A kind of supercapacitor, negative pole and preparation method thereof
A supercapacitor and negative electrode technology, applied in the field of new generation energy storage, can solve the problems of limiting the specific capacity and energy density of asymmetric supercapacitors, the difficulty of supercapacitors to meet the demand, and the cumbersome preparation process, so as to avoid the decline of mechanical strength and improve the cycle. Stability, effect of slowing material dissolution
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[0037] The preparation method of above-mentioned negative pole, comprises the following steps:
[0038] S1. Under the sealed condition, the conductive substrate is embedded in MnO 2 In the precursor solution, heat at 85°C to 120°C for 15min to 360min to obtain 2 conductive substrate, wherein the MnO 2 including flake MnO 2 and linear MnO 2 ; The MnO 2 The pH value of the precursor solution is 0-3, including MnO with a concentration of 0.02M-0.2M 4 - ;
[0039] S2. will be attached with MnO 2 The conductive substrate is immersed in 0.34% to 3.4% sugar solution for 1h to 24h, so that the attached MnO 2 A conductive substrate with an average mass of 0.00034g / m attached 2 ~0.034g / m 2If the concentration of the sugar solution is too high, the quality of the attached sugar will increase, so that the amorphous carbon layer is too thick and the specific capacity of the electrode will decrease; otherwise, the amorphous carbon layer will be too thin and affect its cycle stabil...
Embodiment 1
[0060] S1. Use carbon cloth as a conductive substrate, clean the carbon cloth with acetone, ethanol, and water for 10 minutes, take it out and soak it in 20ml of concentrated hydrochloric acid for 5 minutes, and use it as a flexible substrate. Dissolve 1mmol potassium permanganate and 0.5ml concentrated hydrochloric acid in 35ml deionized water to obtain MnO with a concentration of 29mM and a pH value of 0.7 2 Precursor solution;
[0061] Dip carbon cloth into MnO 2 Precursor solution, and transferred to the lining of the autoclave, put into the oven at 85 ° C for 2 h respectively. After the reaction, cool down to room temperature naturally, take out the sample and wash it three times with deionized water, and dry it in vacuum at 40°C for 6h to obtain MnO 2 / carbon cloth sample;
[0062] S2.3.42g sucrose was dissolved in 100ml deionized water to obtain a sugar solution with a concentration of 3.4%, and the MnO 2 / Soak the carbon cloth sample in the solution for 12 hours,...
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