40results about How to "Wide electrochemical stability window" patented technology

The invention discloses a high voltage-resistant multi-stage structure composite solid-state electrolyte and its preparation method and use in a solid-state lithium battery. The lithium battery utilizes a multi-stage structure solid-state electrolyte containing different components. A polymer electrolyte with excellent electrode interface compatibility is used as an electrolyte in the negative electrode side. A high voltage-resistant polymer electrolyte is used as an electrolyte in the positive electrode side. A polymer electrolyte or an inorganic electrolyte with high ionic conductivity is used as a middle layer. The multi-stage structure solid-state electrolyte has advantages such as high mechanical properties, high ionic conductivity, a wide electrochemical window, excellent electrode interfacial compatibility and lithium dendrite growth inhibition of different components. Compared with the traditional liquid lithium ion battery, the battery with the multi-stage composite solid-state electrolyte has higher safety and higher energy density.

The invention discloses a lithium ion battery gel type ionic liquid / polymer electrolyte and a preparation method thereof, relating to a gel type ionic liquid / polymer electrolyte and a preparation method thereof. The invention solves the problem of poor compatibility of the prior imidazole ionic liquid and a lithium ion battery cathode material. The electrolyte is made of a macromoleclar polymer, imidazole ionic liquid and lithium salt. The method comprises the following steps: 1. dissolving the macromoleclar polymer into organic solvent; 2. adding the imidazole ionic liquid and stirring till the solution is uniform; 3. adding the lithium salt to obtain gel liquid; 4. pouring the gel liquid into a die, drying in vacuum and demolding. The electrolyte has favorable compatibility with a lithium titanate cathode; a lithium ion battery made of the electrolyte has high safety, and the lithium titanate cathode presents ultrahigh specific capacity (more than a double of the theoretical specific capacity) and two charging and discharging platforms in the electrolyte. The invention has simple method and technology, low cost and convenient operation.

An electrolyte for an electrochemical storage device is disclosed. In one embodiment, the electrolyte includes a lithium salt from about 3% to about 20% by weight, a primary solvent from about 15% to about 25% by weight, wide-temperature co-solvents from about 14% to about 55% by weight, interface forming compounds from about 0.5% to about 2.0% by weight, and a flame retardant compound from about 6% to about 60% by weight. The electrolyte interacts with the positive and negative electrodes of the electrochemical storage device to provide both high performance and improved safety such that the electrolyte offers adequate ionic conductivity over the desired operating temperature range, a wide electrochemical stability window, high capacities for both the cathode and anode, low electrode-electrolyte interfacial resistance, and reduced flammability.

The present invention provides a lithium-ion electrochemical cell comprising an ionic liquid electrolyte solution and a positive electrode having a carbon sheet current collector.

The invention discloses a cellulose based gel polymer electrolyte and a preparation method thereof, and a lithium ion battery containing the electrolyte. The gel polymer electrolyte is obtained by absorbing an organic electrolyte solution with a cellulose porous membrane or a cellulose composite porous membrane with a nanopore structure and then gelating. The cellulose porous membrane or cellulosecomposite porous membrane is obtained by a dissolving and regeneration method, the thickness is 20-200 [mu]m, the average pore size is less than 50 nm, the porosity is 30-98%, the tensile strength is3-80 MPa, and the dimensional thermal stability is good; the cellulose based gel polymer electrolyte obtained by adsorbing the organic electrolyte solution and gelating has the advantages of high ionic conductivity, wide electrochemical stability window and the like and is suitable for lithium ion batteries with high performance and high safety.

The invention provides ether electrolyte. The ether electrolyte comprises lithium salt and an organic solvent, wherein the organic solvent comprises one or more of 1,2-dimethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether. The ether electrolyte has advantages that the ether electrolyte is unlikely to volatize, the oxygen dissolving degree is high, the electrochemical stable window is wide, and the like, and has excellent chemical stability for a discharging intermediate product O2<-1> or LiO2 and a discharging final product Li2O2. The lithium air battery prepared by utilizing the ethers electrolyte is excellent in long cycling stability. The experimental result shows that a charging-discharging curve is not obviously changed after the lithium air battery assembled by utilizing the ether electrolyte is circularly charged and discharged for 30 times at a limit capacity of 1,000mAh / g under the current density of 100mA / g.

