188results about How to "Uniform deposition" patented technology

The preparation method of the silicon-carbon composite material comprises the following steps: uniformly mixing a carbon source, a pore forming agent and a cross-linking agent, and introducing peroxide gas into a tubular furnace for sintering to obtain porous carbon; uniformly mixing the porous carbon with liquid silane and a surfactant, and transferring the mixture into a high-pressure reaction kettle for reaction to obtain a silicon-carbon precursor; and introducing the obtained material into a carbon source gas containing a heteroatom gas for deposition to obtain the silicon-carbon composite material. The obtained material generates porous carbon with high strength and high pore volume by utilizing the cross-linking agent and the pore-forming agent thereof, so that the expansion is reduced; and the liquid silane has the characteristics of low decomposition temperature, low cost and high safety performance, so that the specific capacity is improved, and the cost is reduced.

The invention relates to a preparation method of composite porous carbon beneficial to silicon deposition and a silicon-carbon composite negative electrode. The method comprises the following steps: (P1) carrying out surface oxidation treatment on porous carbon fine powder to obtain oxidized porous carbon fine powder; (P2) adding the oxidized porous carbon fine powder and ether polycarboxylic acid silanol into a solvent to obtain ether polycarboxylic acid silanol modified porous carbon fine powder; the ether polycarboxylic acid silanol is prepared by copolymerizing a polyether macromonomer, an acrylic monomer and an alkenyl silane coupling agent in water; (P3) soaking the ether polycarboxylic acid silanol modified porous carbon fine powder in a salt aqueous solution to obtain catalyst-loaded porous carbon; (P4) mixing the porous carbon loaded with the catalyst with a carbon source precursor solution, and performing spray drying to obtain a composite carbon precursor; and (P5) carbonizing and activating the composite carbon precursor to obtain the composite porous carbon beneficial to silicon deposition. The composite porous carbon prepared by the invention is beneficial to more uniform deposition of silicon in pores of the core porous carbon fine powder.

The invention provides a silicon carbon material with a multilayer coating structure and a preparation method and application thereof, and relates to the technical field of battery materials. The silicon-carbon material with the multi-layer coating structure comprises a porous carbon core body, and a first carbon layer and a second carbon layer which sequentially coat the porous carbon core body from inside to outside, and the porous carbon core body comprises porous carbon and nano silicon particles deposited on the surface and in pore channels of the porous carbon; and a conductive nano carbon filler is dispersed in the second carbon layer. The silicon carbon material with the multilayer coating structure provided by the invention is used as a lithium ion battery negative electrode material, and has excellent specific capacity, coulombic efficiency and cycle performance. The result of the embodiment shows that when the silicon carbon material with the multi-layer coating structure is applied to the lithium ion battery, the first reversible capacity is 1882-2071 mAh / g, the first coulombic efficiency is 92.6-94.1%, and the capacity retention ratio of 100 cycles is 95.3-97.7%.

The invention provides a preparation method of a high interface strain polymer electrolyte for a lithium metal battery, and belongs to the technical field of lithium metal batteries, and the preparation method specifically comprises the following steps: firstly preparing a precursor solution A containing a lithium salt and an organic solvent, then preparing a precursor solution B obtained by mixing a polymer monomer, an initiator, a cross-linking agent and the lithium salt, mixing the precursor solution A and the precursor solution B, and carrying out vacuum drying to obtain the high interface strain polymer electrolyte for the lithium metal battery. And assembling a lithium metal battery by using the polymer as an electrolyte, and drying to obtain the high interface strain polymer electrolyte which is formed in situ in the positive and negative electrode interfaces of the lithium metal battery. By designing the proportion of fluorine element and oxygen element in a polymer electrolyte chain segment, the coordination strength of Li-O in a polymer electrolyte body phase is reduced, and the interface volume deformation during polymer lithium ion removal is improved, so that the potential difference of an electrolyte / lithium metal interface is reduced, the interface lithium deposition is homogenized, and the lithium dendrite growth is inhibited; and the cycling stability of the lithium metal battery is finally improved.

