773results about How to "Increase specific energy" patented technology

The invention provides a method for cladding surfaces of an active material of an anode and/or the anode and methods for manufacturing the anode and a battery. In the cladding method, an atomic layer deposition technology is adopted to deposit surface modification substances on the surfaces of the active material of the anode and/or the anode of a lithium battery. According to the invention, the cycle performance and the specific capacity of the lithium-ion battery can be improved obviously and electrode materials are more stable.

The invention relates to a lithium ion battery silicon-based composite anode material, a preparation method of the lithium ion battery silicon-based composite anode material, and a battery. The lithium ion battery silicon-based composite anode material adopts an embedded composite core-shell structure, a core has a structure formed by embedding nano silicon particles into a gap of an inner layer of hollowed graphite, and a shell is made from a non-graphite carbon material. According to the silicon-based composite anode material, mechanical grinding, mechanical fusing, isotropic compression processing and carbon coating technologies are combined, so that the nano silicon particles can be successfully embedded into the inner layer of the graphite and the surfaces of graphite particles are uniformly coated; the high-performance silicon-based composite anode material is obtained and is excellent in cycle performance (the 300-times cycle capacity retention ratio is more than 90%) and high in first efficiency (more than 90%); in addition, the silicon-based composite anode material is high in specific energy and compaction density, and can meet the requirements of a high-power density lithium ion battery; the preparation process is simple, the raw material cost is low, and the environment is protected.

The present invention is directed to a novel capacitor. The capacitor may be used in electric double layer capacitors. The capacitors include a polarizable electrode including activated carbon and a non-polarizable electrode including lead dioxide and lead sulfate. The capacitors of the present invention provide considerably higher electric capacity, higher durability, and low resistance, while maintaining high conductivity. Additionally, the electrodes may be produced more quickly and inexpensively.

The invention relates to a nano carbon material with a network structure consisting of polymer chains, in particular to a nano carbon sulfur composite material with a network structure suitable to be used in a secondary lithium sulfur battery anode and a preparation method thereof. The carbon sulfur composite material is formed by adopting the following steps of: introducing functional groups onto carbon particles by adopting the electric conductivity and the porosity of a carbon material and the reaction capacity of similar condensed aromatics of the carbon material and by means of an irreversible chemical reaction; introducing the polymer chains, wherein the polymer chains are stretched, bent and cross-linked on the surfaces of the carbon particles to form a cross-linked network structure; and compounding a sulfur element or a polysulfide (m is more than 2) containing -Sm- structure into the network structure to form the nano carbon sulfur composite material with the network structure. The carbon sulfur composite material has a rich cross-linked network structure, nano-scale network pores constrain the sulfur element or the polysulfide (m is more than 2) containing the -Sm- structure in the network, and the active substances are limited in a certain region to react, so that the composite material has predominant electrochemical performance.

The invention discloses a lithium-sulphur battery anode material, which adopts the technical scheme that elemental sulphur or lithium sulfide is loaded into one or various carrier materials to form a novel composite electrode for a lithium-sulphur battery. The carrier material (s) is (are) characterized in that within the operation voltage range of the elemental sulphur or the lithium sulfide, the carrier material (s) is (are) also provided with electrochemical activity, that is, is (are) provided with considerable lithium storage capacity, and simultaneously has (have) characteristics of high specific surface and high porosity. The invention also discloses a preparation method of the lithium-sulphur battery anode material. The system of the electrode solves problems that the carrier material of a conventional lithium-sulphur battery anode material is not provided with the electrochemical activity and is low in composite material specific capacity within the operation voltage range of the elemental sulphur or the lithium sulfide, and the integral specific capacity of the composite electrode and the energy density of the lithium-sulphur battery are improved.