The invention discloses a technical method for electrodepositing metallic lead layers on metallic copper and an alloy thereof, metallic titanium and an alloy thereof as well as metallic aluminum and an alloy thereof by using an ionic liquid system as an electrolyte. Compared with an ordinary technology for electrodepositing metallic lead, the technical method has the advantages that the technical method can be carried out at room temperature, has no steam volatilization, no color or taste, no combustion, no hydrogen release, good thermal stability and chemical stability, wider electrochemical stability windows (3-5V), compact coated layers and small internal stress, and can achieve higher current efficiency (more than or equal to 90 percent). The technical method has the biggest advantage of acquiring lead coated layers which can not be acquired on the metallic aluminum and an alloy substrate material thereof in a conventional technology. The method has simple process, short flow, easy control and lower cost.

The invention relates to a preparation method of a polymer coated lithium ion battery electrode material. The method comprises the steps as follows: (a) fluorine-containing or chlorine-containing polyolefin is dissolved in an organic solvent to form a macromolecular solution; (b) an inorganic electrode material is immersed in the macromolecular solution, and filtration and drying are performed after stirring; (c) a product in step (b) is subjected to heat treatment under the vacuum or inert gas condition at the temperature of 100-220 DEG C. The surface of the lithium ion battery electrode material is coated with polymer macromolecules with a liquid phase impregnation method, one thin and compact polymer coating layer is formed on the surface of the material, and after being subjected to heat treatment at proper temperatures, the coating layer does not dissolve in conventional slurry dispersing agents (water and N-methyl pyrrolidone) and cannot be damaged in the following slurry making process; the polymer coating layer contributes to release of internal stress produced by volume expansion and contraction of the electrode material, and the problems of electrode active substance particle powdering and active substance loss are solved.

The present invention provides a lithium-ion electrochemical cell comprising an ionic liquid electrolyte solution and a positive electrode having a carbon sheet current collector.

The invention belongs to the field of solid-state lithium batteries, and particularly discloses a lithium ion solid electrolyte thin film and an application thereof, and can be used for preparing a secondary solid lithium battery. The lithium ion solid electrolyte thin film is composed of 60-90wt% of lithium ion solid electrolyte ceramic powder, 5-20wt% of phase change agent and 5-20wt% of crown ether lithium salt. The lithium ion solid electrolyte thin film is prepared by adopting a phase change technology, a coating method and a solution impregnation method. Compared with a common lithium ion solid electrolyte thin film, the lithium ion solid electrolyte thin film disclosed by the invention has the advantages that the composition is mainly composed of ceramic powder, does not contain a polymer gel electrolyte and is free of sintering, so that that the thin film is high in ionic conductivity, the lithium metal is stable, the electrochemical window is wide, the high temperature resistance is high, the preparation is simple, and the thickness is uniform and controllable, and the like. The lithium ion solid electrolyte thin film can be used for preparing a secondary solid lithium-airbattery and a solid lithium ion battery.

The invention relates to a doped phosphorus-sulfur iodide solid electrolyte and a preparation method and an application thereof. A general chemical formula of the solid electrolyte is Li<6-x>M<x>P<1-x>S<5>I, x is larger than 0 and smaller than 0.8, and M is tungsten and / or molybdenum. The method comprises steps of 1) mixing a lithium source, a phosphorus source, an iodine source, a sulfur source and an M source in an inert atmosphere, and performing ball milling to obtain a solid electrolyte precursor; and 2) sintering the solid electrolyte precursor obtained in the step 1) in the inert atmosphere or in vacuum to obtain the doped phosphorus-sulfur iodide solid electrolyte. The ionic conductivity of the solid electrolyte can reach 1.0*10<-3>S / cm or above, and an electrochemical stability window is wide; the preparation method is simple, the raw materials are easily available, the synthesis process is simple, and the synthesized electrolyte crystal structure is good; an all-solid-state battery assembled by the material has advantages of high energy density, good cycling stability and wide application prospect.

