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Bismuth phosphate composite reduction graphene oxide material as well as preparation method and application thereof

A technology of graphene and bismuth phosphate, which is applied in the field of composite materials, can solve the problems of unsuitability for large-scale production, cumbersome operation steps, and high energy consumption of the reaction, and achieve the effects of high repeatability, good cycle stability, and low reaction cost

Active Publication Date: 2019-07-30
YANSHAN UNIV
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Problems solved by technology

[0005] The traditional preparation methods of bismuth phosphate composite materials include microwave method, hydrothermal solvothermal method, co-precipitation method and other methods, but these methods have the defects of cumbersome operation steps, high reaction energy consumption and high cost, and are not suitable for large-scale production. scale production

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  • Bismuth phosphate composite reduction graphene oxide material as well as preparation method and application thereof
  • Bismuth phosphate composite reduction graphene oxide material as well as preparation method and application thereof
  • Bismuth phosphate composite reduction graphene oxide material as well as preparation method and application thereof

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preparation example Construction

[0027] The invention provides a preparation method of a bismuth phosphate composite reduced graphene oxide material, comprising the following steps:

[0028] (1) Phosphorus source, graphene oxide and water are mixed to obtain a pre-dispersion;

[0029] (2) Mixing the bismuth source, the reducing agent and the pre-dispersion liquid for reduction reaction to obtain bismuth phosphate composite reduced graphene oxide.

[0030] The invention mixes phosphorus source, graphene oxide and water to obtain pre-dispersed liquid. In the present invention, the phosphorus source is phosphoric acid, and the phosphoric acid is added in the form of a phosphoric acid solution; the molar concentration of the phosphoric acid solution is preferably 1 to 6 mol / L, more preferably 2 to 4 mol / L; the predispersion The volume concentration of graphene oxide in the medium is 0.6-3 mg / mL, more preferably 1-2 mg / mL. In the present invention, it is also preferred to first prepare the graphene oxide into a ...

Embodiment 1

[0042] At normal temperature and pressure, add 10mL of 1mol / L phosphoric acid aqueous solution and 20mg of graphene oxide into 20mL of water, put them in a beaker, heat in a water bath and keep the temperature at 80°C, and stir for 10 minutes to obtain a pre-dispersion; then add 0.3854 Put 1 g of bismuth nitrate pentahydrate and 100 mg of ascorbic acid into the pre-dispersion liquid, stir at constant temperature for 8 hours, and the stirring speed is 150 r / min. Then the reaction kettle was naturally cooled to room temperature, the mixed solution was washed with ethanol and distilled water for 5 times, filtered, and the obtained powder was placed in a vacuum drying oven at 100°C for 8 hours in vacuum to obtain a bismuth phosphate composite reduced graphene oxide material BiPO 4 @rGO.

[0043] The resulting BiPO was analyzed using a scanning electron microscope 4 The morphology characteristics of @rGO were observed, and the resulting BiPO 4 Scanning electron microscope images...

Embodiment 2

[0047] At normal temperature and pressure, add 10mL of 1mol / L phosphoric acid aqueous solution and 20mg of graphene oxide into 10mL of water, put them in a beaker, heat in a water bath and keep the temperature at 60°C, and stir for 30 minutes to obtain a pre-dispersion; then add 0.3854 Put 1 g of bismuth chloride and 100 mg of hydrazine hydrate into the pre-dispersion liquid, stir at constant temperature for 6 hours, and the stirring speed is 100 r / min. Then the reaction kettle was naturally cooled to room temperature, the mixed solution was washed with ethanol and distilled water for 6 times, filtered, and the obtained powder was placed in a vacuum drying oven at 100°C for 12 hours in vacuum to obtain a bismuth phosphate composite reduced graphene oxide material BiPO 4 @rGO.

[0048] to the resulting BiPO 4 @rGO conducts XRD diffraction spectrum test. After analysis, the measured substance is bismuth phosphate material, and graphene oxide does not appear at the correspondin...

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Abstract

The invention provides a bismuth phosphate composite reduction graphene oxide material as well as a preparation method and application thereof, and belongs to the technical field of composite materials. The preparation method provided by the invention is simple in required equipment, easy to operate, high in repeatability, and free of additional catalyst, surfactant, structure directing agent andthe like in the reaction process; the bismuth phosphate composite reduction graphene oxide material can be obtained only by one-step reaction, so that the reaction cost is low, and the method is suitable for industrial mass production; and the when the obtained bismuth phosphate composite reduction graphene oxide material is used for a negative electrode material of a sodium ion battery, the batter is high mass specific capacity and high in cycling stability. Furthermore, the reaction temperature of the preparation method provided by the invention is lower than 100 DEG C, and the reaction conditions are mild. The result shows that when the bismuth phosphate composite reduction graphene oxide material provided by the invention is applied to the negative electrode material of the sodium ionbattery, the mass specific capacity of the battery can reach 293.5mAh / g after the battery is subjected to 300 charging and discharging cycles.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a bismuth phosphate composite reduced graphene oxide material and its preparation method and application. Background technique [0002] Rechargeable lithium-ion batteries (LIBs) have been widely used as energy storage devices and are considered to be the most promising storage devices due to their high gravimetric and volumetric energy, high power density, long cycle life, and low self-discharge performance. One of the energy systems, widely used in portable electronic devices and electric vehicles and other fields. However, the limited resources of lithium-ion batteries available for development and utilization make the prospect of lithium-ion batteries bleak. [0003] Sodium-ion batteries (NIBs) have been developed to address this issue and have attracted extensive attention so far. Although the battery structures of NIBs and LIBs are the same, the diameter and ma...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 高发明奚尧凯周军双栾孙锐李俊凯韩民泽
Owner YANSHAN UNIV
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