The invention relates to a carbon-sulfur-shell matter composite material having a network dual-core shell structure and a preparation method thereof. The carbon-sulfur-shell matter composite material has a carbon-sulfur-shell three layer structure, a central core (inner core) is nano carbon particles, sulfur elemental or a polysulfide containing-Sm-structure (m>2) is directly deposited on the nano carbon particles, or functional groups are introduced onto the nano carbon particles by use of polycyclic aromatic hydrocarbon like reaction capacity of the carbon material and through an irreversible chemical reaction, polymeric chains are introduced in, a crosslinked network structure is formed through stretching, bending and crosslinking of the polymeric chains on the surface of the nano carbon particles, the sulfur elemental or the polysulfide containing the-Sm-structure (m>2) is composited onto the crosslinked network structure to form a nano sulfur layer having a network structure, then a mono-core shell nano composite material having a network structure is obtained and is used as a second layer (outer core) of the carbon-sulfur-polymer composite material having the network dual-core shell structure, an outermost layer is a shell matter layer, electronic and/or ionic conductivity of the material are/is improved, dissolving loss of discharge products can be further inhibited, and structural stability of the material is improved. The material is suitable for positive poles of lithium sulfur batteries, and has a prominent effect on improvement of cycle stability of the lithium sulfur batteries.

A carbon nanotube paper is prepared from carbon nanotubes through adding them to acid, heating or thermal reflux, and/or ultrasonic stirring, removing impurity, diluting in water, filtering, washing the filtered cake, dispersing the carbon nanotubes in water by ultrasonic stirring, spreading on carrier, and drying. It has regular structure, high uniformity, purity and electric conductivity, and enough mechanical strength.

This invention relates to the plus plate lead paste of lead-acid battery comprising (by weight percentages based on lead powder): lead powder 100%, 1.4g/cm3 sulfuric acid 8-12%, deionized water 9-11%, lead dioxide 3-4.2%, short fiber 0.05-0.06%, carbon fiber 0.10-0.15%, anisotropic graphite 0.2-0.4% and bismuth oxide 0.05-0.11%. In this invention, on the based on certain water and acid content in the active substance, additional positive pole active substances are added such as anisotropic graphite and bismuth oxide or the like. The changed components improve the primary battery volume and the ratio of weight/energy with prolonging battery service life.

The invention discloses a preparation method for a nitrogen-doped porous carbon sphere-sulfur composite positive material. The preparation method comprises the following steps of: performing spray pyrolysis on a nitrogen-containing carbon source, silica sol and de-ionized water to obtain a spherical nitrogen-doped pyrolytic carbon-silicon dioxide composite, adding the composite into excessive hydrofluoric acid for reaction, and washing and drying the reactants to obtain nitrogen-doped porous carbon spheres; and adding a sulfosalt solution into the nitrogen-doped porous carbon spheres under a vacuum condition, adding glycerin, which is taken as a dispersing agent, into the carbon spheres, adding an acid solution to the carbon spheres under magnetic stirring, and filtering and washing the mixture, and performing vacuum drying on the washed mixture to obtain the nitrogen-doped porous carbon sphere-sulfur composite positive material. The sulfur content of the prepared composite material is 50 to 90 percent, sulfur particles are more uniformly distributed in porous structures of the porous carbon spheres, and carbon and sulfur particles are more closely bound. The material is high in mechanical stability, specific discharge capacity and cycle performance. The method is simple in process, easy to operate, pollution-free and suitable for industrial implementation and batch production.

A nonaqueous system electrochemical mixed capacitor using lithium cell material as positive electrode is prepared as combining ion embedding ¿C deembedding mechanism of lithium cell with double electric layer mechanism in a power accumulator, using LiMn2 ¿C x MxO4 material as positive electrode and using active carbon with high specific surface area as negative electrode to form asymmetric electrochemical capacitor.

The invention relates to a high-specific-energy/high-specific-power type super battery, consisting of a positive electrode, a negative electrode, a diaphragm between the positive electrode and the negative electrode, and organic electrolyte, wherein the positive electrode is formed by parallel connection of two types of electrode pieces, i.e. an electrode piece which adopts a lithium-ion-embedded compound in a lithium ion battery as an active material and an electrode piece of a porous carbon material in a double electric layer super capacitor, the negative electrode adopts a negative electrode carbon material of the lithium ion battery, and the electrolyte is of an organic solvent containing lithium ion salt electrolyte. The high-specific-energy/high-specific-power type super battery has high energy density and power density simultaneously, wherein the specific energy can be up to 50-110wh/kg, and the power density can be up to 450-8000w/kg; and the high-specific-energy/high-specific-power type super battery can be widely applied in the fields such as electric automobiles, electric tools, solar energy storage, wind energy storage, portable household appliances and the like.