The invention relates to a preparation method and application of an organic-inorganic artificial composite solid electrolyte interface layer, and belongs to the technical field of lithium metal batteries. The organic polymer, the black phosphorene, the conductive carbon black and other inorganic substances are uniformly mixed to construct the organic-inorganic artificial composite interface layer, and the organic-inorganic artificial composite interface layer can induce uniform lithium deposition, reduce the local current density caused by nonuniformity and roughness of the surface of the copper current collector, reduce the lithium nucleation barrier, and improve the lithium ion battery performance. Meanwhile, the affinity of deposited lithium and a current collector is enhanced, the interface impedance of the negative-electrode-free lithium metal battery is remarkably reduced, and the lithium dendrite growth of a lithium metal negative electrode is inhibited; the cathode-free lithium metal battery assembled by adopting the copper current collector modified by the organic-inorganic artificial composite interface layer shows long cycle stability, good rate capability and remarkable safety performance, and has a wide commercial application prospect.

The invention discloses a solid-state lithium battery and a preparation method thereof and belongs to the technical field of battery processing. The preparation method of the solid-state lithium battery comprises the following steps: S1, assembling a positive plate, a diaphragm and a negative plate into a dry cell; wherein a composite film layer is cured on a current collector base material of the negative plate, and rubidium nitrate is added into the composite film layer; s2, injecting the gel precursor solution into a dry battery cell, fully standing, and charging the battery cell to 100% SOC; wherein the gel precursor solution contains an electrolyte, a cross-linking agent and an initiator; and S3, heating to initiate a chemical cross-linking reaction of a cross-linking agent in the gel precursor solution, and carrying out in-situ polymerization and curing on the surface of each component of the dry cell and in internal pores thereof to obtain a gel polymer electrolyte, thereby forming the solid-state lithium battery. According to the invention, the interface resistance can be reduced, and the lithium ion transmission capability and efficiency are improved.

The invention relates to the technical field of new energy, in particular to an extensible composite hole transport layer and a perovskite solar cell based on the extensible composite hole transport layer, and a preparation method of the perovskite solar cell comprises the following steps: forming a nickel oxide film on transparent conductive glass through magnetron sputtering; soaking the nickel oxide thin film to form a self-assembled monomolecular layer; forming a perovskite active layer on the self-assembled monomolecular layer; forming an electron transport layer on the perovskite active layer; and forming an electrode on the electron transport layer. According to the method, the preparation size of the hole transport layer can be expanded, and the photoelectric conversion efficiency of the perovskite solar cell can be improved.

The invention provides an electrolyte, which comprises a lithium salt and an organic solvent, and the organic solvent comprises a cyclic non-coordination solvent represented by the following formula (I) # imgabs0 # (I), in the formula (I), R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are respectively and independently selected from a hydrogen atom, a chlorine atom, a bromine atom, a fluorine atom, a C1-C3 alkyl group, a C1-C3 alkoxy group, a fluorine-substituted C1-C3 alkyl group or a fluorine-substituted C1-C3 alkoxy group. The electrolyte provided by the invention can be applied to the lithium metal secondary battery, and can significantly improve the cycle stability and safety of the battery and prolong the cycle life of the battery; meanwhile, decomposition of the coordination type solvent can be effectively inhibited, and uniform deposition of metal lithium dendrites is realized, so that the stability of the electrolyte is improved; and moreover, the high-temperature storage gas production inhibition effect is obvious.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a lithium ion battery, and belongs to the technical field of electrochemistry. The negative electrode active material comprises a composite core material and a coating material, the composite core material comprises a substrate material and a first material, the substrate material is provided with a plurality of pores, and the first material is arranged on the pore walls of the pores of the substrate material; the coating material coats at least part of the outer surface of the composite core material; wherein the nucleation overpotential of lithium on the first material is smaller than the nucleation overpotential of lithium on the coating material, so that lithium ions are more prone to nucleation and deposition on the first material, and formation of lithium dendrites is reduced; the coating material further protects the inner core material and prevents the inner core material from being in direct contact with the electrolyte, so that the probability of side reaction between the metal lithium and the electrolyte / electrolyte is reduced, and the cycle performance is improved.

