31 results about "Ionic conductance" patented technology

The present application relates to a kind of porous gel electrolyte membrane based on polyvinylidene fluoride and its preparation method, belong to polymer gel electrolyte field.The porous gel electrolyte membrane includes gel electrolyte matrix, inorganic ceramic nano filler, lithium salt electrolyte and lithium salt auxiliary agent.Using phase inversion solidification method, the uniform porous structure is obtained, the adsorption and storage capacity of porous gel electrolyte membrane to electrolyte are improved;Using inorganic ceramic nano filler with high ionic conductance, the ionic conductance and mechanical strength of porous gel electrolyte membrane are enhanced;Using lithium salt added during preparation, the dehydrofluorination reaction of PVdF is inhibited, the stability of slurry is ensured, and by inducing the transition of PVdF matrix from alpha phase to beta phase, the uniform deposition of Li ion is promoted, so as to improve the cycle stability of battery.The preparation method of the present application is simple, easy to control, green and environmentally friendly, can significantly improve the ion transport kinetics and electrochemical stability of lithium ion battery.

The invention provides a compound additive for an electrolyte. A <-> is selected from one of boron-containing inorganic anions or nitrogen-containing organic anions; r1-R4 and X are respectively and independently selected from one of a hydrogen atom, a halogen atom, a C1-C7 alkyl chain or a C1-C7 alkyl chain with a substituent group, a C1-C7 alkoxy chain or a C1-C7 alkoxy chain with a substituent group, a C2-C7 olefin chain or a C2-C7 olefin chain with a substituent group; y is selected from a sulfur atom or an oxygen atom, and A-in the formula 1 and X in the formula 2 respectively contain at least one halogen atom. The electrolyte additive shows high ionic conductivity and good interface mechanical performance, and interface charge transfer impedance is remarkably reduced; meanwhile, the dendritic crystal growth puncture problem at the interface is effectively inhibited, and the cycle life and the safety performance of the battery are improved.

The application provides a kind of composite solid electrolyte particles and its preparation method and application, the composite solid electrolyte particles are core-shell structure, the core layer of the core-shell structure includes inorganic solid electrolyte, the shell layer of the core-shell structure includes organic component, with the inorganic solid electrolyte as core layer, the organic component is coated on its outside as shell layer, can be comprehensive inorganic solid electrolyte and organic component both sides of advantage, reach the effect of playing to one's strengths and avoiding one's weaknesses, so that the composite solid electrolyte particles obtained simultaneously have higher mechanical properties, higher stability and higher ionic conductance characteristics, applied in solid-state battery helps to improve the interface problem between electrolyte and positive and negative electrode in the solid-state battery, and then helps to improve the electrical properties and safety performance of the solid-state battery.

The application discloses a preparation method and application of an oxygen vacancy Li2ZrO3 material and belongs to the field of lithium ion batteries. The oxygen vacancy Li2ZrO3 with uniform structure and high ionic conductivity is successfully prepared by using seaweed fiber, hydrochloric acid, ethanol, zirconium chloride, lithium carbonate and sodium borohydride as raw materials. The seaweed fiber is used as a template, so that the defect of excessively large crystal particle size caused by the traditional solid-phase sintering method is avoided to a certain extent; and the oxygen vacancy is manufactured in a certain concentration of sodium borohydride aqueous solution without changing the structure, so that the operation is simple and practical, and the product is controllable.

