298 results about "Active particles" patented technology

According to the plasma aquaculture water purification method and system, a cold plasma directional screening technology is used as a core to construct a cold plasma water treatment module, a nanosecond pulse plasma generator is used for exciting a gas medium to form cold plasma, active particles are screened in situ through a directional screening assembly, and the cold plasma water treatment module is used for purifying aquaculture water. The method comprises the following steps: introducing ammonia nitrogen into a water body, guiding < 1 > O2 to be quickly injected into the water body, instantaneously completing a primary purification reaction in a gas-liquid intersection chamber, further, in order to fully utilize residual active particles, directionally converting a reaction precursor O3 of < 1 > O2 into < 1 > O2 through a catalytic dissociation module, and completing a secondary purification reaction between the < 1 > O2 and the ammonia nitrogen. Ammonia nitrogen is directionally converted into nitrogen by utilizing a 1O2-dominated non-free radical reaction path, the content of ammonia nitrogen and total inorganic nitrogen in a water body is reduced, and after purification is completed, oxidizing components in the water body and tail gas are respectively removed by adopting a by-product removal assembly, so that the use safety is guaranteed.

The invention relates to the technical field of intelligent fire extinguishing control of energy storage power stations, in particular to a method and system for plasma protection of thermal runaway of an air-cooled energy storage power station. The method comprises the following steps: processing real-time data acquired by a multi-source sensor through a dynamic risk assessment model to obtain a risk level and an early warning level; an initial control instruction for the plasma generator and the air cooling and refrigerating system is formed according to the risk level and the early warning level; the initial control instruction is processed to form a driving control signal; a control signal is subjected to cooperative execution processing to obtain a high-energy active particle jet flow, a forced airflow and a refrigeration effect. The system comprises an air cooling box body, a battery, a fan, a plasma generator, an ejector, an intelligent controller, a compressor, a gas-liquid separator, a heat exchanger, an electronic expansion valve, a drying filter, a gas sensor and a pressure sensor valve. The safety and reliability of the energy storage power station are improved.

This invention is related to the field of biosensors. In particular, devices and methods are described which enable the quantification of biomolecules by virtue of particle speed driven by induced-charge electrophoresis. For example, a range of biomolecules can be simultaneously detected in a highly sensitive manner from a library (e.g., combination) of active particles having different shapes or fluorescent signatures. Such biomolecules are related to conditions including, but not limited to, cancer biomarkers, viral infection biomarkers, toxins, pesticides, and small molecule drugs.

The invention relates to the technical field of batteries, in particular to an electrode assembly, a preparation method and a lithium ion battery, the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm, the positive pole piece comprises a positive current collector and a positive active material layer, and the positive active material layer comprises a positive active material layer and an inorganic coating; the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material, and the positive electrode active material comprises a ternary positive electrode material of which the core nickel content is more than 80 at% and the shell manganese content is 10-20 at%; the negative active material comprises silicon-based active particles and a three-dimensional elastic conductive network layer coating at least part of the surface of the silicon-based particles, and the positive active material and the negative active material are improved, so that various properties of the electrode assembly are good and stable, the overall electrical property and safety of the battery are improved, and the cycle life of the battery is prolonged.

The invention provides a refrigerator plasma ozone yield regulation and control system and method based on temperature and humidity control. The system comprises a temperature sensor, a humidity sensor, a plasma device and a control unit. The temperature sensor is arranged in the center of the interior of a refrigerator body and used for detecting real-time temperature data in the refrigerator body. The humidity sensor is arranged around a discharge electrode of the plasma device and is used for collecting humidity data of a discharge area in real time; the plasma device is used for generating ozone active particles; the control unit is electrically connected with the temperature sensor, the humidity sensor and the plasma device and used for receiving data of the temperature sensor and the humidity sensor and controlling the working state of the plasma device according to a preset control model. The problem that the ozone yield of plasma carried by the refrigerator is difficult to accurately control is solved.

