Preparation method of MoS2/Ti3C2 MXene composite material for high-performance potassium ion battery

A composite material and potassium ion technology, which is applied in the field of preparation of MoS2/Ti3C2MXene composite materials, can solve the problems of poor cycle stability and reversible capacity fading, and achieve the effect of enhancing capacitance performance, reducing volume expansion and aggregation, and improving storage capacity

Active Publication Date: 2021-11-19
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MoS of the present invention 2 / Ti 3 C 2 MXene composites overcome the shortcomings of traditional single materials and solve the problems due to K + The problem of rapid reversible capacity fading and poor cycle stability caused by the huge volume expansion and pulverization of electrodes during repeated intercalation / extraction processes can significantly improve the cycle stability and specific capacity of potassium-ion batteries

Method used

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  • Preparation method of MoS2/Ti3C2 MXene composite material for high-performance potassium ion battery
  • Preparation method of MoS2/Ti3C2 MXene composite material for high-performance potassium ion battery
  • Preparation method of MoS2/Ti3C2 MXene composite material for high-performance potassium ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] MOS for high performance potassium ion batteries 2 / Ti 3 C 2 MXENE composites preparation method, including steps as follows:

[0050] (1) Preparation ET-Ti 3 C 2 MXENE nanoform

[0051] 1G particle size is less than 38 μm Ti 3 ALC 2 The powder was slowly added to the HF solution of 20 ml of mass fraction of 40 wt%, and used for 0.5 h to avoid overheating exothermic reactions, stirred at 35 ° C for 24 h; with deionized water repeatedly washed the result, centrifugal and decanted until the supernatant The pH of the liquid is 6 to 7, and the resulting precipitate is frozen at -30 ° C for 24 h to give Et-Ti 3 C 2 Mxnen nanoflakes.

[0052] (2) Preparationination in-Ti 3 C 2 MXENE nanoform

[0053] 1G ET-TI 3 C 2 The MXENE nanosin was dispersed in 20 ml of 1.8 mol / l NaOH solution, and the resulting mixture was continuously stirred at room temperature for 6 h; after the reaction was completed, centrifuged, the resulting precipitate was washed 6 times with deionized water, and...

Embodiment 2

[0061] MOS for high performance potassium ion batteries 2 / Ti 3 C 2 MXENE composites preparation method, including steps as follows:

[0062] (1) Preparation ET-Ti 3 C 2 MXENE nanoform

[0063] 1G particle size is less than 38 μm Ti 3 ALC 2 The powder was slowly added to the HF solution of 20 ml of mass fraction of 40 wt%, and used for 0.5 h to avoid overheating exothermic reactions, stirred at 35 ° C for 24 h; with deionized water repeatedly washed the result, centrifugal and decanted until the supernatant The pH of the liquid is 6 to 7, and the resulting precipitate is frozen at -30 ° C for 24 h to give Et-Ti 3 C 2 Mxnen nanoflakes.

[0064] (2) Preparationination in-Ti 3 C 2 MXENE nanoform

[0065] 1G ET-TI 3 C 2 The MXENE nanosin was dispersed in 30 ml of 1.8 mol / lnaH solution, and the resulting mixture was continuously stirred at room temperature for 6 h; after the reaction was completed, the resulting precipitate was washed 6 times with deionized water, and the obtained p...

Embodiment 3

[0069] MOS for high performance potassium ion batteries 2 / Ti 3 C 2 MXENE composites preparation method, including steps as follows:

[0070] (1) Preparation ET-Ti 3 C 2 MXENE nanoform

[0071] 1G particle size is less than 38 μm Ti 3 ALC 2 The powder was slowly added to the HF solution of 20 ml of mass fraction of 40 wt%, and used for 0.5 h to avoid overheating exothermic reactions, stirred at 35 ° C for 24 h; with deionized water repeatedly washed the result, centrifugal and decanted until the supernatant The pH of the liquid is 6 to 7, and the resulting precipitate is frozen at -30 ° C for 24 h to give Et-Ti 3 C 2 Mxnen nanoflakes.

[0072] (2) Preparationination in-Ti 3 C 2 MXENE nanoform

[0073] 1G ET-TI 3 C 2 The MXENE nanosin was dispersed in 20 ml of 1.8 mol / l NaOH solution, and the resulting mixture was continuously stirred at room temperature for 6 h; after the reaction was completed, centrifuged, the resulting precipitate was washed 6 times with deionized water, and...

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Abstract

The invention provides a preparation method of a MoS2 / Ti3C2 MXene composite material for a high-performance potassium ion battery. The preparation method comprises the following steps of: dispersing a plurality of layers of et-Ti3C2 MXene nanosheets in an intercalator solution, reacting at room temperature, centrifuging, washing and drying to obtain in-Ti3C2 MXene nanosheets; under ultrasonic and stirring conditions, adding a mixed solution of a molybdenum precursor and a sulfur precursor into an in-Ti3C2 MXene nanosheet dispersion liquid, and subjecting the obtained mixed solution to a high-temperature reaction; and after the reaction is completed, centrifuging, washing and drying the solution to obtain the product. The composite material disclosed by the invention overcomes the defects of a single material, and solves the problems of rapid reversible capacity attenuation and poor cycling stability caused by huge volume expansion and crushing of an electrode in a K<+> repeated intercalation / deintercalation process, so that the cycling stability and the specific capacity of the potassium ion battery are remarkably improved.

Description

Technical field [0001] The present invention relates to MOS for high performance potassium ion batteries. 2 / Ti 3 C 2 MXENE composites are prepared, which belongs to the technical field of potassium ion batteries. Background technique [0002] Currently, although the lithium-ion battery (LIBS) has successfully achieved commercialization, due to the high cost and resource distribution of lithium, it is still unable to meet future energy demand. In recent years, due to the rich reserves of potassium, low cost and its electrochemical properties similar to lithium, the potassium ion battery (PIBS) is considered to be a promising substitute for libs. In addition, K / K + (-2.93VVS standard hydrogen electrode (SHE) standard oxidative reduction potential and Na / Na + (-2.71VVS SHE) is relatively low, and closer to LI / LI + (-3.04V vs she) Standard oxidation reduction potential. In addition, in the electrolyte of the propylene carbonate (PC) solvent, with Compared to K + Stoke radiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/628H01M4/624H01M4/5815H01M10/054B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 尹龙卫赵瑞正王成祥赵丹阳惠晓斌丁明洁
Owner SHANDONG UNIV
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