60results about How to "Electrochemical stability" patented technology

A battery management system is disclosed for control of individual cells in a battery string. The battery management system includes a charger, a voltmeter, a selection circuit and a microprocessor. Under control of the microprocessor, the selection circuit connects each cell of the battery string to the charger and voltmeter. Information relating to battery performance is recorded and analyzed. The analysis depends upon the conditions under which the battery is operating. By monitoring the battery performance under different conditions, problems with individual cells can be determined and corrected.

Disclosed is a porous membrane used for a secondary battery, such as lithium-ion secondary battery, wherein strength is improved and break is difficult to occur while maintaining lithium-ion conductivity. The porous membrane for a secondary battery comprising a binder for the porous membrane and a nonconductive particle, wherein the binder for the porous membrane is a polymer particle having a hetero phase structure, in which internal layer is a polymer wherein vinyl monomer components are polymerized and outer layer is a polymer wherein monomer components containing a hydrophilic functional group are polymerized. The hydrophilic functional group is at least one selected from the group consisting sulfonic acid group, carboxyl group, hydroxyl group and epoxy group.

The invention relates to preparation of a mesoporous carbon nanosheet and application of the mesoporous carbon nanosheet as an electrode material in a super capacitor. According to the method, a porous magnesium oxide nanosheet is used as a template, dopamine is used as a carbon precursor, a carbon source is uniformly coated on the surface of the magnesium oxide nanosheet to form a complex, the complex is carbonized at a high temperature, and the magnesium oxide of the template is removed with excess sulfuric acid solution to obtain a two-dimensional carbon nanosheet. Triblock copolymer PEO-PPO-PEO (Polyethylene Oxide-Polyphenylene Oxide-Polyethylene Oxide) added in a preparation process is used as a structure directing agent to form a mesoporous structure, so that the specific surface area and the pore capacity of the carbon nanosheet are improved and transmission and diffusion of electrolyte ions are facilitated to improve the electric capacity of the material. The coating thickness of the carbon source on the surface of the template can be effectively controlled by adjusting the mass ratio of the template to the carbon source and the polymerization reaction time of the dopamine, and correspondingly the carbon nanosheets with different thicknesses are obtained, so that the electrochemical performance of the carbon nanosheet is affected.

A polymeric gel electrolyte comprising:(a) an acrylic ester polymer matrix containing structural units derived from at least one acrylic ester selected from among acrylic esters represented by the general formulae:(wherein, in the formula (I), R1, R2 and R2' are identical with or different from each other and represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R3 represents an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 100; and, in the formula (II), R4 to R9 are identical with or different from each other and represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and p, q and r are identical with or different from each other and are an integer of 1 to 100); (b) a nonaqueous solvent of a carbonic ester; and (c) a salt of a metal of Group Ia of the periodic table. This polymeric gel electrolyte uses an acrylic ester polymer as a polymeric matrix and contains a specified nonaqueous solvent, so that it exhibits high ionic conductivity and is electrochemically stable. Thus, the polymeric gel electrolyte can suitably be used in electrochemical devices such as a primary battery, a secondary battery, a capacitor and an electrochromic display and in medical actuators.

The invention discloses a preparation method of semi-interpenetrating network gel polyelectrolyte film. The preparation steps are that: firstly, methacryloxypropyl trimethoxy silane is hydrolyzed and crosslinked through a sol-gel method and dimethacrylate ethylene glycol is added to get a mixture; the mixture is mixed with tetrahydrofuranm solution of nitrile rubber and the solution is evaporated to get pre-polyblend film, then pre-polyblend film is solidified by UV-light irradiation to absorb 1M hexafluorophosphate lithium electrolyte solution to prepare the semi-interpenetrating network gel polyelectrolyte film directly. The semi-interpenetrating network ensures the system with better mechanical property, better compatibility between medium polar components in the mixing polymer system and liquid electrolyte, thus the liquid electrolyte is easy to be absorbed for gelation and has relatively high ionic conduction rate. The ionic conduction rate of the prepared semi-interpenetrating network gel polyelectrolyte film can be up to 2.28 is multiplied by 10-3S cm-1 at 30 DEG C and the electrochemical stability is up to 4.6V at room temperature. The invention has simple preparation technique and quick production speed by UV-light irradiation, thereby being applicable to mass industrial production.

The present invention discloses cross-linked polymethacrylic ethylene carbonic acid ester polymer electrolyte membrane and the preparation method. The polymer electrolyte membrane consists of cross-linked polymethacrylic ethylene carbonic acid ester polymer and electrolyte solution including conductive lithium salt and non-protonic solvent. The preparation method adopts carbon dioxide, epoxy dimethylmethane and unsaturated acid anhydride which are synthesized into polymethacrylic ethylene carbonic acid ester trivalent copolymer with special functional group under the role of catalyst dyadic carboxylic acid zinc. Then the trivalent copolymer is under the cross-linking reaction so as to get the dry polymethacrylic ethylene carbonic acid ester polymer membrane. Afterwards, the dry membrane is immerged into the liquid electrolyte solution for activation, thus obtaining the cross-linked polymethacrylic ethylene carbonic acid ester polymer electrolyte membrane. The polymer electrolyte membrane prepared by the present invention has the advantages of high mechanical performance, good thermal performance and high ion electric conduction. The present invention with low cost and simple process is applicable to the industrialized production.