The invention belongs to the field of thin films, and particularly discloses an atomic layer deposition method and a thin film prepared through the atomic layer deposition method. According to the deposition method, the reaction cavity, the two input pipeline systems, the outlet valve and the vacuum pump in the atomic layer deposition system are used for controlling precursor pulse deposition and inert gas purging conditions in the atomic deposition process, and the film deposition state is improved; the efficiency of purging and removing substances and impurity residues such as a precursor and a reaction product thereof is improved, the problem that the quality of a deposited film is affected by the impurity residues in a reaction system or on the surface of a sample in the film deposition process is avoided, the uniformity and compactness of film deposition and the coverage rate and conformal rate of a film on the surface of a base material hole are improved, the defects of the film are reduced, and the yield is improved. And the method can be applied to a substrate with a high aspect ratio structure to deposit the film, so that the purpose of manufacturing a large-size complicated special-shaped structure device is achieved.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery diaphragm containing modified halloysite nanotubes, a preparation method of the lithium ion battery diaphragm and a lithium ion battery, and the preparation method comprises four steps which are shown in Figure 1 in Figure 1 in Figure 1 in the specification. According to the invention, the sulfonated lithiated halloysite nanotube (sHNT-Li) is introduced into the battery diaphragm, so that the affinity between the diaphragm and an electrolyte is increased, and more sites and channels are provided for lithium ion transmission; and sHNT-Li is utilized to change the diffusion force in the process of a non-solvent phase conversion method, so that the high-temperature-resistant lithium ion battery diaphragm with a microscopic pore channel structure consisting of regular finger-shaped pores and spongy pores is obtained. The diaphragm electrolyte is good in wettability, high in conductivity, good in electrochemical stability and good in lithium dendrite inhibition effect. The battery assembled by the diaphragm shows excellent specific discharge capacity, cycling stability and rate capability, and especially has excellent charge-discharge stability at high temperature; in addition, the electrode polarization degree of the battery is improved.

The invention discloses an antioxidant carbon aerogel material and a preparation method thereof. The method comprises the following steps: sequentially adding a solvent, a boron-containing modifier and a silicon-containing modifier into phenolic resin for esterification reaction; sequentially curing, drying and carbonizing to obtain boron-silicon modified carbon aerogel; depositing a SiC inner coating on the boron-silicon modified carbon aerogel under the assistance of supercritical CO2; a Zr-Si ceramic oxygen barrier layer and a SiO2 sealing and filling layer are sequentially prepared through a sol-gel method, and the carbon aerogel material with the SiC-Zr / Si-SiO2 composite coating is prepared. The invention also provides the aerogel material prepared by the method, the oxidation resistance of the aerogel material is obviously improved, and the aerogel material can be used for preparing a thermal insulation material applied to the field of high-temperature thermal protection.

The invention discloses a flame-retardant eutectic polymer electrolyte based on in-situ polymerization, a preparation method and a solid-state lithium battery, and belongs to the technical field of lithium battery polymer electrolytes.The preparation method comprises the following steps that in the inert gas atmosphere, an amide hydrogen bond donor and alkali metal salt are evenly mixed, and a mixture is obtained; the eutectic electrolyte is obtained by utilizing the interaction of Li-N and Li-O; adding a functional additive, an ester polymer monomer and an initiator into the eutectic electrolyte, and uniformly mixing to obtain a precursor solution; and injecting the precursor solution into a diaphragm in a lithium ion battery to be assembled, sealing, and performing in-situ free radical polymerization reaction to form the flame-retardant eutectic polymer electrolyte, thereby obtaining the solid-state lithium battery of the flame-retardant eutectic polymer electrolyte based on in-situ polymerization. The eutectic polymer electrolyte disclosed by the invention has a flame-retardant property, the safety of the lithium battery is greatly improved, meanwhile, the eutectic polymer electrolyte has high ionic conductivity, the rate capability of the battery is improved, and stable long circulation of the assembled solid-state lithium battery is realized.