The problems or issues faced by typical larger SSE batteries are solved by providing an interface or interfacial layer at least between the anode, which comprises Li or Na, and the solid state electrolyte (SSE). In some other embodiments, an interfacial layer may be provided between the anode, which comprises Li or Na, and the SSE, and an interface or interfacial layer may also be provided between the cathode and the SSE. In at least selected embodiments, aspects or objects, the interfacial layer may act as a shock absorber between a SSE (e.g., a sulfide glass SSE) and an anode material that is soft compared to the SSE (e.g., Li metal). In other embodiments, the interfacial layer may act as a shock absorber between the SSE and a cathode material that is softer than the SSE. In at least certain embodiments, the interfacial layer may improve ionic conductance between the anode and the SSE and / or the SSE and the cathode. In at least certain selected embodiments, the interfacial layer may prevent or deter lithium deposition and dendrite growth at the interface between the anode and the SSE. Interface defects at the interface between the anode and the SSE may allow lithium deposition and dendrite growth. The dendrites may continue to grow through cracks in the SSE causing a short, which is a safety issue. The inventive interfacial layer between the anode and the SSE may prevent or deter this. In at least some embodiments, the interfacial layer may be a porous polymer layer filled with liquid electrolyte and may improve ionic conductance between the anode and the SSE and / or the SSE and the cathode. In certain embodiments, the anode interface or interfacial layer may be a porous polymer layer filled with liquid electrolyte. In some embodiments, the cathode interface or interfacial layer may be a porous polymer layer filled with liquid, gel or polymer electrolyte.

The invention discloses preparation of epoxy group modified zinc ion hydrogel and application of the epoxy group modified zinc ion hydrogel in an efficient hybrid capacitor, and belongs to the technical field of capacitor materials. The problems that an existing zinc ion hydrogel electrolyte is low in specific capacity, poor in mechanical performance, pierced by zinc dendrites and the like are solved. The hydrogel electrolyte takes gelatin and carboxymethyl chitosan as a substrate and polyethylene glycol diglycidyl ether as an additive, and is applied to a high-efficiency hybrid capacitor. According to the invention, interaction between gelatin and carboxymethyl chitosan and an ionic conductivity improvement mechanism are explored. And an epoxy group of polyethylene glycol diglycidyl ether and amino and carboxyl of gelatin are subjected to a ring-opening reaction to form a covalent cross-linked network, so that the ion transmission effect is enhanced, and the mechanical property is improved. According to the invention, blending of three substances is realized only through simple physical stirring, and compared with the most widely used hydrogel electrolyte, the preparation design scheme of the electrolyte greatly improves the specific capacity of a hybrid capacitor.

The invention discloses an all-solid-state electrolyte film, a preparation method thereof and a secondary battery. The all-solid-state electrolyte film comprises a solid electrolyte layer and an ion conduction layer, the solid electrolyte layer contains solid electrolyte, and the ion conduction layer contains lithium salt. According to the all-solid-state electrolyte film provided by the invention, the at least one solid electrolyte layer and the at least one ion conduction layer are compounded, so that the electrolyte is ensured to be uniformly and firmly attached to the diaphragm, the electrolyte is effectively prevented from falling off or being unevenly distributed, and the stability and the reliability of the electrolyte film are improved; meanwhile, the ionic conductivity of the diaphragm is improved by utilizing the ionic conduction layer, so that the prepared all-solid-state electrolyte film has high ionic conduction performance, the electrolyte is uniform and firm, and the mechanical strength and the stability are good. The preparation method of the all-solid-state electrolyte film is simple and controllable, large-scale production is easy to realize, and some defects caused by complex equipment and process in a traditional preparation method are avoided.

The application discloses a kind of coated ternary positive electrode material and its preparation method, battery, which includes ternary positive electrode material core, gradient Al2O3 inner coating layer and LiAlO2 outer modification layer from inside to outside in sequence;Gradient Al2O3 inner coating layer includes inner layer Al2O3 and outer layer Al2O3, the thickness of inner layer Al2O3 is less than the thickness of outer layer Al2O3, and the density of inner layer Al2O3 is greater than the density of outer layer Al2O3.The application solves the problems of large interface impedance of traditional coating material, easy cracking and falling of coating layer in the cycle process, serious structure degradation under high voltage by gradient Al2O3 inner coating layer and outer layer high ionic conductance LiAlO2 outer modification layer, and prepares coated high-nickel ternary positive electrode material with strong interface stability, low impedance and excellent cycle life, effectively improves the electrochemical performance of battery under high-voltage working condition, and is suitable for high-energy-density power battery and energy storage battery field.

