30results about How to "Raise the voltage window" patented technology

The invention provides a Li-ion supercapacitor. The active material of a positive plate of the Li-ion supercapacitor comprises a porous carbon material and LiNixCoyMnzO2; the porous carbon material is at least one of active carbon, an active carbon fiber, porous graphitized carbon black and graphene; the ratio of the porous carbon material to LiNixCoyMnzO2 is (1:1)-(1:4), wherein x+y+z=1, x:y:z=5:2:3 or x:y:z=5:3:2 or x:y:z=6:2:2 or x:y:z=7:1.5:1.5 or x:y:z=8:1:1; the active material of a negative plate is at least one of synthetic graphite, interphase graphite, mesocarbon microbeads, hard carbon and soft carbon; the mass ratio of the LiNixCoyMnzO2 contained in the positive plate to the active material contained in the negative plate is 0.5-1.6; the electrolyte of the Li-ion supercapacitor consists of an electrolyte salt and an organic solvent; the electrolyte salt is selected from LiPF6 or LiBF4 or LiBOB or LiFSI; and the organic solvent is at lest one of ethylene carbonate, carbonic allyl ester, carbonic methyl ester, methyl carbonate, diethyl carbonate and acetonitrile.

This patent discloses a high-voltage flame-retardant electrolyte formula, which is applied to lithium-ion secondary batteries. The main feature of the invention is that phosphoric acid ester is used as a solvent component, which forms a solvation structure with lithium salt in a certain ratio, and is dispersed in a fluoroether solvent. Phosphate ester coordinates with lithium ions to form a certain solvation structure, which effectively prevents co-intercalation of graphite with lithium ions. By introducing fluoroether, the viscosity of the electrolyte is reduced, the wettability of the electrolyte is increased, and the thermal and electrochemical stability of the electrolyte are not affected, and the fluoroether is also non-flammable and does not affect the electrolyte flame retardant effect. The electrolyte solution provided by the invention can form a dense and stable protective film on the surface of the positive electrode and the negative electrode, and the capacity retention rate of the NCM 811||Li half-cell after 200 cycles reaches more than 90%, and at the same time, it has good compatibility with graphite. Using this electrolyte can significantly improve the high-voltage cycle stability of the electrolyte and battery safety.

A preparation method of a low-temperature solid-state electrolyte and its application in a low-temperature solid-state supercapacitor, adding acetone to polyvinylidene fluoride-hexafluoropropylene PVDF-HFP, fully dissolving to obtain a transparent viscous solution A, adding electrolyte to the solvent Salt, mix evenly to get electrolyte solution B, mix solutions A and B evenly to get precursor solution C, scrape or cast the precursor solution on a clean and smooth substrate, and get 20-100um low-temperature solid state after natural drying Electrolyte membrane, the solid electrolyte prepared by the present invention has high electrical conductivity at low temperature, and the preparation method is simple and easy, and has wide applicability; the low temperature solid electrolyte is applied to the preparation of low temperature solid supercapacitor, and the prepared solid supercapacitor has a low working temperature To -60°C, it has excellent rate performance, low internal resistance, high energy density and long cycle life at low temperature, which broadens the application of low-temperature solid-state supercapacitors in military or civilian fields.

The invention relates to a preparation method of an extensible asymmetric supercapacitor based on Ag / PPy / MnO2 composite nano-materials. The preparation method is characterized in that the prepared Ag / PPy / MnO2 composite nano-materials have the advantages of excellent capacitive performance, preferable flexibility, high stability, low cost and preferable printability; extensible fabric base materials with super flexibility are selected; and by means of a screen printing mode, silver paste, the synthetic Ag / PPy / MnO2 composite nano-materials, active carbon and PVA-Na2SO4 solid electrolyte are printed into a flexible solid state asymmetric supercapacitor. The energy density of the asymmetric supercapacitor prepared by the preparation method can achieve 30.9 mu Wh cm-2; after 2,5000 times of constant current charge and discharge, the capacitance retention rate of the asymmetric supercapacitor is 90.8%; after 40% of extension, the capacitance retention is 89.2%; and at the same time, the prepared asymmetric supercapacitor can maintain preferable flexibility and mechanical performance under different flexible conditions (extension, warping, curving and bending), and a red 2.8V LED lamp canbe lightened under the above conditions.