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A kind of preparation method of bubble film graphene-coated metal phosphide electrode material

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

Active Publication Date: 2022-06-07
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of bubble film graphene-coated metal phosphide electrode material
  • A kind of preparation method of bubble film graphene-coated metal phosphide electrode material
  • A kind of preparation method of bubble film graphene-coated metal phosphide electrode material

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Effect test

Embodiment 1

[0027] Completely dissolve 1 mmol of ferric nitrate in 35 mL of deionized water to form a ferric nitrate solution; completely dissolve 15 g of polyvinylpyrrolidone in 60 mL of deionized water to form a polyvinylpyrrolidone solution; then slowly pour the polyvinylpyrrolidone solution into the ferric nitrate solution, Magnetic stirring at 25°C for 4 hours, fully mixed to obtain the precursor solution; transfer the precursor solution to a rotary evaporator, keep at 80°C for 16 hours, and after the water is completely evaporated, the complex powder is obtained; The powder was placed in a tube furnace, and after vacuuming, argon gas with a flow rate of 50 sccm was introduced, and the temperature was raised to 600 °C at a heating rate of 3 °C / min, maintained for 3 h, and cooled to room temperature naturally to obtain bubble film graphene wraps. Metal-coated particulate material; mix the bubble film graphene-coated metal particulate material and NaH in a mass ratio of 1:2 2 PO 2 ·H ...

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention discloses a method for preparing a bubble film-shaped graphene-coated metal phosphide electrode material. The coordination organic solution is added to the metal salt solution, stirred evenly, and the water is evaporated to obtain the complex powder, which is placed in a tube furnace. Vacuumize, feed in argon or nitrogen, keep warm at a certain temperature, and get the bubble film-like graphene-coated metal particle material; mix the metal particle material and phosphorus source, vacuumize in a tube furnace, pass in hydrogen and argon to mix Gas, heat preservation, cooling, prepared bubble film graphene coated metal phosphide electrode material. The preparation method can effectively improve the utilization rate of active materials. The high conductivity of graphene promotes the transmission of electrons / sodium ions, and maintains good stability after long-term cycling. The metal phosphide with a hollow structure can ease the release of sodium ions. The volume effect in the process, so as to achieve excellent sodium storage performance.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and relates to a preparation method of a bubble film graphene-coated metal phosphide electrode material. Background technique [0002] In recent years, driven by "green" technology, lithium-ion batteries have expanded from portable products to large-scale applications, especially in the field of electric vehicles. But the lithium resources on earth cannot meet the growing demand of mankind. Sodium and lithium belong to the same family 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 received attention. Na-ion batteries rely heavily on the structure and properties of battery materials. Electrode materials are the core components of batteries, and the price and performance of sodium-ion batteries mainly depend on the choice of anode materials. [0...

Claims

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Application Information

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Patent Type & Authority Patents(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