Pseudocapacitive fibrous supercapacitor without blank volume in electrode and preparation method thereof
A supercapacitor and fibrous technology, applied in the field of pseudocapacitive fibrous supercapacitors and their preparation, can solve the problem that the gel electrolyte is difficult to penetrate, the energy density of the fibrous supercapacitor is reduced, and the active materials are not fully utilized, etc. problem, to achieve the effect of high energy density, high utilization rate, and high specific capacitance
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Embodiment 1
[0029] A pseudocapacitive fibrous supercapacitor with no void volume in the electrode, comprising a fibrous supercapacitor electrode 1 and a continuous, conductive porous capacitively active gel electrolyte 2, the gel electrolyte 2 infiltrated into the fibrous supercapacitor Inside the electrode 1; the fibrous supercapacitor electrode 1 includes a sheet-shaped shell electrode 3 and a fibrous inner core electrode 4. Covered with an electrolyte membrane, the outer surface of the sheet-shaped shell electrode 3 is wrapped with a protective layer 5;
[0030] The void volume in the electrode refers exactly to: the volume inside the electrode that cannot be used to participate in energy storage, including the volume occupied by the material with very poor capacitive activity inside the electrode, and the material inside the electrode has capacitive activity, but the electrolyte cannot The volume occupied by the contacted or infiltrated part, and the length and diameter of the fibrous...
Embodiment 2
[0034] The difference between this embodiment and embodiment 1 is:
[0035] A method for preparing a pseudocapacitive fibrous supercapacitor without void volume in an electrode, comprising the following steps:
[0036] Take a nickel foam fiber with a diameter of 2 mm and a length of 3 cm, ultrasonically clean it in acetone for 5 minutes to remove oil, then ultrasonically clean it in a 1mol / L hydrochloric acid solution to remove surface oxides, and then ultrasonically clean it with absolute ethanol and deionized water Wash several times. Then use the nickel foam fiber as the working electrode, in the mixed solution of 0.13M sodium acetate, 0.13M nickel sulfate and 0.1M sodium sulfate, at 1mA / cm 2 The current density is deposited for 1 hour, and a layer of nickel oxide-nickel hydroxide nanostructure is grown on the surface of the nickel foam skeleton. After taking it out, it is annealed in the air at 200°C for 1 hour to prepare foamed nickel / Ni(OH) 2 Fibrous electrodes (as in...
Embodiment 3
[0038] The difference between this embodiment and embodiment 1, 2 is:
[0039] A method for preparing a pseudocapacitive fibrous supercapacitor without void volume in an electrode, comprising the following steps:
[0040] Take a nickel foam fiber with a diameter of 2 mm and a length of 3 cm, ultrasonically clean it in acetone for 5 minutes to remove oil, then ultrasonically clean it in a 1mol / L hydrochloric acid solution to remove surface oxides, and then ultrasonically clean it with absolute ethanol and deionized water Wash several times for later use. Then add 0.1M CoCl to 50ml deionized water 2 , 0.2M NiCl 2 , 0.18M CO(NH 2 ) 2 and 0.04M hexadecyltrimethylammonium bromide, the solution and the treated foamed nickel fibers are put into the reactor together, reacted at 100°C for 10 hours, and annealed at 400°C in air for two hours to obtain foamed nickel / NiCo 2 o 4 Nanowire composite fibrous electrodes (as inner electrodes). Using the same treatment method, the flaky...
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