43 results about "Lithium doping" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a lithium-doped silicon-carbon composite material, a preparation method thereof, a negative plate and a lithium ion battery. The preparation method of the lithium-doped silicon-carbon composite material comprises the following steps: carrying out reduction reaction and activated pore-forming on a mixed material containing a carbon source, an organic pore-forming agent, a lithium supplement agent and a reducing agent to obtain lithium-doped porous carbon; performing first deposition on the lithium-doped porous carbon and mixed gas containing an inorganic lithium compound and an organic lithium compound; carrying out second deposition on the material obtained after the first deposition and silane gas to obtain a lithium compound doped silicon carbon precursor material; and mixing the lithium compound doped silicon carbon precursor material, an organic metal compound, asphalt and an organic solvent, performing spray drying, and then performing carbonization. According to the preparation method, the initial efficiency and the power performance of the silicon-carbon composite material can be improved.

The embodiment of the invention provides an alpha-Ga2O3 / Li doped NiO vertical heterojunction detector and a preparation method and application thereof, and relates to the technical field of semiconductor materials. The preparation method of the detector comprises the following steps: S1, preparing a gallium source precursor aqueous solution, and enabling the gallium source precursor aqueous solution to epitaxially grow an alpha-Ga2O3 film layer on a substrate through an atomization chemical vapor deposition technology; s2, preparing a nickel source precursor aqueous solution, adding a lithium source into the nickel source precursor aqueous solution, and epitaxially growing a Li-doped NiO film layer on the alpha-Ga2O3 film layer by using the lithium-doped nickel source precursor aqueous solution through an atomization chemical vapor deposition technology; and S3, depositing a first electrode layer on the Li-doped NiO film layer by adopting a magnetron sputtering technology, and depositing a second electrode layer on the Li-doped NiO film layer by adopting a magnetron sputtering method or depositing the second electrode layer on the alpha-Ga2O3 film layer by adopting an electron beam evaporation technology. According to the invention, the Mist-CVD technology is adopted for the first time to successfully prepare the alpha-Ga2O3 / Li-doped NiO vertical heterojunction, and the alpha-Ga2O3 / Li-doped NiO vertical heterojunction is applied to a solar-blind ultraviolet photoelectric detector.

The invention belongs to the technical field of lithium batteries, and relates to a preparation method of a double-coated silicon-carbon composite material, an electrode and a lithium battery, the method comprises the following steps: soaking a lithium dopant and an MOF material in a first organic solvent, adding a template agent and a catalyst, reacting, filtering, and freeze-drying to obtain a gel complex; in an inert atmosphere, heating the gel complex to a first preset temperature, introducing carbon dioxide according to a preset flow rate, cooling, adding into mixed acid, soaking, pickling, and drying in vacuum to obtain a porous carbon composite material; adding liquid silane, a phosphorane derivative, a dispersing agent, the porous carbon composite material and a silane coupling agent into a second organic solvent, performing spray drying, and performing primary carbonization to obtain a silicon-carbon precursor material; dissolving the resin in a third organic solvent, adding an ionic conductor and a silicon-carbon precursor material, carrying out secondary carbonization, cooling to a second preset temperature, and introducing a reducing gas to obtain a double-coated silicon-carbon composite material; the conductivity is improved, the interface stability is improved, and the full-charge expansion is reduced.

The invention discloses a lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries. Through an integrated process of magnetic field-gradient coprecipitation + in-situ lithium doping-spray drying-segmented calcination, Fe3O4 magnetic seeds are added into a mixed metal solution, magnetic field induction is combined, pH is precisely controlled to be gradually reduced from 9 to 8 in cooperation with a triammonium citrate solution, and meanwhile, a magnetic seed-carbon layer dual conductive network is constructed; compared with the prior art, the preparation method has the advantages that the precursor dispersity, grain orderliness and purity of the lithium manganese iron phosphate positive electrode material are improved, the Li < + > migration path and electron conduction efficiency are optimized, the 5C discharge specific capacity of the material reaches 121-132mAh / g, the 500-time cycle capacity retention rate reaches 90.3-94.1%, and the first charge-discharge efficiency reaches 95.5-97.2%.

Provided are a negative electrode active material which includes negative electrode active material particles which includes a silicon oxide (SiOx, 0<x≤2); and at least one lithium silicate selected from Li2SiO3, Li2Si2O5, and Li4SiO4 in at least a part of the silicon oxide. A signal generated in a region of 200 to 600 cm−1 according to a Raman spectrum is subjected to deconvolution into three peaks, which are set to peak A, peak B, and peak C from lowest to highest of an absolute value of a wavenumber. Also disclosed are a method of preparing the same, and a negative electrode and a lithium secondary battery including the negative electrode active material.

This invention relates to the field of lithium-ion battery technology, specifically to a composite electrode material and its preparation method. The preparation method includes the following steps: using tin, red phosphorus, and lithium salt in a molar ratio of 3.5–3.9:3:0.5–0.1 as raw materials, ball milling is performed in an inert gas to obtain lithium-doped tin phosphide material; the lithium-doped tin phosphide material and carbon nanotube material are mixed uniformly, and calcined under a protective atmosphere to construct a carbon conductive network on the surface of the lithium-doped tin phosphide material to obtain modified tin phosphide material; the modified tin phosphide material is mixed uniformly with additives to obtain the composite electrode material. This invention achieves multi-dimensional modification of tin phosphide anode material through stepwise synergistic processing, solving the technical problem of decreased electrochemical performance of existing tin phosphide anode materials due to volume expansion and lithium loss.

The application provides a double-coating lithium iron phosphate positive electrode sheet, a preparation method and application thereof. The preparation method comprises the following steps: mixing modified large-particle lithium iron phosphate, modified small-particle lithium iron phosphate, a conductive agent, a binder and a solvent to obtain a first slurry and a second slurry; adopting double-layer slot extrusion coating to coat the first slurry on the surface of a current collector and coat the second slurry on the surface of the first slurry; and drying and rolling to obtain the double-coating lithium iron phosphate positive electrode sheet; the modified large-particle lithium iron phosphate is doped with Ti and Nb, and the modified small-particle lithium iron phosphate is doped with Mg and Al. The application adopts a multi-element doped positive electrode material combined with a double-layer coating preparation method to avoid the shortcomings of LFP materials, improve the rate performance, high-temperature performance and cycle performance of LFP, and has the advantages of simple preparation process and easy industrial production. The prepared positive electrode material and the secondary battery using the same have excellent comprehensive performance, and have a wide application prospect in the field of power batteries.

The application discloses a first main group metal gradient doped Cs2NaBiCl6 perovskite material and a preparation method and application thereof, and belongs to the technical field of photocatalytic material for preventing and treating air pollution. The preparation method comprises the following steps: dissolving cesium chloride, sodium chloride, lithium chloride and bismuth chloride in hydrochloric acid and stirring uniformly; placing the mixture into a reaction kettle to perform hydrothermal reaction; after the reaction is completed, centrifuging, washing and drying are performed to obtain Cs2Na 1‑ x Li x BiCl6, wherein x is 0.1-0.5. The lithium-doped cesium-sodium-bismuth-chlorine double perovskite photocatalyst has stronger photocatalytic reduction capacity, and can greatly improve the activity of the lithium-doped cesium-sodium-bismuth-chlorine double perovskite in photocatalytic reduction of carbon dioxide, and the generation rate of carbon monoxide can reach 10.25 mu mol per hour ‑1 ·g ‑1 .

The invention discloses a modified porous carbon composite material and a preparation method thereof, and the preparation method comprises the following steps: adding porous carbon and a heteroatom compound into a silver salt solution, and carrying out a hydrothermal reaction to obtain silver salt / heteroatom compound doped porous carbon; and depositing lithium salt in the silver salt / heteroatom compound doped porous carbon through an electrochemical deposition method, carbonizing and activating to obtain the modified porous carbon composite material. The obtained material utilizes silver doping and lithium doping to improve the electronic and ionic conductivity of the porous carbon material, reduces defects, improves the first efficiency and diffusion coefficient thereof, and is applied to the silicon carbon material to improve the rate capability and the first efficiency thereof.

The present invention relates to a nickel monoxide as a hole-conducting material and a perovskite solar cell containing the hole-conducting material as a hole-conducting layer, as well as a method for producing the nickel monoxide. The hole-conducting nickel monoxide (NiO) according to the invention x The composition is characterized by the addition of magnesium or of magnesium and lithium together as dopants. The mole fractions of the dopants are in the range of 2% to 4% for magnesium alone and 2% to 4% for magnesium together with 0.75% to 1.25% for lithium, and in particular 2.5% to 3.5% for magnesium and 0.9% to 1.1% for lithium. The NiO doped according to the invention x is of increased stability. A perovskite solar cell, which consists of a NiO doped with magnesium and lithium. xThe inventive method for producing a NiO-doped layer, comprising a hole-conducting layer, exhibits increased stability and improved efficiency. x is based on spray pyolysis in an oxidizing atmosphere. In the process according to the invention, the applied layer is doped with NiO. x First annealed and then cooled, after which further processing or storage is possible.

The application belongs to the technical field of refractory materials, and provides a tundish castable and a preparation method thereof.The tundish castable comprises the following components in parts by weight: bauxite clinker 54-57 parts, coke 23.5-25 parts, kyanite powder 3.8-4.2 parts, alpha-alumina micropowder 3-3.2 parts, high-aluminum cement 4.7-5.2 parts, silica ash 6.8-7.3 parts and lithium-doped magnesium oxide nano powder 2.7-3 parts.The application increases the amount / content of silica ash, reduces the apparent porosity of the prepared sample after 1400 DEG C heat treatment, and further improves the strength.

The invention belongs to the technical field of partial discharge ultraviolet detection, and particularly relates to a nickel oxide / zinc gallate heterojunction solar-blind ultraviolet photoelectric detector and application thereof. The invention discloses a nickel oxide / zinc gallate heterojunction solar-blind ultraviolet photoelectric detector, and the detector comprises an aluminum oxide substrate; the zinc gallate epitaxial layer grows on the aluminum oxide substrate through metal organic chemical vapor deposition; the lithium-doped p-type nickel oxide layer grows on the zinc gallate epitaxial layer through a pulse laser deposition technology; and the titanium / gold metal electrode layer is deposited on the lithium-doped p-type nickel oxide layer. The device has a high rectification ratio of 106, an ultralow dark current of 0.1 pA under a bias voltage of 6V, an excellent detection rate of 7.1 * 10 < 18 > Jones and an extremely low noise equivalent power of 2.56 * 10 <-19 > W / Hz < 1 / 2 >, so that the device becomes an ideal candidate material for partial discharge detection, security monitoring, environmental monitoring, space exploration and other applications.

The invention discloses an oxygen vacancy enriched lithium-doped zinc oxide nanotube reinforced polyethylene oxide (PEO)-based solid electrolyte and a preparation method thereof. The electrolyte takes PEO as a polymer matrix, lithium bis (trifluoromethanesulfonimide) (LiTFSI) as a lithium salt, and a three-dimensional hollow ZnO nanotube (LZN) doped with a lithium element as an inorganic reinforcing filler. By introducing Li < + > into ZnO crystal lattices for doping, a large number of positively charged oxygen vacancies can be induced to form, and the oxygen vacancies as Lewis acid sites have strong interaction with lithium salt anions to promote dissociation of lithium salt, so that the free Li concentration and ion mobility in the system are improved. The three-dimensional interconnection structure of the hollow nanotube constructs a continuous organic-inorganic ion transmission channel at the same time, so that the interface impedance is further reduced, and the overall ionic conductivity of the electrolyte is improved. The Li < + > conductivity of the prepared composite solid electrolyte at 60 DEG C can reach 8.12 * 10 <-4 > S / cm, and the composite solid electrolyte has excellent electrochemical stability and high coulombic efficiency. LiFePO4 / Li and NCM622 / Li all-solid-state batteries assembled by using the electrolyte membrane show good cycling stability and high-voltage adaptability. Through collaborative design of oxygen vacancy engineering and a hollow structure, the comprehensive performance of the polymer electrolyte is remarkably improved, and a new solution is provided for development of a high-energy-density and long-service-life all-solid-state lithium battery.

The present invention relates to expanded carbon for improving the output of a secondary battery and a method for manufacturing the same. The present invention comprises a method for manufacturing expanded carbon for enhancing the output of a secondary battery, wherein the method comprises the steps of: mixing lithium metal into a water-soluble oil and then mixing carbon to produce a mixture; reacting the mixture at 200 to 450°C while applying pressure to produce a lithium-carbon compound in which lithium is incorporated between carbon layers; and heat-treating the lithium-carbon compound to produce expanded carbon in which lithium is detached and removed from the lithium-carbon compound, thereby expanding the carbon layers; wherein the heat treatment is characterized by rapidly heating the lithium-carbon compound to 450 to 1,000°C by passing an electric current through it. The technical gist of the invention is the expanded carbon produced thereby.

