Symmetrical super capacitor

A supercapacitor, symmetrical technology, used in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of system power, rate and cycle performance deterioration, contact resistance increase, production cost increase, etc., to improve electronic and The effect of ion transport performance, reducing interface contact resistance, and improving utilization

Active Publication Date: 2020-02-28
JILIN JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of polymer binders leads to an increase in the contact resistance between the active material particles and between the active material particles and the current collector, which deteriorates the power, rate and cycle performance of the system.
In addition, most metal / oxide composite electrodes involve complex preparation processes, resulting in reduced production efficiency and increased production costs

Method used

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Examples

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preparation example Construction

[0039] Specifically, see figure 1 , the preparation method of the nickel nanotube array with multilayer structure according to one embodiment of the present invention, comprises the following steps:

[0040] Step 1. Electrochemical deposition of Ni on nickel foil (a) x Cu 100-x Alloy film (b), wherein x=30~80;

[0041] Step 2, to the Ni x Cu 100-x The alloy film is dealloyed to obtain a nickel film with an oxide film on the surface;

[0042] Step 3, soaking the nickel film in an acidic aqueous solution to remove the oxide film on the surface of the nickel film;

[0043] Step 4, heating the nickel film treated in step 3 at 30-80° C. for 5-10 hours to obtain a nickel nanotube array (c) with a single-layer structure;

[0044] Step 5, annealing the nickel nanotube array at 100-600° C. for 5-20 minutes to obtain the nickel nanotube array (d) having a multilayer structure (nickel oxide layer, nickel layer and nickel oxide layer).

[0045] Specifically, the electrochemical dep...

Embodiment 1

[0068] One, prepare the nickel nanotube array with multilayer structure according to the following method:

[0069] (1) Electrochemical deposition of nickel-copper alloy film on a clean nickel foil (2cm×2cm, 15μm thick), electrochemical deposition conditions: current density is -4.5mA cm -2 , the time is 10min, the solution contains 1M NiSO 4 , 0.05M CuSO 4 and 0.5M H 3 BO 3 (pH value is adjusted to be 4), the ratio of Ni:Cu:B is 20:1:10, uses two electrode system, and wherein nickel foil and platinum sheet are respectively working electrode and counter electrode;

[0070] (2) The alloy film obtained by electrochemical deposition was in the same solution at 0.5V (relative to Li + / Li) under dealloying, the time is 5min;

[0071] (3) Soak the nickel film after the dealloying that step (2) obtains in 1M hydrochloric acid solution for 15min, remove the surface oxide film, then clean it up with deionized water;

[0072] (4) heating the nickel film obtained in step (3) at 60°...

Embodiment 2

[0089] Nickel oxide-nickel-nickel oxide nanotube arrays were prepared as follows:

[0090] (1) Electrochemical deposition of nickel-copper alloy film on a clean nickel foil (2cm×2cm, 15μm thick), electrochemical deposition conditions: current density is -1mA cm -2 , the time is 30min, the solution contains 5M NiSO 4 , 0.25M CuSO 4 and 2.5M H 3 BO 3 (pH value is adjusted to be 2), the ratio of Ni:Cu:B is 20:1:10, uses two electrode systems, and wherein nickel foil and platinum sheet are respectively working electrode and counter electrode;

[0091] (2) Dealloying the alloy film obtained by electrochemical deposition in the same solution at 1V (relative to Li+ / Li) for 3min;

[0092] (3) soak the nickel film after the dealloying that step (2) obtains in 0.5M hydrochloric acid solution for 20min, remove surface oxide film, then clean up with deionized water;

[0093] (4) heating the nickel film obtained in step (3) at 30° C. for 10 h in a vacuum oven to obtain a nickel nanotu...

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Abstract

The invention relates to a symmetrical super capacitor. The capacitor includes symmetrical electrodes made of an array of nickel nanotubes having a multilayer structure. The symmetrical super capacitor has all the high specific capacity and excellent rate capability and cycling stability.

Description

technical field [0001] The invention relates to a symmetrical supercapacitor, in particular to a symmetrical supercapacitor comprising a nickel nanotube array with a multilayer structure. Background technique [0002] With the rapid development of portable smart wearable electronic devices, higher requirements are put forward for the supporting energy storage devices in terms of energy density, power density, rate performance and cycle stability. Supercapacitors are considered as a promising device due to their advantages of high power density and long lifetime. [0003] In electrode energy storage materials, carbon materials cannot meet the demand for high energy due to their low theoretical capacity; while transition metal oxides with high theoretical capacity have inherently poor electron and ion transport properties, and their actual capacity and Application is limited. [0004] Traditional planar electrodes usually adopt the method of coating, by using a non-conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/46H01G11/86C25D3/56C25D3/58C25D5/48C25D5/50
CPCC25D3/562C25D3/58C25D5/48C25D5/50H01G11/26H01G11/30H01G11/46H01G11/86Y02E60/13
Inventor 李英奇肖姗姗肖力光盖广清王立艳赵丽毕菲
Owner JILIN JIANZHU UNIVERSITY
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