496results about How to "Lower internal resistance" patented technology

The invention discloses an adhesive, lithium battery negative electrode slurry, a lithium battery negative electrode and a lithium battery. The adhesive comprises an acrylic copolymer; polymeric monomers of the acrylic copolymer comprise an acrylic monomer, an acrylonitrile monomer, an acrylamide monomer and a selective acrylate monomer; the preparation method of the acrylic acid copolymer comprises the following steps: mixing an acrylic acid monomer with water, adding alkali for neutralization until the neutralization degree is greater than or equal to 50% and less than 100%, then adding an acrylamide monomer and an acrylonitrile monomer, selectively adding an acrylic ester monomer, heating to a reaction temperature in a protective atmosphere, and carrying out a reaction for 2-4 hours to obtain the acrylic acid copolymer. Adding an initiator to initiate an aqueous solution polymerization reaction to generate an acrylic copolymer; practice shows that the binder has higher molecular weight and better electrical performance, when the binder is applied to the negative electrode of the lithium battery, excellent binding power and battery cycle performance can be obtained while the use amount of the binder is reduced, and the binder can be used for preparing the lithium battery, related electrodes and the like.

The invention discloses a preparation method of a low-internal-resistance copper foil for a lithium ion battery, which comprises the following specific steps of: 1, grinding a titanium cathode roller by using a grinding wheel of 50-600 meshes, removing an oxide layer, foreign matter points and the like on the surface of the cathode roller, and grinding by using a grinding wheel of 1000-1500 meshes; 2, the cathode roller falls into an electrolytic bath provided with an anode plate, and copper sulfate electrolyte is introduced into the electrolytic bath; and 4, a direct-current power supply is switched on, the current density of the power supply is 60-70 A / dm < 2 >, copper foil is subjected to electrolytic deposition on the arc-shaped cathode roller surface according to the Faraday principle, then the copper foil is subjected to acid pickling, water washing and passivation, and the lithium battery copper foil with the low internal resistance is obtained. On one hand, the problems of coating wrinkling and tab collapse in the battery preparation process are solved, on the other hand, the safety problem caused by excessive internal resistance and heating in the battery using process of an existing copper foil serving as a current collector is solved, and the performance such as the energy density and the rate characteristic of the battery is improved.

The invention belongs to but not limited to the technical field of electrode materials, and particularly relates to a high-tap-density lithium nickel manganese oxide positive electrode material, a preparation method and a lithium ion battery, the chemical general formula of the high-tap-density lithium nickel manganese oxide positive electrode material is LiNi < 0.5-x > Mn < 1.5-y > M < x > N < y > O < 4 >, 0.1, 0 < = y < lt >; 0.1, M and N are doping elements and comprise one or more of Mg, Co, Al, Zr, W, Sb, Ta and Ti; the material is micron-sized spherical secondary particles formed by stacking and aggregating nano-sized octahedral primary particles, and is uniformly dispersed without agglomeration; the spherical secondary particles are formed by mixing spherical secondary particles with large and small particle size distribution, and the average particle size range of the large particles is 3lt; d < 50lt >; the average particle size range of the small particles is 1lt; d < 50lt >; 2 [mu] m.

The invention belongs to the technical field of magnesium battery electrolytes, and discloses a magnesium battery electrolyte containing an insoluble additive and an application of the magnesium battery electrolyte, the insoluble indium additive is added into the magnesium electrolyte, such as In2O3 nano-particles, In2 (SO4) 3 nano-particles and nano In powder, and the insoluble indium additive is added into the magnesium electrolyte. The non-functionalized sites on the nano-particle cores interact with anions in the magnesium electrolyte to generate a synergistic effect, so that the anions in the electrolyte are fixed, the migration number of Mg < 2 + > and the ion utilization rate are increased, and transmission of magnesium ions is accelerated. The magnesium battery suspension electrolyte is simple in preparation process, low in viscosity and good in stability, the internal resistance of the battery is reduced, the performance of the battery is improved, and the cycle life of the battery is prolonged.

