35results about How to "Good lithium conduction performance" patented technology

The invention relates to the field of solid electrolyte membranes, in particular to a method for preparing a synchronous substrate-supported solid composite electrolyte membrane, comprising the following steps: a. Extruding ultra-high molecular weight or high-density polyolefin molten state slurry to form a cast film; b. The solid electrolyte molten slurry is evenly extruded on the surface of the cast sheet film at a temperature T1 to form a solid electrolyte coating to obtain a solid electrolyte coating-cast sheet substrate; c. solid electrolyte coating-cast sheet substrate at temperature Stretching is carried out in T2 to obtain a film; d. The stretched film is subjected to hot-pressing and setting to control thickness, and cooled to obtain a solid composite electrolyte membrane. By controlling the tensile parameters, the impregnation effect of the solid electrolyte on the porous carrier can be adjusted to form a continuous lithium-conducting channel, improve the lithium-conducting ability of the composite electrolyte, and avoid the subsequent separate impregnation steps, which can effectively improve the production efficiency of the composite electrolyte membrane.

The invention provides an electrolyte solution for a lithium-rich manganese-based positive electrode material system battery and a lithium ion battery. The electrolyte solution includes a solvent, an electrolyte lithium salt and an additive, and the additive includes fluoroethylene carbonate, thiophene-2-methoxy boronic acid pinacol ester and bis(2,2,2-trifluoroethyl) carbonate. The electrolyte solution of the invention is applied to the lithium-rich manganese-based lithium ion battery, which can improve the interface compatibility between the electrolyte solution and the positive and negative electrodes, and improve the high-temperature and high-pressure cycle performance of the lithium-ion battery. Moreover, the preparation method is simple, easy to industrialize, and has broad application prospects.

The invention discloses a separator for a lithium-sulfur battery, comprising: a conductive layer composed of a conductive carbon material, flaky tungsten disulfide and a first binder, an insulating layer composed of a second binder, and the insulating layer is arranged on One side of the conductive layer; the conductive layer is used to limit the shuttle effect of polysulfides, and provides sufficient space and sites for the nucleation and growth of sulfur, and the insulating layer is used to block the positive and negative electrodes. Direct contact and short circuit between them, while improving the mechanical strength of the separator, is beneficial to the large-scale production and application of the separator. The invention also discloses a preparation method of a lithium-sulfur battery diaphragm. The first binder and the second binder are initially dissolved in acetone, and then the first binder is dissolved by adding N-methylpyrrolidone or heating. Melting with the second binder into a long-chain structure, reducing the crystallinity of the separator and improving the mechanical properties of the separator.

The invention discloses a nonaqueous electrolytic solution, a preparation method thereof and an application in a lithium ion battery. The non-aqueous electrolytic solution comprises lithium salt, organic solvent and additive, and described organic solvent comprises chain carbonate, cyclic carbonate, silane-substituted cyclic carbonate and fluorine-containing ether diluent; Said additive comprises lithium difluorophosphate , cyclic sulfate, tris(2,2,2-trifluoroethyl) phosphate. The lithium-ion battery prepared by the non-aqueous electrolyte of the present invention can improve the fast charging rate performance and cycle performance on the basis of maintaining a conductivity of more than 8.5 mS / cm, and the capacity retention rate after 500 cycles can still be 92% at the same time. % or more, it has excellent battery fast charging performance and cycle performance, and the self-extinguishing time is below 2s / g, with excellent flame retardancy, which can further improve the safety performance of lithium-ion batteries and can be widely used in lithium-ion batteries. battery.

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium salt and a functional additive, wherein the functional additive comprises 4,4'-dipinacol borate diphenyl sulfone, dipyridyl carbonate and lithium difluorophosphate. When the electrolyte provided by the invention is applied to a lithium ion battery of ahigh-nickel ternary material / graphite system, the impedance of the lithium ion battery can be remarkably reduced, the power performance of the lithium ion battery can be improved, gas production of the lithium ion battery in circulation and storage processes can be remarkably inhibited, and the rate capability, the normal-temperature cycle performance, the high-temperature cycle performance, thehigh-temperature storage performance and the safety performance of the lithium ion battery are remarkably improved.