3results about How to "Excellent performance balance" patented technology

The application relates to a preparation method of a low-cost high-specific-energy battery electrolyte and application thereof and relates to the technical field of lithium metal battery electrolytes. The application realizes the synergistic regulation of the solvation structure of an electrolyte and the electrode interface reaction by constructing a propyl acetate (EP) / fluorinated ethylene carbonate (FEC) / tetrahydrofuran (THF) composite solvent system, taking lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) as a main lithium salt and introducing lithium difluoro(oxalato)borate (LiDFOB) functional lithium salt, so that the cycle stability and the rate performance of a high-nickel positive electrode / lithium metal battery are improved. The low-cost high-specific-energy battery electrolyte prepared by the application has the advantages of a wide electrochemical stability window, excellent interface compatibility and good comprehensive performance balance, still maintains excellent rate capacity output capacity at an extremely low temperature of -30 DEG C, is suitable for the application of high-energy-density lithium metal batteries, and simultaneously shows excellent high-rate capacity retention capacity and long-term cycle stability.

The present invention relates to a cable comprising at least one layer comprising a polypropylene composition; the present invention relates to a polypropylene composition comprising a copolymer of propylene and comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms wherein the polypropylene composition has a total comonomer content (preferably total ethylene content) of from 4.0 to 11.0 wt%, based on the total weight of the polypropylene composition, the content is determined according to the Crystallization Extraction Method (CRYSTEX) by FT-IR spectroscopy calibrated by a quantified 13C-NMR spectrum; a melt flow rate MFR2 of greater than 2.5 to 6.0 g / 10 min as determined according to ISO 1133 at 230 DEG C and a load of 2.16 kg; a soluble fraction (SF) content of from 10.0 to 25.0 wt%, based on the total weight of the polypropylene composition, as determined by Crystallization Extraction Method (CRYSTEX); and a flexural modulus of greater than 470 MPa to 750 MPa as determined according to ISO 178 method A.

This invention belongs to the field of lithium-ion capacitor technology, specifically relating to a lithium-ion capacitor with a porous carbon positive electrode and a hard carbon negative electrode, and its preparation method. Pretreated coal powder and KOH powder are carbonized in a tube furnace at a mass ratio of 1:(3~5) to obtain porous carbon as the positive electrode material; the pretreated coal powder is carbonized in a tube furnace at 1200~1600℃ to obtain hard carbon as the negative electrode material; the positive and negative electrode materials are assembled at a mass ratio of (1~3):1 to obtain a lithium-ion capacitor with good electrical performance. The porous carbon prepared by this invention has a hierarchical pore structure, high specific surface area, and suitable defect density, providing high specific capacitance; the hard carbon prepared by this invention has a composite structure of short-range ordered graphite-like microcrystals and amorphous carbon, which is conducive to rapid lithium-ion insertion / extraction, providing a capacity basis; the appropriate assembly ratio of the porous carbon positive electrode material and the hard carbon negative electrode material effectively improves the overall performance of the lithium-ion capacitor.