The application discloses an organic superlattice material, a lithium-doped organic superlattice material and a preparation method and application thereof, and relates to the technical field of superlattice materials.The organic superlattice material comprises a first organic crystal layer and a second organic crystal layer which are alternately stacked, the first organic crystal layer comprises a network structure formed by a first small-molecule organic compound, and the second organic crystal layer comprises a network structure formed by a second small-molecule organic compound; wherein the first small-molecule organic compound comprises a first monocyclic aromatic compound, and the first monocyclic aromatic compound has a proton donor group; and the second small-molecule organic compound comprises a second monocyclic aromatic compound, and the second monocyclic aromatic compound has a proton acceptor group.A new organic superlattice material is provided, which is applied to a solid-state electrolyte and can improve ionic conductivity.

The application belongs to the technical field of lithium batteries, and relates to a preparation method of a double-coated silicon-carbon composite material, an electrode and a lithium battery.The method comprises the following steps: placing a lithium dopant and a MOF material in a first organic solvent, adding a template agent and a catalyst, reacting, filtering, freeze-drying and obtaining a gel composite; in an inert atmosphere, the gel composite is heated to a first preset temperature, carbon dioxide is introduced at a preset flow rate, the temperature is lowered, the gel composite is soaked in mixed acid, pickling is performed, vacuum drying is performed, and a porous carbon composite material is obtained; liquid silane, a phosphine derivative, a dispersing agent, the porous carbon composite material and a silane coupling agent are added to a second organic solvent, spray drying is performed, primary carbonization is performed, and a silicon-carbon precursor material is obtained; resin is dissolved in a third organic solvent, a fast ion conductor and the silicon-carbon precursor material are added, secondary carbonization is performed, the temperature is lowered to a second preset temperature, a reducing gas is introduced, and a double-coated silicon-carbon composite material is obtained; the conductivity is improved, the interface stability is improved, and the full charge swelling is reduced.

The invention provides a microwave-rheological phase coupling preparation method of a high-uniformity lithium manganese iron phosphate precursor. The microwave-rheological phase coupling preparation method comprises the following steps: (1) preparing a uniformly nucleated Mn < 2 + > / Fe < 2 + > precursor by using a microwave-assisted coprecipitation method; (2) adding the Mn < 2 + > / Fe < 2 + > precursor, lithium dihydrogen phosphate and a doping system into a rheological medium in proportion, and constructing a phosphorization and multi-element doped non-Newtonian fluid reaction environment in a rheological phase medium to obtain a pasty precursor compound; and (3) performing low-temperature crystallization and synchronous carbon coating on the pasty precursor compound under a first preset condition to obtain the carbon-coated lithium iron manganese phosphate precursor. The method comprises the following steps: firstly, inducing ions to instantaneously and uniformly nucleate by utilizing a microwave field, and solving the problem of fractional precipitation of Mn / Fe; then, a non-Newtonian fluid reaction environment is constructed, and atomic-scale mixing and morphology directional regulation and control are achieved; a lattice stabilizer and an oxygen vacancy regulating agent are synchronously introduced, so that the structural stability is improved.

An ultrathin lithium-doped copper foil composite strip, its preparation method, and its applications are disclosed. This ultrathin lithium-doped copper foil composite strip exhibits high interfacial bonding strength between metallic lithium and the copper foil substrate. The dopant elements in the copper foil undergo rearrangement and segregation on the copper foil substrate surface, self-regulating the nucleation sites for metallic lithium deposition, achieving uniform nucleation and deposition of metallic lithium, and effectively suppressing lithium dendrite growth. Furthermore, the addition of dopant elements to the copper foil not only refines the grain size and increases the toughness of the copper substrate, thus enabling the preparation of thinner copper current collectors, but also reduces the copper content in the current collector, thereby lowering the current collector cost.

This invention discloses a Schottky diode based on cubic boron nitride (c-BN) single crystal material. The fabrication method includes the following steps: A cleaned bulk c-BN single crystal is covered with tape, exposing only the area to be plated with electrodes. An Au metal electrode is deposited on one side of the bulk c-BN single crystal, and then the tape is removed. In a glove box, the oxide layer on the surface of a lithium sheet is scraped off, and the sheet is placed on the Ag-plated side of a PCB board. The unplated side of the bulk c-BN single crystal is then tightly attached to the lithium sheet. Fine metal wires are used to connect and fix the Ag electrode on the PCB board to the Au electrode on the bulk c-BN single crystal. After electrochemical doping, an Au metal electrode is deposited on the lithium-doped side of the c-BN crystal. In this invention, lithium atoms are introduced onto the c-BN surface, and their energy levels are located at shallow levels, thereby effectively improving the interfacial contact quality between the metal and c-BN. This improvement further reduces the contact barrier ΦB between the c-BN single crystal and the metal by reducing the interfacial state density.

The application discloses a preparation method of a double-layer coated silicon-carbon composite material, which comprises the following steps: uniformly mixing acid-based resin and organic alkali-based pore-forming agent, then adding the mixture into lithium carboxymethyl cellulose, uniformly dispersing, spray drying, transferring the obtained material into a tube furnace for carbonization, naturally cooling to room temperature, and obtaining lithium-doped porous carbon; adding niobium salt and titanium salt into liquid silane to prepare a 1-10wt% solution in an organic solvent, uniformly dispersing, then adding the lithium-doped porous carbon, uniformly dispersing, spray drying, transferring into a tube furnace for sintering, obtaining titanium niobate coated silicon-carbon composite material, transferring into a tube furnace, and depositing amorphous carbon on the surface of the titanium niobate coated silicon-carbon composite material, thereby obtaining the titanium niobate coated silicon-carbon composite material. The material obtained by the application can improve the initial efficiency, fast charging performance and reduce the expansion.

The invention provides cobaltosic oxide, cobalt carbonate, a preparation method of the cobaltosic oxide and the cobalt carbonate and a lithium cobalt oxide positive electrode material, and relates to the technical field of battery materials. The cobaltosic oxide has a core-shell structure, and an inner core and a shell layer of the cobaltosic oxide have the same element composition; the thickness of the shell layer of the cobaltosic oxide is 0.08 to 0.16 [mu] m; the cobaltosic oxide contains a doping element, and the difference value between the ion radius of the doping element and the radius of Co < 2 + > is 5-10 pm; and the particle size variation D50 of the cobaltosic oxide subjected to 0.75 T pressing is less than 1.8 mu m. The cobaltosic oxide is good in structural stability, the morphology is kept complete after lithium doping, the problem of particle crushing or pulverization caused by volume expansion and shrinkage is avoided, particles are in closer contact during electrode coating, the interface impedance is reduced, and the polarization phenomenon in the charging and discharging process is reduced.

The present disclosure relates to a modular, lithium-doped, solid state, organic neutron multiplicity counter apparatus. In some embodiments the apparatus makes use of at least one lithium-doped, solid state, organic scintillator detector element. A readout device is included which is coupled to the lithium-doped, solid state, organic scintillator detector element for collecting information received by the lithium-doped, solid state, organic scintillator detector element. The lithium-doped neutron multiplicity counter apparatus is sensitive to thermal neutrons, fast neutrons and gamma-rays for carrying out neutron multiplicity counting.

This invention relates to the field of secondary battery technology, and particularly to a high-rate coal-based hard carbon composite material, its preparation method, and its application. The preparation method includes the following steps: S1. Mixing and reacting a coal-based material with an aqueous solution of an organic oxidant, filtering, and drying to obtain an oxidized coal-based material; S2. Mixing and grinding the oxidized coal-based material with lithium carboxymethyl cellulose to obtain a hard carbon precursor material; S3. Mixing the hard carbon precursor material, catalyst, and metal powder evenly, adding the mixture to a resin solution for even dispersion, drying, and carbonization to obtain the coal-based hard carbon composite material. Through chemical reaction, lithium doping of the coal-based material reduces irreversible capacity and improves initial efficiency and specific capacity; simultaneously, the carbonization of lithium carboxymethyl cellulose forms pores, increasing specific capacity, and its catalysis causes the carbon-based material to form an isotropic carbon structure, improving the material's power performance; and silver doping further improves the material's electronic conductivity and power performance.

The invention relates to the technical field of key electrode materials of sodium-ion batteries, in particular to a layered oxide positive electrode material, in particular to a method for realizing controllable preparation of an ordered / disordered structure of a transition metal layer (TM layer) by accurately controlling the lithium doping amount, and a high-performance sodium-ion battery positive electrode material obtained by the method, and the general formula of the positive electrode material is Na < 0.85 > Li < x > M < 1-x > O < 2 >, a lithium-ion battery which is obtained by substituting a part of transition metal atoms in Na < 0.85 > MO2 with lithium and has a P2 phase, a P2 / P3 phase or a P3 phase; wherein M represents a transition metal, and x is 0.3 or less and greater than 0. The preparation method of the sodium ion positive electrode material comprises the following steps: mixing a transition metal source precursor and a sodium source, and carrying out calcination reaction for 12-18 hours at 800-1000 DEG C in an oxygen-containing atmosphere to obtain the sodium ion positive electrode material. According to the specific TM layer ordered sodium ion positive electrode material disclosed by the invention, a P-phase material with high first efficiency and high working voltage is realized, and meanwhile, high structural stability is also obtained.

The invention provides a lithium-containing carbonate precursor and a preparation method thereof, a lithium-containing oxide precursor and a positive electrode material, the lithium-containing carbonate precursor comprises spheroidic secondary particles, and the secondary particles comprise a plurality of sheet-shaped primary particles. According to the lithium-containing carbonate precursor disclosed by the embodiment of the invention, the lithium element is uniformly introduced into the carbonate precursor through front-end lithium doping, so that the lithium element is uniformly distributed, and the problem of impurity phase generation caused by excessive or insufficient local lithium in a later sintering process in the prior art can be avoided; meanwhile, uniform distribution of the lithium element is beneficial to formation of a complete layered result, mixed arrangement of cations is reduced, and the stability of a crystal structure is improved; in addition, the lithium element in the lithium-containing carbonate precursor is uniformly distributed, so that the diffusion rate of lithium ions in the material can be improved, the obstruction of ion migration is reduced, and the lithium-containing carbonate precursor has relatively good rate capability and cycle performance.

This invention discloses a positive electrode active material, a positive electrode sheet, and an electrochemical device, relating to the field of electrochemical energy storage. The positive electrode active material includes lithium cobalt oxide in the O2 phase doped with Al and M, wherein the molar ratio of Co, Al, and M in the lithium cobalt oxide is (1-b-c):b:c, satisfying the relationship 0.00004≤c×b×(E M‑0 / 600)≤0.00085; M is a metallic element with a bond energy of 600-800 kJ / mol with O, and the ionic radius of the M ion in its six-coordinate structure is 0.6-0.75 Å. This application uses Al doping in lithium cobalt oxide to enhance interfacial and structural stability, and broadens the Li-O bond through the large ionic radius and high metal-oxygen bond energy of the cation M. + Migration channel, alleviate Li + The lattice stress during the insertion / extraction process enhances the structural robustness of O2-phase lithium cobalt oxide from multiple dimensions, including bulk material structure, ion transport kinetics, and surface stability, thereby improving its overall performance under high-pressure cycling.

A secondary battery and an electronic device. By adjusting the components of a positive electrode and an electrolyte in the secondary battery, the discharge performance is improved. The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte; the positive electrode comprises a positive electrode current collector, and a titanium dioxide material layer and a positive electrode material layer which are disposed on the positive electrode current collector; the positive electrode material layer comprises lithium iron phosphate and lithium manganese oxide, and the electrolyte comprises ethylene glycol bis(propionitrile)ether; the lithium iron phosphate is doped with a boron element, and the lithium manganese oxide is doped with a copper element and a tin element.

The invention relates to the technical field of lithium ion batteries, in particular to a composite electrode material and a preparation method thereof.The preparation method comprises the following steps that tin, red phosphorus and lithium salt with the molar ratio being (3.5-3.9): 3: (0.5-0.1) serve as raw materials, ball milling treatment is conducted in inert gas, and a lithium-doped tin phosphide material is prepared; the preparation method comprises the following steps: uniformly mixing a lithium-doped tin phosphide material and a carbon nanotube material, calcining in a protective atmosphere, and constructing a carbon conductive network on the surface of the lithium-doped tin phosphide material to prepare a modified tin phosphide material; and uniformly mixing the modified tin phosphide material with an additive to prepare the composite electrode material. Multi-dimensional modification of the tin phosphide negative electrode material is realized through step-by-step cooperative treatment, and the technical problem that the electrochemical performance of the existing tin phosphide negative electrode material is reduced due to volume expansion and lithium loss is solved.

The application discloses an electrochromic film and a preparation method and application thereof, relates to the technical field of functional materials, and comprises the following steps: providing a V2O5 amorphous film; converting the V2O5 amorphous film into a lithium-containing V2O5 amorphous film by an electrochemical lithiation method with a lithium salt solution as a lithium source; and obtaining a lithium-doped z-V2O5 film by annealing the lithium-containing V2O5 amorphous film, namely the electrochromic film. The electrochromic film is prepared by the method of electrochemical lithiation combined with subsequent annealing. When a voltage load is applied to the electrochromic film prepared by the electrochemical lithiation method, there are infrared transmission or infrared blocking states, the electrochromic film reversibly changes while greatly changing the transmittance of the infrared waveband, the infrared modulation amplitude reaches 70%, and the problem that the infrared modulation amplitude of the layered V2O5 crystal film is small is effectively solved.