The invention discloses an asymmetric solid electrolyte membrane for conducting ions / conducting ions and electrons, a preparation method of the asymmetric solid electrolyte membrane and a solid lithium metal battery. The asymmetric solid-state electrolyte membrane comprises an ion-conducting electrolyte facing the positive electrode side, and comprises an ion-conducting and electron-conducting electrolyte added with an electron-conducting material facing the negative electrode side. The ionic conductivity of the asymmetric solid electrolyte membrane at 30 DEG C is gt; 3mS cm <-1 >. And under the current density of 0.2 mA cm <-2 >, the lithium symmetric battery stably operates for more than 660 hours. The capacity of the solid-state LiFePO4 | | Li battery after 650 times of circulation is kept to be 100 mA h g <-1 > or above under the multiplying power of 0.5 C, and the capacity retention ratio is 70% or above. The asymmetric solid electrolyte membrane disclosed by the invention is high in ionic conductivity, lithium ions are induced to deposit in a membrane for guiding ions and electrons facing a lithium negative electrode side and a negative electrode interface, and the electrochemical performance of a solid lithium metal battery is improved.

The invention relates to the technical field of secondary batteries, in particular to a composite material and a preparation method thereof, a negative electrode current collector, a metal battery and an electric device. The composite material provided by the invention comprises an MXene material, and the MXene material comprises a surface functional group; the silver nanoparticles are grown on the surface of the sheet layer of the MXene material in situ; the modified bacterial cellulose comprises bacterial cellulose and oxygen-containing functional groups modified on the surface of the bacterial cellulose; the modified bacterial cellulose is loaded on the surface of the MXene material; wherein the loading mode of the modified bacterial cellulose at least comprises intermolecular interaction between an oxygen-containing functional group of the modified bacterial cellulose and a surface functional group of the MXene material. The composite material provided by the invention has excellent lithium-loving performance, and can delay the formation of lithium dendrites, so that the electrochemical performance of the metal battery can be improved.

The utility model discloses a rotary gas phase coating intermittent furnace which comprises a hearth, carrier rollers are arranged on the two sides of the hearth, a furnace pipe is arranged in the hearth and rotates on the carrier rollers, and a gas inlet pipe and an exhaust pipe are arranged in the furnace pipe in a penetrating mode. And a raising plate is arranged on the inner wall of the furnace pipe. The lifting plates are arranged on the inner wall of the furnace pipe, so that powder can be promoted to roll over, the powder can be in full and uniform contact with gas-phase lysate, and the uniformity of a coating layer is remarkably improved; by optimizing the design of a gas flow path and a filtering system, the emission of diluent gas and incompletely cracked gas is effectively reduced, and the gas utilization rate is improved, so that the gas consumption and the energy consumption in the whole coating process are reduced, and the production cost is saved. The furnace pipe rotates on the carrier rollers, so that materials are fully turned over and uniformly heated in the hearth, the conditions of material accumulation and non-uniform heat distribution are avoided, and the casting yield and the production efficiency of products are improved.

The invention belongs to the technical field of new energy, particularly relates to the field of zinc ion batteries, and provides a low-cost and environment-friendly aqueous zinc ion battery electrolyte as well as a preparation method and application thereof. The low-cost aqueous zinc ion battery electrolyte comprises soluble zinc salt and an aluminum metal salt additive. The preparation method of the low-cost aqueous zinc ion battery electrolyte comprises the following steps: adding the aluminum metal salt additive into a soluble zinc salt solution, and uniformly stirring; according to the invention, the problems of uncontrollable dendritic crystal growth and irreversible side reaction in the application process of the zinc ion battery in the prior art are solved, so that the electrochemical performance of the zinc ion battery is improved.

