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Vanadium disulfide and black phosphorus composite electrode material and preparation method thereof

A technology of vanadium disulfide and composite electrodes, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of reversible capacity and cycle performance attenuation, limit electrochemical performance, electrode conductivity reduction, etc., and achieve a stable thermodynamic form , Improve the electrochemical performance, the effect of high active sites

Active Publication Date: 2020-08-25
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium disulfide mostly has a random lamellar structure, which limits its electrochemical performance to a certain extent.
In addition, a single black phosphorus is prone to agglomeration during the intercalation / desodiumation process, causing the structure to collapse, resulting in a decrease in electrode conductivity, resulting in a rapid decline in reversible capacity and cycle performance.

Method used

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  • Vanadium disulfide and black phosphorus composite electrode material and preparation method thereof
  • Vanadium disulfide and black phosphorus composite electrode material and preparation method thereof

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Embodiment 1

[0018] A preparation method of vanadium sulfide and black phosphorus composite electrode material, comprising the following steps:

[0019] S1: Add 20mg of black phosphorus to 40ml of NMP, perform ultrasonication in an ice bath, then centrifuge (1500r / min) three times, take the supernatant respectively, and centrifuge for the fourth time (10000r / min) to get the precipitate;

[0020] S2: add 3mmol Na 3 VO 4 12H 2 O and 15 mmol thioacetamide (TAA) were dissolved in 40 ml deionized water and stirred for 1 h to form a homogeneous solution, then transferred to a 50 ml Teflon-lined autoclave and kept at 160 °C for 24 h before cooling to room temperature. The black precipitate was collected by centrifugation and washed several times with deionized water;

[0021] S3: 20 mg VS 2 ·NH 3 Use 30ml of water to disperse in the Erlenmeyer flask, and then use argon gas bubbling to discharge the dissolved oxygen from the solution, so as to avoid the oxidation of V(IV) to V(V). The above...

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Abstract

The invention belongs to the technical field of electrode material preparation, and particularly relates to a vanadium disulfide and black phosphorus composite electrode material and a preparation method thereof. The method comprises the steps: firstly, stripping black phosphorus; secondly, stripping the vanadium disulfide; and finally, compounding vanadium disulfide and black phosphorus to obtainthe vanadium disulfide and black phosphorus composite electrode material. The material has the characteristics of high specific surface area, high active sites and high specific capacity; and the pores between the nanosheet layers can buffer the volume change of the active material in the charging and discharging process, can increase the contact area with the electrolyte, reduces the ion transmission path, and is beneficial to the rapid transfer of electrons / ions, thereby improving the cycling stability and rate capability of the electrode material.

Description

Technical field: [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a composite electrode material of vanadium disulfide and black phosphorus and a preparation method thereof. Background technique: [0002] A large number of studies have shown that due to the influence of various factors, sodium ions can basically not be inserted into graphite sheets, which makes lower-cost graphite materials unsuitable for sodium-ion batteries, resulting in certain restrictions on the development of low-cost sodium-ion batteries. , therefore, it is necessary to develop anode materials more suitable for sodium-ion batteries. As a member of transition metal dichalcogenide materials, vanadium disulfide has a layered structure similar to graphite, because of its high theoretical specific capacity, large interlayer spacing, and high electrical conductivity, it is very suitable for use as Sodium ion battery anode material. At the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/362H01M4/38H01M4/5815H01M10/054B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 王晓君刘治明王旭辉孙洪冉徐常蒙李海昌魏晴
Owner QINGDAO UNIV OF SCI & TECH
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