2810 results about "Electronic conductivity" patented technology

The invention belongs to the technical field of design and preparation of solid electrolyte materials, and particularly relates to a LiBH4-based composite solid electrolyte material and a preparation method thereof.The LiBH4-based composite solid electrolyte material is obtained by performing high-energy ball milling on a mixture of LiBH4 and one or two metal halides MX2 in a certain molar ratio in an argon atmosphere; m is Mg, Zn, Ni or Bi; x is F, Cl, Br or I. According to the LiBH4 composite solid electrolyte prepared by the preparation method disclosed by the invention, the ionic conductivity at room temperature is improved to 10 <-4 > S cm <-1 > or above, and the ion diffusion activation energy is only 0.16 eV; the process is simple, the preparation time is short, the repeatability is high, no pollution is caused to the environment, and the industrial production requirement is met, so that the all-solid-state lithium ion battery electrolyte is expected to realize commercialized application.

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention belongs to the technical field of electrochemical energy storage, and provides an immersed energy storage system and a thermal management method thereof, the immersed energy storage system comprises a sealed cabin, a battery module, an immersion liquid, a liquid cooling unit, a cooling liquid, a liquid cooling pipeline, a temperature sensor, an electrical device and a thermal management controller; the non-conductive immersion liquid with the conductivity smaller than 10 <-6 > S / m and the flash point larger than 200 DEG C is adopted to completely wrap the battery module, it is ensured that the energy storage battery cells are located in the same temperature physical environment, the temperature consistency of the system is greatly improved, the problem of uneven heat dissipation is fundamentally solved, the service life of the energy storage cabinet is directly prolonged, the immersion liquid has the flame-retardant characteristic, and the service life of the energy storage cabinet is prolonged. Thermal runaway of a battery cell can be effectively restrained, fire and explosion risks are reduced from the source, system operation safety is guaranteed, meanwhile, the type selection standard of cooling liquid is defined, the design of a sealed cabin is optimized, the heat exchange efficiency is improved through a double-circulation branch of a liquid cooling unit, the key bottleneck of an immersed cooling technology in energy storage system integration is thoroughly solved, and the energy storage system integration efficiency is improved. And full landing of technical advantages is realized.

The invention provides a fast-charging type solid-state lithium battery alloy negative electrode material, a preparation method and a solid-state lithium battery, and relates to the technical field of lithium batteries. The alloy negative electrode material comprises the following element components in percentage by mass: 30-38% of indium In, 30-35% of tin Sn, 28-35% of bismuth Bi and 0-1.5% of doping elements, crystal phases formed by the alloy negative electrode material of the fast-charging type solid-state lithium battery at least comprise two crystal phases, namely InSn4 and InBi. The alloy negative electrode material has relatively high surface capacity, lithium ion conductivity and lithium ion diffusion coefficient, lithium dendrites do not grow on a negative electrode when a solid-state lithium battery assembled by the alloy negative electrode material is charged and discharged under high current density, and the battery is high in energy density and long in cycle life.

The invention discloses a composite sulfide solid-state electrolyte and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The composite sulfide solid electrolyte comprises sulfide solid electrolyte particles and nano ion conductor particles which are stable to water vapor, wherein the nano ion conductor particles are uniformly distributed on the surfaces and gaps of the sulfide solid electrolyte particles to form a composite structure. Therefore, through the composite structure that the nano ion conductor particles are uniformly distributed on the surfaces of the sulfide particles and in the gaps, the surface coverage of the sulfide solid electrolyte can be increased, the hydrolysis reaction rate can be reduced, and the sulfide solid electrolyte is well protected while the reduction amplitude of the lithium ion conductivity is reduced; the stability to air is improved; and the electrochemical stability is also improved. In addition, the method is simple in process, has good mass production capacity, and has high application value for actual production.

The invention provides an electrolyte for quickly charging a sodium-ion battery without a negative electrode. The electrolyte comprises a sodium salt, a solvent and an additive. According to the electrolyte, metal oxide nanoparticles are introduced as a first additive, and a second additive is supplemented, so that rapid desolvation of sodium ions on an electrode interface and improvement of the ionic conductivity of an electrolyte body are realized at the same time, and compact and dendrite-free sodium deposition under high current density is realized. The negative-electrode-free sodium-ion battery prepared from the electrolyte can be quickly charged, and good cycling stability and high capacity retention ratio can be maintained, so that the use requirements of people can be met.