The invention relates to a lithium-ion battery electrolyte which comprises the following components in parts by weight: 80-88 parts of solvents, 12-15 parts of electrolyte lithium salt and 0.5-3 parts of a first additive, wherein borate oxalate is used as the first additive and borate oxalate and lithium salt form a compound with high thermal stability so as to form the lithium-ion battery electrolyte capable of resisting against high temperature. The lithium-ion battery electrolyte provided by the invention is prepared according to a specific formula, the thermal stability is high, the high temperature resistance is effectively promoted, the lithium-ion battery electrolyte has a high temperature resisting property and the application scope is greatly promoted.

The invention relates to a method for electrolytic synthesis of siloxane, belonging to the technical field of organosilicon chemistry. The method disclosed by the invention comprises the following steps of carrying out an electrolysis reaction on minerals containing SiO2 and an alkylating agent as raw materials at room temperature and normal pressure in an electrolyte solution comprising an aprotic polar organic solvent and an electrolyte by an electrolytic cell or an electrolytic bath with a cathode and an anode and synthesizing to obtain the silicone-containing materials, and finally the separating siloxane in the silicone-containing materials to obtain siloxane products. According to the method for electrolytic synthesis of siloxane, production costs and energy consumptions are greatly reduced, the production efficiency is improved; no pollution to the environment is generated and the synthesis process is environment friendly; a plurality of silicone products are obtained by flexibly choosing alkylating agents. The method disclosed by the invention has the advantages of high converted rate and product quality.

The invention belongs to the solid electrolyte field, and provides an all-solid electrolyte which includes a polycaprolactone-based block copolymer, a lithium salt and a porous rigid material membrane, and the mass ratio of the polycaprolactone-based block copolymer and the lithium salt is (50-90): (10-50). As can be seen from the result of the example, the ionic conductivity of the all-solid electrolyte is 1.2x10<-5>-4.3x10<-4>S / cm, the electrochemical window reaches 4.5 ~ 5V and the lithium ion migration number reaches 0.4 ~ 0.6. The invention also provides a preparation method of the all-solid electrolyte. The preparation method of the invention has the advantages of simple operation, strong practicability and easy implementation. The invention also provides a lithium battery comprisingthe all-solid electrolyte or the all-solid electrolyte obtained by the preparation method.

The invention relates to a polymer, and a preparation method and application thereof. The polymer has a structural formula as shown in the specification. In the structural formula, the polymer is prepared by using a mixture of methyl methacrylate, acrylonitrile and butyl acrylate as a monomer through polymerization; meanwhile, the mass ratio of methyl methacrylate to acrylonitrile to butyl acrylate in the monomer is (4-1): (4-1): (2-1). The polymer provided by the invention is used for preparing a gel polymer electrolyte, enables the gel polymer electrolyte to have high electrochemical stability window, shows a longer cycle life compared with a traditional carbonate liquid electrolyte battery after applied to a lithium ion battery with a voltage level of 5 V, and is an ideal electrolyte matching with a high-voltage cathode material.

The invention discloses an in-situ polymerization polycaprolactone-based all-solid-state electrolyte as well as a preparation method and application thereof. The method comprises the following steps of adding lithium salt and inorganic additive particles into methoxy polycaprolactone acrylate to obtain a mixed solution; adding a photoinitiator into the mixed solution, and uniformly mixing to obtain a mixture; and coating a pole piece with the mixture in an inert atmosphere, and carrying out in-situ polymerization reaction under the irradiation of an ultraviolet lamp to obtain the in-situ polymerization polycaprolactone-based all-solid-state electrolyte. The branched structure of the all-solid-state electrolyte is compounded with the polymer material particles, so that the all-solid-state electrolyte has high mechanical strength, high ionic conductivity, high ionic migration number and wide electrochemical window, and has certain biodegradability. According to the all-solid-state electrolyte, an in-situ polymerization preparation method is adopted, the pole piece is directly coated with a precursor, and the free radical polymerization is carried out under the initiation of the ultraviolet light to obtain the solid-state electrolyte, so that the technological conditions are simple, the high efficiency and convenience are achieved, the solvation is avoided, and no pollution is caused to the environment.

