1427results about How to "Improve charge and discharge performance" patented technology

The invention provides a silicon-carbon composite cathode material for preparing a lithium-ion battery at the room temperature and a preparation method thereof. The composite cathode material is a material with a nuclear shell structure and comprises the following proportional elements: 0.01-10% of simple substance silicon and 90-99.9% of carbon. With regard to the preparation method, silicon powder and graphite are mixed for ball grinding and then added with bitumen or polymer cladding material for ball grinding again, after the treatment of carbonization, the mixture is crushed and sieved to obtain the material containing 0.01-10wt% of silicon and 10-99.9% of carbon. The capacity of the material is more than 350mAh/g, the cycle efficiency of the material is larger than 90% for the first time, and keeps larger than 80% after 200 cycles, and the material has good charging and discharging property.

The invention relates to a high-performance lithium ion battery. According to the battery, an electrode material is subjected to a nano-composite treatment of grapheme and polyaniline; an anode current collector comprises aluminium foil; a cathode current collector comprises copper foil; a conductive agent comprises superconducting carbon black, conductive graphite or acetylene black; a binding agent comprises styrene butadiene rubber, carboxymethylcellulose sodium, polytetrafluoroethylene, polyvinylidene difluoride or hydroxy propyl methylcellulose; a electrolyte comprises liquid electrolyte or a polymer electrolyte containing a conductive polymer, a nano-material, or a mixture comprising the conductive polymer and the nano-material; a membrane is subjected to a high temperature resistant insulation coating treatment, or directly adopts a high temperature resistant insulating porous polymer matrix. A preparation process for the high-performance lithium ion battery comprises: material preparing, coating, drying, rolling, slicing, coil winding or sheet stacking, assembling, liquid injecting, formation and capacity distributing. The lithium ion battery provided by the present invention has characteristics of excellent charge and discharge performance at the large rate, small capacity fading, good heat stability, good safety performance and long electrode cycle life, and can be widely applicable for the fields of electric bicycles, electric motorcycles, electric cars and the like.

A silicon composite comprises silicon particles whose surface is at least partially coated with a silicon carbide layer. It is prepared by subjecting a silicon powder to thermal CVD with an organic hydrocarbon gas and/or vapor at 900-1,400° C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.

The invention relates to a preparation method of a power and energy storage lithium-ion battery. A negative active substance of the power and energy storage lithium-ion battery comprises soft carbon, hard carbon, a mixed material of soft carbon and graphite and a mixed material of hard carbon and graphite. The designing method of the battery comprises the steps of designing the gram volume of the negative active substance as the primary lithium-embedding gram volume, designing the gram volume of the positive active substance as the primary lithium-removal gram volume, designing the ratio of the capacity of the positive electrode and the capacity of the negative electrode to be (1: 1) to (1.5: 1). By adopting the designing method, the capacity and comprehensive performance of the battery can be remarkably improved, and excellent lithium-embedding and lithium-removal capacity of the soft carbon material and the hard carbon material can be adequately exerted. Compared with the existing lithium battery technology, the prepared power lithium battery has long service life, high multiplying power, high safety performance and excellent low-temperature performance and can be widely applied to the fields such as electric tools, various portable devices, spaceflight, starting power supply and the like.

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit 1, a switching control module 100, a damping component R1, an energy storage circuit, and an energy superposition unit; the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit 1, the current storage component L1, and the charge storage component C1 are connected in series; the switching control module 100 is connected with the switch unit 1, and is configured to control ON/OFF of the switch unit 1, so as to control the energy flowing between the battery and the energy storage circuit.