This invention discloses a composite solid-state electrolyte, its preparation method, and a battery. The composite solid-state electrolyte comprises a polymer matrix, a sulfide ceramic filler, a main lithium salt, and a nitrile-based lithium salt additive. The nitrile-based lithium salt additive forms an interfacial passivation layer on the surface of the sulfide ceramic filler to suppress interfacial side reactions between the sulfide ceramic filler and the polymer matrix and / or the main lithium salt. This invention maintains the structural integrity of the sulfide ceramic filler, preserving its inherent high ionic conductivity channels, while reducing the interfacial impedance between the organic and inorganic phases, thereby improving the ionic conductivity and interfacial stability of the composite solid-state electrolyte.

The invention discloses an electrolyte film, a preparation method thereof and a solid-state battery. The electrolyte thin film has a three-layer stacked structure, and comprises: a positive electrode stabilizing layer in which an F element is doped in a host material; an O element is doped in a main body material of the fast ion conductive layer; an anode stabilizing layer in which an N element is doped in a host material; wherein the fast ion conductive layer is positioned between the positive electrode stabilizing layer and the negative electrode stabilizing layer; and the main body materials of the positive electrode stabilizing layer, the fast ion conductive layer and the negative electrode stabilizing layer are the same solid halide electrolyte. According to the invention, the same solid halide electrolyte is used as a main body material, a three-layer stacked structure of a positive electrode stable layer, a fast ion conductive layer and a negative electrode stable layer is constructed by doping different elements (F, O and N) in a layered manner, and the homogeneous main body material is utilized, so that side reaction between electrolyte layers can be effectively inhibited, and relatively good contact performance can be maintained; meanwhile, performance complementation is realized through functional doping of each layer, and high ion conductivity and a wide electrochemical window are both considered.

This invention provides a multifunctional halide material, its preparation method, and its application; the multifunctional halide material includes at least one of the following: (I) Li 2‑x M 1‑x A x Cl4;(II) Li 2‑x M' 1‑ x A x Cl4;(II)Li 2‑x M'' 1‑x A x Cl 4‑3x E 3x The multifunctional halide material of this invention possesses both high ionic conductivity and partially reversible delithiation capability, providing additional lithium ions to achieve a lithium replenishment effect.

The invention discloses a preparation method of an electrolyte suitable for a manganese-zinc secondary battery, which comprises the following steps: premixing a solvent, sequentially adding deionized water, ACN, Py, DTA and EG, and stirring; dissolving salt in batches, uniformly adding Zn (OTF) 2 into the reaction kettle in batches, and dissolving to obtain a clear and transparent solution; adding CTAB (cetyltrimethyl ammonium bromide) suspension into the solution and stirring under the synergism of the surfactant; vacuum degassing: removing dissolved oxygen and trace volatile components in the solution in vacuum; and fine filtration and impurity removal: filtering the solution to meet the condition that metal ion impurities are less than or equal to 1ppm, thereby obtaining the high-reversibility electrolyte. According to the electrolyte, on the premise that safety and cost are not sacrificed, nearly 100% Zn electroplating / coulombic stripping efficiency is achieved, dendrite deposition is avoided, the MnO2 positive electrode is high in reversible capacity of 1500 circles or above, hydrogen evolution reaction and electrolyte drying are effectively inhibited, low-temperature long-term stable operation is kept, and the characteristics of low viscosity, high ionic conductivity and non-flammable property are considered.

This invention belongs to the field of battery technology, specifically relating to a dual-network gel electrolyte, its preparation method, and its application. The raw materials of the dual-network gel electrolyte include a first polymer, a second polymer, a metal salt, a plasticizer, a crosslinking agent, and a solvent. The first polymer forms a flexible first network through chemical crosslinking, serving as the main channel for ion transport to ensure high ionic conductivity. Simultaneously, the second polymer is introduced, interpenetrating with the first network through physical or chemical interactions to form a second network. This structure, through synergistic action, preferentially causes reversible damage to the second network to dissipate energy when subjected to external forces (such as zinc dendrite growth stress), thereby protecting the integrity of the main chain structure and ion channels of the first network. Ultimately, the gel achieves excellent mechanical properties such as high toughness and puncture resistance while maintaining high ionic conductivity and excellent capacity retention, solving the problem of mutual constraint between the two in traditional solutions.

