A lithium-ion supercapacitor with high energy and high power density and its assembly method
A supercapacitor, high power density technology, applied in the direction of capacitors, electrolytic capacitors, liquid electrolytic capacitors, etc., can solve the problems of difficult to reach the energy storage level of secondary batteries, power density limitations, etc., to achieve energy density improvement, high power density, The effect of high energy density
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Embodiment 1
[0027] Graphene (oxygen content 6.5at%, specific surface area 412m 2 / g) made into positive and negative electrode sheets, and electrochemically pre-intercalated lithium on two graphene electrode sheets respectively. The positive plate is discharged at a constant current to 1.16V relative to metal lithium and held for more than 12 hours; the negative plate is subjected to constant current cycle charge and discharge at 0.01~1.16V relative to metal lithium until the charge and discharge capacity remains stable, and finally constant current discharge To the vicinity of 1.16V relative to metal lithium and keep the pressure for more than 12h. The positive and negative electrode sheets that have been pre-intercalated with lithium are assembled into a sandwich structure lithium ion supercapacitor.
[0028] The energy storage performance of the lithium-ion supercapacitor and its positive and negative electrodes after pre-intercalating lithium on the electrode is as follows: figure 1 ...
Embodiment 2
[0031] Hierarchical pore carbon (oxygen content 10.5at%, specific surface area 1169m 2 / g, medium / large pores accounted for 68%) were made into positive and negative electrode sheets, and electrochemically pre-intercalated lithium on two graphene electrode sheets respectively. The positive plate is discharged at a constant current to 1.22V relative to metal lithium and held for more than 12 hours; the negative plate is charged and discharged at a constant current cycle at 0.01~1.22V relative to metal lithium until the charge and discharge capacity remains stable, and finally constant current discharge To the vicinity of 1.22V relative to metal lithium and keep the pressure for more than 12h. The positive and negative electrode sheets that have been pre-intercalated with lithium are assembled into a sandwich structure lithium ion supercapacitor.
[0032] Such as image 3 The constant current charge and discharge curves of the hierarchical porous carbon-based lithium-ion super...
Embodiment 3
[0034] Multi-walled carbon nanotubes (diameter2 / g, oxygen content 4.5at%) were made into positive and negative electrode sheets, and electrochemically pre-intercalated lithium on two graphene electrode sheets respectively. The positive plate is discharged at a constant current to 1.12V relative to metal lithium and kept at a pressure of more than 12h; the negative plate is charged and discharged at a constant current cycle at 0.01~1.12V relative to metal lithium until the charge and discharge capacity remains stable, and finally constant current discharge To the vicinity of 1.12V relative to metal lithium and keep the pressure for more than 12h. The positive and negative electrode sheets that have been pre-intercalated with lithium are assembled into a sandwich structure lithium ion supercapacitor.
[0035] Such as Figure 4 The constant current charge and discharge curves of the multi-walled carbon nanotube-based lithium-ion supercapacitor at different rates are shown. It c...
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