The invention relates to a low-temperature rapid self-heating method for a lithium-ion battery. The method comprises the following steps: (S1) determining a polarization voltage amplitude range which does not have influence on the service lifetime of the lithium-ion battery and is safely used, and selecting a sine AC voltage amplitude according to the range; (S2) calculating the relationship between heat production power and frequency and obtaining a frequency point, namely the optimal heat production frequency point, with the maximum heat production power according to the relationship between battery impedance and frequency under the selected sine AC voltage amplitude; and (S3) carrying out heating free of lifetime loss on the battery by a sine AC signal according to the amplitude determined in the step (S1) and the frequency determined in the step (S2). The low-temperature rapid self-heating method for the lithium-ion battery has the effects of being high in heating rate, obvious in low-temperature performance improvement, free of an influence on the service lifetime of the lithium-ion battery, good in heating temperature uniformity and the like; and the target of reducing the influence on the service lifetime of the lithium-ion battery to the maximal extent is achieved.

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit (1), a switching control module (100), a damping component R1, an energy storage circuit, and an energy superposition unit, the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit (1), the current storage component L1, and the charge storage component C1 are connected in series; the switching control module (100) is connected with the switch unit (1), and is configured to control ON/OFF of the switch unit (1), so as to control the energy flowing between the battery and the energy storage circuit; the energy superposition unit is connected with the energy storage circuit, and is configured to superpose the energy in the energy storage circuit with the energy in the battery when the switch unit (1) switches on and then switches off; the switching control module (100) is also configured to control the switch unit (1) to switch off after the first positive half cycle of current flow through the switch unit (1) after the switch unit (1) switches on, and the voltage applied to the switch unit (1) at the time the switch unit (1) switches off is lower than the voltage rating of the switch unit (1).

An activated carbon having the highest peak D within the range of 1.0 nm to 1.5 nm, in which the peak D is from 0.012 to 0.050 cm³/g and is from 2% to 32% to a total pore volume, in pore size distribution as calculated by BJH method from N₂-adsorption isotherm at 77.4 K. An electric double layer capacitor comprising the polarizable electrode which comprises the activated carbon, carbon fiber, carbon black, and binder.

The invention discloses mixed cathode diachylon of a superbattery and a preparation method thereof. The diachylon is prepared by mixing the following raw materials in parts by weight: 100 parts of lead powder, 4-10 parts of sulfuric acid, 0.1-8 parts of organic binder, 0.1-2 parts of barium sulfate, 0.01-2 parts of hydrogen separating inhibitor, 1-7 parts of active carbon, 0.1-3 parts of heterodromous graphite, 0.05-1 part of acetylene black, 1-4 parts of humic acid, 5-15 parts of red lead, 12-21 parts of water and 0.1-0.2 part of short fiber. By adding the hydrogen separating inhibitor, the active carbon maintains high-performance capacitance characteristics, so that an electrode has high capacitance. In a part of charge state, the recycling service life of the superbattery is improved by more than 10 times compared with a common lead-acid storage battery.

The invention relates to a method for preparing the lithium anode material which is characterized in that: mixing the bivalence iron compound, doping metallic compound, phosphor compound and oxidant, to be reacted in the mixing reactor with temperature of 20-100Deg. C and the pH =1-8 for 0.5-24 hours; drying in 30-160Deg. C; mixing attained leading element, the lithium compound and the deoxidize carbon; heating in non-oxygenation condition to 400-800Deg. C in the temperature increase speed of 1-40Deg. C/min to be calcined in constant temperature for 2-35 hours; decreasing the temperature in the speed of 1-20Deg. C/min to attain the final product. The invention uses the carbon heating to deoxidize the trivalent iron which can solve the oxygenation problem of ferrous iron ion; and uses the mixed ferric phosphate and doping phosphate as leading elements to solve the uniform mixing problem of doping elements and improve the conductivity of material to improve the big current (o.8C) discharge/charge property, with short preparation time, easy control, lower energy consumption and lower cost.

The invention provides a high-reliability vanadium ion electrolyte, which is composed of vanadium sulphate, sulfuric acid, water and an additive, wherein the additive comprises at leas one material selected from the group consisting of an alkali metal salt, a hydroxyl-containing material and a surfactant. The high-reliability vanadium ion electrolyte provided by the invention, the deposition of V (V) and the oxidization of V (II) are effectively controlled by adding a novel additive composition into vanadium ion electrolyte and using the synergistic effects among the components of the additive, the stability of the electrolyte is greatly improved, and the charge and discharge properties and circulation stability of a vanadium battery effectively are improved by applying the vanadium ion electrolyte obtained to the vanadium battery.

The invention relates to a composite diaphragm. The composite diaphragm comprises a non-woven fabric-organic polymer composite base material, and a composite gel compounded with the non-woven fabric-organic polymer composite base material, wherein the non-woven fabric-organic polymer composite base material comprises a non-woven fabric and a cross-linked polymer, and the cross-linked polymer is formed by copolymerization of a polymer monomer containing alkenyl and alkoxy silane containing alkenyl in the presence of a catalyst and a cross-linking agent; the composite gel comprises a gel polymer and inorganic modified nano powder, and the inorganic modified nano-powder comprises a polymer formed by copolymerization of methyl methacrylate and a silane coupling agent containing C=C groups, and further comprises a nano-sol connected with the alkoxy silane by virtue of condensation reaction. The invention also relates to a preparation method of the composite diaphragm and a lithium ion battery.

The invention provides a preparation method of a lithium iron phosphate/carbon nanotube composite material. The preparation method comprises the steps of: dissolving a lithium source and a phosphate source in a mixed liquor agent prepared from alcohol and water to prepare a reaction solution, then adding a ferrous source and a reducing agent, then adding a surfactant, finally adding carbon nanotubes, reacting for 6-8h in a polytetrafluoroethylene high-pressure reaction kettle at 160-200 DEG C to obtain a precursor, calcining the obtained precursor at 600-800 DEG C under the protection of inert gas to prepare the lithium iron phosphate/carbon nanotube composite material with favorable performance. The lithium iron phosphate prepared according to the invention has the advantages of high purity, small grain size, regular shapes and the like, and the carbon nanotubes are embedded into the interiors or cladded onto the surfaces of lithium iron phosphate particles to play a role of electric conductive network, so that the composite material achieves an excellent electrochemical property and is an ideal cathode material for preparing the lithium ion battery.

The invention discloses an unsymmetrical lithium iron phosphate battery, the negative pole of which takes lithium titanate as the main active substance, belonging to the technical field of non water electrolysis liquid lithium ion battery or hybrid battery. The battery comprises an anode, a cathode, a diaphragm and electrolyte; wherein the main active substance of the anode is lithium iron phosphate powder, lithium iron titanate powder added with activated carbon or lithium iron phosphate powder added with carbon nanotube, the anode material also comprises caking agent, conductive agent and dispersing agent; the main active substance of the cathode is lithium titanate powder, compound copper, argentum, or lithium titanate powder or semi-conductive modified lithium titanate power, the cathode material also comprises the caking agent, the conductive agent and the dispersing agent. The caking agent is polyvinylidene fluoride, the conductive agent is acetylene black, and the dispersing agent is N-methyl pyrrolidone. The invention has good discharging property under heavy current, and can maintain high specific power and high specific energy.

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit (1), a switching control module (100), a damping component R1, an energy storage circuit, a freewheeling circuit (20), and an energy superposition unit, the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit (1), the current storage component L1, and the charge storage component C1 are connected in series; the switching control module (100) is connected with the switch unit (1), and is configured to control ON/OFF of the switch unit (1), so as to control the energy flowing between the battery and the energy storage circuit; the energy superposition unit is connected with the energy storage circuit, and is configured to superpose the energy in the energy storage circuit with the energy in the battery when the switch unit (1) switches on and then switches off; the freewheeling circuit (20) is configured to form a serial loop with the battery and the current storage component L1 to sustain current flow in the battery after the switch unit (1) switches on and then switches off.

