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Three-dimensional hollow WS2/C composite electrode material and preparation method and application thereof

A three-dimensional hollow, composite electrode technology, which is applied in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve the problems of unsatisfactory sodium storage performance and poor cycle stability, and achieve easy control of reaction temperature and raw materials. The effect of low cost and short time

Pending Publication Date: 2022-07-22
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a three-dimensional hollow WS 2 / C composite electrode materials and their preparation methods and applications to solve WS 2 Poor cycle stability due to volume expansion during charge and discharge, and WS 2 The problem of unsatisfactory sodium storage performance of a single hollow structure after multiple charges and discharges

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  • Three-dimensional hollow WS2/C composite electrode material and preparation method and application thereof
  • Three-dimensional hollow WS2/C composite electrode material and preparation method and application thereof

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preparation example Construction

[0039] The invention discloses a three-dimensional hollow WS 2 The preparation method of / C composite electrode material includes the following steps:

[0040] Step 1: Dissolve 0.1-1g of zinc acetate in 5-30mL of ultrapure water, stir for 5-15min until dissolved to obtain a clear and transparent solution. Then, 0.1-5 mL of ammonia water was added dropwise to the above transparent solution, and after continuing to stir for 10-30 min, 5-30 mL of ultrapure water was added and stirred for 20 min to obtain a uniform and transparent solution. The solution was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel autoclave, the reaction temperature was 160-220 °C, and the holding time was 12-36 h. After the reaction was completed, after cooling to room temperature, the white turbid liquid after the reaction was washed three times with ethanol and deionized water, respectively, and dried in a vacuum at 60° C. for 12 h to obtain a ZnO material.

[0041] Step 2: Take 0...

Embodiment 1

[0046] Step 1: Dissolve 0.1g of zinc acetate in 10mL of ultrapure water, stir for 5min until dissolved to obtain a clear and transparent solution. Then, 0.1 mL of ammonia water was added dropwise to the above transparent solution, and after continuing to stir for 10 min, 20 mL of ultrapure water was added and stirred for 20 min to obtain a uniform transparent solution. The solution was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel autoclave, the reaction temperature was 180 °C, and the holding time was 12 h. After the reaction was completed, after cooling to room temperature, the white turbid liquid after the reaction was washed three times with ethanol and deionized water, respectively, and dried in a vacuum at 60° C. for 12 h to obtain a ZnO material.

[0047] Step 2: Add 0.1g ZnO and 0.2g 2-methylimidazole to a mixed solvent of 10mL ultrapure water and 10mL NMP, ensure that the volume ratio of the mixed solvent is 1:1, stir for 10min to make it fully...

Embodiment 2

[0051] Step 1: Dissolve 0.2g of zinc acetate in 15mL of ultrapure water, stir for 15min until dissolved to obtain a clear and transparent solution. Then, 2 mL of ammonia water was added dropwise to the above transparent solution, and after continuing to stir for 30 min, 15 mL of ultrapure water was added and stirred for 20 min to obtain a uniform transparent solution. The solution was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel autoclave, the reaction temperature was 180 °C, and the holding time was 12 h. After the reaction was completed, after cooling to room temperature, the white turbid liquid after the reaction was washed three times with ethanol and deionized water, respectively, and dried in a vacuum at 60° C. for 12 h to obtain a ZnO material.

[0052] Step 2: Take 0.2g of ZnO and 0.4g of 2-methylimidazole and add it to a mixed solvent of 30 mL of ultrapure water and 30 mL of NMP to ensure that the volume ratio of the mixed solvent is 1:1. Aft...

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Abstract

The invention discloses a three-dimensional hollow WS2 / C composite electrode material and a preparation method and application thereof, a three-dimensional hollow carbon structure is constructed by using a hard template method and ZIF-8 derived carbon, and then the three-dimensional hollow WS2 / C composite material is synthesized by using a solvothermal method. The WS2 / C composite electrode material prepared by the method is high in phase purity and free of other impure phases; the WS2 / C composite electrode material is of a three-dimensional hollow composite structure, and the prepared WS2 / C composite electrode material is good in dispersity and uniform in size distribution; when the WS2 / C composite electrode material is applied to the sodium ion battery, the three-dimensional hollow structure can effectively improve the volume expansion of the electrode in the charge-discharge process on one hand, and the three-dimensional hollow carbon layer structure and the nano structure can ensure the high-speed migration of charges on the other hand, so that the excellent sodium storage performance is shown. The preparation method of the three-dimensional hollow WS2 / C composite electrode material disclosed by the invention is simple in experimental operation process, low in raw material cost, easy in reaction temperature control and short in used time, and can be used for large-scale preparation in a short time.

Description

technical field [0001] The invention belongs to WS 2 The technical field of nanomaterial preparation, in particular to a three-dimensional hollow WS 2 / C composite electrode material and preparation method and application thereof. Background technique [0002] WS 2 Nanosheets are typical layered transition metal sulfides, with strong covalent bonds (S-W-S) in the layers, and weak van der Waals forces between the layers, and the interlayer spacing is about 0.62 nm, which is beneficial to Diffusion of sodium ions with larger ionic radii. WS 2 The structure of the nanosheets is similar to that of graphite that stacks 2D monolayers through weak van der Waals interactions, and the 2D structure can provide a large surface area and 2D permeation channels to facilitate rapid electron transport within the monolayer, so that sodium ions can easily escape from the WS. 2 intercalation and deintercalation in nanosheets, so WS 2 It is also considered as a potential anode material fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054B82Y30/00B82Y40/00
CPCH01M4/362H01M4/5815H01M4/583H01M10/054B82Y30/00B82Y40/00
Inventor 曹丽云左梓锐兰妮王悦朱秦川王瑜航魏世英罗晓敏
Owner SHAANXI UNIV OF SCI & TECH
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