160 results about "Ion migration" patented technology

The application provides an Al2O3 skeleton electrode sheet containing LiAlO2 / LiNbO3 double-coated layers and a sulfide solid-state lithium battery composite electrode, and belongs to the technical field of sulfide solid-state lithium batteries. + The application adopts an atomic layer deposition process to construct double-layer functional coating on the Al2O3 skeleton, wherein the inner layer LiAlO2 serves as a chemical barrier layer and can inhibit the reaction of sulfides and Al2O3, and the outer layer LiNbO3 serves as an ion conductor layer and can reduce the Li diffusion energy barrier. The application solves the problems of chemical side reactions and too high lithium ion migration energy barrier of the electrode / skeleton material and electrolyte interface by decoupling the barrier-conduction function of the LiAlO2 and LiNbO3 double-coated layers, taking the thermodynamic stable phase (LiAlO2) as an interface sacrificial layer, and utilizing the topological ion transport characteristics of the niobium-oxygen octahedral channel, so that the unity of interface chemical stability and ion conductivity is realized in sub-nanometer scale.

This invention relates to the field of neutron source technology, and particularly to a controllable isotope neutron source device based on ion migration and a method for generating neutrons. The device includes a casing, inside which are a target material module, a target ion migration system, a safety module, and an alpha particle source term. The target material module provides target nuclide ions. The alpha particle source term includes alpha radioactive nuclide material and target nuclide intercalation material. The safety module is composed of target nuclide intercalation material. The target ion migration system is connected to an external control field. Target nuclide ions migrate through the target ion migration system within the safety module and the alpha particle source term. This invention enables active controllability of the isotope neutron source, significantly improving safety. By ensuring sufficient contact between alpha particles and target nuclides to form a molecular intercalation structure, the (α,n) reaction efficiency is greatly improved. Furthermore, this neutron source can be used in combination with multiple modules according to application requirements, effectively increasing the neutron output flux.

This invention relates to the field of semiconductor technology, providing a Si VDMOS device and electronic device. The Si VDMOS device includes a Si VDMOS chip, which comprises a drain electrode, a substrate, and an epitaxial layer connected sequentially from bottom to top. The epitaxial layer contains P-type and N-type doped regions. An insulating dielectric layer and several source electrodes are disposed on the side of the epitaxial layer facing away from the substrate. Several gate electrodes are disposed on the side of the insulating dielectric layer facing away from the epitaxial layer. The source electrodes and gate electrodes form an active region. A metal ring is connected to the insulating dielectric layer, surrounding the active region. The distance between the metal ring and the active region is greater than or equal to 150 μm. The metal ring is connected to a potential structure, the potential of which is equal to the potential of the drain electrode. By employing this structure, silver ion migration can be suppressed at its source.

The application discloses a container explosive non-opening box intelligent checking device based on ion mobility spectrometry, which comprises a connecting outer frame, a hydraulic cylinder is internally installed in the connecting outer frame, a hydraulic pump is connected to one end of the hydraulic cylinder, and a first piston is movably connected in the hydraulic cylinder. The ion mobility spectrometer and a separately designed collecting device are integrated into one equipment, a user carries the equipment by means of shoulder carrying, and a handle is equipped to facilitate holding. The air suction pipe is placed at the ventilation position of the container, the threaded rod and the first piston are driven to move transversely by hydraulic oil, the sample is pushed to the ion mobility spectrometer for analysis and detection, before the next sample test, the threaded rod is driven by the hydraulic oil to drive the polishing blade to rotate in the air suction pipe, the internal powder is scraped, the transverse thrust generated by the piston ring can extrude the gas in the air suction pipe, and thus the whole cleaning process is completed, the residues after each detection are greatly reduced, and the accuracy of the next extraction detection is avoided.

This invention relates to a perovskite solar cell doped with a disulfonic acid-based functionalized ionic liquid and its preparation method. By doping a perovskite precursor solution with a disulfonic acid-based functionalized ionic liquid, this invention effectively controls the crystallization process of perovskite, reduces lead iodide residue, and prepares a perovskite film with better crystallinity, larger and more uniform grain size, and a smoother surface, thereby improving the stability of the perovskite film. Furthermore, the presence of disulfonic acid groups in the ionic liquid anchors uncoordinated Pb ions, inhibits ion migration, and passivates defect states in the perovskite material, significantly improving the quality of the perovskite film and thus enhancing the photoelectric conversion efficiency and long-term stability of the solar cell. Simultaneously, after perovskite film formation, the ionic liquid is mainly distributed at the upper and lower interfaces, achieving synergistic passivation of the two interfaces of the perovskite film, further improving the photoelectric conversion efficiency and long-term stability of the solar cell.