The invention provides an internally combined super capacitor which comprises an anode, a cathode, a diaphragm and electrolyte. The internally combined super capacitor is characterized in that the anode and the cathode are composed of active substances and perforated current collectors, the active substance of the anode is a mixture containing built-in lithium metal oxide and active carbon, and the active substance of the cathode is hard carbon. According to the internally combined super capacitor, through the energy storage potential matching technology of the anode and the cathode, the current collectors of the anode and the cathode respectively adopt perforated cathode foil and perforated copper foil, and electrochemical pre-doping of lithium ions is performed on the hard carbon of the cathode through a third electrode, so that the initial charged state of the hard carbon reaches 30% to 80%. According to such a finally obtained super capacitor battery, the characteristics of high specific power, long service life and quick charge of the super capacitor are kept, and the specific energy is greatly increased. Compared with a traditional lithium ion capacitor, the internally combined super capacitor has a great application prospect, and the characteristic of the super long cycle life is reserved. The working voltage of the internally combined super capacitor can reach 4.2 V, the specific energy can reach about 50 Wh/kg, the specific power can reach about 10, 000 W/kg, and the cycle life can reach 50, 000 times.

The invention discloses composite electrode materials for a high power lithium secondary battery and a preparation method thereof. The composite electrode materials take lithium-storage active material as an inner core, conductive polymer as an outer shell, the active material inner core is mainly used for carrying out electrochemical reaction and providing main capacity for a battery, the conductive polymer material is used as a conductive agent and an adhesive when preparing electrodes, and simultaneously provides a certain amount of battery capacity by electrochemical doping and undoping reaction. By using the composite electrode materials for preparing electrodes, adhesive and conductive agent with electrochemical inertia can not be used or be used in a small amount, and the lithium secondary battery based on the composite electrode materials has high specific capacity and fine rate performance.

The invention relates to a lithium-sulfur flow battery and a positive electrode electrolyte thereof, as well as a preparation method of the positive electrode electrolyte. The lithium-sulfur flow battery comprises a battery module, the positive electrode electrolyte, a negative electrode electrolyte, a positive electrode electrolyte storage tank, a circulating pump and a circulation line, wherein the battery module is formed by connecting a single cell or more than two single cells in series, the single cell comprises a negative electrode current collector, a lithium negative electrode, a diaphragm, a positive electrode, a positive electrode current collector and a sealing element, and the positive electrode electrolyte which is a mixed solution of Li2S8 containing nano sulfur powder and lithium trifluoromethanesulfonate or trifluoromethane sulfonic acid lithium imide is filled in the positive electrode electrolyte storage tank, wherein the solvent is a mixed solvent which comprises tetraethylene glycol dimethyl ether or glycol dimethyl ether and 1,3-dioxolane at a volume ratio is (1:5)-(5:1) is taken as a solvent. Compared with a traditional lithium-sulfur battery, the lithium-sulfur flow battery has the advantages that the cycle life and the charge and discharge power are improved; an independent positive electrode electrolyte storage tank structure is adopted, so that the capacity is not controlled by an electrode area.

The invention discloses a three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode and a preparation method thereof. The three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode comprises the following steps of 1) carbonizing melamine foam in an inertia atmosphere to obtain a nitrogen-rich lithium-loving three-dimensional self-supported carrier; and 2) packaging metal lithium in holes of the three-dimensional self-supported carrier to obtain the metal lithium composite negative electrode. Carbon sponge obtained by carbonization of melamine foam is used as a metal lithium carrier, and the metal lithium composite negative electrode has effects of guiding metal lithium to be uniformly deposited and preventing dendrite from being generated. Lithium-loving functional groups are uniformly arranged on the carrier, a lithium-loving coating layer is deposited on a hole surface of the carrier, the lithium-loving performance of the carrier is improved, the volume change of the metal lithium electrode during the circulation process is effectively buffered, moreover, the lithium-loving functional groups uniformly arranged on the three-dimensional carrier are used as active sites for metal lithium deposition, the nucleation over-potential is reduced, uniform nucleation of metal lithium can be effectively controlled, so that the dendrite generation is prevented.