A method of preparing an ionic liquid includes the following steps. The halogen-containing compound is reacted with the first compound to form a second compound. The halogen-containing compound includes a halocarbon, a sulfonyl halide, or a combination thereof. The first compound comprises an amine compound with a tertiary amino group, a phosphine compound or a combination of the amine compound and the phosphine compound. The second compound includes a first quaternary ammonium salt, a first quaternary phosphonium salt, or a combination thereof. The second compound is reacted with a lithium salt in a microwave device to form a third compound. The third compound includes a second quaternary ammonium salt, a second quaternary phosphonium salt, or a combination thereof. The anions of the second compound and the third compound are different. The microwave power of the microwave device ranges from 700 watts to 1400 watts. The preparation of the ionic liquid in the microwave device can reduce the time for preparing the ionic liquid. According to the preparation method disclosed by the invention, the ionic liquid with low water content, high ionic conductivity, low viscosity and wide electrochemical stability window can be prepared.

The invention discloses a composite electrostatic spinning fiber diaphragm for a high-stability supercapacitor and a preparation method of the composite electrostatic spinning fiber diaphragm. The diaphragm comprises a high-stability oil-soluble polymer as a fiber skeleton; the high-ionic-conductivity water-soluble polymer is used as an ion transmission enhancing component; and water nanoparticles are not generated in the reaction process with hydrofluoric acid. The polymers are dispersed in a mixed solvent capable of dissolving the two polymers at the same time, electrostatic spinning is carried out, and the graded porous nanofiber membrane is obtained through the phase-induced separation process induced by solvent volatilization. Nanoparticles can be introduced through a deposition loading method or a blending spinning method, and the nanoparticle / polymer composite electrostatic spinning fiber diaphragm with high porosity, high specific surface area and high ionic conductivity is prepared. The composite electrostatic spinning fiber diaphragm has the advantages that the composite electrostatic spinning fiber diaphragm is good in stability under the conditions of high working voltage and high temperature, HF corrosion and gas expansion can be effectively inhibited, and therefore the internal resistance stability, the capacity retention ratio and the cycle life of the supercapacitor are remarkably improved.

The invention discloses a high-specific-energy and high-power battery electrode compound material, an electrode, a device, a preparation method and application. The positive electrode compound material comprises a positive electrode active material, a high-ionic-conductivity solid electrolyte and a high-electron-conductivity additive; the positive electrode active material comprises two or more of an active material A, an active material B and an active material C; the maximum multiplying power of the active material A, the maximum multiplying power of the active material B and the maximum multiplying power of the active material C are smaller than or equal to 2C, larger than 2C and smaller than or equal to 5C and larger than 5C respectively; the negative electrode compound material comprises a negative electrode active material, a high-ionic-conductivity solid electrolyte and a high-electron-conductivity additive; the negative electrode active material comprises two or more of an active material D, an active material E, an active material F and an active material G; the energy storage mechanisms of the active materials D, E, F and G are respectively an alloy type, a conversion type or a conversion-alloy type, a high-pressure embedded type and a low-pressure embedded type. The energy density and the power density of the battery device are remarkably improved, and the battery device has good cycling stability.

The application relates to a preparation method of an integrated flexible solid-state battery with ion and electron double-conducting channels. By combining atomized active particles with carbon nanotube macro-tubular continuum, a flexible thin film electrode is formed through layer-by-layer assembly and is used as an electron three-dimensional framework, and then a solid-state polymer electrolyte is fully combined into the electrode in a permeation and in-situ polymerization mode. Without adding additional binders and conductive agents, the complicated solid-solid interface in the solid-state battery electrode is simplified, the three-dimensional carbon nanotube network framework enables the electrode to have certain mechanical strength and continuous electron conduction path, and the in-situ polymerization of the high ionic conductive electrolyte also solves the ion conduction problem. The novel composite electrode has good interface contact, simple and stable interface structure and continuous charge conduction channel. The application can make the solid-state battery have higher rate performance, high safety, high energy density and flexibility, and the production method is simple and fast, and has the prospect of commercial scale application.

The application belongs to the technical field of lithium ion batteries, and particularly relates to an electrolyte and a battery comprising the electrolyte. The electrolyte provided by the application is added with a first additive imide phosphate compound, which has a lower LUMO and a higher HOMO, is helpful to stable film formation on the positive and negative electrode surfaces, avoids the side reaction between the positive and negative electrode materials and the electrolyte, and generates an interface film rich in N and P. The interface film has high thermodynamic stability and high ionic conductance, is beneficial to improving the high-temperature cycle performance and low-temperature performance of the battery under high voltage, and the phosphate groups in the phosphate groups can capture H· / OH· free radicals in the electrolyte, inhibit the diffusion reaction of free radicals in the battery combustion process. Meanwhile, the phosphate groups can also combine with Lewis acids such as PF5 in the electrolyte, so that the flame retardance of the electrolyte is further improved, and a battery with good thermal stability, i.e., safety performance, is obtained.

The invention discloses an ultraviolet photoelectric sensor based on capillary boundary ion transport and a preparation method and application thereof, and belongs to the technical field of photoelectric sensors. The photoelectric sensor comprises a wide bandgap semiconductor substrate with a capillary boundary, a porous water storage material and an electrode consisting of a non-polarized electrode, the porous water storage material provides a water source for the capillary boundary, the capillary boundary of the substrate is filled with the capillary boundary due to the surface tension of water so that the capillary boundary has ionic conductance, and the non-polarized electrode can rapidly convert ionic current into detectable electronic current. According to the ultraviolet photoelectric sensor provided by the invention, the detection of ultraviolet band light is realized by utilizing the ionic conductance of the ion channel formed by the capillary boundary and the temperature change generated by absorbing the ultraviolet band light by the wide bandgap semiconductor.

This invention discloses an ultraviolet photoelectric sensor based on capillary boundary ion transport, its fabrication method, and its application, belonging to the field of photoelectric sensor technology. The photoelectric sensor includes a wide-bandgap semiconductor substrate with capillary boundaries, a porous water-storing material, and electrodes composed of non-polarized electrodes. The porous water-storing material provides a water source for the capillary boundaries. The capillary boundaries of the substrate possess ionic conductivity due to the surface tension of the water filling the capillary boundaries. The non-polarized electrodes can rapidly convert ion current into detectable electron current. The ultraviolet photoelectric sensor provided by this invention utilizes the ionic conductivity of the ion channels formed by the capillary boundaries and the temperature change caused by the absorption of ultraviolet light by the wide-bandgap semiconductor to achieve the detection of ultraviolet light.

The invention provides an artificial SEI coated negative electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a solution of a composite organic monomer with a catalyst and graphite, carrying out solvothermal reaction, and drying to obtain the artificial SEI coated negative electrode, the composite organic monomer comprises a first organic monomer and a second organic monomer, and the covalent organic polymer coating layer has a polar functional group and an anion acceptor functional group. According to the invention, small-molecule organic monomers are subjected to a polymerization reaction, an artificial SEI-covalent organic polymer is generated on the surface of graphite in situ, functional groups are modified, a polar functional group is utilized to reduce a desolvation energy barrier, an anion acceptor functional group is cooperated to regulate and control a solvation structure and promote lithium salt dissociation, and the dynamic performance and ionic conductance are improved; the negative electrode is prevented from being stripped and cracked due to volume expansion; the artificial SEI prepared by the method is good in structural uniformity and relatively strong in binding force with graphite, and the rate capability and the cycle performance of a negative electrode can be remarkably improved.