The invention is applicable to the technical field of lithium ion batteries and provides high-voltage lithium ion battery electrolyte, an additive and a preparation method. The electrolyte additive isketene and has main functional groups of carbon-carbon double bonds, carbonyl and siloxy groups, the additive and electrolyte component materials are mutually reacted to form a layer of a protectionmembrane on the surface of an electrode material, the membrane is capable of alleviating reactions of hydrofluoric acid generated from reactions of a trace amount of water in a battery with lithium hexafluorophosphate, with the electrode material, then the metallic ion dissolution of an electrode can be alleviated, and the coulombic efficiency and the circulation performance of the battery at a high voltage can be improved; on the other hand, an electrochemical stability window of the electrolyte is widened, then the electrolyte is hard to oxidize in the use process, and the security of the battery can be improved.

The invention relates to a water-ether mixed electrolytic solution for a lithium ion battery, and a preparation method thereof, and belongs to the technical field of lithium secondary batteries. According to the invention, the mixed electrolytic solution is obtained by mixing a lithium salt, water and an ether solvent, and has relatively low viscosity, relatively high ionic conductivity and a relatively wide electrochemical stability window; the mixed electrolytic solution and an electrode material can generate a compact SEI film, so that a positive electrode and a negative electrode are protected against corrosion, normal charging and discharging of a common commercial electrode material can be guaranteed, and the electrochemical performance of the common commercial electrode material isimproved; and the preparation process of the mixed electrolytic solution is simple, the raw materials are easy to obtain, safe and pollution-free, and the mixed electrolytic solution is suitable for large-scale batch production.

The invention belongs to the technical field of lithium batteries, and particularly relates to an electrolyte of a negative-electrode-free secondary lithium battery, the negative-electrode-free secondary lithium battery and a formation process. The liquid electrolyte takes lithium sulfimide and fluoro alkoxy lithium trifluoroborate as main lithium salts, takes a carbonate compound-organic fluorinecompound as an organic solvent system, and a functional additive is added into the system. The invention also discloses a formation process of the negative-electrode-free secondary lithium battery, namely, the negative-electrode-free secondary lithium battery is formed at a certain high temperature (40-100 DEG C), a certain pressure (0-3 MPa) and a certain vacuum degree (0--0.1 MPa). The negative-electrode-free secondary lithium battery provided by the invention has the advantages of high energy density, high safety, long cycle life and the like.

The invention discloses an in-situ polymerized polycaprolactone-based all-solid electrolyte as well as a preparation method and application thereof. The method comprises: adding lithium salt and inorganic additive particles into methoxy polycaprolactone acrylate to obtain a mixed liquid; adding a photoinitiator into the mixed liquid and mixing evenly to obtain a mixture; under an inert atmosphere, coating the mixture Covering on the pole piece, the in-situ polymerization reaction is carried out under the irradiation of ultraviolet light to obtain the in-situ polymerization polycaprolactone-based all-solid-state electrolyte. The branched structure of the all-solid-state electrolyte of the present invention and its combination with polymer material particles make it have high mechanical strength, high ion conductivity, high ion transfer number and wide electrochemical window, and has a certain biological Degradability. The all-solid-state electrolyte of the present invention uses an in-situ polymerization preparation method. The precursor is directly coated on the pole piece, and the solid-state electrolyte is obtained by free radical polymerization under ultraviolet light triggering. The process conditions are simple, efficient and convenient, and there is no solvation and no pollution to the environment.

The invention belongs to the technical field of batteries, and particularly relates to a carbonic ester-based electrolyte with an ether oxygen bond functional group and application of the carbonic ester-based electrolyte. The carbonic ester-based electrolyte with the ether oxygen bond functional group comprises a carbonic ester solvent, a lithium salt and an additive, wherein the molecular structure of the carbonic ester solvent contains an ether oxygen bond. The electrolyte has a high boiling point and a high flash point, the high-temperature performance of the battery can be improved, the self-extinguishing time of the electrolyte is shortened, and the safety of the battery is further improved. In addition, the electrolyte has good compatibility with a traditional graphite negative electrode, solvent co-intercalation does not occur, and it is guaranteed that the lithium ion battery has excellent cycle stability. Moreover, the electrolyte has excellent interface stability with the metal lithium, and the dissolution-deposition efficiency of the metal lithium can be greatly improved, so that the cycle life of the lithium metal battery is prolonged. The carbonic ester-based electrolyte has a good application prospect in the fields of lithium ion batteries and lithium metal batteries.

