35results about How to "Improve discharge capacity" patented technology

The application relates to the technical field of sodium ion battery positive electrode materials, in particular to a Na2Fe2(SO4)3@Na3Fe2(SO4)3F@CNT positive electrode material.The Na2Fe2(SO4)3 and Na3Fe2(SO4)3F precursors are mixed and sintered, and are coated by CNT, so that the electrochemical performance of the Na2Fe2(SO4)3 is remarkably improved, the conductivity of the material is improved, the material can be used as a sodium ion battery positive electrode material, has a high discharge specific capacity, and has cycle performance and rate performance.

The invention discloses a lithium carbon fluoride battery electrolyte, a preparation method thereof and a lithium carbon fluoride battery, and belongs to the technical field of lithium / carbon fluoride primary batteries. The lithium carbon fluoride battery electrolyte comprises a lithium salt and a monofluoro-substituted short-chain ether solvent. Compared with a non-fluorinated ether solvent, the monofluoroether solvent has good compatibility with a carbon fluoride positive electrode and a metal lithium negative electrode, so that the battery has good discharge performance. Compared with a polyfluoro-substituted ether solvent, the monofluoro substituent group (-CH2F) obviously improves the ionic conductivity of the lithium carbon fluoride battery electrolyte at low temperature, and meanwhile, the monofluoro substituent group (-CH2F) has weak solvation energy at low temperature, so that the discharge platform of the battery at low temperature is obviously improved, and the discharge capacity of the battery is improved.

Provided are a secondary battery and an electronic device, the secondary battery comprising: a housing comprising a shell and a cover plate, one end of the shell forming an opening, the cover plate covering the opening and being connected to the shell, the cover plate being provided with an explosion-proof valve; the electrode assembly is accommodated in the shell, and the electrode assembly comprises a tab facing the cover plate; the current collecting component is in welded connection with the tabs; the flow collecting component is provided with an annular first weak part and a plurality of second weak parts, the projection of the anti-explosion valve in the axial direction of the flow collecting component is located in an area surrounded by the first weak part, the second weak parts are arranged around the center of the flow collecting component, and each second weak part longitudinally extends in the radial direction of the flow collecting component. The annular first weak part surrounds the second weak parts, and the strength of the second weak parts is larger than that of the annular first weak part. According to the technical scheme, at least the central area of the current collecting component can be effectively opened during pressure relief, and the pressure is sprayed out along with the anti-explosion valve, so that the safety performance of the battery is improved.

An object of the present application is to provide a battery active material capable of maintaining good initial coulombic efficiency and cycle characteristics and increasing discharge capacity to, for example, 800 mAh / g or more, a battery composite active material containing the battery active material, and a secondary battery containing these materials in a negative electrode. The battery active material of the present application is an amorphous silicon-based material composed of elements including Si, O, and C, and has a solid solution structure in which Si, O, and C are mixed at the atomic level. The battery active material of the present application is characterized by having a specific surface area of 0.1 m2 / g or more and less than 20 m2 / g, a pore volume of 0.01 cm3 / g or more and less than 0.5 cm3 / g, and a pore diameter of 2 nm or more and less than 20 nm. 29 The ratio (A / B) of the total value A of the integral values of the respective peaks attributed to SiO2C2 and SiO3C to the integral value B of the peak attributed to SiO4 in the range of chemical shifts 20 ppm to -150 ppm of the Si-NMR spectrum is 0.5 or more and 5.0 or less.

In one embodiment of the present invention, the porous carbon particles used in the positive electrode of an air battery for forming a porous carbon film satisfy all of the following a) to g): a) The full width at half maximum (FWHM) of the D band peak in the Raman spectrum is 30 cm. ‑1 Above and 60cm ‑1 Below; b) The full width at half maximum (FWHM) of the G-band peak in the Raman spectrum is 32 cm. ‑1 Above and 80cm ‑1 The following are examples: c) The ratio of the intensity of the D band peak to the intensity of the G band peak in the Raman spectrum, i.e., an R value of 0.8 or higher; d) The surface spacing of the (002) plane of carbon based on X-ray diffraction (XRD) is d 002 e) The portion with a diameter greater than 0.336 nm and less than 0.355 nm; e) The volume of pores with a diameter greater than 1 nm and less than 1000 nm, determined by the BJH method from the adsorption isotherm obtained by nitrogen adsorption, is 1.5 cm³. 3 / g or more and 10.0cm 3 / g or less; f) The volume of pores with a diameter of 1 nm or more and less than 100 nm, determined by the BJH method from the adsorption isotherm obtained by nitrogen adsorption, is 1.0 cm³. 3 / g or more and 8.0cm 3 / g or less; g) The specific surface area obtained by the BET method from the adsorption isotherm obtained by nitrogen adsorption is 500 cm². 2 / g or more and 2000cm 2 / g or less.

