Nano material as well as preparation method and application thereof

A nanomaterial and nanosheet technology, applied in the field of sodium ion batteries, can solve the problems of less active sites for sodium storage, large volume effect, and limited development, and achieve excellent electrochemical performance, simple production process, and easy industrial scale-up.

Pending Publication Date: 2022-04-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional dual-ion battery is also called "dual carbon battery". Carbon-based materials cannot meet the needs of sodium-based dual-ion batteries with high energy density and high power density, which greatly limits its practical development.
However, the continuous insertion and extraction of large sodium ions in the negative electrode material during the charge-discharge cycle is likely to cause the following problems: (1) Traditional carbon materials have fewer active sites for sodium storage, making it difficult to achieve high energy density requirements; (2) The negative electrode material is prone to volume expansion and pulverization during the process of intercalating sodium; (3) The SEI film formed on the surface of the negative electrode material is constantly undergoing a cycle of formation-rupture-regeneration, which consumes a large amount of active ions and electrolyte , resulting in a lower Coulombic efficiency
However, molybdenum disulfide electrode materials also face many challenges: (1) molybdenum disulfide is a semiconductor, which has poor conductivity; Slow kinetics; (3) A large volume effect is generated during the charge and discharge process, which easily causes the electrode to expand and fall off from the current collector, resulting in a rapid capacity decay, which limits its practical application

Method used

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  • Nano material as well as preparation method and application thereof
  • Nano material as well as preparation method and application thereof
  • Nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 1. Pretreatment of raw materials;

[0073] 1.44g of tellurium dioxide, 1.8g of polyvinylpyrrolidone (K30) and 150ml of ethylene glycol solution were placed in a 250mL round bottom flask, stirred at 130°C for 30min, and then heated to 200°C at a constant rate of 5°C / min. 0.9 g of sodium hydroxide was quickly added thereto, continued stirring at 200 °C for 2 h, and then centrifuged and dried to obtain tellurium nanotubes.

[0074] 2. Preparation of precursors;

[0075] Dissolve 50 mg of tellurium nanotubes prepared above, 100 mg of D-glucose, 150 mg of sodium molybdate and 300 mg of thiourea in 30 ml of deionized water solvent. After half an hour of ultrasonication, the resulting mixed solution is placed in a reaction kettle and transferred to React in an oil bath at 180°C for 10 hours. After the reaction, the product is centrifuged and dried to obtain a black solid powder precursor;

[0076] 3. Calcination process;

[0077] Heat the black solid powder precursor obtain...

Embodiment 2

[0092] Preparation of carbon-free film MoS 1.5 Te 0.5 The preparation process of the tube centerline structure nanocomposite is the same as that of Example 1, the only difference being that D-glucose is not added during the preparation of the precursor in Example 1.

[0093] The precursor prepared in this embodiment is carried out SEM test, the result is as follows Figure 10 As shown, because no surfactant was added, the surface of the Te nanotubes could not grow nanosheets uniformly, and a large number of small balls agglomerated by the nanosheets alone fell on the surface of the precursor.

Embodiment 3

[0095] Preparation of carbon-free film MoS x Te 2-x (where x=0, namely MoTe 2 ) tube midline structure nanocomposite material, the preparation process is the same as in Example 1, the only difference being that in the calcination process in Example 1, high-purity hydrogen is used as the reaction atmosphere.

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Abstract

The invention provides a nano material as well as a preparation method and application thereof. The nano material comprises nanosheets, the nanosheet has a chemical formula as shown in a formula I; moS < x > Te < 2-x > formula I, in which x is greater than or equal to 0 and less than 2; and the nanosheets are assembled into a tube center line hierarchical structure. The tellurium (Te) atom-doped MoSxTe2-x nanosheets are constructed, and meanwhile, the nanosheets are assembled into a'tube-center line 'nanostructure, so that the conductivity of the electrode can be improved, the volume expansion of the electrode in the circulation process can be effectively relieved, and the electrochemical performance of the electrode serving as a sodium-ion dual-ion battery negative electrode material is powerfully improved.

Description

technical field [0001] The application relates to a nanometer material and its preparation method and application, belonging to the field of sodium ion batteries. Background technique [0002] As an emerging energy storage device, sodium-based double-ion batteries hold great promise in a variety of energy storage applications due to their advantages such as high operating voltage, low cost, and environmental friendliness. However, the traditional dual-ion battery is also called "dual carbon battery". Carbon-based materials cannot meet the needs of sodium-based dual-ion batteries with high energy density and high power density, which greatly limits its practical development. However, the continuous insertion and extraction of large sodium ions in the negative electrode material during the charge-discharge cycle is likely to cause the following problems: (1) Traditional carbon materials have fewer active sites for sodium storage, making it difficult to achieve high energy dens...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/054B82Y40/00
CPCY02E60/10
Inventor 刘杨杰温珍海
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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