The invention relates to a gel-type polymer electrolyte and a preparation method thereof. The gel-type polymer electrolyte membrane is prepared by using amine terminated nitrile rubber as a matrix of the solid electrolyte, dissolving the matrix, lithium salt, epoxidized polysilsesquioxane, and 1-butyl-3-methylimidazolium trifluoro methane sulfonate in an organic solvent, pouring the solvent on a teflon template, and carrying out heat treatment in a baking oven after volatilizing tetrahydrofuran. Compared with the prior art, the operation is simple; the membrane forming is easy; and the prepared membrane is smooth and uniform, has good mechanical properties, high room-temperature conductivity, and stable electrochemical window, and the prepared membrane used as solid electrolyte materials for the lithium ion battery has an application prospect.

The invention discloses a high voltage-resistant multi-stage structure composite solid-state electrolyte and its preparation method and use in a solid-state lithium battery. The lithium battery utilizes a multi-stage structure solid-state electrolyte containing different components. A polymer electrolyte with excellent electrode interface compatibility is used as an electrolyte in the negative electrode side. A high voltage-resistant polymer electrolyte is used as an electrolyte in the positive electrode side. A polymer electrolyte or an inorganic electrolyte with high ionic conductivity is used as a middle layer. The multi-stage structure solid-state electrolyte has advantages such as high mechanical properties, high ionic conductivity, a wide electrochemical window, excellent electrode interfacial compatibility and lithium dendrite growth inhibition of different components. Compared with the traditional liquid lithium ion battery, the battery with the multi-stage composite solid-state electrolyte has higher safety and higher energy density.

The invention discloses a preparation method of a super capacitor with an asymmetric three-dimensional fork comb micro-column array electrode structure, which belongs to the field of micro super capacitors. The super capacitor adopts ICP etching, laser engraving and other micro-nano processing technologies to design and prepare the fork comb micro-column array electrode structure. A layer of gold is sputtered on the surface of the fork comb micro-column array electrode structure to serve as a current collector, and then pseudocapacitor and double-electrode-layer capacitor material films are deposited on the surfaces of the positive electrode micro-structure and the negative electrode micro-structure respectively, so that the asymmetric micro MEMS supercapacitor is prepared. Through the fork comb type micro-column array electrode structure, the specific surface area of the electrode is effectively increased, meanwhile, the asymmetric supercapacitor system can integrate energy storage mechanisms of a double-electric-layer capacitor and a pseudocapacitor, an electrochemical stable window can be widened, the energy storage density of a device can be increased, and the structure can be applied to the fields of node power supplies of the Internet of Things, personal electronic products and the like.

The invention discloses a preparation method of silk protein eutectic gel as well as a product and application thereof, the preparation method comprises the following steps: (1) removing impurities from natural silkworm cocoons to obtain silk fibroin, dissolving the silk fibroin in a LiBr aqueous solution to form a uniform aqueous solution, and dialyzing, concentrating and drying to obtain silk protein powder; (2) mixing the silk protein powder prepared in the step (1) with hexafluoroisopropanol to obtain slurry; and (3) scraping the slurry on release paper or pouring the slurry into a mold, and soaking the release paper in a eutectic solvent to solidify into a film, so as to obtain the fibroin eutectic gel. The raw materials adopted by the preparation process disclosed by the invention are green, environment-friendly and low-price materials, and have good environmental stability and friendliness; the prepared fibroin eutectic gel can be used as a solid electrolyte to be applied to preparation of an electrochemical energy storage device, or can be directly used as a mechanical sensor.