The invention discloses a flexible piezoresistive sensor and a preparation method and application thereof, the flexible piezoresistive sensor comprises an upper layer flexible conductive member, the upper layer flexible conductive member comprises an upper layer flexible substrate and an upper layer conductive layer, one surface of the upper layer flexible substrate is provided with a microstructure formed by sand paper reverse molding, and the upper layer conductive layer is embedded in the surface of the microstructure; the lower-layer flexible conductive member comprises a lower-layer flexible substrate, a lower-layer conductive layer and an elastic conductive layer; the lower-layer flexible substrate is provided with an arc-shaped stripe array microstructure; the elastic conductive layer includes a polymer matrix and a conductive filler dispersed therein. Through the double-gradient design of the gradient conductivity and the gradient structure, the core contradiction that a traditional flexible piezoresistive sensor is difficult to consider high sensitivity and wide linear range at the same time is successfully solved by utilizing the deep coupling and synergistic effect of the conductivity gradient and the structure gradient, and synchronous improvement of the sensitivity and the linear range is realized.

The invention relates to the technical field of lithium battery electrolytes, in particular to a preparation method of a polyether-based solid electrolyte and application of the polyether-based solid electrolyte in electrochemical devices such as lithium metal batteries. The polyether-based solid electrolyte material comprises a porous polymer skeleton, a cyclic ether monomer, a copper-based compound, a lithium salt and a plasticizing additive. The preparation method comprises the following steps: loading a copper-based compound into a porous polymer skeleton, adding cyclic ether, lithium salt and the like to carry out in-situ ring opening polymerization, cooperatively constructing a polyether-porous polymer skeleton three-dimensional network structure, and improving the mechanical strength of the electrolyte. Wherein the copper-based compound widens the chain spacing of the porous polymer, and is convenient for the cyclic ether monomer to penetrate into the skeleton; meanwhile, the in-situ ring-opening polymerization of the cyclic ether promotes the close contact between the electrolyte and an electrode, the interface impedance is reduced, and the ionic conductivity is improved. The polyether-based solid electrolyte prepared by the invention can promote stable circulation of a lithium metal battery.

The invention relates to a lithium battery parameter identification method based on a physical information neural network, and belongs to the field of battery health and management. The method comprises the following steps: firstly, acquiring a data set, receiving battery charging data through a battery management system, then preprocessing the data, calculating label capacity through an ampere-hour integral method, and performing an experiment by using an electrochemical workstation to obtain specific electrochemical parameter data. The method comprises the steps that firstly, a single-particle model with an electrolyte is constructed, then an encoder is used for extracting multi-scale time characteristics of battery data, a decoder is introduced to accurately capture key information of the battery data, and finally, the single-particle model with the electrolyte is fused with a whole neural network model to construct a physical information neural network, so that the identification precision and efficiency of the whole framework on internal parameters of the lithium battery are improved. Experimental results show that the method can effectively identify six battery internal key parameters including a solid phase diffusion coefficient, electrical resistivity of an EI film, liquid phase lithium ion concentration, an electrolyte diffusion coefficient, effective electrolyte conductivity and transfer number.

The invention discloses a reverse osmosis membrane concentration polarization layer thickness prediction method and device based on electrical impedance tomography, and relates to the technical field of membrane process nondestructive monitoring, and the method comprises the following steps: constructing a simulation model based on an electrode array membrane filtration sensor; virtual media with different conductivities are arranged on the surface of the membrane, a simulation conductivity image is reconstructed through a conjugate gradient least square algorithm and a sensitivity matrix, and a neural network is improved through known conductivity training; and reconstructing an actually measured conductivity image by an actually measured boundary voltage data set, predicting a membrane surface conductivity estimated value by using the trained improved neural network, and performing concentration polarization layer thickness mapping. A conductivity image with a conductivity label is generated through numerical simulation, so that the problem that the thickness of the concentration polarization layer is difficult to calibrate is solved, then a neural network is improved through training so that the truth value of the conductivity can be predicted according to the conductivity image, and interpretable mapping of the thickness of the concentration polarization layer is carried out in combination with a membrane mass transfer theory. The thickness of the concentration polarization layer can be subjected to online lossless quantitative detection.