The application discloses modified tricobalt tetraoxide and a preparation method and application thereof, and belongs to the technical field of battery materials. The modified tricobalt tetraoxide is doped with rare earth elements and aluminum simultaneously; the total doping amount of the rare earth elements is not more than 0.5% in terms of mass percentage; and the doping amount of the aluminum is not more than 1.2%. The modified tricobalt tetraoxide has a relatively compact structure and high mechanical strength, is not easy to be broken during calcination, and has no surface floating powder phenomenon, so that the electrochemical performance of downstream product lithium cobaltate positive electrode material is improved.

This application provides a battery pack reconfiguration method, electronic device, storage medium, and program product. The method includes: acquiring battery pack-level data for each battery cluster in a target energy storage system, including the capacity retention rate and state of charge of the cells; calculating the capacity retention rate of each battery pack in the target energy storage system based on the "weakest link" principle; exchanging and reconfiguring the batteries in the target energy storage system to obtain the change in capacity retention rate of the target energy storage system after the exchange and reconfiguration; and determining the corresponding battery pack reconfiguration scheme for the target energy storage system based on the change in capacity retention rate. This method aims to fully utilize the energy storage capacity of existing batteries in the energy storage system without adding additional energy storage units, reducing the bottleneck effect, increasing the overall discharge capacity of the system, and improving the profitability of the power station. By exchanging and reconfiguring the batteries in the energy storage system, the difference in capacity retention rate is reduced, and the capacity retention rate of each level of the energy storage system is balanced.

The present disclosure relates to a negative electrode and a method of manufacturing the same. The negative electrode includes a silicon-based negative electrode active material and a carbon-based negative electrode active material to have excellent charge / discharge capacity and energy density, and to have excellent fast charging performance and lifespan characteristics because the carbon-based negative electrode active material included in each negative electrode active layer is oriented to have a predetermined inclination with respect to a negative electrode current collector.

The invention provides a solid-state battery composite pole piece, a preparation method thereof and an all-solid-state battery. The preparation method comprises the steps that a pole piece and an electrolyte membrane are provided, the pole piece comprises a current collector and an active material layer attached to the current collector, the active material layer comprises a first binding agent, the electrolyte membrane comprises an electrolyte membrane, the electrolyte membrane comprises a second binding agent, the first binding agent and the second binding agent are thermal response type binding agents, and the first binding agent and the second binding agent are thermal response type binding agents; the pole piece and the electrolyte membrane are subjected to rolling compounding to form the solid-state battery composite pole piece, the pole piece and the electrolyte membrane are heated through infrared radiation before rolling compounding, so that the surface of the active substance layer and the surface of the electrolyte membrane are softened, and then the binding force between the pole piece and the electrolyte membrane is remarkably improved through rolling compounding; and the two are combined more tightly, so that the discharge capacity of the battery under high rate can be improved, the structural stability of the solid-state battery composite pole piece is improved, the cycle life of the battery is prolonged, and the safety of the battery is improved.

The invention discloses a lithium-rich manganese-based positive electrode material compositely coated with an alpha-ZrP-conducting polymer, a preparation method of the lithium-rich manganese-based positive electrode material and application of a solid-state battery. According to the material, a bulk phase modified lithium-rich manganese-based material is used as a core, and a composite coating layer composed of a delaminated alpha-ZrP nanosheet and a conductive polymer is constructed on the surface of the lithium-rich manganese-based material. The composite coating layer can realize internal proton self-exchange response with the conductive polymer based on the solid acid characteristic of alpha-ZrP, and an overpass type rapid ion-electron dual-transmission channel is formed in the material body. Meanwhile, the coating layer is used as a compact physical and chemical barrier, and harmful side reactions between the positive electrode and the solid electrolyte are effectively blocked. When the prepared positive electrode material is applied to a solid-state battery, high first-circle coulombic efficiency and excellent cycling stability and rate capability are shown, and the two core problems of unstable interface and slow dynamics of a lithium-rich manganese-based material in the solid-state battery are effectively solved.

The application provides a preparation method of a thermal battery positive electrode active material, an antimony sulfide / carbon composite material, a positive electrode sheet and a thermal battery. The thermal battery positive electrode active material comprises antimony sulfide. The application adopts antimony sulfide (Sb2S3) as the positive electrode active material, and the antimony sulfide has excellent thermal stability and better high-voltage platform stability.

The application belongs to the technical field of lead-acid batteries, and particularly relates to a positive active plate of a flooded traction lead-acid battery and a manufacturing method thereof. The positive active plate of the flooded traction lead-acid battery comprises a positive grid with a plate lug, positive lead paste and a polyester heat-shrink bag. The positive grid is provided with horizontal ribs and vertical ribs. The positive lead paste is thickly coated in the positive grid. The polyester heat-shrink bag is wrapped outside the positive grid and the positive lead paste to bind the positive lead paste to the positive grid. The positive active plate of the flooded traction lead-acid battery avoids the falling of the lead paste by means of the over-coating of the lead paste and the wrapping of the polyester heat-shrink bag, improves the service life of the positive active plate, improves the working environment and reduces the investment cost of the production equipment. The application also provides a manufacturing method of the positive active plate of the flooded traction lead-acid battery, which is simple and easy to implement.

The object of the present invention is to provide a thermal power generation battery with excellent battery characteristics. The above problem can be solved by a thermal power generation element that does not require a temperature gradient, wherein a first part comprising a semiconductor which produce thermally excited electron and hole, a second part comprising an electrolyte in which an charge transport ion pair can be moved therein, and a third part comprising a substance that is an electrode, are in contact with each other in this order, and wherein a valance band potential of the semiconductor of the first part is positive with respect to a redox potential of a charge transport ion pair; and an ion which is more susceptible to oxidation among the two ions is oxidized at an interface between the first part and the second part; and an ion which is more susceptible to reduction among the two ions is reduced at an interface between the third part and the second part; and wherein the thermal power generation element satisfies the following formula (I): L / IDT=1−20 wherein L is a "shortest distance between the first part and the third part", and IDT is "ion diffusion thickness."

The application relates to a preparation method of a lithium battery diaphragm and belongs to the technical field of lithium battery preparation. The method is as follows: epoxy resin, a diluent, a curing agent 1 and an oleophilic emulsifier are uniformly mixed to obtain dispersion liquid 1; an electrolyte solution is constantly dropped into the dispersion liquid 1, constant-temperature high-speed stirring is carried out, and a water-in-oil emulsion is obtained; under constant temperature, deionized water, a hydrophilic emulsifier and a curing agent 2 are uniformly mixed to obtain dispersion liquid 2; the water-in-oil emulsion is added into the dispersion liquid 2, high-speed emulsification is carried out, and a water-in-oil-in-water emulsion system is obtained; the water-in-oil-in-water emulsion system is subjected to temperature rising and curing; after curing, centrifugal separation, washing and drying are carried out, and a solid nanometer adhesive is obtained; the solid nanometer adhesive is ground, then is uniformly coated in a mold and is subjected to high-temperature treatment, and the lithium battery diaphragm is obtained. The electrolyte solution is selected as the inner water phase of the water-in-oil emulsion, the internal osmotic pressure of the emulsion can be increased, fusion between the emulsions can be prevented, and the particle size is increased.