The invention relates to a multistage self-adaptive plasma excitation and closed-loop feedback processing system, and relates to the field of environmental engineering. After waste gas enters the system, parameters such as odor concentration, temperature and humidity, ozone and the like are detected in real time by a sensor array, and data are fed back to a control center. The method comprises the following steps: decomposing organic high-molecular compounds by pre-ionization, exciting high-density active particles by a main reaction to thoroughly degrade peculiar smell, and decomposing ozone and small-molecular byproducts by using a nano-catalyst in a deep purification stage. The system adopts PID self-adaptive control, parameters can be automatically optimized according to real-time monitoring data, the removal rate is effectively improved, and the energy consumption is reduced. The processed gas is analyzed again through the secondary detection unit, data are uploaded to the cloud model, energy efficiency and processing strategies are continuously optimized through reinforcement learning, and intelligent and closed-loop management is achieved. The device can be widely applied to the field of industrial waste gas treatment, and has the outstanding advantages of efficient removal, low energy consumption, intelligent self-adaption and the like.

The invention provides a catalyst composition, including a mixture of catalytically active particles and a magnetic material, such as superparamagnetic iron oxide nanoparticles, capable of inductive heating in response to an applied alternating electromagnetic field. The catalytically active particles will typically include a base metal, platinum group metal, oxide of base metal or platinum group metal, or combination thereof, and will be adapted for use in various catalytic systems, such as diesel oxidation catalysts, catalyzed soot filters, lean NOx traps, selective catalytic reduction catalysts, ammonia oxidation catalysts, or three-way catalysts. The invention also includes a system and method for heating a catalyst material, which includes a catalyst article that includes the catalyst composition and a conductor for receiving current and generating an alternating electromagnetic field in response thereto, the conductor positioned such that the generated alternating electromagnetic field is applied to at least a portion of the magnetic material.

The invention relates to the technical field of lithium ion battery manufacturing, and discloses a preparation method of a silicon-containing silicon oxide-phenolic resin-artificial graphite composite negative electrode material, which comprises the following steps: grafting phytic acid on the surface of silicon-containing silicon oxide to construct a protonated acidic site, mixing modified silicon-containing silicon oxide, phenolic resin and artificial graphite, and keeping at a constant temperature to obtain the silicon-containing silicon oxide-phenolic resin-artificial graphite composite negative electrode material. Preferentially carrying out pre-polycondensation by utilizing phytic acid catalysis interface resin to form a gel layer, and rapidly removing a solvent to obtain a precursor; according to the preparation method disclosed by the invention, interface chemical anchoring is established before solvent volatilization by utilizing a dynamic competitive mechanism, so that the problem of stripping of resin and active particles caused by solvent volatilization in a traditional process is solved, and the structural stability and the electric conduction continuity of the material in a battery circulation process are improved.

The application discloses a method for regulating solidification structure of aluminum-silicon-iron alloy by gas-phase synergistic double-melt blending. CH4 gas is introduced into high-temperature aluminum-titanium alloy liquid, C-containing active particles are decomposed from the CH4 gas in the alloy melt and gas-liquid reaction occurs between the C-containing active particles and Al and Ti particles to generate intermediate phases such as Al4C3 and Ti3AlC and unstable TiC particles, and the intermediate phases react to generate thermodynamically stable TiC nanoparticles. Meanwhile, aluminum-silicon alloy melt and aluminum-iron alloy melt with significant difference in volume and temperature are blended in a controlled diffusion manner to obtain aluminum-silicon-iron melt. During the gas-liquid blending process, due to the opposite directions of solid / liquid interface advancing direction and solute diffusion direction during melt solidification, there exist non-local micro temperature and concentration fluctuations, and grain refinement is realized by controlling the solidification nucleation and diffusion growth process. The gas-liquid casting technology is a new process with multiple processes in synergistic action, and multiple processes can have a superposition effect under synergistic action, so that the synergistic refinement of aluminum-silicon-iron alloy second phase and aluminum grains is realized.

The application provides a high-flexibility dielectric positive electrode binder and a preparation method thereof and a solid-state battery positive electrode. The high-flexibility dielectric positive electrode binder comprises a fluoropolymer matrix and a fast ion conductor; the fluoropolymer matrix is a copolymer of vinylidene fluoride (VDF) and a fluorine-containing comonomer, the fast ion conductor is in a one-dimensional nanowire shape and is dispersed in the fluoropolymer matrix; and the mass fraction of the fast ion conductor is 1% to 20% based on the fluoropolymer matrix. The application can simultaneously solve three core problems of physical continuity of an ion conduction path in the positive electrode, inhibition of a space charge layer at an interface and mechanical coating of active particles, thereby significantly improving the rate performance, cycle stability and actual energy density of the solid-state battery.

The invention relates to a method for preparing a rapid hydrochromic mesoporous tungsten oxide film based on a plasma etching technology. The preparation method comprises the following steps: mixing an amphoteric block copolymer template agent with a tungsten source precursor, and coating the surface of a substrate with obtained sol to construct an organic-inorganic hybrid film; then introducing oxygen-containing plasma to etch the hybrid film; and finally loading a catalyst layer on the surface of the film. By utilizing the synergistic effect of high-energy active particles and active oxygen species in the plasma, through coupling of physical bombardment and chemical oxidation / volatilization reaction, the rapid removal of the organic template is realized under a low-temperature condition, meanwhile, the structural integrity of a mesoporous skeleton is kept, and the pore collapse and the specific surface area loss caused by traditional high-temperature calcination are avoided. The obtained mesoporous WO3 thin film has a high specific surface area and abundant surface active sites, and hydrogen diffusion and interface reaction kinetics can be effectively improved, so that the coloring / fading response is remarkably accelerated, and the hydrogen-induced discoloration performance is improved.

This invention discloses a portable low-temperature plasma device based on a Laval nozzle structure and its application, belonging to the field of plasma technology application technology. Specifically, it includes (1) the construction of the device; and (2) the use of the device for fungal eradication treatment and transdermal drug delivery enhancement treatment. The beneficial effects achieved by this invention are as follows: This invention is the first to apply the Laval nozzle structure to a portable low-temperature plasma device. The results show that the device can effectively improve the plasma jet performance and active particle content, significantly improve the treatment effect of fungal infections of the skin and nails and the transdermal drug penetration efficiency, while solving the problems of large size, reliance on external power supply, and complex operation of traditional plasma devices. Therefore, using this invention for the treatment of fungal infections of the skin and nails and for enhanced transdermal drug delivery has advantages such as ease of operation, high safety, non-invasiveness, and high efficiency, and thus has potential application prospects in the field of skin disease treatment and transdermal drug delivery.

The invention discloses a multi-dimensional carbon structure negative electrode material, and belongs to the field of lithium battery materials. The multi-dimensional carbon structure negative electrode material comprises a core layer, a middle layer and a shell layer which are sequentially arranged from inside to outside, the core layer comprises a three-dimensional conductive skeleton loaded with active particles; the material of the middle layer comprises amorphous carbon; the material of the shell layer comprises a metal oxide. The negative electrode material with the core-shell structure is obtained by preparing the multi-layer structure containing the core layer, the middle layer and the outer layer and optimizing the material of each layer. The outer layer and the middle layer can effectively inhibit disordered deposition of metal lithium on the outer surface, active particles of the core layer serve as lithium-loving sites to guide lithium to be nucleated and deposited in fiber coils preferentially, the uniformity and directionality of lithium deposition can be improved through cooperation of the three layers, and therefore growth of lithium dendrites is effectively inhibited; and the safety performance and the cycling stability of the prepared battery are enhanced.

The embodiment of the invention provides an active particle track processing method and device, electronic equipment and a storage medium, and belongs to the technical field of image processing. The method comprises the steps that a plurality of active particles are continuously shot, an image sequence is obtained, and the image sequence comprises a plurality of images; according to the image sequence, multiple track fragments of the multiple active particles and the motion time period of the active particles corresponding to each track fragment are obtained, and the track fragments are obtained by the fact that the motion tracks of the active particles are fractured due to the fact that the active particles are shielded by other active particles in the motion process of the active particles; identifying N track fragments belonging to the same active particle from the plurality of track fragments of the plurality of active particles, wherein N is a positive integer greater than 1; and for N track fragments of the same active particle, splicing the N track fragments according to the motion time period corresponding to each track fragment to obtain a first track of the active particle. The embodiment of the invention can improve the track quality of the active particles.

The invention discloses a levetiracetam sustained-release granule and a preparation process thereof, and relates to the technical field of pharmaceutical preparations. The preparation method specifically comprises the following steps: S1, preparing levetiracetam active particles; s2, preparing a transition coating solution and a slow-release coating solution; and S3, coating the levetiracetam active particles with a transition layer and a sustained-release layer in sequence to obtain the levetiracetam sustained-release particles. Wherein the transition coating liquid is prepared by mixing the following raw material components in parts by weight: 3-5 parts of sodium alginate, 1-1.5 parts of a plasticizer and 100 parts of purified water; wherein the molecular weight of the sodium alginate is 50000 to 100000; the slow-release coating solution is prepared by mixing the following raw material components in parts by weight: 5-8 parts of silicon dioxide modified chitosan, 3-5 parts of sodium alginate, 1.5-3 parts of a plasticizer and 200 parts of purified water; wherein the molecular weight of the sodium alginate is 150000 to 200000.

