Transition metal phosphide with phosphorus vacancies filled with non-metallic elements, preparation of transition metal phosphide and lithium-sulfur battery

A technology of non-metallic elements and transition metals, which is applied in the field of preparation of inorganic compounds, can solve problems such as the reduction of sulfur utilization rate and coulombic efficiency, the poor conductivity of sulfur and discharge products, and the hindrance of electron and ion conduction, so as to improve the kinetics of chemical reactions And cycle stability, improve electron transport performance, improve the effect of catalytic activity

Active Publication Date: 2022-07-08
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium-sulfur batteries are currently facing a series of challenges: the poor conductivity of the active material sulfur and discharge products hinders the conduction of electrons and ions; the lithiation of sulfur leads to significant volume expansion, resulting in microcracks in the electrode skeleton, causing capacity decay; The shuttle effect caused by the back-and-forth diffusion of intermediate polysulfides between the positive and negative electrodes can easily lead to a decrease in sulfur utilization and Coulombic efficiency
As one of the most critical parts of lithium-sulfur batteries, the positive electrode is expected to solve the problems of capacity fading and poor stability by modifying the positive electrode material.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Transition metal phosphide with phosphorus vacancies filled with non-metallic elements, preparation of transition metal phosphide and lithium-sulfur battery
  • Transition metal phosphide with phosphorus vacancies filled with non-metallic elements, preparation of transition metal phosphide and lithium-sulfur battery
  • Transition metal phosphide with phosphorus vacancies filled with non-metallic elements, preparation of transition metal phosphide and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of a cobalt phosphide electrode (abbreviated as: S-CoP-CC) filled with phosphorus vacancies with sulfur element, the method steps are as follows:

[0042] (1) Electrodeposition cobalt hydroxide nanosheet arrays on carbon cloth by electrodeposition method: add 0.01 mol of cobalt nitrate to 200 mL of deionized water and mix evenly to obtain a cobalt nitrate aqueous solution; use titanium mesh as the counter electrode and carbon cloth as the work Electrode, saturated calomel electrode is the reference electrode, each electrode is inserted into the cobalt nitrate aqueous solution, the electrodeposition potential is -0.1V, the electrodeposition time is 10min, and the cobalt hydroxide nanosheet array is obtained on the carbon cloth; deionized water The cobalt hydroxide nanosheet array was washed three times, then placed in a vacuum drying oven and dried at 70 °C for 12 h to obtain a carbon cloth grown with cobalt hydroxide nanosheet array, wherein the mass...

Embodiment 2

[0048] A preparation method of a cobalt phosphide electrode (N-CoP-CC) filled with nitrogen element containing phosphorus vacancies, the method steps are as follows:

[0049] The difference from Example 1 is that in step (4), 294 mg of V O -CoP-CC was placed in a tube furnace, under argon atmosphere, V was heated at a heating rate of 5 °C / min O -CoP-CC was heated to 300 ℃, and then passed ammonia gas for 1 hour, during which argon gas and ammonia gas were kept in the state of constant flow; among them, the flow rate of argon gas was 200sccm, and the flow rate of ammonia gas was 10sccm; At room temperature, a carbon cloth with cobalt phosphide nanosheet arrays grown with nitrogen filled with phosphorus vacancies, that is, a cobalt phosphide electrode with nitrogen filled with phosphorus vacancies (abbreviated as N-CoP-CC) is obtained. Other preparation methods are the same as in Example 1.

[0050] The N-CoP-CC was observed with an FEI Quanta 250 field emission scanning elect...

Embodiment 3

[0052] A preparation method of a cobalt phosphide electrode (F-CoP-CC) filled with phosphorus vacancies with fluorine element, the method steps are as follows:

[0053] The difference from Example 1 is that in step (4), a plasma treatment method was used to treat 294 mg of V O -Phosphorus vacancies in CoP-CC are filled with fluorine, and the specific conditions of plasma treatment are: pass CF into 4 , CF 4 The flow rate is 100sccm, the flow rate of argon gas is 80sccm, the effective power of the radio frequency power supply is 100W, and the processing time is 60min to obtain a carbon cloth with cobalt phosphide nanosheet arrays filled with fluorine element and phosphorus vacancies, that is, the carbon cloth with fluorine element filled with phosphorus vacancies. Cobalt phosphide electrode (abbreviated as: F-CoP-CC). Other preparation methods are the same as in Example 1.

[0054] The F-CoP-CC was observed with a FEI Quanta 250 field emission scanning electron microscope fr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
poweraaaaaaaaaa
thicknessaaaaaaaaaa
quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention relates to transition metal phosphide with phosphorus vacancies filled with non-metallic elements, preparation of the transition metal phosphide and a lithium-sulfur battery, and belongs to the technical field of inorganic compound preparation. In the transition metal phosphide, non-metallic elements are filled in phosphorus vacancies of the transition metal phosphide; the non-metallic element is sulfur, nitrogen, fluorine, chlorine or boron. Calcining sulfur powder and the transition metal phosphide containing the phosphorus vacancies in an argon atmosphere to prepare the transition metal phosphide with the phosphorus vacancies filled with sulfur elements; calcining the transition metal phosphide containing the phosphorus vacancies in the atmosphere of argon and ammonia gas to prepare the transition metal phosphide with the phosphorus vacancies filled with nitrogen elements; the transition metal phosphide with phosphorus vacancies filled with fluorine, chlorine or boron is obtained by adopting a plasma treatment method. When the transition metal phosphide with the phosphorus vacancy filled with the non-metallic element is applied as a positive electrode material of a lithium-sulfur battery, the chemical reaction kinetics and the cycling stability of the lithium-sulfur battery can be effectively improved.

Description

technical field [0001] The invention relates to a transition metal phosphide filled with phosphorus vacancies by non-metal elements, its preparation and a lithium-sulfur battery, and belongs to the technical field of inorganic compound preparation. Background technique [0002] Lithium-sulfur battery is an energy storage device based on the redox reaction between lithium and sulfur to complete the mutual conversion of electrical energy and chemical energy. Its theoretical specific capacity (1675mAh g -1 ) and theoretical energy density (2600Wh kg -1 ) are far larger than the secondary batteries occupying the mainstream market at this stage, and are one of the secondary lithium battery systems with the most research and application prospects. In addition, the low price of elemental sulfur, abundant reserves and friendly environment make lithium-sulfur batteries have high commercial value. [0003] However, lithium-sulfur batteries currently face a series of challenges: the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08H01M4/58H01M10/052
CPCC01B25/08H01M4/5805H01M10/052C01P2004/03C01P2006/40H01M2004/028Y02E60/10Y02E60/36
Inventor 白羽屈美秀孙克宁彭琳高杨辰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap