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375results about How to "Increase energy density" patented technology

Direct-driving wave power-generating and energy-storing device and control method

The invention relates to a direct-driving wave power-generating and energy-storing device and a control method. The direct-driving wave power-generating and energy-storing device is characterized by comprising a direct-driving wave generator, an AC/DC (Alternating Current or Direct Current) converter, a DC/AC (Direct Current or Alternating Current) converter, a plurality of loads, two DC/DC (Direct Current or Direct Current) converters, a mixed energy storing system and a controller, wherein the mixed energy storing system comprises an ultra-capacitor bank and a storage battery pack; the direct-driving wave generator is used for converting the kinetic energy of waves to a low frequency alternating current and sending to the AC/DC converter; the AC/DC converter is used for converting the low frequency alternating current to a direct current and connect and connected with the input end of the DC/AC converter through a direct current bus; the output end of the DC/AC converter is connected with the loads; the direct current bus is respectively connected with one ends of the two DC/DC converters, the other end of one of the two DC/DC converters is connected with the capacitor bank, and the other end of the other of the two DC/DC converters is connected with the storage battery pack; and the controller is used for controlling the ultra-capacitor bank and the storage battery pack to regulate power flow so as to keep the balance between the output power of the direct-driving wave generator and the power of the loads. The invention can be widely applied to the process of converting the kinetic energy of sea water fluctuation to the electric energy.
Owner:TSINGHUA UNIV

Preparation method of manganese-based compound positive pole material for secondary lithium ion battery

The invention provides a preparation method of a manganese-based compound positive pole material for a secondary lithium ion battery. The general constitution formula of the positive pole material is Li (LixMn2-x-yMy) O4/Az, wherein x is more than or equal to 0 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 2, and z is more than or equal to 0 and less than or equal to 0.5; and M is a doped modified element, and A is an oxide of a coating element or a phthalocyanines large-ring transition metal complex. When the positive pole material is prepared, a lithium source and an M source are added into mixing equipment containing a medium and a dispersing agent to be mixed and dried; then the mixture and a manganese source are added into the mixing equipment containing the medium and the dispersing agent to be mixed and dried; then the new mixture is roasted and then is cooled to a room temperature; and the new mixture and an A source are added into the mixing equipment containing the medium and the dispersing agent to be mixed and dried, are roasted again, are cooled to the room temperature and are mixed and crushed to obtain the manganese-based compound positive pole material. The preparation method disclosed by the invention has the advantages of simple process, low raw material cost and processing cost, simple process route, short period and low energy consumption. The produced manganese-based compound positive pole material has the advantages of high energy density, mass specific capacity, power performance, high-temperature circulating performance and high-temperature storage performance; and the capacity efficiency of the material is high at -40 DEG C.
Owner:济宁市无界科技有限公司

Lithium ion battery and lithium-rich anode sheet

The invention provides a lithium ion battery and a lithium-rich anode sheet. The lithium-rich anode sheet comprises: a current collector; and a diaphragm, which contains an active substance and is formed on the current collector, wherein the diaphragm and the current collector form an initial anode sheet. The current collector in the initial anode sheet is a porous current collector. The initial anode sheet is rich in lithium on one side, and the lithium rich amount matches the lithium supplement capacity needed by the initial anode sheet. The lithium ion battery includes: a cathode sheet; an anode sheet; an isolation membrane disposed between the cathode sheet and the anode sheet; and an electrolyte solution. The anode sheet is a lithium-rich anode sheet. The lithium-rich anode sheet of the lithium ion battery provided by the invention not only overcomes the excess lithium supplement problem in traditional lithium-rich anode sheets, and also can effectively control the lithium supplement amount of the anode so as to realize uniform lithium supplement and enhance the first coulombic efficiency of the lithium ion battery adopting the lithium-rich anode sheet. Thus, the energy density of the lithium ion battery is greatly improved, and the lithium ion battery can be ensured with better electrochemical properties.
Owner:DONGGUAN AMPEREX TECH

Preparation method of lithium-enriched magnesium-based anode material of lithium ion battery

InactiveCN102916172AIncrease energy densityInhibition of phase transitionCell electrodesCobalt oxideManganese oxide
The invention discloses a preparation method of a lithium-enriched magnesium-based anode material of a lithium ion battery. The preparation method comprises the steps of: depositing cobalt manganese oxide by using an electrodeposition method, and dissolving the cobalt manganese oxide and lithium chloride in a mixed way to obtain lithium cobalt manganese oxide powder; dissolving the lithium cobalt manganese oxide powder and the lithium chloride in a mixed way and heating to obtain lithium-enriched lithium cobalt manganese oxide powder; adding the lithium-enriched lithium cobalt manganese oxide powder into an aqueous solution of aluminum chloride, and standing to obtain aluminum-hydroxide-cladded aluminum-enriched lithium cobalt manganese oxide; sintering to obtain an alumina-cladded lithium-enriched lithium cobalt manganese oxide material; and preparing the anode material. According to the invention, by adoption the alumina-cladded lithium cobalt manganese oxide material as an anode active substance, while higher energy density is achieved, phase change of the anode material and the dissolution loss of important metal are inhibited, and the anode material has good cyclic stability, and is high in specific capacity, good cyclic performance and long service life when applied to the lithium ion battery.
Owner:SHANGHAI JINZHONG INFORMATION TECH