This invention provides an electronic nose. [Solution] An electronic nose is provided, comprising a substrate containing a carbon precursor and a gas-active substance precursor, and an olfactory sensor array including a plurality of olfactory sensors formed by irradiating the substrate with lasers of different parameters, wherein each olfactory sensor includes a laser-induced graphene layer formed from the carbon precursor by laser irradiation of one parameter, and gas-active particles formed from the gas-active substance precursor and embedded in the laser-induced graphene layer, and the plurality of olfactory sensors react to different types of gaseous substances.

The invention discloses a dual-functional-layer gradient composite binder for a negative electrode and a preparation method of the dual-functional-layer gradient composite binder, and relates to the technical field of batteries. The dual-functional-layer gradient composite binder is gradient composite slurry loaded on the surfaces of negative electrode active particles; the gradient composite slurry sequentially comprises inner-layer anchoring slurry and outer-layer buffering slurry from inside to outside; the method specifically comprises the following steps: adding graphene quantum dots and hydroxylated carbon nanotubes into a lithium polyacrylate solution, and performing ultrasonic dispersion to obtain inner-layer anchoring slurry; the preparation method comprises the following steps: adding an ionic conductive elastic polymer into a solvent, stirring and swelling at a high speed to obtain a suspension, and carrying out stepped heating and stirring to obtain outer-layer buffer slurry; taking negative electrode active particles, and stirring and mixing the negative electrode active particles with a conductive agent, the inner-layer anchoring slurry and the outer-layer buffering slurry to obtain negative electrode slurry mixed with the dual-functional-layer gradient composite binder; through the gradient structure design, the two binders with complementary functions are organically combined, so that the interface impedance is reduced, and the cycling stability of the battery is remarkably improved.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a composite sodium supplement additive which comprises the following raw material components: disodium iminodiacetate, conductive porous carbon and a metal oxide quantum dot catalyst, the metal oxide quantum dot catalyst is coated with the disodium iminodiacetate active particles, and the disodium iminodiacetate active particles are adsorbed on the inner wall and the outer wall of the conductive porous carbon to form the composite sodium supplement additive, and the particle size of the composite sodium supplement additive is 1-500 nm. The composite sodium supplement additive takes conductive porous carbon as a load matrix; the conductive porous carbon comprises any one or more of activated carbon, carbon nanotubes, ordered mesoporous carbon and bamboo charcoal. The active ingredients in the composite sodium supplement agent are small in particle size, good in conductivity and low in decomposition voltage, and an excellent sodium supplement effect can be achieved under the condition of low addition.

An energy storage device comprising two electrodes and a separator positioned between and electrically separating the two electrodes wherein at least one of the electrodes comprises an active layer comprising electrode active particles, an electrically conductive element, and an electrolyte. The active layer is characterized by one or more of the following: the volume of the active layer in the presence of the electrolyte is at least 10%, preferably at least 20%, greater than the volume of the combination of the electrode active particles and the conductive element in the absence of the electrolyte; the volume during use is at least 10% greater than the original volume, preferably at least 20%; the conductive element is in the form of a flexible network that can be expanded and / or compressed; the active layer includes a flexible adhesive that facilitates expansion and contraction of the active layer.

The utility model relates to heating platform structure technical field especially relates to a kind of heating platform structure for vacuum cavity.Its technical scheme includes vacuum cavity and with the lower cavity component of vacuum cavity moulding, the lower cavity component includes lower cavity plate and heating plate component, vacuum joint and at least one group of collar joint are fixedly installed on lower cavity plate, oil passage is equipped in the heating plate component, temperature measuring thermocouple component is fixedly installed on lower cavity component, and the temperature measuring thermocouple component real-time monitoring heating plate component's temperature.The utility model improves the temperature of reaction cavity to suitable range, makes the active particle movement speed of oxygen plasma accelerate, and the chemical reaction rate of photoresist is significantly improved, realizes the uniform distribution of cavity temperature, and promotes to ensure the plasma reaction consistency of each area of workpiece surface.

