11results about How to "Improve interface contact performance" patented technology

The invention belongs to the field of lithium ion battery materials, and discloses an organic composite solid electrolyte which comprises a negative electrode side solid electrolyte and a second solid electrolyte attached to one side surface of the negative electrode side solid electrolyte, the negative electrode side solid electrolyte comprises a first lithium salt, PTCDA (3, 4, 9, 10-tetracarboxylic anhydride) and a polymer; and the second solid electrolyte comprises a second lithium salt and a polymer. In the circulation process, PTCDA in the solid electrolyte spontaneously reacts with the lithium metal to form an organic SEI film, so that the interface contact between the lithium metal and the solid electrolyte is improved. And PTCDA molecules contain a large number of carbonyl groups, so that lithium ion binding sites are increased, the conductivity of lithium ions in the electrolyte is increased, the internal resistance of the battery is reduced, and the cycling stability of the battery is improved.

The invention relates to the technical field of synthetic resin, in particular to biodegradable synthetic resin and a preparation method thereof.The synthetic resin is a three-layer co-extrusion film composed of an outer layer, a middle layer and an inner layer; the outer layer is prepared from the following components: racemic polylactic acid, ethyl cellulose, a silane coupling agent KH-560 and carnauba wax; the middle layer comprises the following components: PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), cellulose aerogel, epoxy oleic acid pentaerythritol ester, liquid paraffin and stearic acid; the inner layer is prepared from the following components: polyhydroxyalkanoate, poly-L-lactic acid, ethylene-acrylate-maleic anhydride copolymer, acetyl tributyl citrate, TMP (trimethylolpropane) and tert-butylhydroquinone. The PLA and the PBAT are used as main materials of the middle layer, the cellulose aerogel and the epoxy oleic acid pentaerythritol ester are compounded to serve as the compatilizer, the interfacial compatibility of the PLA and the PBAT is improved, the product uniformity is good, and the mechanical property is excellent.

The invention discloses a flexible transparent film lithium ion battery and a preparation method thereof, and belongs to the field of flexible transparent energy storage devices. The lithium ion battery comprises a positive pole piece, a negative pole piece and a transparent polymer semi-solid electrolyte membrane positioned between the positive pole piece and the negative pole piece, the positive pole piece comprises an Au mesh / PET (Polyethylene Terephthalate) current collector substrate and a LiMn2O4 (at) MWCNTs positive active material layer sprayed on the surface of the Au mesh / PET current collector substrate; the negative electrode plate comprises an Au mesh / PET current collector substrate and a Li4Ti5O12-coated MWCNTs negative electrode active material layer sprayed on the surface of the Au mesh / PET current collector substrate; the transparent polymer semi-solid electrolyte membrane is a PVDF-HFP / PMMA (Polyvinylidene Fluoride-HFPP / Polymethyl Methacrylate)-based gel polymer electrolyte membrane and comprises LiTFSI (LiTFSI) and EMImTFSI. The flexible transparent film lithium ion battery prepared by the invention is of a semi-solid laminated structure, has the advantages of high flexibility, high transparency, excellent cycle performance, rate capability, high bending resistance and the like, and has a good application prospect.

The invention relates to the technical field of hydrogen storage materials, and particularly discloses a slurry-like hydrogen storage material and a preparation method thereof.The slurry-like hydrogen storage material is prepared by mixing metal hydride, a liquid organic hydrogen carrier and an additive, and the preparation method includes the steps that one of magnesium hydride (MgH2), sodium-aluminum hydride (NaAlH4) and calcium hydride (CaH2) is selected as the metal hydride, and the other one of magnesium hydride (MgH2), sodium-aluminum hydride (NaAlH4) and calcium hydride (CaH2) is selected as the additive; one of methyl cycloolefin (MCH) and tetrahydronaphthalene is selected as a liquid organic hydrogen carrier, and polyvinyl alcohol (PVA) or polyurethane (PU) is selected as an additive. According to the preparation method disclosed by the invention, by optimizing the compounding ratio of the metal hydride to the liquid organic hydrogen carrier, enhancing interface contact, improving the stability of the material and strictly controlling storage and operation conditions, the problems of hydrogen storage capacity, hydrogen storage efficiency, stability and the like of a traditional slurry hydrogen storage material are solved, and the hydrogen storage material has relatively good performance and relatively high hydrogen storage capacity.

The present invention relates to the field of battery technology, and specifically to a method for preparing a solid-state battery by double-initiation two-stage polymerization, wherein at least one of a positive electrode sheet, a negative electrode sheet, and a separator is pre-compounded with a precursor slurry and then subjected to a first-stage polymerization; the precursor slurry comprises a monomer, an electrolyte salt, a co-initiator, and a cross-linking agent; the co-initiator comprises an initiator A and an initiator B, wherein the initiator A is an inorganic filler capable of accepting electron pairs, and the initiator B is a thermal initiator; a battery cell is formed by compounding in the order of positive electrode sheet-diaphragm-negative electrode sheet, or in the order of positive electrode sheet-negative electrode sheet, and then a second-stage polymerization is carried out after encapsulation to obtain a solid-state battery; wherein at least one of the positive electrode sheet, the separator, and the negative electrode sheet used in the encapsulated battery cell is subjected to the first-stage polymerization treatment of step (1). The present invention also includes a battery obtained by the preparation method. The method of the present invention can solve the problem of poor quality stability of existing solid-state batteries, and can also improve the performance of the prepared battery.