The invention relates to the technical field of energy storage batteries, and provides a lithium difluorobisoxalate phosphate preparation method which includes the steps: dissolving lithium difluoroborate by non-aqueous solvents to obtain first solution; heating the first solution to reach the temperature of 50-130 DEG C, leading phosphorus pentafluoride gas into the first solution and performingreaction to obtain lithium difluorobisoxalate phosphate solution; performing reduced pressure distillation on the lithium difluorobisoxalate phosphate solution and adding inert solvent crystals to obtain lithium difluorobisoxalate phosphate. Raw materials needed by the preparation method are low in cost and easy to obtain, and a reaction product is the lithium difluorobisoxalate phosphate, so thatthe prepared product is high in purify and yield. The technological process of the method is simple, requirements for equipment and environments are low, and the method is suitable for industrial production and application. The invention further provides non-aqueous electrolyte and a battery comprising the same. The non-aqueous electrolyte comprises the lithium difluorobisoxalate phosphate prepared by the method. The non-aqueous electrolyte is good in conductivity and electrochemically stable.

The invention provides an organic compound with a specific structure. The organic compound is characterized by being shown as a general formula (I): the formula (I) is shown in the description; in theformula (I), X1 to X8 are respectively independently selected from CR1 or N respectively, wherein at least one is an N atom; L is a single bond and is C5 to C12 substituted or unsubstituted arylene and heteroarylene; R1 is selected from hydrogen, C1 to C10 aryl or cycloalkyl, C6 to C15 aryl or C6 to C19 condensed ring aryl and at least one is azacarbazole; Ar is substituted or unsubstituted N heterophenyl. The invention discloses an inverse intersystem crossing constant and emission delayed fluorescence rule and the designed compound is used for an organic electroluminescent device, can be used for effectively improving the current efficiency and is an organic electroluminescent material with good performance. The invention also provides the organic electroluminescent device adopting thecompound shown as the general formula.

The invention belongs to the technical field of lithium ion battery materials, and discloses high-voltage electrolyte and a lithium ion battery containing the electrolyte. The high-voltage electrolyte is obtained by adding a functional additive to common electrolyte, wherein the mass of the functional additive is equivalent to 0.1-5% of that of common electrolyte, and the functional additive refers to an alkene dinitrile type compound. According to the high-voltage electrolyte and the lithium ion battery containing the electrolyte disclosed by the invention, the alkene dinitrile type compound containing nitrogen elements and double-bond functional groups is used as a high-voltage film forming additive of the lithium ion electrolyte, the additive is based on the oxidation or the reduction of double bonds, and a layer of compact passivating films can be formed on the surface of a positive pole and the surface of a negative pole in the process of first charge and discharge. Stable cyanogen bases are introduced, so that surface films are stabler in electrochemistry and chemistry. The cycle performance of the lithium ion battery containing the additive of the electrolyte under 3-4.5V is improved, the safety performance and the energy density of the lithium ion battery are improved, and the service life of the lithium ion battery is prolonged.

The invention relates to a method for preparing double-meso-pore ordered mesoporous carbon/ polyaniline nanometer line composite materials and an application thereof. The method includes: using the ordered mesoporous carbon with silica nanometer particles embedded on carbon walls as a carrier, enabling a polyaniline nanometer line array to grow from the inside of a carbon duct to the outside in a chemical oxidative polymerization method, removing silica through hydrofluoric acid to obtain the classified composite materials of double-meso-pore ordered mesoporous carbon/ polyaniline nanometer line composite materials. Small meso pores on a carbon wall of mesoporous carbon can be effectively retained through the method which performs compounding and then removes the silica, specific surface area of the composite materials is improved, migration and diffusion between adjacent ducts of electrolyte ions are facilitated, and the electrochemical performance of the materials is further improved. The method has the advantages of being simple in preparing process, low in cost, capable of controlling the content of polyaniline in the composite materials and capable of being produced in scale mode, and the prepared electrode materials are high in specific capacitance, circulation stability and rate capability.

Provided is a method of producing multiple anode particulates, comprising: a) dispersing an electrically conducting material, primary particles of an anode active material, an optional electron-conducting material, and a sacrificial material in a liquid medium to form a precursor mixture; b) forming the precursor mixture into droplets and drying the droplets; and c) removing the sacrificial material or thermally converting the sacrificial material into a carbon material to obtain multiple particulates, wherein a particulate comprises one or a plurality of anode active material particles having a volume Va, an electron-conducting material, and pores having a volume Vp which are encapsulated by a thin encapsulating layer having a thickness from 1 nm to 10 μm and a lithium ion conductivity from 10⁻⁸ S/cm to 5×10⁻² S/cm and the volume ratio Vp/Va in the particulate is from 0.3/1.0 to 5.0/1.0.

