Preparation method of graphene/lamno3 composite material for supercapacitor

A technology of supercapacitors and composite materials, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problem of low specific capacity, achieve the effects of improved electrochemical performance, low preparation cost, and improved stability

Active Publication Date: 2019-05-31
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Perovskite structure manganese oxide LaMnO 3 The system has been widely used in solid fuel cells, solid electrolytes and catalysis due to its special structure and magnetoelectric properties. Similarly, in recent years, people have tried to prepare LaMnO as an electrode material for supercapacitors. 3 Active materials, however, some non-environmental harmful substances are often introduced during the synthesis process, and their specific capacities are relatively low

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  • Preparation method of graphene/lamno3 composite material for supercapacitor

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Experimental program
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Embodiment 1

[0023] Graphene / LaMnO is used for the supercapacitor of this embodiment 3 The preparation method of composite material comprises the following steps:

[0024] Step 1, ultrasonically dispersing graphene oxide in absolute ethanol to obtain solution A; the concentration of graphene oxide in solution A is 1 mg / mL;

[0025] Step 2, mixing lanthanum acetylacetonate and manganese acetylacetonate in a molar ratio of 1:1 and dissolving them in propionic acid to obtain solution B; the total concentration of metal cations in the solution B is 0.1mol / L;

[0026] Step 3. Mix the solution A described in step 1 and the solution B described in step 2 uniformly at a volume ratio of 1:1, and then add it to a rotary evaporator for rotary evaporation treatment to obtain the precursor C in the form of a gel ; The temperature of the rotary evaporation treatment is 70°C, and the time of the rotary evaporation treatment is 60min;

[0027] Step 4, subjecting the precursor C described in step 3 to hi...

Embodiment 2

[0030] Graphene / LaMnO is used for the supercapacitor of this embodiment 3 The preparation method of composite material comprises the following steps:

[0031] Step 1, ultrasonically dispersing graphene oxide in absolute ethanol to obtain solution A; the concentration of graphene oxide in solution A is 3 mg / mL;

[0032] Step 2, mixing lanthanum acetylacetonate and manganese acetylacetonate in a molar ratio of 1:1 and dissolving them in propionic acid to obtain solution B; the total concentration of metal cations in the solution B is 0.4mol / L;

[0033] Step 3. Mix the solution A described in step 1 and the solution B described in step 2 uniformly at a volume ratio of 1:3, and then add it to a rotary evaporator for rotary evaporation treatment to obtain a gel-like precursor C ; The temperature of the rotary evaporation treatment is 80°C, and the time of the rotary evaporation treatment is 50min;

[0034] Step 4, subjecting the precursor C described in step 3 to high-temperature...

Embodiment 3

[0037] Graphene / LaMnO is used for the supercapacitor of this embodiment 3 The preparation method of composite material comprises the following steps:

[0038] Step 1, ultrasonically dispersing graphene oxide in absolute ethanol to obtain solution A; the concentration of graphene oxide in solution A is 5 mg / mL;

[0039] Step 2, mixing lanthanum acetylacetonate and manganese acetylacetonate in a molar ratio of 1:1 and dissolving them in propionic acid to obtain solution B; the total concentration of metal cations in the solution B is 0.8mol / L;

[0040]Step 3. Mix the solution A described in step 1 and the solution B described in step 2 uniformly at a volume ratio of 1:3, and then add it to a rotary evaporator for rotary evaporation treatment to obtain a gel-like precursor C ; The temperature of the rotary evaporation treatment is 100°C, and the time of the rotary evaporation treatment is 30min;

[0041] Step 4, subjecting the precursor C described in step 3 to high-temperature...

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Abstract

The invention provides a preparation method of graphene / LaMnO3 composite material for a supercapcitor. The preparation method includes the following steps: 1. ultrasonically dispersing graphene oxide in absolute ethyl alcohol to obtain a solution A; 2. dissolving lanthanum acetylacetonate and manganese acetylacetonate in propionic acid to obtain a solution B; 3. uniformly mixing the solution A with the solution B, and then adding a mixed solution to a rotary evaporator for rotary evaporation treatment to obtain a precursor C in a gel state; and 4. Performing high-temperature thermal treatment on the precursor C under the protection of reducing gas to obtain the graphene / LaMnO3 composite material for the supercapacitor. The preparation technology is simple, the cost is low, and the prepared graphene / LaMnO3 composite material has relatively high specific capacitance and relatively good cycle stability, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for supercapacitors, in particular to a graphene / LaMnO for supercapacitors 3 Methods of preparation of composite materials. Background technique [0002] In order to solve the problems of energy crisis and environmental pollution faced by human society, people have been trying to develop environmentally friendly new energy sources. The supercapacitor, a new type of energy storage device developed in recent years, has attracted people's attention due to a series of advantages. It not only has high power density, long life, wide operating temperature, but also very fast charging. For supercapacitors, the quality of electrode materials is a key factor in determining their performance. People have been exploring ways to obtain high-performance electrode materials with the simplest possible methods. Since the discovery of graphene, its application in the field of supercapacitors has rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/46H01G11/86
CPCY02E60/13
Inventor 王耀金利华冯建情李成山张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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