MXene-based flexible composite negative electrode material and preparation method thereof

A technology of negative electrode material and base flexibility, which is applied in the field of MXene-based flexible composite negative electrode material and its preparation, can solve the problems of difficult high-strength flexibility and high-capacity, and achieves improved capacitance deionization performance, buffer volume expansion, and convenient operation. Effect

Inactive Publication Date: 2019-04-23
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide an MXene-based flexible composite negative electrode material and its prepar

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  • MXene-based flexible composite negative electrode material and preparation method thereof
  • MXene-based flexible composite negative electrode material and preparation method thereof

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preparation example Construction

[0028] The invention discloses a method for preparing an MXene-based flexible composite negative electrode material, which includes the following steps:

[0029] (1) Preparation of MXene / transition metal sulfides: Mix metal salts of transition metal elements and sulfur sources, then add MXene material and alkaline solution to obtain a mixed solution, and hydrothermally react in a high-pressure reactor to obtain MXene / transition metal Sulfide complex; the transition metal sulfide is MoS 2 , SnS 2 、CoS 2 、Ni 2 S 3 At least one of them, the weight percentage is 5%-20%; the MXene material is Ti obtained by HF selective etching 3 C 2 Tx, Ti 2 CTx, Ti 3 CNTx, Cr 2 At least one of CTx, wherein Tx is -OH functional group or / and -F functional group. The transition metal element is at least one of titanium, molybdenum, cobalt, nickel and tin, and the metal salt of the transition metal element refers to a kind of nitrate, carbonate, sulfate, chloride of transition metal or more...

Embodiment 1

[0037] A method for preparing an MXene-based flexible composite negative electrode material, comprising the following steps:

[0038] (1) Preparation of MXene / transition metal sulfides: Mix metal salts of transition metal elements and sulfur sources, then add MXene material and alkaline solution to obtain a mixed solution, and hydrothermally react in a high-pressure reactor to obtain MXene / transition metal Sulfide complex; the transition metal sulfide is MoS 2 , the weight percentage is 5%; the MXene material is Ti obtained by HF selective etching 3 C 2 Tx, wherein Tx is a -OH functional group. The transition metal element is titanium, and the metal salt of the transition metal element refers to a transition metal nitrate. The sulfur source is sodium sulfide. The molar ratio of the transition metal sulfide to the sulfur source is 0.2:1. The reaction temperature of the hydrothermal reaction is 100°C, the reaction time is 24h, the solid product is collected after cooling, w...

Embodiment 2

[0046] A method for preparing an MXene-based flexible composite negative electrode material, comprising the following steps:

[0047] (1) Preparation of MXene / transition metal sulfides: Mix metal salts of transition metal elements and sulfur sources, then add MXene material and alkaline solution to obtain a mixed solution, and hydrothermally react in a high-pressure reactor to obtain MXene / transition metal Sulfide complex; the transition metal sulfide is SnS 2 , the weight percentage is 20%; the MXene material is Ti obtained by HF selective etching 2 CTx, wherein Tx is -F functional group. The transition metal element is molybdenum, and the metal salt of the transition metal element refers to a transition metal carbonate. The sulfur source is thiourea. The molar ratio of the transition metal sulfide to the sulfur source is 1.0:1. The reaction temperature of the hydrothermal reaction is 200°C, and the reaction time is 48h. After cooling, the solid product is collected and w...

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Abstract

The invention discloses an MXene-based flexible composite negative electrode material and a preparation method thereof. According to the MXene-based flexible composite negative electrode material andthe preparation method thereof, a transition metal sulfide is loaded on a two-dimensional layered structure of the MXene material through a hydrothermal method. The agglomeration effect of the MXene material is overcome, and the collapse of a layered structure is prevented. Meanwhile, the energy density of the composite material is improved. The MXene material with high conductivity acts as a three-dimensional conductive network skeleton, so that the conductivity and the mechanical strength of the composite material are enhanced. The volume expansion of the transition metal polysulfide material in the charging process is buffered. Meanwhile, the material has good charge-discharge cycle stability. The composite material and expanded graphite are combined to prepare a self-supporting high-flexibility negative electrode material. In the charging and discharging process, the hydrophilic MXene material has high affinity to polysulfides. The electrochemical performance and the capacitive deionization performance of the composite negative electrode material can be further improved. Sulfides generated by transition metal sulfides are eliminated. The shuttle effect of the polysulfides is limited, and the service life of the negative electrode material is prolonged.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to an MXene-based flexible composite negative electrode material and a preparation method thereof. Background technique [0002] Flexible batteries are key components of wearable and foldable smart devices. The backwardness of current flexible energy storage technology has been unable to meet the needs of the development of portable flexible electronic devices. Therefore, the low-cost preparation of thin, flexible and high-performance flexible lithium-ion battery materials has quickly become a research hotspot and has broad market prospects. [0003] The traditional method of preparing negative electrode materials for lithium batteries is not suitable for the negative electrodes of flexible lithium-ion batteries. At present, the research on flexible negative electrode materials mainly focuses on high-conductivity materials such as carbon nanotubes, graph...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M4/58H01M4/36H01M10/0525C01B32/182
CPCC01B32/182H01M4/366H01M4/58H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 邱从交赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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