Composite electrode and preparation method and application

A composite electrode and electroplating solution technology, used in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of reduced electrode performance, complex process, complicated experimental steps, etc., to achieve enhanced mechanical stability, high quality ratio Capacitance, the effect of facilitating ion transport

Active Publication Date: 2018-06-15
ANHUI UNIVERSITY
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Problems solved by technology

The prepared carbon electrode forms microscopic spherical particles, and the particles are superimposed on each other. This self-aggregation phenomenon will make it difficult for the electrolyte to penetrate into the active material, thereby reducing the performance of the electrode. Moreover, the experimental steps of this hydrothermal method are complicated and the experimental conditions are harsh. And the preparation cycle is long
Another Chinese patent "manganese-containing transition metal composite oxide electrode and its preparation method and application" (publication number 103996547 A) uses electroplating to prepare a manganese-containing transition metal composite oxide electrode, and the mass specific capacitance of the electrode is 313F·g -1 , its process is complex and its specific capacitance is low
In addition, Jinbing Cheng et al [Materials Letters 165 (2016) 231-234] prepared CoMn by precipitation and annealing 2 o 4 Microspheres, and used for supercapacitor electrodes, the cost of the method is high and its mass specific capacitance is low, only 788F·g -1

Method used

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  • Composite electrode and preparation method and application
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  • Composite electrode and preparation method and application

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preparation example Construction

[0035] A preparation method of a composite electrode, specifically comprising the following steps:

[0036] 1) Preparation of the substrate: cleaning the substrate to remove the oxide layer and oil on the surface;

[0037] 2) Preparation of solution: prepare additive solution containing carbon-based materials, and its concentration range is 3-7 mg·mL -1 ;

[0038] Prepare an electroplating solution containing transition metal oxides, the concentration of transition metal ions in the electroplating solution ranges from 3 to 5M;

[0039] 3) electroplating carbon layer: on the substrate after cleaning, adopt the additive solution in step 2) to electroplate the carbon layer;

[0040] 4) electroplating transition metal oxide layer: on the substrate after electroplating the carbon layer, continue to use the electroplating solution in step 2) to electroplate the transition metal oxide layer;

[0041] 5) Cleaning and drying: after electroplating, rinse repeatedly with deionized wat...

Embodiment 1

[0050] A preparation method of a composite electrode, specifically comprising the following steps:

[0051] 1) Preparation of the substrate: first take the foamed nickel, cut it into a sample of 1cm×2cm, soak it in hydrochloric acid (6M), acetone, ethanol in sequence and ultrasonically clean it for 10min to remove the surface oxide layer and oil, and then put it into a nitrogen glove box medium dry for later use;

[0052] 2) Preparation of the solution: prepare an additive solution containing carbon-based materials, containing 3 mg·ml -1 GO, 2mg·ml -1 AC and 0.1M lithium perchlorate trihydrate (LiClO 4 ·3H 2 O) mixing the aqueous solution so that the total concentration of the carbon-based material in the solution is 4 mg·ml -1 , ultrasonic mixing and magnetic stirring for 1 h each;

[0053] Prepare a plating solution containing transition metal ions, including 1M Co(NO 3 ) 2 ·6H 2 O, 2M MnCl 2 4H 2 A mixed aqueous solution of O and 1M sodium chloride (NaCl), so that...

Embodiment 2

[0062] A preparation method of a composite electrode, specifically comprising the following steps:

[0063] 1) Preparation of the substrate: first take foamed nickel, cut it into a sample of 1cm×2cm, soak it in hydrochloric acid (6M), acetone, ethanol and ultrasonically clean it for 10min to remove the surface oxide layer and oil, and then put it in a nitrogen glove box Dry and reserve;

[0064] 2) Preparation of the solution: prepare an additive solution containing carbon-based materials, containing 3 mg·ml -1 GO, 2mg·ml -1 AC and 0.1M LiClO 4 ·3H 2 O Mix the aqueous solution so that the total concentration of carbon-based materials in the solution is 5 mg·ml -1 , ultrasonic mixing and magnetic stirring for 1 h each;

[0065] Prepare a transition metal oxide-containing plating solution containing 1M Co(NO 3 ) 2 ·6H 2 O, 2M MnCl 2 4H 2 O, 2MNiCl 2 ·6H 2 A mixed aqueous solution of O and 1M NaCl, so that the total concentration of transition metal ions in the electr...

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Abstract

The invention belonging to the fields of electronic materials and devices discloses a composite electrode comprising a substrate. A carbon layer is electroplated on the surface of the substrate; and atransition metal oxide layer is electroplated on the surface of the carbon layer. The composite electrode has a three-dimensional porous fold structure; and the maximum mass specific capacitance of the composite electrode can reach up to 1783F.g-1. The preparation method of the composite electrode comprises: step one, preparing a substrate; step two, preparing a solution; step three, electroplating a carbon layer; step four, electroplating a transition metal oxide layer; and step five, carrying out cleaning and drying. Meanwhile, an application of the composite electrode in a super capacitoris also provided. The composite electrode has the high conductivity and high mass specific capacitance and cycle stability; and the maximum mass specific capacitance of the composite electrode can reach up to 1783F.g-1; the electrode can work circularly for 2000 times under the current density of 6A.g-1; and the specific capacitance can be kept to be 84.4% of the initial value. The composite electrode has the broad application prospects.

Description

technical field [0001] The invention relates to a composite electrode and its preparation method and application, belonging to the field of electronic materials and devices. Background technique [0002] Supercapacitor (SC) is a new type of energy storage device between traditional capacitors and chemical power sources. It has the advantages of short charging time, long cycle life, wide applicable temperature range, economical and environmental protection, and has attracted widespread attention in many fields. . With the aggravation of global warming, environmental pollution and energy shortage, there is an urgent need to replace traditional energy with clean energy and develop a supporting energy storage system. Compared with traditional secondary batteries and traditional dielectric capacitors, SC can meet the needs of the development of modern electronics industry due to its high energy density, fast charge and discharge and other advantages. According to different char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/46H01G11/36H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/36H01G11/46H01G11/86Y02E60/13
Inventor 曾玮马悦卫宁姜浩梁栋徐超黄林生
Owner ANHUI UNIVERSITY
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