The invention provides a carbon-coated current collector and a preparation method and application thereof. The carbon-coated current collector comprises a current collector base material and a carbon-coated layer on at least one side of the current collector base material; the carbon coating layer comprises a conductive agent, a binder and a cross-linking agent; the binder comprises a polyacrylic acid polymer and polystyrene microspheres. According to the carbon-coated current collector provided by the invention, the cohesive force between the current collector and an electrode active material layer is improved through the synergistic effect of the polyacrylic acid polymer, the polystyrene microspheres and the cross-linking agent, the interface resistance is also reduced, and meanwhile, the electrochemical performance of a pole piece is improved.

The invention provides a cylindrical lithium battery. The sum of the areas of all second holes of a positive collector plate in the cylindrical lithium battery is 0.9-1.5 times of the area of a first hole, a fusing groove is formed in a tail body part of the positive collector plate, and the minimum sectional area S2 of the tail body part at the position of the fusing groove is 45%-65% of the overall sectional area S1 of the tail body part; a negative collector plate in the cylindrical lithium battery is provided with a heightening platform with a flat surface, the diameter D8 of the heightening platform is 28%-38% of the diameter D7 of the negative collector plate, and the height difference H4 between the surface of the heightening platform and the surface of the first side is 18%-30% of the thickness T4 of the negative collector plate. By reasonably designing the necking part, the positive collector plate and the negative collector plate, the cylindrical lithium battery disclosed by the invention is balanced in multiple aspects of liquid injection performance, safety, weldability and the like, and the battery performance can be improved.

The invention provides a cylindrical lithium battery. A first hole and second holes are formed in a plate body part of a positive collector plate in the cylindrical lithium battery, the diameter of each second hole is 25%-35% of the diameter of the plate body part, the sum of the areas of all the second holes is 0.9-1.5 times of the area of the first hole, and a fusing groove is formed in a tail body part of the positive collector plate. The distance between the center position of the fusing groove and the end, away from the disc body part, of the tail body part is 68%-78% of the length of the tail body part, and the minimum sectional area S2 of the tail body part in the fusing groove is 45%-65% of the overall sectional area S1 of the tail body part. According to the cylindrical lithium battery, the disc body part and the tail body part of the positive collector disc are reasonably designed, so that the cylindrical lithium battery is balanced in the aspects of safety, liquid injection performance, weldability and the like.

The invention discloses a lithium battery diaphragm and a preparation method and application thereof, the lithium battery diaphragm comprises a base membrane and a coating on the base membrane, and the coating comprises gamma-phase superfine porous alumina. The method for preparing the lithium battery diaphragm comprises the steps that a base membrane is coated with slurry, drying is conducted, a coating is obtained on the base membrane, the lithium battery diaphragm is obtained, and the slurry comprises water, gamma-phase superfine porous aluminum oxide, an adhesive and a dispersing agent. The gamma-phase superfine porous aluminum oxide has a rich powder pore structure, so that the weight of the diaphragm is reduced, and the lithium battery diaphragm disclosed by the invention has high ion conductivity and high wettability while having high temperature resistance. The high-safety lithium ion battery diaphragm is an important way for improving the safety and the cycling stability of a lithium battery.

The invention relates to the technical field of lithium battery diaphragms, and discloses a water-soluble gel electrolyte, a preparation method thereof, water-based slurry and application. The preparation method of the water-soluble gel electrolyte comprises the following steps: in the presence of an initiator, carrying out first polymerization reaction on methyl methacrylate and N-isopropylacrylamide to obtain an intermediate I; carrying out second polymerization reaction on the polymer solution A and the polymer solution B to obtain an intermediate I; the polymer solution A contains an intermediate I with the concentration of 8-12wt%; the polymer solution B contains neopentyl glycol diglycidyl ether with the concentration of 0.5 to 1.2 weight percent; and carrying out heating treatment on the intermediate I to obtain the water-soluble gel electrolyte. When the water-soluble gel electrolyte is applied to the battery diaphragm, the addition amount of the electrolyte can be reduced during electrolyte injection in a battery cell, and the cost is effectively reduced; battery leakage is reduced, and the safety performance of the battery cell is improved; and the internal resistance can be reduced, and the cycle performance of the battery cell can be improved.