This invention discloses a method for preparing a zinc-based solid electrolyte membrane based on a polycarbonate-based ionic liquid. In the presence of a catalyst, carbon dioxide and epichlorohydrin are alternately copolymerized at 25-70°C and 2.0-4.0 MPa carbon dioxide to obtain a polycarbonate with chloromethyl side groups, which is then purified by dissolution / precipitation. A side group substitution reaction is carried out by adding 1-methylimidazolium to a polar solvent to obtain an imidazolium halide-type ionized polycarbonate. Subsequently, a zinc-free solution is used... 2+ The zinc-based solid polymer electrolyte membrane was obtained by anion exchange with TFSI-salt followed by desalting and purification. The ionic liquid was then mixed with zinc salt, and a membrane was fabricated using a casting method, followed by drying and peeling to obtain the membrane. The large volume and high degree of charge delocalization of anions in the ionic liquid are beneficial for reducing ion-pair interactions, providing a better ion transport environment for the zinc-based solid electrolyte membrane and addressing the issue of Zn content in existing zinc-based solid electrolytes. 2+ It has strong interactions with anions and polymer polar groups, which can easily lead to increased resistance to ion migration.

A photocurable composition is capable of forming a cured product that has good reliability in a high-temperature constant-humidity environment, especially good ion migration resistance in a temperature range of 100° C. or higher. The photocurable composition (Z) is obtained by adding an ion scavenger (Y) to a composition (X) containing a monofunctional acrylic monomer (A) and a multifunctional acrylic monomer (B), wherein the content of the monofunctional acrylic monomer (A) relative to 100 wt % of the composition (X) is from 40 wt % to 80 wt %, and the content of the multifunctional acrylic monomer (B) relative to 100 wt % of the composition (X) is from 10 wt % to 50 wt %. An inkjet ink composition contains the photocurable composition (Z); a cured product; and an electronic component.

The application provides a preparation method and application of a solid-state polymer electrolyte based on dynamic dipole compensation, and belongs to the technical field of solid-state polymer electrolytes.The solid-state polymer electrolyte is prepared by using polyurethane epoxy resin and PEO as polymers, compounding at the molecular scale to form a mechanical interlocking structure, and then doping and modifying the mechanical interlocking structure by MOF-177 material to obtain a new composite solid-state polymer electrolyte with "charge balance / dynamic dipole compensation". Through the synergistic effect of the mechanical interlocking composite structure and the MOF, a more uniform electric potential and a nearly "charge neutral" interface environment (referring to the minimization of interface potential fluctuation / electrostatic non-uniformity, rather than no potential difference) are constructed, so that the Li + migration energy barrier is reduced, ion migration and diffusion are improved, the uniform interface electric field and Li + flux are obtained, the "hot spot" deposition is weakened, the interface contact stability and the anti-branching ability are enhanced, and long cycle of the solid-state lithium metal battery is realized.

This invention relates to a polyoxymethylene-based halide composite solid electrolyte, comprising polyoxymethylene, lithium / sodium salt, halide, plasticizer, and organic solvent; the mass ratio of polyoxymethylene, lithium / sodium salt, halide, plasticizer, and organic solvent is 1:0.08~2:0.001~0.55:0.01~1:6~120. This invention introduces a suitable formulation ratio to achieve a balance between the mechanical strength and ion conduction of the solid electrolyte. Polyoxymethylene, as the main material, provides mechanical strength, ensuring the self-support of the structure, thermal stability, and inhibiting dendrite growth. Small amounts of halide, plasticizer, and organic solvent do not affect the overall mechanical strength and significantly improve lithium-ion migration efficiency, broaden the electrochemical stability window, and enhance ionic conductivity.