The invention provides a reaction chamber and vapor deposition equipment, the reaction chamber comprises a wafer transfer port, a profiling gate valve assembly and a driving assembly, the wafer transfer port is arranged on the side wall of the reaction chamber and is communicated with the reaction chamber; the profiling gate valve assembly is arranged below the wafer conveying opening, the driving assembly is used for driving the profiling gate valve assembly to ascend so as to seal the wafer conveying opening, and the shape of the profiling gate valve assembly is matched with that of the wafer conveying opening. The profiling gate valve assembly is arranged below the wafer conveying opening, the shape of the profiling gate valve assembly is matched with that of the wafer conveying opening, the profiling gate valve assembly is driven by the driving assembly to ascend to conduct profiling sealing on the wafer conveying opening, the size of the reaction cavity is reduced, the plasma flux is larger, and the deposition / sputtering rate is increased; and meanwhile, the inner wall of the chamber is kept in a regular shape by closing the wafer conveying opening, and the plasma is limited in the central area during the process, so that the shape of the plasma can be effectively prevented from inclining during the process, and the deposition or sputtering / etching in the chamber is more uniform.

The invention provides an all-solid-state battery and application thereof. The all-solid-state battery comprises a positive pole piece and a negative pole piece, a protective layer is arranged on the surface of the lithium metal negative electrode; and the solid-state electrolyte membrane is arranged between the positive pole piece and the lithium metal negative pole, and the solid-state electrolyte membrane comprises sulfide solid-state electrolyte. According to the all-solid-state battery and the application thereof provided by the invention, the interface stability between the lithium metal negative electrode and the solid electrolyte can be enhanced, side reactions can be reduced, and the all-solid-state battery with long cycle performance can be obtained by combining the all-solid-state battery with the sulfide solid electrolyte provided by the invention.

The invention relates to a preparation method of a negative electrode material for greatly exposing (101) crystal faces of a traditional commercial zinc foil by adopting a citric acid etching reaction and application of the negative electrode material in water-based zinc ion battery negative electrode protection. And the crystal faces (100) and (002) are etched off by using citric acid, and a large amount of the negative electrode material of the crystal face (101) is exposed. When applied to a negative electrode of a water-based zinc ion battery, the negative electrode material can improve the migration and nucleation capabilities of zinc ions in the negative electrode, can accelerate the dynamic process of rapid and uniform deposition of the zinc ions, and also can improve the stability of the battery. The stability and the dynamic performance of the negative electrode can be greatly improved, zinc ions can achieve rapid migration and uniform deposition on the surface of the negative electrode, and a good inhibition effect on hydrogen evolution and corrosion behaviors is achieved. Research finds that a layer of ZnS solid electrolyte membrane (SEI) protection layer is formed on the surface of the highly exposed Zn (100) negative electrode in the circulation process to prevent direct contact between an exposed crystal face and electrolyte, so that side reactions such as water decomposition and the like are inhibited, interface free energy is reduced, transfer kinetics of zinc ions is promoted, and the service life of the negative electrode is prolonged. And nucleation and deposition of uniform zinc ions are facilitated. The method for protecting the negative electrode of the aqueous zinc ion battery is simple and safe to operate, shows excellent reversibility, and can stabilize the output of the battery in a whole battery in practical application, and the method for protecting the negative electrode of the aqueous zinc ion battery is provided.

The invention discloses a composite current collector, a preparation method thereof and a battery. The composite current collector comprises a base film and a copper layer, wherein the copper layer is positioned on at least one surface of the base film; holes are formed in the surface of the copper layer; the carbon nano tube array is positioned on the surface of the hole; and a Cu2Se nano array, wherein the Cu2Se nano array is located on the surface of the carbon nano tube array. And meanwhile, the composite current collector with the hole structure, the carbon nanotube array and the Cu2Se nano array can remarkably reduce the internal resistance of the battery after circulation, and the lithium precipitation behavior on the surface of the negative electrode is inhibited while the quick charging capacity of the battery is improved.

The present invention belongs to the technical field of solar cell packaging, and specifically discloses an anti-reflection and anti-reflection film on the surface of photovoltaic packaging glass and a preparation method, comprising the following steps: S1, pre-cleaning of the surface of the glass substrate; S2, purging the surface of the glass substrate using a plasma generator; S3, depositing an ALD-TiO2 seed layer on the surface of the glass substrate using atomic layer deposition technology; S4, depositing an ALD-TiO2 / SiO2 composite layer on the upper surface of the ALD-TiO2 seed layer according to a certain thickness ratio. The present invention adopts the above-mentioned anti-reflection and anti-reflection film on the surface of photovoltaic packaging glass and a preparation method, the film has excellent anti-reflection and anti-reflection effect, and the film has high stability, uniformity and durability, effectively reduces light loss, and thus improves photoelectric conversion efficiency.