This invention provides a lightning protection device for medium-wave transmitters, belonging to the technical field of medium-wave transmitters. It includes a cabinet structure with a vertically mounted grounding mechanism on the bottom surface. A lightning rod is installed at the top of the support, serving as the first line of lightning protection. A complete intelligent grounding system is constructed, with humidity detectors evenly distributed at multiple depths in the soil layer to monitor humidity changes at different depths in real time. When a decrease in soil moisture and an increase in grounding resistance are detected, maintenance personnel can inject water into the water storage box through the water injection pipe. The water seeps evenly into the soil layer through the injection holes, effectively reducing the grounding resistance and ensuring excellent lightning protection grounding performance even in dry seasons or arid regions. Multiple grounding rods are arranged in parallel, increasing the contact area with the soil and further improving the discharge capacity. This design fundamentally solves the technical problems of traditional grounding devices being greatly affected by soil moisture and having unstable grounding effects.

A negative electrode material for a lithium ion secondary battery, the negative electrode material being graphite particles in which the compressive load, which is the magnitude of the pressure required to compress the graphite particles to a density of 1.7 g / cm3, is 3.5 kN / cm2 to 5.0 kN / cm2, and the ratio I002 / I110 of the peak intensity (I002) of the 002 diffracted ray of the graphite crystal to the peak intensity (I110) of the 110 diffracted ray of the graphite crystal, which is obtained by X-ray diffraction measurement of a compressed body pressed at 0.8 t / cm by CuK [alpha] rays, is 300 to 800.

The invention discloses a self-breathing type high-performance zinc air battery and a manufacturing method thereof, and the method comprises the following steps: preparing a La1-ySryMnO3-Mn3O4-porous carbon composite catalyst (y = 0.6-0.9) based on a one-pot method, and forming an extremely thin planar air electrode with the thickness of 0.35-0.55 mm by adopting a spraying method in combination with a cold pressing process; preparing the obtained planar air electrode into a cylindrical structure and then forming a flat-bottom U-shaped air positive electrode, putting a cylindrical diaphragm into the air positive electrode, injecting zinc negative electrode paste into the cylindrical diaphragm, and then inserting a negative electrode current collector with multiple layers of coaxial structures; the prepared air electrode is high in reaction activity and low in polarization potential; the cylindrical No.1 zinc air battery which is large in capacity (37Ah, working current 500mA), high in specific energy density (greater than 400W / kg) and capable of continuously and stably working under large current (2-5A) is developed by the method, and large-scale production of the high-performance LR20 type zinc air battery is facilitated.

The application discloses a preparation method of single-atom modified porous carbon material and application of the single-atom modified porous carbon material in lithium-sulfur batteries. The preparation method comprises the following steps: preparing zinc-based metal organic framework material Zn-MOF nanoparticles; coating phenolic resin (RF) on surfaces of the Zn-MOF nanoparticles to obtain Zn-MOF-RF nanoparticles; adsorbing X metal salt on the Zn-MOF-RF nanoparticles by using a solution immersion method; and obtaining X single-atom loaded hollow nitrogen-doped porous carbon (X-N / HNPC) composite material by high-temperature carbonization under an inert atmosphere. The composite material has a large specific surface area and rich pore size structure, and as a positive electrode material, can not only improve the utilization rate of active material sulfur, but also effectively adsorb polysulfides by high catalytic active sites, improve redox reaction kinetics, and further inhibit the shuttle effect of polysulfides. Based on the lithiumophilicity of metal single atoms, as a lithium negative electrode carrier, the lithium uniform deposition can be regulated, the growth of lithium dendrites can be relieved, and the stability of the battery can be improved.

The invention relates to a battery technology, in particular to an interface layer constructed by an ultralow-concentration electrolyte, a preparation method of the interface layer and a lithium battery. According to the preparation method of the interface layer constructed by the ultralow-concentration electrolyte, in a low-concentration electrolyte system, the ultralow-concentration electrolyte can greatly reduce the viscosity of the electrolyte, the ultralow-concentration electrolyte can generate overpotential in the formation process, and meanwhile very small formation current can be kept in the constant-voltage process; by constructing a uniform solid-liquid interface electrolyte membrane with an inorganic inner layer and an organic outer layer, the DCR of the battery can be remarkably reduced, the discharge capacity of the battery can be improved, and meanwhile, the cost can be further reduced by the low-concentration electrolyte.