The invention discloses a method for recycling and preparing lithium iron manganese phosphate from positive electrode materials of waste lithium iron phosphate batteries. The method comprises the following steps: (1) discharging remnant electric quantities of the waste lithium iron phosphate batteries, disassembling the batteries, taking positive electrode sheets, washing, drying, roasting and separating lithium iron phosphate from aluminum foils; (2) by controlling the addition of acid, carrying out acid leaching on separated lithium iron phosphate, and filtering to separate insoluble iron phosphate and iron oxide to obtain a filtrate; (3) analyzing the filtrate, adjusting the molar ratio of the elements, namely, nLi to (nFe+Mn) to nP to 1: 1: 1 and adding a manganese source and a phosphorus source; and adjusting the pH to obtain a precipitate; drying the precipitate, adding a carbon source and mixing to obtain a pre-sintered material; and (4) carrying out solid sintering treatment on the pre-sintered material under non-oxidizing atmosphere to obtain the lithium iron manganese phosphate serving as the lithium ion battery positive electrode material. The method has the advantages of simplicity in process, environmental friendliness, good product properties and the like.

The invention discloses a method for manufacturing a lead-carbon ultracapacitor battery cathode, comprising the following steps: active substances taking lead powder as a main component and active substances taking active carbon as a main component are respectively coated on different areas of an electrode matrix, and then are dried to obtain the lead-carbon ultracapacitor battery cathode. The invention provides a manufacturing technology of lead-carbon ultracapacitor battery cathode, which takes a pure lead sheet or lead alloy sheet as a matrix, and adopts the active carbon and the lead powder as active substances. Compared with the cathode taking the pure active carbon as cathode active substance, the cathode piece manufactured by the method can greatly improve discharge capacity of thelead-carbon ultracapacitor batteries, the specific energy can reach more than 16wh/kg, the cycle life can reach more than 1500 times, working potential window can reach 2.0V, and the cost is only onethird to one fifth of that of the current inorganic system carbon-carbon symmetric form and nickel electrode-carbon mixed alkaline system.

The invention belongs to the technical field of a cathode material for a lithium primary battery, particularly relates to the field of preparation of the cathode material for a fluorocarbon battery, and in particular to a composite carbon fluoride cathode material for the lithium primary battery, a preparation method and an application thereof. The material is a composite material prepared by ballmilling and mixing a porous carbon fluoride material having a high tap density and a carbon fluoride material having a high graphitization degree and then fluorinating the mixture. The composite material has a carbon content of 38-60%, a fluorine content of 40-62% and a tap density of greater than 0.8g/ml; the mixing mass ratio is in the range of 1:0.1-1:10; and the composite material has high specific surface area, high tap density and high graphitization degree. Due to the high tap density of the material, the overall high volumetric specific energy of the material is guaranteed; through anion diffusion channel composed of porous carbon fluorides, the voltage hysteresis phenomenon at the initial stage of the battery discharge is effectively improved and the overall discharge performance of the material is improved.

The invention provides a preparation method of a nano sheet MnO2-graphene composite material, which comprises the following steps: adding a manganese nitrate solution in a mixed solution of hydrogen peroxide and alkaline to perform redox reaction, washing and drying to obtain powder, dispersing the powder in an ammonium persulphate solution to treat, and then dispersing in an organic solvent to obtain a nano sheet MnO2 solution; and diluting the nano sheet MnO2 solution, mixing with a dispersion liquid of graphene powder to obtain the nano sheet MnO2-graphene composite material after ultrasonic treatment. According to the nano sheet MnO2-graphene composite material prepared by the method, the nano sheet MnO2 and the graphene are alternatively arranged and uniformly distributed to guarantee the high conductivity of the graphene, and high specific energy can be obtained. The composite material is used as a super capacitor of the positive electrode to realize high specific capacitance, good charging/discharging capacity and circulating performance, and good combination property.

The invention relates to a nitrogen-containing binder for sulfur-lithium batteries and a preparation method thereof. The binder is a nitrogen-containing cyclodextrin polymer water-based binder with a three-dimensional network structure. The existing three-dimensional network structure can well bear the mechanical pressure brought by sulfur-lithium batteries in the charging and discharging process due to volume change, introduced nitrogen-containing functional groups can effectively inhibit the problems of dissolution and shuttle effect of polysulfide ions in electrolyte, a number of hydroxyl groups exist in the cyclodextrin and have strong hydrogen-bond interaction with anode material particles, and the stability of pole pieces can be maintained. In addition, the binder also has a role of increasing guide ions. Therefore, the binder can effectively solve the problem that a positive polysulfide material in the sulfur-lithium batteries is unstable in organization structure, the utilization rate of composite material active matter and the rate capability of the active matter can be improved, and accordingly the specific power, specific energy and cyclicity of the batteries can be improved.