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

The invention discloses an ionic liquid electrolyte and a lithium battery using the ionic liquid electrolyte, belonging to the related technical field of lithium batteries. The ionic liquid electrolyte includes an ionic liquid, and the ionic liquid is a pyrrolidine ionic liquid containing a long polyether chain segment , can effectively improve the conductivity of the ionic liquid electrolyte, and the preferred voltage window of the pyrrolidine-based ionic liquid electrolyte containing carbonate groups is significantly improved, and the battery using the ionic liquid electrolyte still has Higher capacity retention.

The invention discloses a quasi-solid state electrolyte of a sodium ion battery based on hydrated glass and a preparation method and application thereof. A quasi-solid state electrolyte for sodium ionbatteries based on hydrated glass is prepared by using Na2O-B2O3-SiO2-The hydrated glass of H2O system is used as matrix, sodium salt as admixture, Na2O: B2O3: SiO2: H2O=8-30: 0.5-3:20-70: 2-60, andthat admixture is 0. 5% by weight of the total mass of the admixture 0-10 wt%. 4qqq1) weighing that required matrix raw material, mixing with sodium salt admixture, uniformly stirring, standing, clarify and aging to form a colorless transparent liquid; 2) after 20-350 DEG C, 12-48 h heat treatment, the water content is adjusted and the elastic solid electrolyte is obtained. 3) Performing perfusion-heat seal of viscous liquid electrolyte and the elastic solid electrolyte is assembled by heat-sealing method, and the elastic solid electrolyte is assembled by solidification and hot-pressing method. The central working region with lower Tg and the edge region with higher Tg are formed by secondary heating. The invention has the advantages of good adaptability and stability, low cost, simple operation, easy control and realization of the process, and environment friendliness.

The invention provides a flame retardant organic electrolyte for a rechargeable zinc battery and a rechargeable zinc battery, the flame retardant organic electrolyte for a rechargeable zinc battery includes a soluble zinc salt, a sodium salt electrolyte salt and a flame retardant An organic solvent, the concentration of the soluble zinc salt is 0.1-2 mol / L, and the concentration of the sodium salt electrolyte salt is 0.1-2.5 mol / L. The flame retardant organic electrolyte solution of the present invention has suitable conductivity, viscosity, cation migration rate, high voltage window and excellent flame retardancy, can realize uniform deposition of metal zinc, and improve Zn deposition / precipitation coulombic efficiency and atom utilization rate , showing good electrochemical reversibility and compatibility with cathode and anode materials. The flame retardant organic electrolyte is applied to Zn / / Na 3 V 2 (PO 4 ) 2 o 2 In the F rechargeable zinc battery system, the safety of the battery can be significantly improved, and this zinc battery system has a high discharge voltage platform and good cycle stability, and has broad application prospects.

The invention provides a method for preparing a zinc-cobalt double metal oxide sandwich structure flexible film electrode, based on the vacuum filtration method, (1) dispersing cellulose nanofibrils and multi-walled carbon nanotubes in water, ultrasonic, magnetic Stir to obtain a uniform dispersion of cellulose nanofibrils-multi-walled carbon nanotubes; (2) disperse cellulose nanofibrils and zinc-cobalt double metal oxides in water, ultrasonically and magnetically stir to obtain uniform cellulose Nanofibril-zinc-cobalt double metal oxide dispersion; (3) cellulose nanofibril-multiwall carbon nanotube dispersion and cellulose nanofibril-zinc-cobalt double metal oxide dispersion are successively suction filtered Forming a film to obtain a flexible film electrode with a sandwich structure of coating layer-sandwich layer-coating layer-sandwich layer-coating layer. The invention aims to prepare a high-performance flexible and lightweight electrode material, which has broad application prospects in the fields of portable electronics and energy products.

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.