The application provides a preparation method of a lithium manganese iron phosphate positive electrode material and the lithium manganese iron phosphate positive electrode material. The preparation method comprises the following steps: mixing a lithium manganese iron phosphate precursor and a COF-5 covalent organic framework material to obtain a first mixture, the COF-5 covalent organic framework material has a porous hole structure and contains carbon elements and active functional groups; and performing first sintering on the first mixture, so that the lithium manganese iron phosphate precursor is converted into a lithium manganese iron phosphate matrix, the COF-5 covalent organic framework material is carbonized to form a porous carbon coating layer, and thus the lithium manganese iron phosphate positive electrode material is obtained. The positive electrode material obtained by the preparation method has a uniform surface coated with a porous carbon layer formed by carbonization of COF-5, the coating layer retains an ordered porous structure, can improve the electronic conductivity and lithium ion diffusion capacity of the material, inhibits manganese dissolution and interface side reactions in high-temperature cycles, and improves particle dispersity and particle size consistency.

The utility model discloses a tower lightning protection grounding device which comprises a connecting block, a grounding rod is fixedly installed on the outer surface of the lower end of the connecting block, a spiral metal conductor is fixedly installed on the outer wall of the grounding rod, a mounting hole is formed in the upper portion of the outer surface of one side of the connecting block, and a grounding down lead penetrates through the mounting hole. A limiting assembly is mounted in the connecting block and comprises a second limiting hole, a third limiting hole, a mounting cavity, a compression spring, a limiting block and a limiting pin. According to the lightning protection grounding device for the tower, the grounding downlead and the connecting block are limited through the limiting assembly, the stability after connection is improved, assembly and disassembly are facilitated, the contact area between the grounding body and soil is increased through the grounding rod, the spiral metal conductor and the spiral structure, and the grounding body is prevented from being damaged. And grounding resistance is reduced.

Disclosed is a positive electrode active material for improving the performance of an electrochemical device. The positive electrode active material comprises an overlithiated layered oxide (OLO), and has an R value (defined by Formula (1) R = (P A / P B ) of not more than 27. According to small-angle X-ray scattering analysis, in Formula (1), P A is the volume (cm 3 / g) of macro pores contained in the positive electrode active material, P B is the volume (cm 3 / g) of micro pores contained in the positive electrode active material, the macro pores have a maximum volume fraction in the pore radius range of 2 to 50 nm, and the micro pores have a maximum volume fraction in the pore radius range of 0.5 to 2 nm.

The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same, and more specifically, to a positive electrode active material for a lithium secondary battery, which is obtained by modifying the surface of a medium nickel (Mid-Ni) type lithium transition metal oxide having a relatively low nickel content, the present invention relates to a positive electrode active material capable of exhibiting improved driving characteristics in a high-voltage operating environment and a lithium secondary battery including the same.

This invention discloses a lithium iron phosphate cathode material, its preparation method, and a lithium-ion battery. The preparation method includes the following steps: preparing a particle size D50 of 1... D1 Large-particle-size lithium iron phosphate cathode material; preparation of particle size D50 is I D2 Small-particle-size lithium iron phosphate cathode material; the two are mixed and carbon-coated to obtain lithium iron phosphate cathode material; wherein, the residual carbon content of the first carbon source is less than that of the second carbon source; the volume fraction of the small-particle-size lithium iron phosphate cathode material is X2, I=I D1 ×(1-X2)∕[8×(X2×I] D2 )], 0 < I < 3. The method of the present invention grades large and small lithium iron phosphate cathode materials with carbon coating, limiting I D1 I D2 The relationship with X2, and carbon coating after gradation, improve the compaction density, electronic conductivity and lithium-ion diffusion rate of the material, thereby improving the electrical performance of lithium iron phosphate cathode material.

The application provides a cyano-containing phosphite salt additive, characterized in that the additive has a structure as shown in formula (I) and / or formula (II). The cyano-containing phosphite salt additive with a specific structure and composition designed by the application is used as a lithium ion battery lithium supplement agent, is used for supplementing active lithium lost in the first cycle of lithium ion battery self-sacrifice charging and discharging, improves the first cycle coulomb efficiency, and after the end of delithiation, the phosphorous acid and -CN functional groups of the cyano-containing phosphite salt additive are dissolved in electrolyte, participate in the formation of an SEI film, inhibit the decomposition of electrolyte, and improve the high-temperature cycle performance of the battery. In addition, the phosphite salt organic lithium supplement agent has high water oxygen stability, and solves the problem of harsh use and storage conditions of traditional positive electrode lithium supplement agents.