The invention belongs to the technical field of lithium ion batteries, and discloses an amidated polyacrylic acid water-based polymer binder for a silicon-based negative electrode of a lithium ion battery and a preparation method and application of the amidated polyacrylic acid water-based polymer binder for the silicon-based negative electrode of the lithium ion battery. The preparation method comprises the following steps: under a protective atmosphere, sequentially adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, N-hydroxysuccinimide and levodopa, stirring to fully react, carrying out dialysis freeze-drying treatment to obtain a primary product PL, and uniformly mixing the PL with glycerol to obtain the product. According to the binder, a dynamic bond is successfully introduced, the transportation efficiency of lithium ions is improved, a three-dimensional network structure is constructed, adverse stress generated by volume expansion of a SiOx negative electrode material in the charging and discharging process of an electrode can be effectively inhibited, and the SiOx negative electrode shows good cycling stability.

The invention provides an MEMS electrochemical gas sensor and a processing method thereof. The sensor is mainly composed of a breathable substrate structure, a counter electrode, a semi-solid electrolyte layer and a working electrode, the counter electrode, the semi-solid electrolyte layer and the working electrode form a sandwich structure, the thickness of the semi-solid electrolyte layer is 1-30 microns, and the semi-solid electrolyte layer is mainly of a film structure formed by baking a semi-solid electrolyte solution. According to the MEMS electrochemical gas sensor, the semi-solid electrolyte layer is mainly processed based on a semi-solid electrolyte material by adopting processes such as spraying or spin-coating, drying and curing, and the MEMS electrochemical gas sensor is designed and prepared by combining an MEMS process, so that the size of the sensor structure can be 1 mm, the miniaturized and zero-power-consumption work is realized, the gas sensor has a good response signal, and the gas sensor has a good application prospect. The load resistance is in a kiloohm level, and the output current is in a [mu] A level. The sensor can be used for monitoring reducing gases such as carbon monoxide, ethanol, formaldehyde and the like.

The invention discloses a new energy automobile charging management system, and aims to improve the charging efficiency, prolong the service life of a battery and improve the user experience. The system comprises a battery monitoring module, a charging mode management module, an intelligent scheduling module, a remote control module, a safety protection module, a big data analysis module and a billing management module. The battery monitoring module collects data such as battery voltage, current and temperature in real time; the charging mode management module dynamically selects a fast, standard or slow charging mode according to the battery state and the user demand; the intelligent scheduling module optimizes a multi-vehicle charging sequence to realize reasonable resource allocation; the safety protection module provides overvoltage, overcurrent and temperature protection to ensure charging safety; the remote control module enables a user to monitor and adjust the charging state in real time. According to the invention, through intelligent charging management, resource configuration optimization, charging efficiency improvement, safety risk reduction in the charging process and battery life prolonging, convenient charging experience is provided for users.

The invention provides a high-performance all-solid-state electrolytic tank for producing hydrogen by electrolyzing water and a preparation method of the high-performance all-solid-state electrolytic tank. The preparation method mainly comprises the following steps: preparation of electrode powder: preparing (La0. 6Sr0. 4) 0.95 Co0. 2Fe0. 8O3-delta (LSCF) powder by adopting a liquid-phase synthesis method, and preparing MxCe1-xNyO2 powder by adopting a coprecipitation method for an electrode and an isolating layer; preparing a half cell by adopting a co-casting process; an isolating layer and an oxygen electrode are prepared by adopting a silk-screen printing technology, and high-content water vapor is introduced to realize hydrogen production by electrolyzing water. The prepared high-performance all-solid-state electrolytic tank has efficient water electrolysis hydrogen production catalytic activity and Faraday efficiency, can operate at the medium-high temperature of 650-850 DEG C, and can effectively reduce electric energy consumption and improve energy conversion efficiency.