The invention provides a lithium metal battery modified diaphragm, a preparation method thereof and a lithium metal battery, and relates to the technical field of lithium metal batteries. The modified lithium metal battery diaphragm comprises a lithium metal battery diaphragm and a glassy ZIF-62 layer, the glassy ZIF-62 layer modifies the lithium metal battery diaphragm, and the invention also provides a preparation method of the modified lithium metal battery diaphragm. The invention also provides a lithium metal battery which comprises the lithium metal battery modified diaphragm. The glassy ZIF-62 material disclosed by the invention has a porous structure and no grain boundary, and can regulate and control lithium ions to be uniformly transported and deposited and inhibit the growth of lithium dendrites, so that the technical problem that a lithium metal battery is easy to pierce a diaphragm by the lithium dendrites is solved.

The invention provides a copper current collector based on a SnPc-COF modification layer, a preparation method of the copper current collector and application of the copper current collector in an anode-free lithium metal battery, tin phthalocyanine COF (SnPc-COF) is modified on the copper current collector to serve as an artificial modification layer of the anode-free battery current collector to improve deposition and stripping behaviors of lithium, and the thickness of the modification layer is only 2 microns. A phthalocyanine polymer skeleton is rich in N atoms, has a strong adsorption effect with lithium ions, and can be used as a channel for uniform transmission of the lithium ions; and meanwhile, Sn < 4 + > in phthalocyanine and lithium ions form a Li-Sn alloy during lithium deposition, so that the nuclear potential of lithium is reduced, and uniform deposition of lithium is facilitated.

The invention discloses a high-entropy alloy fiber material of a core-shell structure and a preparation method and application thereof, and belongs to the technical field of alloy material preparation.The method comprises the steps that a buffering agent is dissolved in deionized water to obtain a solution A, the solution A is heated, a complexing agent, additional salt, a reducing agent and soluble metal salt are sequentially added, stirring and dissolving are conducted, and a solution B is obtained; adjusting the pH value of the solution B, and standing at room temperature to obtain an electrolyte; performing ultrasonic cleaning, flushing and drying on the conductive fibers with acetone, ethanol and deionized water respectively; a saturated calomel electrode is used as a reference electrode, a conductive fiber is used as a working electrode, a carbon electrode bar is used as a counter electrode, the three electrodes are immersed in an electrolyte, a constant-potential electro-deposition method is used, electro-deposition is carried out on the surface of the conductive fiber, and the high-entropy alloy fiber is obtained. Uniform electro-deposition of the high-entropy alloy on the surface of the fiber is achieved, and the high-entropy alloy fiber material with excellent conductivity is obtained.

The invention discloses a lithium negative electrode with a multi-layer composite artificial SEI film and a preparation method and application of the lithium negative electrode, and relates to the technical field of lithium batteries. Comprising a porous material, a lithium-loving layer, lithium metal and an inorganic composite material, a lithium-loving layer and lithium metal are sequentially deposited on one side of the porous material, and an inorganic composite material is deposited on the other side of the porous material; the porous material is at least one of a porous carbon material and a porous silicon material; the inorganic composite material is at least five of LiF, Li2O, Li3N, Li2CO3, Li2S, Li10GeP2S12 and Li3PO4, and the inorganic composite material is at least five of Li2CO3, Li2S, Li10GeP2S12 and Li3PO4. According to the invention, the lithium-loving sponge-like porous structure is constructed, the lithium deposition space is increased, the growth of lithium dendrites is effectively inhibited, the SEI layer is prevented from being punctured, and meanwhile, the artificial SEI layer with high stability, excellent ionic conductivity and mechanical strength is constructed by adopting the multifunctional inorganic composite material, so that the cycle performance, the safety and the overall efficiency of the lithium battery are improved.

