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Method for increasing specific capacity of MnO2-based supercapacitor simply and quickly

A supercapacitor, specific capacity technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of reduced active material performance, slow radius migration, low specific capacity, etc., to improve performance and low cost. , the effect of increasing the specific capacity

Inactive Publication Date: 2017-02-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cations in the electrolyte have a large radius, so the migration speed is slow and the migration depth is shallow, which further causes the problem of low actual specific capacity; and the protons involved in energy storage are prone to produce mesophase MnOOH and disproportionation reactions, resulting in the active material. reduces the performance

Method used

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  • Method for increasing specific capacity of MnO2-based supercapacitor simply and quickly
  • Method for increasing specific capacity of MnO2-based supercapacitor simply and quickly
  • Method for increasing specific capacity of MnO2-based supercapacitor simply and quickly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] α-MnO 2 Base electrode:

[0044] (1) Preparation of α-MnO by hydrothermal method 2 Powder: weigh MnSO 4 Mass 1.352 g was dissolved in 60 mL of water, weighed KMnO 4 Dissolve the mass of 1.264 g in 60 mL of water, then mix the above two solutions at a volume ratio of 1:1, stir for 20 min to obtain a suspension, transfer it to a reaction kettle, seal it, react at 160°C for 24 h, pour water and cool to room temperature , filtered, washed, and dried at 80°C for 8 h to obtain α-MnO 2 powder;

[0045] The resulting α-MnO 2 The XRD pattern of the powder is as follows figure 1 shown by figure 1 It can be seen that the α-MnO prepared by hydrothermal method 2 α-MnO powder and standard PDF card2 consistent;

[0046] The resulting α-MnO 2 The SEM picture of the powder is as follows figure 2 shown by figure 2 It can be seen that the obtained α-MnO 2 The powder is in the shape of nano needles.

[0047] (2) Prepare slurry: weigh α-MnO 2 Powder (8 mg), acetylene black ...

Embodiment 2

[0054] α-MnO 2 Base electrode:

[0055] (1) Preparation of α-MnO by hydrothermal method 2 Powder: weigh MnSO 4 Quality 1.352g was dissolved in 40 mL water, weighed KMnO 4 The mass of 1.264g was dissolved in 40 mL of water, and then the above two solutions were mixed at a volume ratio of 1:1, and stirred for 40 minutes to obtain a suspension, which was transferred to a reaction kettle, sealed, and reacted at 180°C for 18 hours, then poured water and cooled to At room temperature, filter, wash, and dry at 80°C for 8 h to obtain α-MnO 2 powder;

[0056] The resulting α-MnO 2 The XRD figure and the SEM figure of powder are similar to embodiment 1;

[0057] (2) Prepare slurry: weigh α-MnO 2 Powder (6 mg), acetylene black (3 mg) and PTFE (1 mg), mixed with ethanol to dissolve, ultrasonically dispersed for 30 min to obtain a slurry;

[0058] (3) Determine the quality: cut a piece of copper foil as a carrier, and coat the slurry with 2 g / m 2 , using the difference method to c...

Embodiment 3

[0064] α-MnO 2 Base electrode:

[0065] (1) Preparation of α-MnO by hydrothermal method 2 Powder: weigh MnSO 4 Quality 1.352g was dissolved in 20 mL of water, weighed KMnO 4 The mass of 1.264g was dissolved in 20 mL of water, and then the above two solutions were mixed at a volume ratio of 1:1, and stirred for 50 min to obtain a suspension, which was transferred to a reaction kettle, sealed, and reacted at 120°C for 32 h, poured with water and cooled to At room temperature, filter, wash, and dry at 80°C for 8 h to obtain α-MnO 2 powder;

[0066] The resulting α-MnO 2 The XRD figure and the SEM figure of powder are similar to embodiment 1;

[0067] (2) Prepare slurry: weigh α-MnO 2 Powder (7 mg), acetylene black (2 mg) and PTFE (1 mg), mixed with ethanol to dissolve, ultrasonically dispersed for 60 min to obtain a slurry;

[0068] (3) Determine the quality: cut a piece of copper foil as a carrier, and coat the slurry at 5g / m 2 , using the difference method to calculate...

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Abstract

The invention discloses a method for increasing a specific capacity of a MnO2-based supercapacitor simply and quickly. The method includes: (1) dipping a MnO2 base electrode in a MnSO4 solution to enable Mn<2+> to be attached in MnO2 tunnels; (2) using the dipped MnO2 base electrode to prepare the MnO2-based supercapacitor. The prepared MnO2-based supercapacitor has the advantages that participation degree, in energy storage, of protons is increased, and the specific capacity of the MnO2-based supercapacitor is increased. The method is simple to operate, low in cost, remarkable in effect, and capable of improving MnO2 tunnel structures effectively, increasing the specific capacity of the MnO2-based supercapacitor and increasing utilizing efficiency of a MnO2-based electrode material. In addition, the method can be applied to production process of manganese-based faradaic pseudocapacitor electrodes, and also can be used as a theory to produce novel manganese ion contained electrolyte.

Description

technical field [0001] The invention belongs to the field of electrochemical supercapacitors, and in particular relates to a method for simply and rapidly improving the mass specific capacity of a manganese dioxide-based supercapacitor. Background technique [0002] Currently, MnO 2 Based supercapacitors have attracted the attention of researchers due to their low cost, environmental friendliness, and high safety. However, MnO 2 Base supercapacitors also face many problems, such as low actual specific capacity, unsatisfactory cycle life and stability, etc. Manganese oxide has a large tunnel structure, which is suitable for the intercalation and deintercalation of electrolyte cations and protons, thereby realizing energy storage through reversible Faradaic reactions. However, the cations in the electrolyte have a large radius, so the migration speed is slow and the migration depth is shallow, which further causes the problem that the actual specific capacity is not high; an...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/86H01G11/46
CPCY02E60/13H01G11/84H01G11/46H01G11/86
Inventor 程爽姚明海刘美林
Owner SOUTH CHINA UNIV OF TECH
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