Core-sheath flexible graphene fiber supercapacitor, its preparation method and system
A supercapacitor and graphene fiber technology, which is applied in capacitor manufacturing, hybrid/electric double layer capacitor manufacturing, capacitors, etc., can solve problems such as low specific capacitance and energy density, thick gel electrolyte layer, and small electrode contact area. Achieve high specific capacitance, easy amplification, and good flexibility
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[0026] Another aspect of the embodiment of the present invention provides a method for preparing a core-sheath type flexible graphene fiber supercapacitor by direct wet spinning, including: the first liquid flow formed by the spinning solution, the second flow formed by the gel electrolyte aqueous solution The liquid flow and the third liquid flow formed by the spinning solution are simultaneously injected into the coagulation bath, and the first liquid flow is distributed around the second liquid flow, and the second liquid flow is distributed around the third liquid flow, thereby forming a core-sheath type flexible graphene A fiber supercapacitor; wherein, the spinning solution includes uniformly dispersed graphene oxide and a reducing agent, and the aqueous gel electrolyte solution includes a polymer.
[0027] Further, the preparation method may further include: injecting the first liquid flow, the second liquid flow and the third liquid flow into the coagulation bath at the...
Embodiment 1
[0065] (1) the graphene oxide dispersion liquid that concentration is 18mg / ml is mixed with the vitamin C solution that concentration is 150mg / ml by volume ratio 5:1 to prepare spinning solution, for subsequent use;
[0066] (2) Sodium carboxymethyl cellulose was formulated into concentrations of 2mg / ml, 3mg / ml, 4mg / ml, 5mg / ml, 5.5mg / ml, 6mg / ml, 7mg / ml, 10mg / ml, 15mg / ml ml, 20mg / ml sodium carboxymethyl cellulose aqueous solution, for subsequent use;
[0067] (3) The spinning solution prepared in step (1) is injected into the inner cavity and the outer cavity of the coaxial three-layer spinning needle respectively, and the sodium carboxymethyl cellulose aqueous solution prepared in step (2) is injected into the spinning solution. in the middle channel of the needle;
[0068] (4) Control the extrusion speed of the inner layer, the middle layer, and the outer layer to be 0.5, 2, and 10ml / min respectively, and simultaneously inject the spinning solution and the aqueous electrolyt...
Embodiment 2
[0076] (1) Mixing the graphene oxide dispersion and the vitamin C solution in different volume ratios to prepare a series of spinning solutions containing graphene oxide with concentrations of 2, 4, 5, 8, 10, 16, and 20 mg / ml respectively, These spinning solutions all contain the vitamin C of 200mg / ml, standby;
[0077] (2) Polyvinyl alcohol is mixed with the polyvinyl alcohol aqueous solution that concentration is 10mg / ml, for subsequent use;
[0078] (3) A series of spinning solutions prepared in step (1) are injected into the inner cavity and outer cavity of the coaxial three-layer spinning needle respectively, and the sodium carboxymethyl cellulose aqueous solution prepared in step (2) is injected into the spinning needle. In the middle channel of the silk needle;
[0079] (4) Control the extrusion speed of the inner layer, the middle layer and the outer layer to be 0.2, 0.8 and 5ml / min respectively, and simultaneously inject the spinning solution and the aqueous electrol...
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