The application discloses a kind of composite solid electrolyte film and its preparation method and application, the film is obtained by using electrospinning, electrostatic transfer printing, hot roller and polymer infiltration process preparation ultra-thin high ionic conductance composite solid electrolyte film.In which, electrospinning and hot roller guarantee the uniformity of solid electrolyte film, while effectively reducing the thickness of film;Electrostatic transfer printing and hot roller operation combined way makes inorganic particles uniformly distributed in electrolyte film, improves the mechanical strength of composite electrolyte film, while in electrolyte film contact forms ion transmission path, so that polymer film has high ionic conductance;Infiltration in film self-repairing elastic ion-conducting polymer fills the pore in film, has effective adhesion to ceramic particles, while improving the mechanical properties and ion-conducting property of electrolyte film.

The invention provides a doped material screening method and device, a storage medium, equipment, a sulfide solid electrolyte material and a secondary battery, and the method comprises the steps: obtaining a plurality of candidate doped materials for a sulfide solid electrolyte, calculating the band gap values of the candidate doped materials and the lithium ion conductivity at room temperature, and obtaining the doped material of the sulfide solid electrolyte. The electronic conductivity and ionic conductivity of the material are evaluated, a candidate doping material with excellent electrochemical performance is screened out, and the air stability improving effect of the candidate doping material is evaluated by taking water molecule surface adsorption energy and surface decomposition energy as screening indexes. Therefore, the target doping material capable of effectively improving the air stability is screened out. Therefore, by constructing a set of efficient and systematic sulfide solid electrolyte doping screening process, the screening efficiency is effectively improved, the screening cost is reduced, and the screened doping material has excellent intrinsic electrochemical performance and good air stability.

The invention discloses a surface modified hard carbon material as well as a preparation method and application thereof, and relates to the technical field of sodium-ion battery electrode materials. The surface modified hard carbon material comprises hard carbon particles and a modification layer located on the surfaces of the hard carbon particles, and the modification layer comprises an electronic conductor and an ionic conductor; wherein the electronic conductor comprises cyclized polyacrylonitrile; the ionic conductor comprises a poly-single-ion conductor polymer formed by in-situ copolymerization of an acrylic monomer and a sulfonated single-ion conductor monomer. According to the surface-modified hard carbon material disclosed by the invention, the surfaces of the hard carbon particles are treated by compounding a specific electronic conductor and an ionic conductor to form a modification layer, and the modification layer can play a role of an artificial SEI (Solid Electrolyte Interphase) film, prevent co-intercalation of a solvent and effectively inhibit or reduce surface side reactions; meanwhile, electron and ionic conductance is provided, charge transfer reaction is promoted, and the sodium ion transmission rate is increased. The material has the characteristics of high charge-discharge gram capacity, high initial coulombic efficiency, low polarization and stable rate capability.

The invention discloses an in-situ polyelectrolyte as well as a preparation method and application thereof, belongs to the technical field of in-situ polyelectrolytes, and solves the problem that a solid electrolyte in the prior art cannot have excellent interface contact performance and ionic conductivity at the same time. The in-situ polymerization electrolyte is obtained by a DOL in-situ polymerization mode based on an Sn-Beta molecular sieve initiator. The in-situ polyelectrolyte provided by the invention is applied to the solid-state lithium metal battery, the cycle performance of the in-situ polyelectrolyte for initiating DOL in-situ polymerization is remarkably improved, and the problems of short cycle life and poor cycle performance of the solid-state lithium metal battery are effectively solved.

This invention discloses a method for preparing a surface-passivated, highly stable sulfide electrolyte, comprising the following steps: S1: depositing an ion-conductive seed layer on the surface of sulfide electrolyte particles in an inert atmosphere; S2: coating the surface of the sulfide electrolyte particles with a dynamic passivation layer to obtain coated particles; the dynamic passivation layer forms an ion-conductive polymer layer with a gradient concentration by in-situ initiating a polymerization reaction of monomers containing reversible cross-linked structures on the seed layer, wherein the gradient concentration refers to the continuous increase of the molar fraction of ion-conductive groups along the layer thickness direction; S3: obtaining a surface-passivated, highly stable sulfide electrolyte through spheroidization post-treatment. The preparation method of this invention not only achieves physical-chemical dual shielding against moisture / air erosion, but also endows the particles with self-healing capabilities while simultaneously ensuring high ion conductivity and high mechanical toughness, meeting the stringent requirements of high energy density and long-life all-solid-state batteries.