The application discloses a preparation method of a sodium ion battery hard carbon negative electrode material based on step-by-step synergistic regulation, and comprises the following steps: S1, biomass pretreatment; S2, low-temperature pre-carbonization to obtain biomass pre-carbonized carbon; S3, physical activation: the pre-carbonized carbon is placed in an activation atmosphere to perform medium-temperature activation, and biomass activated carbon is obtained; S4, high-temperature carbonization: the biomass activated carbon is placed in an inert atmosphere to perform high-temperature carbonization, and a hard carbon intermediate is obtained; S5, chemical vapor deposition coating: the hard carbon intermediate is placed in a mixed atmosphere of a coating carbon source and an inert gas to perform chemical vapor deposition coating, and a surface-coated biomass hard carbon negative electrode material is obtained. The application can realize a higher closed pore volume at a milder temperature, and the synergistic regulation pore forming mode of activating and forming pores first and then high-temperature closing pores also avoids the insufficient closed pores caused by single high-temperature treatment.

The invention provides application of polysulfide in a lithium metal battery, the lithium metal battery and a solid-state battery. Wherein the polysulfide is used as an electrolyte of a lithium metal battery or an additive of a polymer electrolyte; the structural general formula of the polysulfide is Li2Sn, and n is greater than 2 and less than or equal to 6. Polysulfide can react with lithium metal to generate Li2S2 / Li2S, so that chemical components of an SE I layer interface are changed, a sulfur-containing inorganic SE I layer is formed on the surface of a negative electrode, and the mechanical property of the SE I layer and the interface stability of electrolyte / electrolyte and metal lithium are improved; and the Li2S2 / Li2S can also reduce the transfer impedance of Li < + >, promote the uniform deposition of lithium ions and inhibit the growth of lithium dendrites. And on the other hand, the high polarizability between Li < + > and the polysulfide anion Sn < 2-> can weaken the combination of a solvent or a polymer substrate and Li < + >, accelerate the migration of Li < + > and promote the diffusion rate of Li < + > in the battery.

The invention discloses a composite modification film, a lithium metal negative electrode and a preparation method of the lithium metal negative electrode. The composite modified film comprises an organic polymer solid electrolyte, an inorganic solid electrolyte and a film-forming agent, and the mass ratio of the organic polymer solid electrolyte to the inorganic solid electrolyte to the film-forming agent is (10%-35%): (10%-35%): (30%-80%). The composite modified film effectively buffers cyclic stress, prevents early mechanical failure of the protective layer, and realizes mechanical durability of the interface protective layer; the immobilized film-forming agent can be slowly released, so that the continuous and stable repair of SEI is realized, the dynamic repair capability of the whole life cycle is provided, and the efficient cycle life of the battery is greatly prolonged; and the electrolyte does not need to depend on a high-concentration liquid additive, dramatic change of electrolyte components in circulation is avoided, the overall chemical stability of the battery is improved, and the stability of an electrolyte system is guaranteed.

The utility model provides a high-melting-point graphite pipe for elemental analysis, which belongs to the technical field of spectral analysis and comprises a circular hollow graphite pipe main body and transverse support parts symmetrically arranged on two sides of the graphite pipe main body, an inner pyrolytic carbon layer is deposited on the inner wall of the graphite pipe, a porous structure is arranged in the inner pyrolytic carbon layer, and an outer compact pyrolytic carbon layer is further deposited on the surface of the inner pyrolytic carbon layer. Through the inner pyrolytic carbon layer and the outer compact pyrolytic carbon layer, in the high-temperature working process, the inner wall pyrolytic carbon layer can be selectively consumed to form a compact glassy carbon film, a self-adaptive protection mechanism enables the graphite tube to still keep stable analysis performance under extreme conditions, reaction or permeation of a detected element and graphite at high temperature is reduced, and the analysis accuracy of the graphite tube is improved. The phenomenon of cross contamination is reduced, the memory effect of the graphite pipe is reduced by 70%, but the memory effect of a traditional pyrolytic graphite pipe can only be reduced by 30-40%, and the graphite pipe is particularly suitable for analysis of high-melting-point elements.