The application belongs to the technical field of structural energy, and particularly relates to a structural integrated energy skin with hierarchical pore limited hybrid superstructure. The energy skin comprises: a two-dimensional covalent organic framework film as a continuous phase host framework, a photoelectric active guest component located in the pore structure of the host framework and penetrating through the thickness direction of the film, a molecular level interface passivation layer introduced by a gate vapor pulse and discontinuously distributed on the host-guest heterojunction interface, and a charge selective contact structure. The host framework has a first pore structure for interface limitation and a second pore structure for guest transmission. During preparation, the guest is generated in situ in a limited space by gas phase permeation, and its grain boundary fusion is induced by passivation and flash solidification in cooperation with the gate vapor pulse. The application constructs a trinity physical constraint architecture of host-guest-interface, effectively inhibits ion migration and non-radiative recombination, realizes high stability output in a complex environment, and is suitable for mobile carrier load bearing skin.

This invention discloses a method and application for detecting fentanyl and toluenethiazide using a microfluidic chip coupled with ion mobility spectrometry (IMS), belonging to the field of analytical chemistry. The method utilizes a microfluidic chip platform coupled with IMS for detection, specifically including the following steps: using a dual-channel microfluidic chip platform filled with adsorbent material, fentanyl and toluenethiazide are enriched in the sample to be tested; then, IMS is used to detect the enriched fentanyl and toluenethiazide in the sample. The detection method provided by this invention has high repeatability, minimizes operator exposure to drugs throughout the process, and greatly improves the accuracy and detection efficiency. Furthermore, the detection method provided by this invention has a short testing time, high sensitivity, and is automated and environmentally friendly, enabling rapid screening of fentanyl and toluenethiazide in multiple matrices.

This invention relates to the field of flow battery technology and discloses a method and system for regulating self-excited oscillation in flow batteries. By integrating a flow oscillation generator into the electrolyte circulation loop of the flow battery, the periodic vortex ring oscillation and acoustic-fluid positive feedback phenomenon generated by the flow within the resonant cavity of this device are utilized to achieve pulsating regulation of electrolyte flow rate and pressure. This fundamentally improves the convective mass transfer efficiency at the electrode / electrolyte / diaphragm interface within the flow battery stack, thereby alleviating concentration polarization at the battery reaction interface caused by factors such as uneven flow rate, thickened diffusion boundary layer, and restricted ion migration. Furthermore, this device eliminates the need for long-term, additional electrical drive and complex control components, exhibiting a simple structure and stable operation.

This invention discloses a perovskite solar cell, comprising a transparent conductive layer, a hole transport layer, a perovskite absorber layer, an electron transport layer, and a back electrode layer stacked sequentially. The back electrode layer is a composite structure of an ITO layer and a metal layer. The perovskite solar cell also includes a dipole layer located between the electron transport layer and the ITO layer, with the dipole moment of the dipole layer pointing from the electron transport layer to the ITO layer. By incorporating a dipole layer in the perovskite solar cell, the work function of the electron transport layer and the back electrode layer is modulated to reduce the extraction barrier, resulting in a significant linear increase in the device's built-in potential, and substantial improvements in fill factor, photovoltage, and power conversion efficiency. Furthermore, the excellent ion-blocking ability of the dielectric material alumina enhances the drift scattering blocking effect of the P-N junction, effectively preventing ion migration within the device.

The application relates to a battery and a preparation method thereof. The battery comprises a shell and an electrode assembly located in the shell, the electrode assembly comprises a positive electrode sheet and a negative electrode sheet, the surface layer of the negative electrode sheet on the side facing the positive electrode sheet is an artificial solid electrolyte film, the artificial solid electrolyte film comprises a solid electrolyte and a film-forming agent, the film-forming agent can react with lithium ions to generate the solid electrolyte, and the residual mass ratio of the film-forming agent in the artificial solid electrolyte film is 1.1%-5%. In this way, the lithium ion migration dynamics of the whole region of the negative electrode can be optimized through the artificial solid electrolyte film, the lithium ion deintercalation rate of different regions of the negative electrode sheet is balanced, and the problem of lithium precipitation in the local region of the negative electrode is reduced. Meanwhile, the residual small amount of the film-forming agent is uniformly distributed in the artificial solid electrolyte film, the interface impedance of the negative electrode active material layer in the negative electrode sheet is reduced, the migration of lithium ions is further promoted, the internal resistance of the battery is preferably reduced, and the cycle performance of the battery is improved.

