103results about How to "Improve long-cycle performance" patented technology

The invention discloses a rapidly discharged / charged high power lithium ion battery and a manufacturing method thereof. The positive current collector comprises an aluminum foil and a conductive coating. The negative current collector comprises a copper foil and a conductive coating. The diaphragm is a PE material, which is bidirectionally and synchronously stretched, and ceramic oxide is paintedon the surface of the PE material. The anode paste comprises following components in parts by weight: 10 to 35 parts of lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate,lithium manganese phosphate, lithium iron manganese phosphate, or lithium vanadium phosphate, 62 to 81 parts of nickel cobalt lithium manganate, 1 to 3 parts of Ketjen black or carbon nanotube, and 1to 3 parts of graphene or Super-P and modified 1,3-polyvinylidene fluoride. The cathode paste comprises following components in parts by weight: 55 to 75 parts of artificial graphite or meso-phase carbon micro beads, 20.5 to 36 parts of soft carbon or hard carbon, 1 to 2 parts of CMC, 2 to 4 parts of Super-P, and 1.5 to 3 parts of styrene butadiene rubber SBR or polystyrene-acrylate. The providedlithium ion battery can continuously discharge or charge (30C). The 30C constant current charge capacity can account for 70% or more of 1C capacity, and the 30C discharge capacity can account for 90%or more of 1C capacity.

The invention discloses a high-voltage lithium ion battery combined electrolyte additive, an electrolyte and a battery thereof. The high-voltage lithium ion battery combined electrolyte additive provided by the invention is prepared by mixing a compound containing cyclic thioester, a compound containing P-O and Si-O bonds and a compound which does not contain Si-O / P-O bonds but contains B-O bonds,and under a high voltage, a component A is oxidized and decomposed at an interface of a positive electrode to form a stable CEI film and is reduced on a surface of a negative electrode to generate astable SEI film so that efficiency of a battery can be improved; by adding a component B, wettability of the electrolyte to the electrode can be improved, a stable CEI film can be formed on the surface of the positive electrode, and the efficiency of the battery is further increased while the wettability is improved; and through a component C, a B-O-containing interface film can be formed on the surfaces of the positive electrode and the negative electrode, the B-O interface film has high ionic conductivity, an impedance of the battery can be significantly reduced, polarization of the batteryis decreased, and cycle performance is improved.

The invention discloses an HIFU (high intensity focused ultrasound) controlled-release targeted nanometer drug delivery system of brain glioma, and a preparation method and application of the targeted nanometer drug delivery system. The drug delivery system comprises targeting molecules, a drug, a foaming agent and a nano-carrier, wherein the targeting molecules are Angiopep-2 short-peptide, the drug is adriamycin, the foaming agent is perfluorooctane, and the nano-carrier is a high molecular material which is modified by terminal carboxyl and has polylactic acid-glycolic acid copolymer as a main ingredient; the drug and the foaming agent are wrapped and loaded in the nano-carrier together in a wrapping manner; and the targeting molecules are connected to nano-particle surfaces through a covalent linkage manner. The drug delivery system disclosed by the invention can target and highly express the blood brain barrier of an LRP (low-densitylipoprotein receptor-related protein) receptor and brain glioma cells; the accumulation of the drug at a brain glioma position is effectively improved; after the drug is fully accumulated, HIFU irradiation is given to induce the drug to be instantly and fully released at the brain glioma position; the drug concentration in the brain glioma cells is greatly improved; therefore, the treatment effect of the brain glioma is obviously improved; and meanwhile, the toxic and side effect of the drug on normal tissue is effectively reduced.

The invention relates to a graphite composite material as well as a preparation method and application thereof. The graphite composite material is of a core-shell structure and comprises a secondary particle inner core and a second hard carbon coating layer on the surface of the secondary particle, wherein the secondary particles comprise a plurality of primary particles, and each primary particlecomprises a first hard carbon coating layer. In the graphite composite material provided by the invention, the hard carbon coating layer formed on the surface layer of the primary particle is tightlybonded with the inner core of the particle, no gap exists between the coating layer and the inner core, and the thickness consistency of the coating layer is high; the hard carbon coating layer of the secondary particle shell is beneficial to stabilizing the primary particle accumulation structure, and is beneficial to the long cycle performance of the material; the first hard carbon coating layer formed on the surface layer of the primary particle and the second hard carbon coating layer formed on the surface layer of the secondary particle can accelerate the desolvation process of lithium ions, so that lithium ions can be inserted into graphite more quickly; and according to the graphite composite material, the capacity can be ensured, and meanwhile, the quick charge and cycle performance can be greatly improved.

The invention relates to a solid-state electrolyte, particularly to a high-cohesiveness solid-state electrolyte prepared through in-situ curing, and a preparation method thereof, and a secondary lithium battery composed of the solid-state electrolyte, wherein the raw materials of the high-cohesiveness solid-state electrolyte mainly consist of a hydroxyl-terminated oligomer, an isocyanate-terminated compound and a lithium salt, and the high-cohesiveness solid-state electrolyte is prepared by uniformly mixing and stirring the hydroxyl-terminated oligomer, the isocyanate-terminated compound and the lithium salt, adding the mixture into a battery core and carrying out in-situ polymerization and curing under a heating condition. According to the invention, the electrolyte prepared by in-situ curing has high adhesive force, and is cured under heating, so that the positive electrode, the negative electrode and the electrolyte are tightly attached, the interface impedance between the electrolyte and the positive electrode and the interface impedance between the electrolyte and the negative electrode are reduced, and the effect of improving the rate capability and the cycle performance of the battery is achieved; and the preparation process of the solid-state lithium battery is greatly simplified, the interface contact is optimized, the danger caused by dislocation is prevented, and thesafety of the battery is improved.