33results about How to "Reduce charge and discharge polarization" patented technology

The invention relates to an application of a porous carbon material with a grading pore structure in a lithium-air cell anode, and is characterized in that the carbon material has mutually communicated grading pore structure distribution which has a mesoporous structure for depositing the discharge products and a macroporous structure suitable for transmission of oxygen and an electrolyte. When the carbon material is taken as a material of the lithium-air cell anode, the space utilization rate of carbon material can be increased at maximum limitation during a charge and discharge process, specific discharge capacity, voltage platform and multiplying power discharge capability of the cell can be effectively increased, so that the energy density and power density of the lithium-air cell can be increased. The porous carbon material has the advantages that the preparation technology is simple, the material source is wide, the grading pore carbon material pore structure enables regulation and control, the regulation and control modes are various, and the doping of metal/metal oxide can be easily and simultaneously realized.

The invention provides a high-voltage and high-volumetric-energy-density long-life lithium ion battery and a preparation method thereof. The battery comprises a lithium ion battery outer shell aluminum-plastic packaging film, a positive electrode piece, a negative electrode piece, an isolation film, an electrolyte, and positive and negative electrode lugs, wherein the positive electrode piece uses carbon nanotubes (CNTs) as a conductive agent, and the isolation film comprises a polyolefin isolation film base and a mixed coating of Al2O3 and polyvinylidene fluoride (PVDF); the surface of the polyolefin isolation film base is coated with the mixture of Al2O3 and polyvinylidene fluoride (PVDF). The high-voltage and high-volumetric-energy-density long-life lithium ion battery provided by the invention not only has volumetric energy density of greater than or equal to 700Wh / L, but also has good electrochemical performance and safety performance, has outstanding cycle performance, and has a cycle life of 800 times and a capacity retention rate of 80% or above at normal temperature.

The invention relates to a composite catalyst of an air electrode of a lithium-air cell. The composite catalyst comprises a metal catalyst, and a support for performing synergic catalysis with the metal catalyst. The metal catalyst is uniformly distributed on the surface of the support via in-situ loading. The metal catalyst accounts for 0.01 wt%-99.9 wt% of the composite catalyst, preferably 0.1 wt%-60 wt%, and more preferably 0.5 wt%-5 wt%. By utilizing the metal catalyst and the support with synergic effect on the metal catalyst, the composite catalyst of the air electrode is formed, the dispersibility and the stability of the original metal catalyst are improved, and also the catalytic activity not owned or unreached by the single metal catalyst is induced to generate.

The invention relates to a nitrogen-doped porous carbon material used for anode of a lithium-air cell, which has a mutually communicated graded pore structure, N is uniformly doped in a C frame, wherein N accounts for 0.2-15% of carbon material, the graded pore comprises a mass transfer pore and a deposition pore, the pore volume of the deposition pore accounts for 40-95% of total pore volume, and the pore volume of the mass transfer pore accounts for 4-55% of total pore volume. The carbon material as the lithium-air cell material can greatly increase the space utilization rate of the carbon material during a charge and discharge process at maximum limit, so that lithium-air cell energy density and power density can be effectively increased. The nitrogen-doped porous carbon material used for anode of lithium-air cell has the advantages that the preparation technology is simple, the material source is wide, the pore structure of the graded aperture carbon material enables regulation and control, and the regulation and control modes are various, and the nitrogen doping mode is easy to realize.

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode. The nitrogen-doped porous carbon material is characterized in that the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention relates to a carbon-based composite positive electrode material for a lithium-air battery and a preparation method of the carbon-based composite positive electrode material. The carbon-based composite positive electrode material comprises a carbon material, a protection layer and precious metal particles, wherein the protection layer wraps the surface of the carbon material and is composed of an ionic liquid, and the precious metal particles are dispersed in the ionic liquid in a nanoparticle form so as to modify the surface of the carbon material.

The invention discloses a method for reducing the charge and discharge polarization of a lithium air battery with a nonaqueous electrolytic solution. According to the method, the purpose of reducing the charge and discharge polarization of the lithium air battery with the nonaqueous electrolytic solution can be achieved on the basis of neither increasing the battery cost nor reducing the energy density of the battery; the method is simple and easy to realize.

The invention discloses a lithium-air battery cathode bifunctional catalyst and application thereof. The catalyst is a compound with a perovskite crystal structure and particularly is Ba0.9Co0.7Fe0.2Nb0.1O3, La0.6Sr0.4Co0.2Fe0.8O3, Pr0.4Sr0.6Co0.2Fe0.7Nb0.1O3 or Ba0.5Sr0.5Co0.8Fe0.2O3. The lithium-air battery cathode bifunctional catalyst can be used for obviously reducing the charge/discharge polarization of a battery and achieving high charge/discharge capacity, has excellent charge/discharge multiplying power and long cycle life, can be used for obviously reducing the production cost, and has excellent catalytic efficiency. A lithium-air battery containing the catalyst has the advantage of high energy density and is applicable to the fields of various mobile electronic equipment and electric batteries.

The present invention relates to a cathode catalyst for a metal-air battery, a method for manufacturing the same, and a metal-air battery comprising the same. More specifically, the present invention relates to a cathode catalyst for a metal-air battery, a method for manufacturing the same, and a metal-air battery comprising the same having an improved storage capacity for charging/discharging and an increased charge-discharge cycle lifetime. The cathode catalyst is characterized by having a layered perovskite structure, and including lanthanum and nickel oxides. The cathode catalyst including the layered perovskite is used for manufacturing a cathode for a metal-air battery, and a metal-air battery is provided using the same. As a result, the charge-discharge polarisation of the metal-air battery is decreased, the storage capacity is increased, and the charge-discharge cycle lifetime can be improved.

The invention relates to a lithium peroxide electrode and a preparation method and an application thereof. The lithium peroxide electrode comprises a substrate and lithium peroxide deposited in the substrate; the substrate comprises a conductive framework and a porous layer formed on the conductive framework; and the conductive framework is made of a metal material. The preparation method of the lithium peroxide electrode disclosed in the invention has the characteristics of simple process, low cost and less pollution, and the problems of corrosion loss, high polarization and the like of an oxygen electrode carbon carrier and a catalyst in the conventional lithium oxide battery or a lithium air battery can be avoided; and meanwhile, the lithium peroxide electrode is low in cost and large-scale production can be realized easily.

The invention relates to the field of a lithium ion battery and discloses slurry for a negative electrode pole piece and a preparation method thereof, the negative electrode piece and the lithium ionbattery. The slurry includes 46-54% of slurry body and 46-54% of the water by the mass fraction, and the slurry body includes, by the mass fraction, 93.5-95.5% of titanium hydroxide coated graphite, 2-3% of conductive agent, 1-1.5% of thickener and 1.5-2% of binder. The slurry is advantaged in that the power output range of the lithium ion battery assembled with the negative pole piece is greatlyimproved, the wetting effect of the electrolyte on the graphite can be improved, lithium insertion kinetics is improved, charge and discharge polarization phenomena are reduced, moreover, based on semiconductor properties of titanium hydroxide itself, electron conduction is accelerated, a coating material has a nanoparticle size, the tunneling effect is achieved, lithium ion conduction is improved, low temperature power output of a core is optimized, in particular, the rapid discharge capability of the lithium ion battery under the high current is greatly improved.