Composite negative electrode, preparation method of negative electrode and lithium-sulfur secondary battery with negative electrode

ActiveCN104241598AIncrease energy densitySolve fever and high temperatureCell electrodesFinal product manufactureCopper foilLithium dendrite
The invention discloses a composite negative electrode, a preparation method of the negative electrode and a lithium-sulfur secondary battery with the negative electrode. The composite negative electrode comprises copper foil and a solid lithium ion conductive diaphragm tape, wherein one end of the copper foil is provided with a tab for conducting current, at least one side of the copper foil is closely provided with metal lithium foil or alloy lithium foil which is used as a battery negative electrode, and the solid lithium ion conductive diaphragm tape covers the battery negative electrode, so that the accumulation of lithium ions on a negative electrode lithium alloy surface and the short circuit, caused by lithium dendrites, between a positive electrode and the negative electrode of the battery can be prevented. In the manner, on the premise of maintaining high energy density, the safety performance of the lithium-sulfur battery can be improved. In addition, multi-element compound electrolyte is used for substituting for organic electrolyte, so that the dissolving and diffusion of sulfur in the electrolyte can be effectively prevented, and the cycling life of the battery can be greatly prolonged.
Owner:GENERAL ELECTRONICS BATTERY CO LTD

Method for preparing lithium cobalt oxide cathode material for lithium ion battery

InactiveCN102891312AIncrease energy densityImprove cycle stabilityCell electrodesCobalt compoundsLithium electrodeDioxide titanium
The invention discloses a method for preparing a lithium cobalt oxide cathode material for a lithium ion battery. The preparation method comprises the following steps of: adding magnesium chloride into a cobalt nitrate solution, uniformly mixing the mixture, continuously pumping cobalt nitrate, magnesium chloride and an ammonium bicarbonate solution into pure water serving as a base solution in a parallel flow mode, performing precipitation reaction to obtain spherical cobalt carbonate with a magnesium (Mg)-doped solid solution; preparing spherical cobalt carbonate with an aluminum (Al)-doped solid solution by a similar method; adjusting the alkalinity of base solution, adding titanium dioxide (TiO2) and a surfactant into cobalt nitrate solution; reacting to form spherical cobalt carbonate with a titanium (Ti)-doped solid solution; roasting the spherical cobalt carbonate with the Mg-doped solid solution, the spherical cobalt carbonate with the Al-doped solid solution, the spherical cobalt carbonate with the Ti-doped solid solution and lithium carbonate to obtain the lithium cobalt oxides cathode material for the lithium ion battery. The cathode material prepared for the lithium ion battery has high energy density and high cycling stability; and the lithium ion battery employing the cathode material has high specific capacity, high cycling stability and long service life.
Owner:SHANGHAI JINZHONG INFORMATION TECH

Preparation method for poplar catkin based biomass carbon/sulfur composite material

The invention discloses a preparation method for a poplar catkin based biomass carbon/sulfur composite material. The preparation method comprises the following steps of (1) enabling pre-processed poplar catkin to be immersed in a potassium hydroxide solution to be stirred for 3-12h, and then drying the obtained material in a drying oven; (2) carrying out high-temperature thermal processing on dried alkalized poplar catkin in a tubular furnace at a temperature of 600-900 DEG C for 1-3h, then washing the processed poplar catkin by a diluted hydrochloric acid solution and water alternately until the poplar catkin is neutral; and next, drying the poplar catkin in the drying oven to obtain carbon micron tube powder; and (3) enabling the carbon micron tube powder to be fully mixed with elementary sulfur and then to be subjected to thermal processing in the tubular furnace to finally obtain the poplar catkin based biomass carbon/sulfur composite material. According to the preparation method, only the simple potassium hydroxide activation method and the thermal processing method are adopted, so that simple process and the commercialized operation can be realized; and meanwhile, the poplar catkin based biomass carbon/sulfur composite material is quite high in electrochemical property, and the initial discharge capacity of the composite material can reach 1200 mAh/g under the current density of 0.1C.
Owner:HEBEI UNIV OF TECH +1

Double-source energy system of battery electric vehicle, power supply control method, fast charging method and slow charging method

PendingCN106696721AEnhance load adaptabilityIncrease energy densityCharging stationsConverter typesCapacitanceEnergy management controller
The invention discloses a double-source energy system of a battery electric vehicle. The double-source energy system comprises an energy management controller, a lithium battery management system, a super-capacitor management system, a lithium battery, a super-capacitor bank, a bidirectional DC/DC module, a unidirectional DC/DC module, a motor controller, a motor and the like, wherein the energy management controller is connected with the lithium battery management system, the super-capacitor management system, the bidirectional DC/DC module, the unidirectional DC/DC module and the motor controller, the lithium battery is connected with the lithium battery management system and the bidirectional DC/DC module, the bidirectional DC/DC module is connected with the motor controller and the unidirectional DC/DC module through a direct-current bus, the super-capacitor bank is connected with the super-capacitor management system, the super-capacitor bank is connected with the motor controller and the unidirectional DC/DC module, and the unidirectional DC/DC module is connected with an auxiliary power supply device. The double-source energy system of the battery electric vehicle is enhanced in load adaptability by combining high energy density of the lithium battery with high power density of super-capacitors.
Owner:四川新筑通工汽车有限公司
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