The invention discloses an all-solid-state battery frame structure with a porous structure and double-side supporting thin-layer electrolyte and a preparation method of the all-solid-state battery frame structure. The all-solid-state battery frame structure comprises two layers of porous solid-state electrolyte supporting bodies and a layer of thin-layer solid-state electrolyte, the porous solid electrolyte support bodies are respectively arranged on the upper surface and the lower surface of the thin-layer solid electrolyte as support bodies, and the porous solid electrolyte support bodies have three-dimensional porous structures. According to the all-solid-state battery and the preparation method thereof, the thin-layer solid-state electrolyte of which the two surfaces are supported and homogenous and of a porous solid-state electrolyte structure is prepared through an additive manufacturing technology, and then positive and negative electrode materials are injected into pore channels of a porous solid-state electrolyte supporting body, so that the all-solid-state battery of a 3D structure is constructed, and the thin-layer solid-state electrolyte has low internal resistance; the three-dimensional porous structure support has high reliability; the anode and cathode materials and the solid electrolyte are in three-dimensional contact, and the interface resistance is small.

The present invention discloses a ceramic coated diaphragm and a preparation method thereof, and a secondary battery. The ceramic coated diaphragm comprises a substrate layer and a ceramic coating, wherein the ceramic coating comprises ceramic particles, a binder polymer and an organic high molecular polymer. Under hot pressing conditions of a temperature of 90°C and a pressure of 4MPa, an organic film is formed on the surface of the ceramic coating after hot pressing, wherein the coverage of the organic film is 0-5%, the value-added permeability per unit coating thickness after hot pressing is 0-15s / 100cc, and the peel strength after hot pressing is above 20gf / 15mm. The separator designed by the present invention still has high peel strength and ion permeability after hot pressing, the internal resistance of the battery is reduced, and the cycle and capacity are correspondingly improved.

The invention provides a lithium ion diaphragm and a preparation method thereof and a preparation method of a lithium ion battery, the preparation method of the lithium ion diaphragm comprises the following steps: preparing oily positive electrode coating slurry with butanone as a solvent, and adding an aerogel additive into the oily positive electrode coating slurry; preparing water-based negative electrode coating slurry with ethanol as a solvent, wherein an aerogel additive is added into the water-based negative electrode coating slurry; and respectively coating the oily positive electrode coating slurry and the water-based negative electrode coating on two sides of a base membrane to obtain the lithium ion diaphragm with the oily positive electrode coating, the base membrane and the water-based negative electrode coating arranged in sequence. An aerogel additive is added into the oily positive electrode coating and the water-based negative electrode coating, so that the infiltration effect of the electrolyte is improved, and the high-temperature thermal shrinkage resistance is improved; the oily positive electrode coating slurry adopts an oily system, so that the bonding performance of an oily positive electrode coating and a positive plate is improved, and the aqueous negative electrode coating slurry adopts a hydrophilic system, so that the bonding performance of an aqueous negative electrode coating and a negative plate is improved.

The invention provides a solid electrolyte and a preparation method thereof, a diaphragm, a battery and power-related equipment, and relates to the technical field of lithium batteries. The solid electrolyte is of a core-shell composite structure with LATP as a core and Mg-Sn alloy as a shell wrapping the outer surface of the core. According to the solid electrolyte with the core-shell structure, the LATP serves as the core, the Mg-Sn alloy serves as the shell, air stability is enhanced, Li2CO3 impurities are prevented from being generated, high ionic conductivity and a wide electrochemical window are kept, and stability and mechanical strength are improved. The corrosion resistance and tear resistance of the alloy enhance the safety of the battery, and the aluminum element in the LATP improves the strength of the alloy and optimizes the performance and charge-discharge efficiency of the battery.

The invention discloses a water-based binder for a lithium ion battery as well as a preparation method and application of the water-based binder. The binder is obtained by polymerizing raw materials comprising the following components: a) 20wt%-45wt% of at least one of olefinic bond type unsaturated carboxylic acid or olefinic bond type unsaturated carboxylic acid anhydride; b) 20 wt% to 45 wt% of an ethylenic bond type unsaturated nitrile monomer; c) 5 wt%-30 wt% of an ethylenic bond type unsaturated hydrophilic monomer which does not contain carboxyl; d) 10 wt% to 40 wt% of an ethylenic bond type unsaturated hydrophobic monomer; and e) 0.15 wt%-1 wt% of a crosslinking monomer. The binder provided by the invention is applied to the field of lithium ion batteries, and can improve the processing performance of a negative pole piece and the cycle performance of the battery.