The invention discloses a hybrid energy storage control system for stabilizing wind power fluctuation and a control method. The system comprises a power smooth acquisition unit and a hybrid energy storage coordination control unit. Wind power set power can be acquired by the power smooth acquisition unit in real time, the wind power set power is contrasted with a desired output power value of a wind power set, after amplitude limit processing, the wind power set power is sent to the hybrid energy storage coordination control unit, Karman adaptive low pass filtering is carried out by the hybrid energy storage coordination control unit according to a power deviation value to acquire a power output value of a wind power set, a first fuzzy controller is for adjusting time constant of a Karman low pass filter, correction on a power output value of the hybrid energy storage system is carried out by a second fuzzy controller after output power of the Karman low pass filter and energy storage cell state-of-charge SOC are acquired by the second fuzzy controller, after the amplitude limit stage, optimum power output is acquired by an energy storage cell and a super capacitor, so over-discharging and over-charging of the cell are avoided, and thereby safety operation of the energy storage system and the optimum wind power fluctuation stabilizing effect are realized.

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a lithium ion secondary battery. The lithium ion secondary battery comprises a cathode, an anode, an isolation membrane and electrolyte, wherein the cathode comprises cathode active substance, adhesive and conductive carbon; the anode comprises a lithium titanate active material, adhesive and conductive carbon; base materials for a cathode plate and an anode plate are aluminum foils; and the ratio of the anode capacity to the cathode capacity is 0.70 to 1.00. The lithium ion secondary battery comprises the following activation steps of: 1, charging the battery with constant current of 0.2C to 5C to change lithium titanate into Li4+xTi5O12 from Li4Ti5O12, wherein the x is more than 0.09 and less than or equal to 2.50; 2, charging the battery changed in the first step with constant current of 0.1C to 5C so that the x in the Li4+xTi5O12 is more than 2.50 and less than or equal to 3.00; and 3, charging the battery changed in the second step with constant voltage for 0.2 to 12 hours, and pumping the gas generated in each step until vacuum. The lithium ion secondary battery has excellent electrochemical performance, and meanwhile, the circulation performance and the high-temperature storage performance of the lithium ion secondary battery are improved.

The invention relates to a lithium ion battery and the manufacturing method thereof, particularly relating to a high multiplying power gel polymer lithium ion power battery and the manufacturing method thereof. Mainly aiming at resolving the technical problems of safety performance, etc., which exists in the prior art, the invention provides the high multiplying power gel polymer lithium ion power battery, which has the advantages of reasonable design, simple structure, high safety performance and low cost, and the manufacturing method thereof. The main technical proposal of the invention is that the lithium ion power battery consists of a cathode mass flow liquid, an anode mass flow liquid, a cathode membrane, an anode membrane, a membrane and electrolyte, wherein, the membrane is the gel polymer electrolyte, the cathode membrane and the anode membrane are evenly coated or hot-pressed on the cathode mass flow liquid and the anode mass flow liquid; the cathode mass flow liquid, the cathode membrane, the membrane, the anode membrane and the anode mass flow liquid are orderly overlaid, forming a square single bag.

The invention relates to a lead plaster for a low temperature resistant lead storage battery for an electric scooter and a preparation method of the lead plaster. The lead plaster comprises an anode lead plaster and a cathode lead plaster, wherein the anode lead plaster comprises the following components in parts by weight: 950-970 parts of lead powder, 80-86 parts of 1.3-1.4g/cm<3> sulfuric acid, 110-125 parts of pure water, 3.0-4.0 parts of colloidal graphite, 30-50 parts of red lead, 1.0-1.5 parts of tin sulfate, 0.5-1.0 part of sodium sulfate and 0.7-0.9 part of short fiber; the cathode lead plaster comprises the following components in parts by weight: 1000 parts of lead powder, 75-81 parts of 1.3-1.4g/cm<3> sulfuric acid, 105-120 parts of pure water, 0.6-0.8 part of short fiber, 6.0-7.0 parts of barium sulfate, 1.0-1.5 parts of Norway lignin, 4.0-5.0 parts of humic acid, 3.0-5.0 parts of acetylene black and 1.0-1.5 parts of semi-carbonized saw dust. According to the lead plaster and the preparation method thereof, the acceptance performance when the battery is charged at low temperature is improved and the discharge capacity is increased; the lead plaster disclosed by the invention is applicable to low-temperature environment and is especially suitable for northeast and northwest regions in China.