The invention provides a pressure adjusting system of a solid-state battery, energy storage equipment and a vehicle, the pressure adjusting system comprises a box body, an inner cavity of the box body is provided with a pressure adjusting part, and the inner cavity of the box body is divided into an accommodating cavity for accommodating the solid-state battery and a pressurizing cavity for accommodating a pressure medium by the pressure adjusting part; the suspension comprises a pressure regulating loop, and the pressure regulating loop is communicated with the pressurizing cavity; and the pressure regulating loop regulates the pressure applied to the solid-state battery by the pressure regulating part by regulating the pressure medium in the pressurizing cavity. According to the pressure adjusting system of the solid-state battery, the pressure of the solid-state battery is adjusted by using the pressure adjusting loop of the suspension, so that good interface contact and electrical conduction of active particles in the solid-state battery in the circulating process can be ensured, and high-degree performance exertion is realized; harmony parts for vehicle design can be reduced, the design is simplified, and the cost is reduced.

The present application relates to the technical field of plant breeding, and discloses a method for evaluating the fertility of a wolfberry parent based on pollen activity, which comprises establishing a time sequence of wolfberry pollen sampling, obtaining pollen microscopic images at each time point and performing adaptive white balance normalization processing, identifying effective active individuals based on the saturation characteristics of the HSV color space of the corrected images and forming a preliminary activity decay sequence, fitting the preliminary activity decay sequence using a constrained Weber model to extract shape parameters, correcting the contribution weight of sub-active particles using the weight coefficients determined by the shape parameters, generating a final activity decay data sequence, calculating the pollen activity half-life based on the sequence, determining the storage resistance grade by comparing with a preset storage resistance grading standard, and generating an evaluation result. The present application corrects the evaluation weight through kinetic parameter feedback, eliminates the false positive interference of environmental light and staining, realizes the quantitative grading of wolfberry pollen storage resistance, and accurately guides the selection and matching of breeding parents.

The application discloses a treatment device and method for plasma-activated medical cotton products. The device comprises a plasma discharge chamber, a gas pump, a cotton product activation chamber and a control module. The plasma discharge chamber is connected with the cotton product activation chamber through the gas pump, and the cotton product activation chamber is connected with the plasma discharge chamber through a gas return path. The control module is electrically connected with the gas pump to control the operation state and gas flow of the gas pump. The plasma discharge chamber generates plasma active gas which is introduced into the cotton product activation chamber through the gas pump and returned to the plasma discharge chamber through the gas return path, so that the plasma active gas is circulated and the active particle concentration is gradually increased. The medical cotton products to be treated in the cotton product activation chamber are activated to obtain plasma-activated cotton products. The plasma-activated cotton products can replace traditional medical cotton products to directly absorb exudate and blood or be used to dip plasma-activated water or other aqueous solutions for wiping or external application, so that the biomedical effects such as sterilization and hemostasis are realized.

The invention discloses porous ferric fluoride, a preparation method and application of the porous ferric fluoride in a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: stirring Lewis alkali and iron-containing Lewis acid under a heating condition to form a clear solution, adding a carbon source into the clear solution, and stirring to form uniform slurry; adding ammonium bifluoride, continuously stirring, alternately washing the obtained precipitate with ethanol and acetone, centrifuging until the supernatant is colorless and transparent, and drying to obtain a precursor; and finally, uniformly grinding the precursor, performing heat treatment, naturally cooling to room temperature, and fully grinding to obtain the porous ferric fluoride. The preparation process is simple and safe, the cost is low, the use of dangerous chemicals hydrofluoric acid and nitrogen fluoride is avoided, and large-scale synthesis can be realized; the prepared ferric fluoride has a porous morphology, is beneficial to electrolyte infiltration, ensures that the electrical contact between active particles is not influenced while the active material is in full contact with the electrolyte, and improves the electrochemical performance.

An electrode useful in energy storage devices comprises a current collector and an active layer on the current collector, wherein the active layer comprises electrode active particles, electrically conducting material and a binder wherein the binder comprises a copolymer that comprises a first repeat unit and a second repeat unit; where the first repeat unit is derived from the polymerization of a first monomer which is ethylenically unsaturated monomer having a hydrophilic pendant group and the second repeat unit is derived from the polymerization of a second monomer having ethylenic unsaturation.