The invention discloses a preparation method of a solid-state electrolyte based on chemical bonding of a silane coupling agent and a sulfide solid-state electrolyte and a preparation method of a solid-state lithium battery. A halogen ion competitive adsorption effect of a first electrolyte is cooperated with a compact siloxane network formed by the silane coupling agent; the sulfide solid electrolyte is effectively inhibited from reacting with moisture in air, electrochemical performance attenuation is delayed, the first electrolyte reacts with lithium metal to generate a stable SEI layer to inhibit dendritic crystal growth, and a wide electrochemical stable window of the second electrolyte can reduce oxygenolysis reaction with a high-voltage positive electrode, so that the electrochemical performance is improved. Chemical bonding is formed between amino groups of the silane coupling agent and lithium metal, interface contact is optimized, meanwhile, the interface ion transfer efficiency is improved through the high ionic conductivity of the second electrolyte, and the interface impedance is reduced; the defects of poor ionic conductivity and poor service life caused by poor air stability and electrochemical stability of the electrolyte in the prior art are overcome.

The invention belongs to the technical field of battery materials, and mainly relates to a pre-oxidized asphalt synergistically coated double-layer hard carbon negative electrode material, a preparation method thereof and a sodium ion battery. The method comprises the following steps: crushing and sieving a biomass raw material, and then carrying out pre-carbonization treatment to obtain a pre-carbonized precursor; carrying out ball milling and sieving on the pre-carbonized precursor, carrying out acid pickling, and drying to obtain a purified precursor; stirring and mixing the purified precursor and asphalt, and performing heating pre-oxidation synergistic coating treatment by adopting an oxygen concentration gradient control method to obtain a pre-oxidized asphalt synergistic coating material; and performing high-temperature carbonization treatment on the pre-oxidized asphalt synergetic coating material to obtain the pre-oxidized asphalt synergetic coating double-layer hard carbon negative electrode material. The pre-oxidized asphalt synergistically coated double-layer hard carbon negative electrode material has a low specific surface area and a stable coating layer structure, and can be used as a sodium ion battery negative electrode material to effectively improve the conductivity of a sodium ion battery, improve the first coulombic efficiency and rate capability and prolong the cycle life of the battery.

The invention relates to the field of lithium manganate positive electrode materials, in particular to a lithium manganate positive electrode material and a preparation method thereof, a positive electrode plate and a battery, which are used for solving the problems of Jahn-Teller distortion of Mn < 3 + >, Mn dissolution and low conductivity in circulation. Lithium carbonate, manganous-manganic oxide, potassium carbonate, aluminum nitrate and absolute ethyl alcohol are subjected to ball milling and then sintered to obtain K / Al co-doped lithium manganate powder, then the K / Al co-doped lithium manganate powder is coated with an acetylferrocene / diphenylamine polymer, finally, the K / Al co-doped lithium manganate powder is coated with an AlF3 (at) CeF3 suspension, and finally the lithium manganate positive electrode material is obtained. According to the lithium manganate positive electrode material, the electronic conductivity is greatly improved, the rate capability is improved, and the cycling stability is improved; and the material has excellent cycling stability and rate capability.

The invention discloses a sodium ion sulfide solid electrolyte with enhanced stability, the chemical composition formula of the solid electrolyte is Na3Sb1-xAsxS4-ySey, x and y are respectively molar ratios of As and Se, x is more than or equal to 0.1 and less than or equal to 0.5, y is more than or equal to 0.1 and less than or equal to 0.4, the solid electrolyte has a cubic phase crystal structure similar to Na3SbS4 and belongs to a space group, the side length of a cell is a = b = c = 7.19309, and the volume of the cell is V = 374.9457336; in the crystal structure, Sb and As are mixed to occupy the peak and center equivalent position 2a of a cubic unit cell; s and Se are mixed to occupy a 24g position, Na ions are filled in gaps of unit cells, Na1 occupies a 6b position, Na2 occupies a 2b position, and a covalent bond network is formed by the position occupied by the mixture of S and Se and the position occupied by the mixture of Sb and As. The solid electrolyte is low in cost, the ionic conductivity of the solid electrolyte is 10 <-3 > S / cm magnitude, and the solid electrolyte has excellent cycle performance and air stability.