The present application relates to atmospheric pressure ion manipulation technology, specifically, the present application discloses a thermal desorption ionization reaction device, specifically, a thermal desorption ionization reaction device, comprising a stainless steel metal desorption ionization cavity, the metal desorption ionization cavity is a hollow circular cylinder with an open upper end and a closed lower end, an insulating cover for sealing the open upper end is arranged on the open upper end, and a gas and ion outlet is arranged in the middle of the insulating cover; the counter electrode and the electrode with holes are connected to the high-voltage output end of the high-voltage power supply and the ground electrode (or negative electrode) respectively. The voltage applied to the counter electrode and the electrode with holes is alternating current or direct current, and the voltage amplitude is 2000V. The present application improves the consistency and stability of batch production of thermal desorption ionization modules based on integrated design, reduces power consumption and processing cost, and is beneficial to the industrialization of mass spectrometry or ion mobility spectrometry.

This invention discloses a stable perovskite material based on DMePDA additive and its preparation method. The method involves introducing the diamine cation DMePDAI2 into the FAMAPbI3 system to construct a DJ-type quasi-two-dimensional perovskite structure. Due to the presence of diamine double-terminal —NH3 in the system… + Bonding to inorganic layers eliminates van der Waals gaps in the RP structure and shortens interlayer spacing, effectively weakening the quantum confinement of the material, thus suppressing ion migration while maintaining effective charge transport. This invention utilizes different material ratios in the perovskite system to establish DMePDA (FA) 0.5 MA 0.5 ) n‑1 Pb n I 3n +1 By controlling the n-value of the material to create a network, the carrier mobility of the high-n-through-network is significantly improved. X-ray detectors fabricated using this material exhibit extremely low dark current density and excellent X-ray sensitivity under low / medium bias. This invention achieves a comprehensive improvement in the low dark current, high sensitivity, and low mobility of perovskite materials, providing a stable and scalable material and process foundation for low-dose, high-resolution X-ray imaging.

This invention provides a coated and modified ultra-high nickel cathode material and its preparation method, belonging to the technical field of lithium-ion battery cathode materials. The coated and modified cathode material includes ultra-high nickel cathode material particles and a composite coating layer covering its surface. The coating layer consists of a Mg and F dual-doped sulfur chloride solid electrolyte, Li. 4.3 AlS 3.3 Cl 0.7 It is composed of Mg and conductive carbon black (CB). 2+ The introduction of Mg and F can regulate the lattice structure and enhance the lithium-ion migration rate. F⁻ doping can improve the Al-S bond energy and chemical stability, thereby forming a highly stable ion conduction network. The introduction of conductive carbon black constructs a continuous electronic conduction pathway, realizing the synergistic transport of ions and electrons. Through the above composite coating, the interfacial side reactions between the ultra-high nickel cathode and the electrolyte can be significantly suppressed, while reducing the growth of interfacial impedance, suppressing oxygen release and lattice collapse under high temperature and high pressure, thereby improving the cycle stability of the material. The Mg and F dual-doped Li₂ provided by this invention 4.3 AlS 3.3 Cl 0.7 The / CB coating modification scheme provides an efficient and feasible new approach for high-energy-density lithium-ion battery cathode interface engineering.

The application discloses a method for improving the performance of oxide solid electrolyte by calcium doping, and belongs to the technical field of solid-state batteries. The method comprises the following steps: mixing raw materials containing a calcium source, a sodium source, a rare earth source and a phosphorus source to obtain a precursor; sintering the precursor to obtain a calcium-doped sodium superionic conductor precursor; and performing ion exchange on the precursor and a lithium salt to obtain a calcium-doped oxide solid electrolyte with a chemical formula of Li 3+ x La 1‑x Ca x (PO4)2, and 0 < x <= 0.1. By partially replacing lanthanum ions with calcium ions, lithium vacancies are introduced, the crystal lattice is relaxed, and the lithium ion migration path is optimized by using the charge compensation mechanism, so that the room-temperature ionic conductivity of the material is significantly improved. The method has low raw material cost, simple process and strong universality, can be expanded to various oxide solid electrolyte systems such as NASICON and garnet, and has good application prospect in the field of solid-state lithium ion batteries.

This invention relates to the field of electrode materials technology, specifically to a high-entropy layered double hydroxide electrode material, its preparation method, and its application. The electrode material includes a metal substrate and a layered double hydroxide with a high-entropy structure grown in situ on the surface of the metal substrate. The layered double hydroxide consists of a main layer and intercalated anions filling the spaces between the main layers. The main layers include Ni, Co, Fe, Cu, and Al elements, and the intercalated anions are any one of phosphate, carbonate, or dodecyl sulfate. The high-entropy layered double hydroxide electrode material of this invention uses phosphate, carbonate, or dodecyl sulfate intercalation to adjust the interlayer structure, effectively expanding the interlayer spacing of the high-entropy layered double hydroxide to form an interlayer microenvironment more conducive to ion migration and interfacial reactions during electrochemical hydrodechlorination.