The invention provides a cylindrical lithium battery. A necking groove is formed in a shell in the cylindrical lithium battery, the height H2 of the necking groove is 0.1%-1% of the height H1 of the shell, and the depth H3 of the necking groove in the radial direction is 5%-10% of the outer diameter D1 of the shell; the sum of the areas of all second holes of a positive collector plate in the cylindrical lithium battery is 0.9-1.5 times of the area of a first hole, a fusing groove is formed in a tail body part of the positive collector plate, and the distance between the center position of the fusing groove and the end, away from a plate body part, of the tail body part is 68-78% of the length of the tail body part; the minimum sectional area S2 of the tail body part at the position of the fusing groove is 45%-65% of the overall sectional area S1 of the tail body part; the negative collector plate in the cylindrical lithium battery is provided with a heightening platform with a flat surface, and the flatness of the surface of the heightening platform is 0.01-0.05 mm. By reasonably designing the necking part, the positive collector plate and the negative collector plate, the cylindrical lithium battery disclosed by the invention is balanced in multiple aspects of liquid injection performance, safety, weldability and the like, and the battery performance can be improved.

The invention discloses an environment-friendly long-life crosslinked polyethylene insulated overhead cable, and relates to the technical field of cables, the cable comprises a polyethylene insulating layer, a sliding ring groove plate is embedded in the inner side of the polyethylene insulating layer, an annular sliding groove is formed in the inner side of the sliding ring groove plate, an upper rolling column is slidably mounted on the inner side of the annular sliding groove, and a lower rolling column is slidably mounted on the inner side of the upper rolling column. The device is scientific and reasonable in structure and safe and convenient to use, the heat dissipation speed is increased when heat dissipation is needed, a certain amount of heat is generated for heat preservation in cold days, the heat dissipation efficiency is improved, the heat dissipation efficiency is improved, the heat dissipation efficiency is improved, and the service life of the device is prolonged. And then the temperature of the cable is increased in cold days, so that the polyethylene insulating layer can be prevented from being embrittled and damaged, the service life of the cable is prolonged, the cable is prevented from being damaged, and the stable proceeding of power transmission is further ensured.

The invention discloses a battery monomer, and belongs to the technical field of batteries, the battery monomer comprises a battery cell assembly, the battery cell assembly comprises a stacked core body, a first tab and a second tab, the first tab and the second tab are respectively arranged at one end of the stacked core body in a first direction, and the first tab and the second tab are arranged at an interval in a second direction; the first tab is provided with a first end connected with the laminated core body, the second tab is provided with a second end connected with the laminated core body, and the distance D between the first end and the second end is greater than or equal to 5mm and less than or equal to 20mm in the second direction; and in the second direction, the width of the first end is a, the width of the second end is b, the width of the laminated core body is T, and a / T is greater than or equal to 0.35 and less than or equal to 0.48, and / or b / T is greater than or equal to 0.35 and less than or equal to 0.48. According to the invention, the overcurrent area of the first tab and the second tab is increased, the internal resistance of the joints of the first tab, the second tab and the stack core body is reduced, and the charging and discharging energy efficiency of the battery monomer is improved.

The invention provides an electron-ion mixed conductor solid electrolyte material as well as a preparation method and application thereof, and is characterized in that the electron-ion mixed conductor solid electrolyte material is compounded by embedding a sulfide solid electrolyte into a metal organic framework material serving as a framework, the electronic conductivity of the metal organic framework material is greater than 10 <-2 > S / cm. A metal organic framework material is used as a carrier of a sulfide solid electrolyte and is compounded with the sulfide solid electrolyte to form a mixed conductive ion-electron structure, and the mixed conductive ion-electron structure is fully mixed with a positive electrode active substance, so that the interface contact loss between the materials is favorably reduced, and the metal organic framework material can play a role of a conductive agent in the composite positive electrode; therefore, the use amount of the conductive agent in the composite positive electrode is reduced, and even the conductive agent is not needed, so that the use amount of auxiliary materials is reduced, the polarization of a battery cell is reduced, and the utilization rate of positive electrode active substances is improved.

