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Preparation method of bubble film-shaped graphene coated metal phosphide electrode material

A graphene-coated, metal phosphide technology, applied in the direction of phosphide, graphene, nanotechnology for materials and surface science, etc., can solve the problem of low rate performance, low specific capacity, excessive volume change, poor actual stability, etc. problems, to achieve excellent performance, alleviate volume effect, and easy operation

Active Publication Date: 2021-10-26
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity and excessive volume change during charging and discharging have become the bottleneck of its practical application.
Hollow structures can significantly alleviate the volume change during charging and discharging, but the stacking of hollow structures will lead to poor practical stability (30%~50%), low rate performance (10%~30%) and low specific capacity (~100 mAh / g )The problem

Method used

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  • Preparation method of bubble film-shaped graphene coated metal phosphide electrode material
  • Preparation method of bubble film-shaped graphene coated metal phosphide electrode material
  • Preparation method of bubble film-shaped graphene coated metal phosphide electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 1mmol ferric nitrate completely in 35mL deionized water to form a ferric nitrate solution; completely dissolve 15g polyvinylpyrrolidone in 60mL deionized water to form a polyvinylpyrrolidone solution; then slowly pour the polyvinylpyrrolidone solution into the ferric nitrate solution, Stir magnetically at 25°C for 4 hours and mix thoroughly to obtain a precursor solution; transfer the precursor solution to a rotary evaporator and keep it warm at 80°C for 16 hours. After the water is completely evaporated, the complex powder is obtained; The material powder is placed in a tube furnace. After vacuuming, argon gas with a flow rate of 50 sccm is introduced, and the temperature is raised to 600 °C at a heating rate of 3 °C / min. Coated metal particle material; mix the bubble film-like graphene-coated metal particle material and NaH at a mass ratio of 1:2 2 PO 2 ·H 2 O, placed in a tube furnace, after evacuating, feed a hydrogen-argon mixture composed of hydrogen an...

Embodiment 2

[0034] 1mmol cobalt chloride is completely dissolved in 10mL deionized water to form a cobalt chloride solution; 15g polydopamine is completely dissolved in 100mL deionized water to form a polydopamine solution; then the polydopamine solution is slowly poured into the cobalt chloride solution, Stir magnetically at 10°C for 5 hours and mix thoroughly to obtain a precursor solution; transfer the precursor solution to a rotary evaporator and keep it warm at 60°C for 24 hours. After the water is completely evaporated, the complex powder is obtained; The material powder is placed in a tube furnace. After vacuuming, nitrogen gas with a flow rate of 10sccm is introduced, and the temperature is raised to 300°C at a heating rate of 1°C / min, kept for 4h, and naturally cooled to room temperature to obtain a bubble film-like graphene coating. Metal particle material; by mass ratio 1: 0.1, mix the bubble film-like graphene-coated metal particle material and Na 2 HPO 4 12H 2 O, placed in ...

Embodiment 3

[0036] Completely dissolve 1mmol nickel acetate in 100mL deionized water to form a nickel acetate solution; completely dissolve 15g polyvinyl alcohol in 10mL deionized water to form a polyvinyl alcohol solution; then slowly pour the polyvinyl alcohol solution into the nickel acetate solution, Stir magnetically at 40°C for 1 hour and mix thoroughly to obtain a precursor solution; transfer the precursor solution to a rotary evaporator and keep it warm at 120°C for 10 hours. After the water is completely evaporated, the complex powder is obtained; The material powder is placed in a tube furnace, and after vacuuming, argon gas with a flow rate of 100 sccm is introduced, and the temperature is raised to 800°C at a heating rate of 10°C / min, kept for 1h, and naturally cooled to room temperature to obtain a bubble film-shaped graphene package. Metal-coated particle material; mix the bubble-film-like graphene-coated metal particle material and NaH at a mass ratio of 1:5 2 PO 4 2H 2 O...

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Abstract

The invention discloses a preparation method of a bubble film-shaped graphene coated metal phosphide electrode material, which comprises the following steps: adding a coordination organic matter solution into a metal salt solution, uniformly conducting stirring, evaporating water to obtain complex powder, putting the complex powder into a tubular furnace, conducting vacuumizing, introducing argon or nitrogen, and preserving heat at a certain temperature to obtain a bubble film-shaped graphene coated metal particle material; and uniformly mixing the metal particle material and a phosphorus source, conducting vacuumizing in a tubular furnace, introducing hydrogen-argon mixed gas, preserving heat, and conducting cooling to prepare the bubble film-shaped graphene coated metal phosphide electrode material. According to the preparation method, the utilization rate of an active material can be effectively increased, transmission of electrons / sodium ions is promoted through high conductivity of graphene, good stability is kept after long-time circulation, the metal phosphide of the hollow structure can relieve the volume effect in the sodium ion intercalation and deintercalation process, and therefore the excellent sodium storage performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and relates to a method for preparing a bubble-film graphene-coated metal phosphide electrode material. Background technique [0002] In recent years, under the impetus of "green" technology, lithium-ion batteries have expanded from portable products to large-scale applications, especially in the field of electric vehicles. However, lithium resources on the earth cannot meet the growing needs of human beings. Sodium and lithium belong to the same group in the periodic table, and have many similar chemical properties with lithium, and the storage of sodium resources is more abundant. Therefore, sodium-ion batteries have also attracted people's attention. Sodium-ion batteries rely heavily on the structure and performance of battery materials. Electrode materials are the core components of batteries, and the price and performance of sodium-ion batteries mainly depend on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08C01B32/184B82Y40/00B82Y30/00H01M4/36H01M4/58H01M4/62H01M10/054
CPCC01B25/08C01B32/184B82Y40/00B82Y30/00H01M4/366H01M4/5805H01M4/625H01M10/054C01P2004/80C01P2006/40C01P2004/34Y02E60/10
Inventor 贾赫男范月雯冯晨晨刘卯成
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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