This invention relates to a biomass-based gel electrolyte membrane, its preparation method, and its application. The method includes preparing regenerated cellulose using a sol-gel method, adding sodium alginate and zinc chloride solution, and rapidly constructing a biomass-based composite gel electrolyte with a dual-network structure through metal ion coordination crosslinking. The biomass-based gel electrolyte membrane is obtained by adsorbing an aqueous electrolyte onto a gel membrane with a dual-network structure. This gel electrolyte membrane is then assembled with a zinc anode and a vanadium pentoxide cathode to obtain a zinc-ion battery. This invention features a simple method, readily available and inexpensive raw materials, easy product molding, convenient operation and control, and is conducive to industrial production. The prepared composite gel electrolyte membrane has a dual-network structure, exhibiting good stability, liquid retention capacity, and ionic conductivity, and demonstrates excellent cycle capacity and lifespan when applied to aqueous zinc-ion batteries.

The invention provides a terahertz echo wall mode waveguide on a light control chip, which comprises an echo wall mode micro-ring, a straight waveguide and a conical coupling waveguide which are integrated on the same substrate, and a solid-state laser source positioned above the micro-ring. And the conductivity and the inherent loss of the high-resistance silicon micro-ring are dynamically changed through the photon-generated carrier effect, so that switching of an echo wall mode among an over-coupling state, a critical coupling state and an under-coupling state is accurately and continuously regulated and controlled. According to the invention, based on an active regulation and control mechanism of a photoconductive effect, large-depth and high-speed dynamic control of terahertz signal transmission amplitude and phase can be realized, the bottleneck of low integration level and limited modulation performance of an existing terahertz regulation and control device is solved, and a key technical scheme is provided for realizing a high-performance on-chip terahertz switch, an attenuator and a modulator.

The invention provides a halide composite solid electrolyte, a preparation method thereof, a positive plate and a battery. The solid electrolyte comprises a porous SiO2 skeleton and a halide solid electrolyte, the SiO2 skeleton has a continuous and intercommunicated pore channel structure, the halide solid electrolyte partially fills the pore channel structure of SiO2 through in-situ growth, and the halide solid electrolyte partially wraps the surface of the SiO2 skeleton through in-situ growth. The interface of the SiO2 skeleton and the halide solid electrolyte comprises a transition layer; the mass content of the SiO2 skeleton is 1-30wt%, and the specific surface area is 50-500m < 2 > / g. The SiO2 skeleton can effectively reduce the contact area between halide electrolyte in the pore channel and environmental moisture, and delay the diffusion and permeation of moisture into the material. The high-bond-energy Si-O bond and the transition layer further inhibit hydrolysis of the halide electrolyte. The halide electrolyte forms a continuous ion transmission path in a continuous pore channel of SiO2, so that high ionic conductivity is guaranteed.

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention belongs to the technical field of water source heat pump units, and particularly relates to a self-checking method of a vortex type water source heat pump unit, which comprises the following steps: 1, controlling a bypass valve to open according to a set period and driving a sampling pump through a controller in a detection part on the water source heat pump unit, and introducing a water source sample into a sampling tank in the detection part from a main pipeline, and the controller is electrically connected with a built-in control module of the detection component through an RS485 bus so as to transmit instructions. According to the self-checking method of the vortex type water source heat pump unit, by arranging the self-checking method of the vortex type water source heat pump unit, water quality self-checking can be conducted on the water source heat pump unit automatically and regularly, the water quality is detected through a pH sensor, a turbidimeter, a conductivity meter and a metal ion detector, the weight is dynamically adjusted through water sources, a segmented normalization algorithm is adopted, and the self-checking accuracy of the vortex type water source heat pump unit is improved. And the misjudgment problem of adapting to all water sources according to a fixed standard is avoided.

