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Preparation method of inorganic perovskite-coated MXene two-dimensional layered anode material

A two-dimensional layered, negative electrode material technology, used in battery electrodes, secondary batteries, electrical components, etc., can solve the problems of structural instability, mechanical orientation, affecting processing and stability, and achieve excellent physical and chemical properties, cost Inexpensive and simple process

Active Publication Date: 2019-05-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MXene materials face problems such as structural instability and mechanical orientation brought about by the intrinsic structure of the two-dimensional structure, which affects its subsequent processing and stability.

Method used

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  • Preparation method of inorganic perovskite-coated MXene two-dimensional layered anode material
  • Preparation method of inorganic perovskite-coated MXene two-dimensional layered anode material
  • Preparation method of inorganic perovskite-coated MXene two-dimensional layered anode material

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preparation example Construction

[0024] A preparation method of an inorganic perovskite-coated MXene two-dimensional layered negative electrode material, comprising the following steps:

[0025] S1. Add 2 mol of lead bromide and 1 mol of cesium bromide to 1L of N,N-dimethylformamide at the same time, heat to 68°C, and stir for 2.5 hours to obtain an inorganic perovskite material precursor. Nitrogen gas is introduced during the stirring process;

[0026] S2, the Ti 3 AlC 2 The powder was mixed with 35% HF aqueous solution at a molar ratio of 1:2, stirred and reacted, washed by centrifugation, and vacuum-dried at 78°C for 11 hours to obtain Ti 3 C 2 powder;

[0027] S3, weigh 1mol of Ti 3 C 2 Add the powder to the inorganic perovskite material precursor, continue heating to 68°C, stir for 2.5 hours, and pass nitrogen gas during the stirring process to obtain the precursor solution;

[0028] S4. Add toluene to the precursor solution, centrifuge three times, and vacuum-dry the solid obtained at 68° C. for 1...

Embodiment 2

[0030] A preparation method of an inorganic perovskite-coated MXene two-dimensional layered negative electrode material, comprising the following steps:

[0031] S1. Put 2 mol of lead bromide in a three-necked beaker, then add 1L of N,N-dimethylformamide, heat to 70°C, stir to fully dissolve, then add 1 mol of cesium bromide to continue the reaction, the whole reaction process Continue for 3 hours to obtain the precursor of inorganic perovskite materials. During the stirring and reaction process, the mixed gas of nitrogen and argon is continuously introduced to avoid the influence of humidity in the air;

[0032] S2, the Ti 3 AlC 2 The powder was mixed with 45% HF aqueous solution at a molar ratio of 1:2, stirred and reacted, washed by centrifugation, and vacuum-dried at 82°C for 13 hours to obtain Ti 3 C 2 powder;

[0033] S3, weigh 1mol of Ti 3 C 2 Add the powder into the inorganic perovskite material precursor, continue heating to 70°C, stir for 3 hours, and pass nitr...

Embodiment 3

[0036] A preparation method of an inorganic perovskite-coated MXene two-dimensional layered negative electrode material, comprising the following steps:

[0037] S1. Put 1mol of cesium bromide in a three-necked beaker, then add 1L of N,N-dimethylformamide, heat to 70°C, stir to make it fully dissolved, then add 2mol of lead bromide to continue the reaction, the whole reaction process Continue for 3 hours to obtain the precursor of inorganic perovskite materials. During the stirring and reaction process, the mixed gas of neon and argon is continuously introduced to avoid the influence of humidity in the air;

[0038] S2, the Ti 3 AlC 2 The powder was mixed with 40% HF aqueous solution at a molar ratio of 1:2, stirred and reacted, washed by centrifugation, and vacuum-dried at 80°C for 12 hours to obtain Ti 3 C 2 powder;

[0039] S3, weigh 1mol of Ti 3 C 2 Add the powder to the inorganic perovskite material precursor, continue heating to 70°C, stir for 2.5 hours, and pass n...

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Abstract

The invention discloses a preparation method of an inorganic perovskite-coated MXene two-dimensional layered anode material and relates to the technical field of preparation of lithium ion battery anode materials. The preparation method comprises the following steps: adding lead bromide and cesium bromide into N,N-dimethyl formamide, introducing protective gas, heating and stirring, so that an inorganic perovskite material precursor is obtained; adding Ti3AlC2 into HF aqueous solution, stirring and reacting, centrifuging, washing, and performing vacuum drying, so that Ti3C2 powder is obtained;adding the Ti3C2 powder into the inorganic perovskite material precursor, heating, and stirring, so that precursor solution is obtained; adding methylbenzene into the precursor solution, centrifuging, and performing vacuum drying, so that the inorganic perovskite-coated MXene two-dimensional layered anode material is obtained. The preparation method disclosed by the invention enhances structuralstability of a MXene two-dimensional layered anode material Ti3C2 by coating the MXene two-dimensional layered anode material Ti3C2 with the inorganic perovskite material, so that the anode material has good stability and excellent physical and chemical properties; meanwhile, compared with the conventional high-cost technology that a lithium battery anode material needs to be graphitized and coated with carbon at high temperature, the preparation method disclosed by the invention is simple in technology and low in cost.

Description

technical field [0001] The invention relates to the technical field of preparation of negative electrode materials for lithium ion batteries, in particular to a method for preparing an inorganic perovskite-coated MXene two-dimensional layered negative electrode material. Background technique [0002] With the ever-increasing demand for high-energy, long-life rechargeable lithium-ion batteries for electric vehicles, it is difficult for existing anode materials to meet this demand. At present, the anode materials for lithium-ion batteries mainly use graphite-based carbon anode materials, which have a wide range of raw materials, low prices, and excellent electrochemical cycle performance. They have become the main commercial materials in the lithium battery field, especially in the power battery industry. However, the theoretical specific capacity (372mAh / g) of graphite-based carbon negative electrode materials is low, the compatibility with solvents is poor, and lithium dendr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 欧阳浩淼朱钢立任宇曦王岷云王双双
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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