The application discloses a battery separator, a preparation method and a battery. The preparation method of the battery separator comprises the following steps: coating a coating liquid on the surface of a base film, then immersing the base film coated with the coating liquid into a coagulation bath, and then performing drying to obtain the battery separator. According to the application, the coating liquid comprises 3-5% of a polymer lithium salt, 9-15% of a binder and 80-88% of a solvent in terms of mass fraction. According to the preparation method of the battery separator, a porous polymer film with an ion selective transmission function can be constructed in situ on the premise of maintaining the mechanical properties of the PE base film, and the high lithium ion migration number and the high ion conductivity can be synergistically improved.

The invention discloses a method for detecting potential electric leakage defects of an LED device, and relates to the technical field of semiconductor photoelectric device detection. Aiming at the technical pain point that recessive microdefects (such as a metal migration channel caused by a V-shaped pit and dislocation) cannot be identified by the existing single spectroscopic detection, the invention provides a detection logic of reference parameter acquisition, defect stress excitation, parameter acquisition after excitation and differential analysis and judgment. Specific stress is applied to primarily screened qualified products, ion migration at potential defects is excited in an oriented mode, and hidden electric leakage is dominated. Potential defective products are accurately rejected by calculating parameter drift distances (VFL, IR) before and after stress. The method is not only suitable for interactive screens, but also suitable for high-reliability scenes such as vehicle-mounted display and high-end illumination, and can effectively intercept hidden lamp beads causing'caterpillar 'failure or early light attenuation, thereby remarkably improving the product yield and the terminal reliability.

This invention relates to a negative electrode for lithium-ion secondary batteries and a method for manufacturing the same. The ratio of the porosity to the orientation index (OI) of the carbon-based negative electrode active material of the negative electrode meets a predetermined range, thereby shortening the lithium-ion migration path in the negative electrode active layer and significantly reducing the diffusion resistance of lithium ions, resulting in excellent fast-charging performance of the negative electrode. Furthermore, the density of the negative electrode active layer is improved without compromising the shortened lithium-ion migration path, thus resulting in excellent energy density of the negative electrode.

The application relates to the technical field of fuel cell electrolyte, in particular to a SOFC composite electrolyte material based on a heterojunction, a preparation method and application, and the preparation method comprises the following steps: after a p-type semiconductor oxide phase and an n-type semiconductor oxide phase are ground and mixed, a p-type semiconductor oxide-n-type semiconductor oxide composite powder is obtained; the p-type semiconductor oxide-n-type semiconductor oxide composite powder and an oxygen ion conductor phase are compounded and mixed to obtain a multi-phase composite powder; the multi-phase composite powder is formed and heat-treated to obtain the SOFC composite electrolyte material based on the heterojunction. According to the application, a space charge region and a built-in electric field are formed at the interface through the heterojunction, ion migration activation energy is reduced, a multi-channel ion conduction network is constructed, and an electrolyte material capable of improving low-temperature ion conduction and blocking electron transmission is obtained.

A titanium-cobalt co-doped sodium manganate-based cathode material, its preparation method, and its application, relating to the field of sodium-ion battery technology, wherein the general structural formula of the titanium-cobalt co-doped sodium manganate-based cathode material is Na. 0.44 Mn 0.95 Co x Ti 0.05‑x O2, wherein titanium and cobalt are both doped at manganese sites and the sum of the molar fractions of titanium and cobalt is 0.05, and x is the molar fraction of cobalt doped at manganese sites, 0 < x ≤ 0.03. This invention constructs a stable doping system by synergistically introducing titanium and cobalt elements into the transition metal sites of sodium manganate cathode material without disrupting the main crystal lattice structure, inducing the formation of a sodium vacancy environment conducive to sodium ion migration, thereby improving the overall structural stability of the material.