The invention relates to the technical field of lithium ion batteries, in particular to an in-situ dispersed lithium ion battery positive electrode slurry and a preparation method thereof.The preparation method comprises the steps that firstly, a binder and a solvent are fully dissolved to form a glue solution, polyacrylic acid and a sodium source are introduced to be dissolved for in-situ dispersion to obtain a dispersion stock solution, then a dispersing agent B is added, stirring is conducted, and the in-situ dispersed lithium ion battery positive electrode slurry is obtained; the preparation method comprises the following steps: adding a dispersing agent into a reaction kettle, carrying out hydrothermal reaction at a certain temperature for a certain time to obtain a dispersion final solution, adding a conductive agent and an active material into the dispersion final solution, carrying out high-speed granulation stirring, adding a solvent after stirring, adjusting to a proper slurry viscosity, defoaming, and screening to finally prepare the highly dispersed lithium ion battery positive electrode slurry. According to the lithium ion battery positive electrode slurry prepared by the method, the dispersity and stability of the slurry can be greatly improved, the uniformity of the interior of a pole piece is realized, the conductivity of the pole piece is improved, the internal resistance of the battery is reduced, the excellent rate capability and cycle performance of the battery are further realized, and the discharge capability of the battery in a low-temperature environment is improved.

The invention belongs to the technical field of nanomaterials, and discloses a nanoflower-shaped FeOOH / NiFe-LDH composite material as well as a preparation method and application of the nanoflower-shaped FeOOH / NiFe-LDH composite material. The preparation method comprises the following steps: taking urea as a pH regulator, uniformly dispersing the urea, soluble nickel salt and soluble ferric iron salt in water, then adding a morphology control agent NH4F, and uniformly mixing to obtain a mixed solution; the mixed solution is subjected to a homogeneous reaction under the stirring condition, and after the reaction is finished, the nanoflower-shaped FeOOH / NiFe-LDH composite material is obtained. The preparation method is low in reaction temperature, short in reaction time and simple, the prepared composite material is of a three-dimensional structure, low in impedance and large in specific surface area, and the multi-phase composite material is multiple in charge transfer paths, high in electron migration rate, high in stability and excellent in electrochemical performance.

The invention belongs to the field of lithium ion battery materials, and discloses an organic composite solid electrolyte which comprises a negative electrode side solid electrolyte and a second solid electrolyte attached to one side surface of the negative electrode side solid electrolyte, the negative electrode side solid electrolyte comprises a first lithium salt, PTCDA (3, 4, 9, 10-tetracarboxylic anhydride) and a polymer; and the second solid electrolyte comprises a second lithium salt and a polymer. In the circulation process, PTCDA in the solid electrolyte spontaneously reacts with the lithium metal to form an organic SEI film, so that the interface contact between the lithium metal and the solid electrolyte is improved. And PTCDA molecules contain a large number of carbonyl groups, so that lithium ion binding sites are increased, the conductivity of lithium ions in the electrolyte is increased, the internal resistance of the battery is reduced, and the cycling stability of the battery is improved.

According to the negative electrode plate provided by the invention, the pure silicon particles are used as the negative electrode active material, and the thickness of the coating layer of the negative electrode plate is controlled by controlling the mass ratio of the pure silicon particles in the negative electrode silicon-based active material and adjusting the surface density and the compaction density of the negative electrode plate, so that the energy density and the conductivity of the negative electrode plate are improved. The invention also provides a preparation method of the negative pole piece, and the preparation of the negative pole piece is realized by preferably selecting the conductive agent and the binder and controlling the viscosity and the solid content of the slurry. The invention also provides a cylindrical battery, by adopting the negative pole piece, the preparation of various types of high-energy density cylindrical batteries can be realized by changing the width and length of the positive and negative pole pieces, and meanwhile, the battery also has excellent rate capability.