Provided is a lithium battery anode electrode comprising multiple particulates of an anode active material, wherein at least a particulate comprises one or a plurality of particles of said anode active material having a volume Va, an electron-conducting material as a matrix, binder or filler material, and pores having a volume Vp which are encapsulated by a thin encapsulating layer of an electrically conducting material, wherein the thin encapsulating layer has a thickness from 1 nm to 10 μm, an electric conductivity from 10⁻⁶ S/cm to 20,000 S/cm and a lithium ion conductivity from 10⁻⁸ S/cm to 5×10⁻² S/cm and the volume ratio Vp/Va in the particulate is from 0.3/1.0 to 5.0/1.0. If a single primary particle is encapsulated, the single primary particle is itself porous having a free space to expand into without straining the thin encapsulating layer when the lithium battery is charged.

The invention discloses an ionic plastic crystal-polymer-inorganic composite electrolyte membrane and a preparation method and application thereof. The ionic plastic crystal-polymer-inorganic composite electrolyte membrane comprises a porous organic-inorganic composite membrane and an ionic plastic crystal electrolyte composite material, the porous organic-inorganic composite membrane has a continuous three-dimensional network structure, the ionic plastic crystal electrolyte composite material is distributed on the surface of the three-dimensional network structure and/or in contained holes, and the ionic plastic crystal electrolyte composite material comprises an ionic plastic crystal compound and a lithium salt. The ionic plastic crystal-polymer-inorganic composite electrolyte membrane disclosed by the invention has the advantages of simple preparation process, excellent mechanical strength, high ionic conductivity, wide electrochemical stability window, lithium dendritic crystal inhibition, high temperature resistance, flame retardance and the like.

The invention relates to the technical field of lithium ion battery manufacturing, and especially a method for preparing a sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material. The method comprises the following steps: adding citric acid, lithium hydroxide, sodium hydroxide and ferrous oxalate into water, stirring and dissolving, performing oil bath and forming a deep green solution; and adding nanosilicon dioxide to obtain a sol, spray drying to obtain a precursor of the sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material, and calcinating in argon to obtain the sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material. The method for preparing the sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material provided by the invention is simple and safe in process, low in cost, and the obtained sodium-doped lithium ferrous silicate/carbon nano-micro structure composite cathode material is uniform in particle distribution and excellent in electrochemical performance.

The invention discloses a method for preparing aromatic monomer products through degradation of lignin; the method takes sulfate pulp lignin as a raw material, an ionic liquid as a reaction medium and oxygen as an oxidant, and adopts the following product processes: dissolving the lignin in the ionic liquid, carrying out oxygen oxidation degrading, extracting with an organic solvent, and concentrating to obtain the aromatic monomer products. The oxidation products are aromatic compound monomers mainly containing aromatic aldehydes, acids and ketones. Compared with a traditional water medium oxidation system strong alkali, the aromatic method not only overcomes pollution problems to the environment, but also has the product concentration significantly higher than that of a traditional strong alkali oxidation system. The yield of the monomer aromatic products adopting the reaction system is more than 3 times that of traditional strong alkali oxidation products.

The invention provides a carbon-selenium composite material, a preparation method thereof, and an application of the same in a lithium-selenium battery. Compared with the prior art, in the preparationmethod of the carbon-selenium composite material, the two-dimensional carbon material is wide in raw material source, simple and easy to obtain, so that the preparation method is simple, the practical degree is high, and the obtained carbon-selenium composite material shows excellent electrochemical performance. The two-dimensional carbon material is prepared by adopting a one-step hydrothermal reaction; the two-dimensional carbon material contains rich micro-mesoporous structures and has a high graphitization degree, so that when the two-dimensional carbon material and selenium are subjectedto low-temperature compounding and activation to obtain the carbon-selenium composite material, elemental selenium in the carbon-selenium composite material is uniformly loaded in micro-mesopores inthe surface of the two-dimensional carbon material, and the loading rate reaches up to 80%; as a result, the carbon-selenium composite material is used as a positive electrode material to be assembledto obtain the lithium-selenium battery with electrochemical stability.

The invention discloses a solid electrolyte sheet and a preparation method of a sulfide solid electrolyte sheet. The solid electrolyte sheet comprises a plurality of skeletons and a solidified solid electrolyte, the skeletons are embedded in the solid electrolyte, the skeletons are crossed, and pores are arranged among the skeletons; the preparation method comprises the following steps: mixing Li2S and P2S5 raw materials according to a set molar ratio, carrying out ball milling to obtain mixed powder, grinding the mixed powder in a protective atmosphere, sealing the ground mixed powder in a vacuum environment, and carrying out heat treatment to obtain electrolyte powder; and placing the solid electrolyte sheet and the polymer fiber skeletons in a tabletting mold, and performing tablettingin a protective atmosphere to obtain a sulfide solid electrolyte sheet. According to the structure of the solid electrolyte sheet, the strength of the solid electrolyte can be improved, the preparation success rate of the electrolyte sheet is improved, the sulfide solid electrolyte sheet prepared by adopting the polymer fiber skeletons has high strength and structural stability, the thickness of the solid electrolyte sheet is reduced, and the possibility is provided for further preparing a high-energy-density sulfide all-solid-state battery.