The invention belongs to the field of battery materials, and discloses a high-performance composite positive electrode material and a preparation method and application thereof.The preparation method of the high-performance composite positive electrode material comprises the steps that an MOF material and a flaky conductive carbon material are mixed through ball milling, then a solid electrolyte material is added for continuous ball milling, then the positive electrode material is added for continuous ball milling, roasting is conducted in the inert atmosphere, and the high-performance composite positive electrode material is obtained. Obtaining a finished product. An electron-ion-active material interpenetrating structure is formed by the MOF material, the sheet-shaped conductive carbon material and the solid electrolyte material, so that the interface contact can be improved, the stability of the composite positive electrode can be improved, the cycle life of the battery can be remarkably prolonged, and the requirements of the long-cycle-life solid-state lithium metal battery can be met.

The invention provides a solid electrolyte and a battery. The solid electrolyte comprises a multipolymer and a modified electrolyte, wherein the multipolymer comprises a cyano structural unit, an organic acid structural unit and an acrylate structural unit; the modified electrolyte comprises electrolyte particles and polydopamine located on the surfaces of the electrolyte particles. According to the solid electrolyte provided by the invention, the surfaces of the electrolyte particles are coated with the polydopamine coating layer, so that the modified electrolyte has negative electricity and is prevented from being agglomerated in the multi-component copolymer, and hydrogen bonds are formed between N, O and reactive hydrogen in the polydopamine coating layer and the multi-component copolymer; and the binding force between the multipolymer and the modified electrolyte is improved.

The present application relates to a kind of encapsulation piezoresistive sensor and the preparation method of composite adhesive material.The preparation method of the composite adhesive material is by the composite material one including nano-conductive material and polymer porous sponge, lower part is loaded in the composite material two including nano-conductive material and PDMS film, then put into vacuum drying oven and with 50-80 ℃ heat preservation 10-60 min, to prepare composite adhesive material.The interface contact between the lower adhesive film and the upper porous sponge of the prepared composite adhesive material is good, with good piezoresistive performance.The encapsulation piezoresistive sensor utilizes composite adhesive material to realize adhesive connection, adopts the structure without introducing external packaging, with higher stability, while having high sensitivity and wide measurement range.

The invention provides a lithium iron phosphate battery and a preparation method thereof, the lithium iron phosphate battery comprises: (1) a gradient structure positive plate, the positive plate comprises a current collector, an inorganic solid electrolyte interface layer arranged on the current collector, and a positive active material layer, the positive active material layer comprises an inner layer and an outer layer, the inner layer is close to the inorganic solid electrolyte interface layer, the outer layer is close to the diaphragm, the compaction density of the inner layer is larger than that of the outer layer, and the conductive agent content of the inner layer is smaller than that of the outer layer; (2) a negative plate; (3) a diaphragm; and (4) performing in-situ polymerization to form a solid electrolyte phase. The gradient structure design is introduced into the positive plate, that is, the inner layer adopts relatively high compaction density and relatively low conductive agent content, and the outer layer adopts relatively low compaction density and relatively high conductive agent content, so that the electronic conductivity and the ion transmission efficiency can be effectively considered.

The invention discloses an organic semiconductor material, a preparation method, application and a perovskite solar cell, and belongs to the technical field of organic semiconductor materials and solar cells. An organic semiconductor material having a specially designed structure is provided. By introducing the rigid side arm structure, the conjugate length of the core unit is effectively prolonged, and the carrier transport capability of the hole transport material can be effectively enhanced; particularly, heteroatoms such as oxygen, sulfur and selenium contained in the rigid side arm structure can form a coordination effect with lead atoms in the perovskite, so that multiple effects of passivating defects, namely assisting the crystallization of the perovskite material and the like are achieved; when the perovskite solar cell is prepared, the rigid structure may slow down the aggregation of molecules in a solution and the diffusion rate on a substrate, so that the crystallization process is more uniformly regulated and controlled, the formation of a large-area, high-quality and low-defect-density perovskite thin film is facilitated, pinhole and grain boundary defects are reduced, and the performance of the perovskite solar cell is improved.

The invention belongs to the field of lithium ion battery materials, and discloses a lithium metal negative electrode and a preparation method and application thereof, and the preparation method of the lithium metal negative electrode comprises the following steps: mixing a first lithium salt, PTCDA (3, 4, 9, 10-perylenetetracarboxylic dianhydride) and a first solvent to prepare a solution A, spraying the solution A on one side surface of a lithium sheet, and drying to obtain the lithium metal negative electrode. The PTCDA and the first lithium salt are used for modifying the lithium sheet of the lithium battery, an SEI film can be generated on the surface of the lithium sheet, the interface contact performance of the solid electrolyte and the lithium sheet can be improved, and the safety performance of the battery can be improved.