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 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 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 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 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.