4results about How to "Increase liquid absorption" patented technology

This invention relates to the field of battery separators, specifically to a high-heat-resistant, high-absorbency ceramic separator, its preparation method, and its application. The invention introduces hydroxyl-containing polymers into the coating. Because hydroxyl-containing polymers have good affinity for electrolytes, the ceramic separator exhibits excellent liquid absorption performance, thereby effectively improving the cycle performance of the battery cell. Furthermore, by introducing a boron-containing crosslinking agent into the coating, the borate ions in the inorganic boric acid aqueous solution can act as crosslinking agents to form hydrogen bonds with the hydroxyl-containing polymers, resulting in a crosslinking reaction. Additionally, the copolymerization of 4-vinylphenylboronic acid and ethylene glycol diethylene ether in the organic boric acid solution can form a six-membered ring at high temperatures. Therefore, a three-dimensional network structure is formed within the system over a wide temperature range, improving the skeletal strength of the ceramic separator coating and ensuring both high liquid absorption and improved temperature resistance of the ceramic separator.

The application discloses a kind of battery separators of chitosan aerogel microspheres and CNF composite and preparation method thereof, belong to lithium ion battery technical field.The battery separator includes polyolefin porous base film and the coating layer of at least one side surface of the base film;The coating layer is formed by coating and drying by coating slurry including chitosan aerogel microspheres and CNF;The chitosan aerogel microspheres are porous particles formed after chitosan is crosslinked, freeze-dried and crushed.The application constructs light, multistage pore structure coating layer by chitosan aerogel microspheres and CNF composite, significantly improves the wettability of electrolyte, liquid absorption rate and liquid retention rate of separator under the premise of extremely low weight gain, and has good thermal stability, effectively solves the contradiction that traditional ceramic coating weight and wettability cannot be compatible.

The utility model discloses a kind of high-temperature-resistant batteries, including positive plate, negative plate and the composite separator being set between positive, negative plate, it is characterized in that, the composite separator includes a group of PE separator, two groups of glass fiber separators and two groups of AGM separators, the utility model is placed in the two ends of composite separator by AGM separator with excellent liquid absorption, there is enough electrolyte around pole plate under the different working conditions of battery, glass fiber separator auxiliary electrolyte distribution, when cooperating with AGM separator, glass fiber separator can assist AGM separator to better adjust the distribution of electrolyte, prevent electrolyte excessive gathering or dry in local area, PE separator is placed in the middle, using its good barrier property, so that electrolyte maintains relatively stable distribution state inside battery, reduce acid stratification phenomenon, improve the service life and performance stability of battery.

The application provides a preparation method of a gel polymer electrolyte for energy storage frequency modulation and an integrated battery, and belongs to the technical field of lithium ion secondary batteries and electrochemical energy materials, and can at least partially solve the problems of the existing gel polymer electrolyte, such as the contradiction between mechanical properties and ionic conductivity, poor interface compatibility, weak lithium dendrite inhibition ability, and insufficient thermal stability and flame retardancy. The gel polymer electrolyte prepared by constructing a dynamic covalent cross-linked polyimide-polyionic liquid interpenetrating network and using monatomic iron-anchored phosphorus-doped carbon nitride nanosheets as a multifunctional filler has excellent mechanical properties and high ionic conductivity, and the flame retardancy is greatly improved, and the growth of lithium dendrites can be effectively inhibited. Meanwhile, the integrated battery is prepared by using an ultraviolet light-initiated in-situ polymerization process, which is suitable for the roll-to-roll large-scale production line of existing lithium batteries, and the interface bonding force of the battery is strengthened, the cycle stability is improved, and the high-frequency response requirement of energy storage frequency modulation is met.