This invention discloses a multiphase hydrogen storage alloy and its preparation method, wherein the alloy has the chemical formula La. 0.37 Nd 0.05 Sm 0.30 Mg 0.28 Ni 3.0 Al 0.1 The phase structure of this alloy is A. 7 B 23 A 2 B 7 AB 2 A multiphase structure was obtained by a two-stage vacuum induction melting method to produce a cast alloy. The cast alloy was then placed in a vacuum annealing vessel, which was evacuated to -0.1 MPa before being placed in an ultra-vacuum annealing furnace for zoned annealing heat treatment. This invention, by setting a high vacuum environment and strictly controlling the volatilization of Mg, controls the chemical composition and phase structure of the alloy, resulting in an alloy containing A. 7 B 23 A 2 B 7 AB 2 A multiphase hydrogen storage alloy with a phase structure has high discharge capacity and good cycle life. It can be used in energy storage batteries such as nickel-metal hydride batteries, which is beneficial for the storage and utilization of secondary clean energy such as wind and solar energy.

This invention relates to carbonaceous materials, where the micropore volume is determined to be 0.05 cm³ using a grand canonical ensemble Monte Carlo simulation of the adsorption-desorption isotherms of carbon dioxide. 3 / g or more and 0.20cm 3 For g and below, in the aforementioned adsorption-desorption isotherms, the ratio of desorption to adsorption (desorption / adsorption) at a relative pressure of 0.01 is 1.05 or higher.

The invention relates to the technical field of sodium ion batteries, in particular to a positive electrode material and a preparation method thereof. The preparation method comprises the following steps: a mixing step: putting a raw material X and a raw material Y into a container filled with water, mixing and stirring to obtain slurry A, and then grinding the slurry A to obtain precursor slurry B; wherein the X raw material is a substance which contains an M element and is not easy to dissolve in water, the Y raw material is a sodium salt which is easy to dissolve in water, and at least one of the X raw material and the Y raw material contains a phosphorus element P; a spray drying step: placing the precursor slurry B in spray drying equipment for spray drying treatment to obtain precursor powder C; and a sintering step: putting the precursor powder C into sintering equipment for sintering treatment to obtain the positive electrode material. According to the preparation method, the raw materials are specially designed in the mixing step, and the spray drying step and the sintering step are cooperated, so that the obtained positive electrode material product is high in purity and relatively good in electrochemical performance.

The present invention discloses a lithium battery positive electrode material precursor and its preparation method and application. The positive electrode material precursor has the chemical formula NixCoyMzTp(OH)q, the positive electrode material precursor contains secondary particles in the form of microspheres formed by agglomeration of primary particles, and the microspheres have a three-layer structure from the inside to the outside, namely an inner core layer, a middle layer and an outermost layer. The ratio of the intensity of the (110) and (102) crystal planes diffraction peaks expressed as peak height in the XRD diffraction pattern of the inner core layer of the microsphere is 1.0-8.0. The positive electrode material prepared by using the positive electrode material precursor has high discharge specific capacity and good cycle stability, and can be used in high-performance lithium batteries.

This invention provides a tailings dam drainage well group and flood discharge system, relating to the field of tailings flood discharge technology. The tailings dam drainage well group provided by this invention includes a base and multiple drainage wells. Each drainage well is installed on top of the base, which has a drainage channel. Each drainage channel has a drainage outlet and inlets that correspond one-to-one with the spaces enclosed by the multiple drainage wells. The drainage outlet is connected to each inlet. The tailings dam drainage well group provided by this invention allows multiple drainage wells to share a single drainage outlet, saving the construction cost of subsequent connecting tunnels and facilitating centralized and unified management of the flood discharge system. Furthermore, each drainage well can be designed with different sizes and types to meet different flood discharge capacity requirements.