The invention discloses a lithium ion battery capable of being subjected to high-rate charge and discharge and a preparation method thereof. The lithium ion battery capable of being subjected to high-rate charge and discharge comprises a positive pole, a negative pole and a diaphragm, wherein the positive pole comprises the following components in percentage by weight: 80-98% of positive active material, 1-19% of conductive agent and 1-19% of binder; the negative pole comprises the following components in percentage by weight: 80-98% of negative active material, 1-19% of conductive agent and 1-19% of binder; the positive active material includes one or two of Li(NiCoMn)O2 and lithium manganate; the negative active material includes one or two of hard carbon and soft carbon; the conductive agent is one of superconducting carbon black, carbon fiber, crystalline flake graphite and a carbon nanotube; and the binder is one of kynar, butadiene styrene rubber, sodium carboxymethylcellulose and hydroxypropyl/carboxymethyl cellulose. According to the lithium ion battery capable of being subjected to high-rate charge and discharge and the preparation method thereof disclosed by the invention, the lithium ion battery has high-rate charge and discharge characteristics, and is good in charge and discharge characteristics, wide in temperature application range, excellent in low-temperature charge performance, long in cycle life and high in safety.

The invention discloses a method for preparing vanadium nitride. In the preparation method, a vanadium-containing compound is mixed with organic nitride, and the mixture is calcinated in nitrogen-containing gas to obtain the vanadium nitride. The vanadium nitride prepared by the method has small grain diameter, and has higher specific capacitance and good cycle performance. The method for preparing the vanadium nitride has the advantages of wide source of raw materials, low production cost, simple operation and low requirement on equipment, meets the requirement of modern industry on energy conservation and emission reduction, and is favorable for industrial production. When the method is used for preparing super capacitors, the super capacitors have high specific capacitance and good cycle performance.

The invention relates to a nickel cobalt oxide/carbon nanotube composite catalyst, a preparation and an application thereof. The bi-functional catalyst comprises carbon nanotube and nickel cobalt oxide NiCo2O4 spinel; according to the preparation, nickel acetate, cobalt nitrate and carbon nanotube are respectively weighed, and then dissolved in ammoniacal liquor and the obtained material is performed with ultrasonic dispersion, then is subjected to a hydrothermal reaction at temperature of 140-160 DEG C for 3-6 hours, the obtained product is cooled to room temperature, cleaned and dried, calcined and ground to obtain the bi-functional catalyst. The invention also provides an application of the bifunctional catalyst in preparation of an air electrode of a metal air battery. The bi-functional catalyst has efficient oxygen reduction performance and efficient oxygen evolution performance in air.

The invention discloses a carbon anode material for a lithium ion battery and a preparation method for the carbon anode material. The carbon anode material comprises core-shell structured composite particles. Each core-shell structured composite particle comprises a substrate, a substrate coating layer and a carbon nano tube embedded into the substrate and the substrate coating layer. Each substrate is natural graphite. Each substrate coating layer is an organic pyrolytic carbon coating layer. The preparation method comprises the following steps of: mixing organic pyrolytic carbon coating layer raw materials and a solvent, heating and melting a mixture, and adding the carbon nano tubes to form a uniform disperse system; adding the natural graphite for mixing, and performing oil bath stirring, evaporative drying, crushing and granulation treatment; and sequentially performing small molecule removal, organic pyroytic carbon cracking and free radical-based treatment, thermal polymerization, high-temperature carbonization and micro-crystallization treatment in a non-oxidizing atmosphere. The anode material is high in first charging and discharging efficiency, cycling stability, heavy-current charging and discharging performance and low-temperature performance. Moreover, a preparation process for the anode material is simple, free of pollutant emissions and environment-friendly, totally-enclosed reaction is adopted, the solvent is recycled, and the anode material can be produced in a large scale.