The invention relates to the technical field of textile functional finishing, in particular to functional finishing liquid as well as a preparation method and application thereof. The functional finishing liquid comprises the following components in percentage by weight: 3-8% of volcanic sand; 5 wt% to 15 wt% of active particles; 5 wt% to 10 wt% of blocked isocyanate acrylate; 2 wt%-4 wt% of a cross-linking agent; 5 wt% to 10 wt% of a surfactant; 8 wt%-15 wt% of a dispersant; 3 wt%-7 wt% of an adhesive; and the balance of water. According to the functional finishing liquid provided by the invention, all the components can be well matched, the obtained functional finishing liquid has multiple functions of intelligent temperature regulation, antibacterial property and antistatic property, and the intelligent temperature regulation fabric prepared by adopting the functional finishing liquid has excellent antistatic property, antibacterial property, moisture absorption quick-dry property and intelligent temperature regulation property.

Thermal management systems and methods of operation include a phase-change element including a phase-change material configured to change in phase state as the phase-change material absorbs heat and a plurality of active particles arranged within the phase-change material, with the plurality of active particles configured to induce a motion of the phase-change material when subjected to an applied electromagnetic field.

The present application relates to inorganic cementing material, solid waste resource utilization and soil solidifying material technical field, specifically relates to a kind of preparation method of micro-nano solid waste base soil solidifying agent.It aims at solving the technical problems of single function and insufficient durability in prior art.The present application grinds granulated blast furnace slag and calcium silicate hydrate seed together, to obtain modified slag micro powder;Steel slag and fly ash are ultrafine ground to obtain steel slag-fly ash composite micro powder;Preparation mesoporous nano slag-biochar composite core, after impregnation load sodium metasilicate and nano zero-valent iron, in turn deposit calcium alginate-cystosine intermediate shell layer and silane coupling agent modified nano silicon dioxide and nano waste concrete recycled micro powder composite outer shell layer, to obtain multi-layer coated active particle;Silicon dioxide, sodium sulfate and nano calcium hydroxide are ball milled into composite activator;The above components are compounded with dispersion stabilizer under inert gas protection.

The dielectric barrier discharge device is arranged on an exhaust pipe of the motor vehicle, a vehicle-mounted storage battery is used as a power source, each dielectric barrier discharge device comprises a cylindrical inner dielectric pipe, a first clamping sleeve seat is arranged on the edge of the inner circle of a dielectric pipe fixing device and used for being connected with an outer dielectric sleeve, and a second clamping sleeve seat is arranged on the edge of the inner circle of the dielectric pipe fixing device. The outer portions of the medium pipe fixing devices at the two ends are fixedly connected with an air inlet insulating plate and an air outlet insulating plate respectively, and the air inlet insulating plate and the air outlet insulating plate are the same in structure, are provided with air holes and are the same in position, so that tail gas entering from the air holes enters the corresponding inner medium pipes. According to the DBD device for treating the tail gas of the motor vehicle, the NOX decomposition efficiency and the active particle concentration are improved, the discharge threshold value is reduced, meanwhile, the discharge intensity is ensured, the overall energy consumption is reduced, the whole device is of a modular structure, later maintenance and material replacement are facilitated, and the DBD device for treating the tail gas of the motor vehicle is formed.

The application relates to a positive electrode active material, a positive electrode sheet and an electrochemical device. The positive electrode active material comprises first particles, second particles and third particles with different particle sizes and specific surface areas, at least one of the first particles, the second particles and the third particles is coated on the surface and doped in the interior with preset particles; wherein the first particles have the largest particle size and the smallest specific surface area, the volume particle size is 15 mu m to 21 mu m, the specific surface area is 0.05 m 2 / g to 0.2 m 2 / g; the second particles have a particle size and a specific surface area in the middle, the volume particle size is 3 mu m to 7 mu m, the specific surface area is 0.2 m 2 / g to 1 m 2 / g; the third particles have the smallest particle size and the largest specific surface area, the volume particle size is 0.5 mu m to 3 mu m, and the specific surface area is 1 m 2 / g to 3 m 2 / g. The scheme provided by the application can meet the high energy density of the battery by matching the positive electrode active particle material with three particle sizes, different specific surface areas, and surface coating or internal doping of preset particles, while the rate performance and high and low temperature performance of the battery are considered.