The invention discloses a preparation method of a wide-temperature-range electrolyte for a supercapacitor, which comprises the steps of 1, uniformly adding a solute into ethylene glycol, and heating to a temperature of 70-120 DEG C at a heating speed of 3-10 DEG C / min while adding the solute; 2, putting the solution obtained in the step 1 into a container with a micro-bubble generator, and starting the micro-bubble generator; and 3, putting the solution obtained in the step 2 into a disc separator, discharging slag, and collecting a settled material to obtain the wide-temperature-range electrolyte for the supercapacitor. The electrolyte composed of tetramethyl ammonium bromide, tetraethylammonium bromide, tetrapropylammonium bromide, tetrabutylammonium bromide and ethylene glycol can effectively regulate and control hydrogen bonds in the solution, is used as a supercapacitor, and has the characteristics of wide electrochemical stability window and wide operation temperature zone.

The invention relates to high-voltage-resistant lithium ion battery electrolyte and a lithium ion battery. The high-voltage-resistant lithium ion battery electrolyte is prepared from organic solvents,lithium slats, inorganic film forming additives and anti-overcharging protection additives, wherein the organic solvents are prepared from vinyl carbonic ester, ethyl methyl carbonate, tetramethylenesulfone, tri(2,2,2-trifluoroethyl)phosphite ester and methyl ethyl ketone according to the mass ratio of (4 to 8):(3 to 7):(3 to 5):(1 to 3):(1 to 2). The high-voltage-resistant lithium ion battery electrolyte has the advantages that the safety of the lithium ion battery is improved; the electrochemical performance of the lithium ion battery is improved, so that the battery performance is excellent.

The invention relates to a composite polymer porous film which contains a polymer, can be subjected to thermal decomposition to obtain a gaseous compound at a low temperature and may contain inorganic adding particles. The method comprises the following steps: a casting film solution which can be subjected to thermal decomposition at a low temperature to form the gaseous compound is added to prepare a wet film, the wet film is dried at 40-90 DEG C in vacuum atmosphere, air atmosphere or other atmospheres, and the gas which can be subjected to thermal decomposition at a low temperature to formthe gaseous compound, in the casting solution is used to form pores and obtain the porous film. After the obtained polymer electrolyte film is soaked in an EC-DMC-EMC lithium salt solution to soak, activate and plasticize, the film has good electrochemical property. The obtained polymer electrolyte film has good mechanical strength and flexibility, high ionic conductivity and good electrochemicalproperty; and industrial production is easy to realize.

The invention belongs to the solid electrolyte field, and provides an all-solid electrolyte which includes a polycaprolactone-based block copolymer, a lithium salt and a porous rigid material membrane, and the mass ratio of the polycaprolactone-based block copolymer and the lithium salt is (50-90): (10-50). As can be seen from the result of the example, the ionic conductivity of the all-solid electrolyte is 1.2x10<-5>-4.3x10<-4>S / cm, the electrochemical window reaches 4.5 ~ 5V and the lithium ion migration number reaches 0.4 ~ 0.6. The invention also provides a preparation method of the all-solid electrolyte. The preparation method of the invention has the advantages of simple operation, strong practicability and easy implementation. The invention also provides a lithium battery comprisingthe all-solid electrolyte or the all-solid electrolyte obtained by the preparation method.

The invention belongs to the field of solid-state lithium batteries, and specifically discloses a lithium-ion solid-state electrolyte film and an application thereof, which can be used for preparing secondary solid-state lithium batteries. The lithium ion solid electrolyte film is composed of 60 wt.%-90 wt.% lithium ion solid electrolyte ceramic powder, 20 wt.%-5 wt.% phase change agent and 20 wt.%-5 wt.% crown ether lithium Salt composition, prepared by phase transition technology, coating method and solution impregnation method. Compared with common lithium-ion solid-state electrolyte films, the advantages of the lithium-ion solid-state electrolyte films disclosed by the present invention are: the composition is mainly based on ceramic powder, and does not contain polymer gel electrolyte; sintering-free; high ion conductivity ; stable to lithium metal; wide electrochemical window; good high temperature resistance, simple preparation, uniform and controllable thickness, etc. The lithium-ion solid-state electrolyte film can be used to make secondary solid-state lithium-air batteries and solid-state lithium-ion batteries.