The invention provides a polymer with a single ion conductor. The polymer comprises at least one of polyoxyanthracene with the single ion conductor and polyimide with micropores and with the single ion conductor. The polyxanthene with the single ion conductor comprises a polyxanthene main chain and a single ion conductor side chain, and the self-microporous polyimide with the single ion conductor comprises a polyimide main chain and a single ion conductor side chain. The polymer with the single ion conductor can be applied to an active particle material in a battery, a protective layer of a battery pole piece and a coating of a diaphragm. The polymer material with the single-ion conductor can realize high ionic conductance through own micropores and single-ion conductor side chains, promote uniform transmission of lithium ions, reduce concentration polarization, do not hinder the development of electrochemical properties of positive and negative electrode materials, and has excellent mechanical properties and processability at the same time.

The invention discloses a pore-forming method of graphite oxide, and belongs to the technical field of graphite oxide. The method comprises the following steps: uniformly mixing graphite oxide with an alkali solution formed by mixing NaOH and KOH according to a molar ratio of (1-2): (1-2), wherein the mass ratio of alkali to graphite oxide is 1: (2-4); then drying the mixed solution, and grinding until the particle size of the material reaches 0.070-0.078 mm; then, the ground material is subjected to high-temperature etching reduction for 0.5-2 h in a tubular furnace at the temperature of 700-900 DEG C; performing ultrasonic oscillation washing with deionized water for 2-3 times; and finally, drying the washed material to obtain the porous redox graphene containing through holes, with the micropore volume of 0.02-0.04 cm < 3 >. G <-1 > and the micropore internal specific surface area of 41.2-47.08 m < 2 >. G <-1 >. Mild pore forming is achieved by controlling key factors influencing pore distribution and size in an alkali etching method, the pore size and pore distribution rate of the obtained product are balanced and reasonable, ionic conductance and electronic conductance are balanced, the rate performance of a lithium ion battery is effectively improved, and the problem that traditional graphene conductive paste is large in ionic steric hindrance is solved.

The application discloses a kind of electrolyte preparation methods suitable for manganese zinc secondary battery, comprising the following steps: solvent premixing, deionized water, ACN, Py, DTA, EG are sequentially added and stirred;Batch dissolving salt, Zn (OTF) 2 is added in batches into reaction kettle, and clear transparent solution is obtained after dissolving;Surfactant cooperation, CTAB suspension is added into solution and stirred;Vacuum degassing, dissolved oxygen and trace volatile components in solution are removed by vacuum;Impurity is removed by filtering, the solution is filtered to meet metal ion impurities≤1ppm, and high reversibility electrolyte is obtained.The electrolyte can realize nearly 100% Zn plating / stripping coulomb efficiency without sacrificing safety and cost, and has no dendritic deposition, MnO2 positive electrode 1500 cycles or more high reversible capacity, effectively inhibits hydrogen evolution reaction and electrolyte dry, maintains low temperature long-term stable operation, and has low viscosity, high ionic conductivity and non-flammable characteristics.

This application provides a negative electrode sheet, its preparation method, and its application. The negative electrode sheet includes a current collector and a negative electrode active layer disposed on the surface of the current collector. The negative electrode active layer includes negative electrode active material particles and a modified inorganic ionic conductor. The modified inorganic ionic conductor includes an inorganic ionic conductor body and a carbon coating layer covering the surface of the inorganic ionic conductor body. The modified inorganic ionic conductor includes one or more of one-dimensional modified inorganic ionic conductor nanowires and two-dimensional modified inorganic ionic conductor nanosheets. The ionic conductivity of the negative electrode active layer gradually increases along the direction from the current collector to the negative electrode active layer. This negative electrode sheet possesses excellent ionic conductivity, electronic conductivity, and high energy density.