The invention discloses a positive electrode active material, a secondary battery and a power utilization device, and belongs to the technical field of batteries, the positive electrode active material comprises a core material and a carbon coating layer arranged on the outer surface of the core material, the core material comprises a positive electrode material and boron oxide, the boron oxide is at least partially distributed among pores of the positive electrode material, and meanwhile, the positive electrode material contains the manganese-iron-lithium oxide with specific doping elements, so that the lithium ion secondary battery has stable electrochemical capability in a high-temperature and high-voltage state, and therefore, the cycling stability can be effectively improved, the internal resistance can be reduced, gas production can be inhibited, and the service life of the lithium ion secondary battery can be prolonged. The volume expansion rate is reduced.

The invention provides a novel all-vanadium redox flow battery without an electrode frame, which comprises two end plates on the outer side, two insulating plates and two collector plates which are sequentially arranged between the two end plates, and at least one integrated bipolar plate arranged between the two collector plates, a pair of electrodes and a proton exchange membrane are sequentially arranged on two sides of the integrated bipolar plate; the integrated bipolar plate comprises a bipolar plate body and electrolyte flow channel areas arranged in the middles of the two side faces of the bipolar plate body respectively, electrode grooves used for embedding electrodes are formed in the two side faces of the integrated bipolar plate, and the two electrodes are arranged on the outer side of the positive electrolyte flow channel area and the outer side of the negative electrolyte flow channel area respectively. The electrode frame, the electrode tank, the bipolar plate and the reaction flow channel region of the flow battery are integrally formed, the integration level is high, the bipolar plate is high in conductivity and excellent in mechanical property, and the electric pile performance of the flow battery is improved.

The invention discloses a preparation method of a self-assembled cellulose diaphragm, a membrane prepared by the self-assembled cellulose diaphragm and application of the self-assembled cellulose diaphragm. The preparation method comprises the following steps: mixing a solvent solution containing cellulose and zinc salt with a solvent solution containing a microporous material, ultrasonically crushing, and forming a membrane to obtain the self-assembled cellulose diaphragm, the cellulose is selected from cellulose nanofibers and / or cellulose nanowires; after the cellulose and the microporous material are uniformly dispersed in the solution, a film-forming base solution of the self-assembled diaphragm can be formed without adding any binder in the film-forming process, and the self-assembled diaphragm has a good film-forming effect. The composite diaphragm provides an effective channel, promotes the transmission of zinc ions in the battery, has smaller internal resistance than a traditional diaphragm, has high electrolyte preservation rate, is smaller than the traditional diaphragm in thickness, and can improve the energy density and cycle performance of the battery. The preparation process of the diaphragm is simple, the reaction condition is mild, the preparation period is short, and the diaphragm is suitable for large-scale industrial production and commercial application.

The invention discloses a biomass porous carbon electrode material, a preparation method thereof and application of the biomass porous carbon electrode material in a room-temperature sodium-sulfur battery, and belongs to the technical field of preparation of a room-temperature sodium-sulfur battery positive electrode material.The biomass waste is pretreated and then pre-carbonized, then a pore-forming agent is added for mixing, ball milling and activation, a hydrochloric acid solution is added, heating and stirring are conducted, and cleaning and suction filtration are conducted to obtain the biomass porous carbon electrode material. And mixing the biomass porous carbon material with sulfur powder, and carrying out heat treatment so as to obtain the biomass porous carbon electrode material. The positive electrode is activated by a chemical reagent, has a multi-stage pore structure and inhibits the volume expansion of the positive electrode in a physical mode. According to the present invention, the large pores are beneficial to the passing of electrolyte ions, the mesopores can ensure the high sulfur loading amount, and the small pores can provide the extremely high specific surface area and the large adsorption volume, such that the shuttle effect caused by the conversion of the polysulfide in the room temperature sodium-sulfur battery can be effectively solved, and the actual specific capacity and the rate capability of the room temperature sodium-sulfur battery can be improved;