This invention belongs to the field of nanocomposite functional material preparation technology, and discloses an alkali metal anode modified with an artificial SEI layer based on in-situ self-assembly of COF, its preparation method, and its application. This alkali metal anode can effectively and efficiently suppress dendrite growth, has a high Young's modulus, and the assembled battery exhibits strong cycle stability, good alkali metal ion migration rate, and good interfacial properties. The preparation method of this invention is simple; a COF layer is synthesized in-situ on the alkali metal surface through the self-deposition assembly of a COF precursor. This COF layer has a rich porous structure, which can uniformly induce alkali metal ion deposition and suppress dendrite growth. This overcomes the problem in existing alkali metal batteries where lithium dendrites easily form on the negative electrode, thus affecting battery performance.

The application discloses an ion migration detector and belongs to the technical field of substance detection. The ion migration detector comprises an ion migration tube and a filtering device. The ion migration tube is provided with a detection cavity, a circulating gas inlet and a circulating gas outlet. The circulating gas inlet and the circulating gas outlet are communicated with the detection cavity respectively. The filtering device comprises a filtering shell, a filter body, a pressing plate and a gas guide pipe. The inlet end of the filtering shell is communicated with the circulating gas outlet. The outlet end of the filtering shell is communicated with the circulating gas inlet. The pressing plate is arranged in the filtering shell. The internal space of the filtering shell is divided into a filtering cavity and a buffer cavity by the pressing plate. A plurality of through holes are arranged at intervals in the pressing plate. The buffer cavity is communicated with the filtering cavity through the through holes. The gas guide pipe and the filter body are located in the filtering cavity. The gas guide pipe penetrates through the pressing plate and is communicated with the buffer cavity. The inlet end of the filtering shell, the gas guide pipe, the buffer cavity, the filtering cavity and the outlet end of the filtering shell are communicated in sequence. In this way, the filtering effect and the detection accuracy are improved.

The utility model relates to chloride ion migration coefficient test technical field especially relates to a kind of splitting fixture for fast chloride ion migration coefficient test, including parallelly arranged upper frame plate and lower frame plate, support assembly and limiting component are set on lower frame plate, and lower pressure component is set on upper frame plate corresponding support assembly. Lower pressure component includes bearing plate, guide column and fixed plate, bearing plate and fixed plate are respectively set in guide column length both ends;Guide column vertically penetrates upper frame plate and is slidably connected with it, and fixed plate is set in guide column one end close to support assembly, and there is ram on fixed plate. Concrete test piece penetration surface faces down, back surface is towards ram, and its projection center and ram coincide, so that concrete test piece is bent back splitting under the action of ram, isolated test surface and stress area in operating process, avoid to destroy test surface, and static fracturing concrete test piece, can reduce microcrack propagation, ensure test accuracy.

This invention discloses a high-performance composite solid electrolyte and its preparation method, belonging to the technical field of electrochemical energy storage and solid electrolyte materials. The solid electrolyte comprises a porous inorganic solid electrolyte framework layer with interconnected channels, a pore wall interface anchoring layer, and a cross-linked polymer network within the channels. The interface anchoring layer is formed by reacting a sulfur-containing silane coupling precursor on the pore wall surface and copolymerizing it with the cross-linked network to achieve pore wall fixation and covalent bridging. The cross-linked network contains polyether segments and fixed anionic structural units introduced by the polymerization of 4-styrenesulfonyltrifluoromethylsulfonylimide lithium monomer. The electrolyte membrane is prepared through framework preparation, pore wall layering, depressurized wetting, and curing, which can reduce solid-solid interface impedance and its growth, increase the lithium-ion migration ratio, reduce the risk of dendrite penetration, and improve cycle stability and safety.

The application discloses a single-atom catalytic conductive carbon network reinforced sodium ferric sulfate positive electrode material and a preparation method thereof. The material is composed of sodium ferric sulfate active material particles and single-atom catalyst doped conductive carbon network embedded therein. The conductive carbon network is a carbon nanotube co-doped with non-metallic elements. The non-metallic elements are at least two of nitrogen, sulfur and phosphorus. The single-atom catalyst is one or more metal atoms selected from iron, copper, nickel, cobalt and manganese. The metal atoms are coordinated with the non-metallic elements and anchored on the doped carbon nanotube in the form of single atoms. The multi-element doping significantly improves the electronic conductivity of the carbon nanotube, the single-atom catalytic site accelerates the ion migration rate, and the interface impedance is significantly reduced. The composite positive electrode material prepared by the application has high reversible capacity, super-long cycle life (0.5C, capacity retention rate > 88% after 500 cycles), and significantly improved electrochemical performance, and has a high commercial application prospect.