion half-cell with a lithium sheet, and ...

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Abstract

The invention belongs to the technical field of high-performance / high-energy-density lithium ion battery negative electrodes, and particularly relates to an MXene / metal sulfide composite material, ananode material and preparation and application. The preparation method comprises the following steps: mixing and stirring a metal salt of a transition metal element and an MXene material, and carryingout solid-liquid separation and drying to obtain an MXene / metal salt mixture; and under a protective atmosphere, mixing the MXene / metal salt mixture with a sulfur source, and carrying out heat treatment to obtain the MXene / metal sulfide composite material. The invention also provides a sulfur-doped MXene / metal sulfide-based composite battery anode material. The anode material comprises the MXene / metal sulfide composite material. The anode material provided by the invention 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 negative electrodes, and in particular relates to an MXene / metal sulfide composite material, negative electrode materials, and their 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 sulfides have high theoretical capacity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525H01M2004/027Y02E60/10
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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