The invention discloses a composite lithium supplement additive and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The composite lithium supplement additive provided by the invention comprises a lithium-rich lithium ferrite core; the conductive carbon coating layer and the pentafluoropropionamide coating layer are sequentially coated outside the lithium-rich lithium ferrite inner core from inside to outside, so as to form a core-shell structure. The composite lithium supplement additive prepared by the invention forms a three-dimensional interpenetrating electron transport network, significantly improves the material conductivity, optimizes the charge transfer dynamics, can effectively isolate lithium-rich lithium ferrite from contacting H2O and CO2 in the air, significantly reduces the generation of surface residual alkali, can adapt to the volume expansion of lithium-rich lithium ferrite in the charge-discharge process, and improves the lithium supplement efficiency. And material structure damage caused by interface stress is reduced, so that the cycling stability of the lithium ion battery is greatly improved, the service life of the lithium ion battery is greatly prolonged, and the material has a wide application prospect in the lithium ion battery.

The invention discloses a preparation method of a sulfide solid electrolyte, and relates to the field of solid-state batteries, the preparation method comprises the following steps: preparing Li2S-coated LiCl core-shell nanoparticles, and carrying out airflow collision grinding on the Li2S-coated LiCl core-shell nanoparticles and P2S5 nanopowder to obtain composite powder; the composite powder is placed in a reaction furnace for heating deposition, then heating crystallization is carried out, and Li6PS5Cl nanoparticles are obtained; the Li6PS5Cl nanoparticles are placed in a ball milling tank to be treated, then annealing treatment is conducted, and the sulfide solid electrolyte is obtained after treatment is completed. Through combination of the core-shell structure precursor and the vapor deposition technology, the core contradiction that nanocrystallization and high ionic conductivity are difficult to consider at the same time in the sulfide solid electrolyte field is effectively solved, and the problems of interface contact defects caused by micron-sized particles and crystal defects caused by mechanical refinement in a traditional process are effectively solved; the problem is solved through construction of Li2S-coated LiCl core-shell nanoparticles and activation treatment of airflow on collision and grinding.

The invention provides a lithium-rich manganese-based positive electrode material, a preparation method thereof and a battery. The lithium-rich manganese-based positive electrode material comprises an inner core and a solid electrolyte coating layer coating the outer part of the inner core, oxygen vacancies exist in the solid electrolyte coating layer, the inner core comprises a lithium-rich manganese-based matrix material, and doping elements are doped in the lithium-rich manganese-based matrix material; and the doping elements comprise any one or a combination of at least two of a Ti element, an Al element, a La element, an Nb element or a Ge element. The lithium-rich manganese-based positive electrode material provided by the invention comprises the core and the solid electrolyte coating layer, and the solid electrolyte coating layer can be used for enriching oxygen vacancies and inhibiting irreversible oxygen loss on one hand, and providing a rapid channel for lithium ion transmission with high lithium ion conductivity on the other hand, so that the prepared battery has relatively high electrochemical performance; in addition, the inner core is doped with doping elements existing in inner core crystal lattices in the form of ions, the layered structure can be stabilized, phase change can be inhibited, and the cycling stability of the battery is improved.

The invention discloses a niobium-doped and carbon nanotube continuously coated lithium iron nickel phosphate material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The niobium source and the phosphorus source are added step by step, the concentration gradient distribution of the niobium element in the material is realized, and niobium is preferentially doped in the [100] crystal orientation through three-section temperature control sintering, so that the bulk phase conductivity and the lithium ion mobility are remarkably improved, and the capacity loss caused by excessive doping is avoided while the lattice structure is stabilized. In addition, the carbon nanotubes and the nitrogen-containing carbon source have a synergistic effect, Li-N-C covalent bonds are formed on the surface of the material, the interface stability is enhanced, the interface side reaction is effectively inhibited, and the surface conductivity is improved. According to the method, through double modification of doping and coating, the problems of low conductivity and poor cycling stability of the lithium iron nickel phosphate material are successfully solved, and the final product shows excellent rate capability and long cycle life.

The invention belongs to the technical field of solid-state lithium metal batteries. The invention provides a mixed ion / electron conductor intermediate layer with a directional double-layer structure. The mixed ion / electron conductor intermediate layer comprises a titanium nitride nanotube array and lithium ion conductor layers deposited on the inner surface and the upper surface of the titanium nitride nanotube array. The lithium ion conductor layer on the upper layer of the directional double-layer structure mixed ion / electron conductor intermediate layer has high lithium ion conductivity and low electron conductivity, and can inhibit nucleation of lithium on an electrolyte interface and growth of lithium dendrites; the lower layer can guide lithium to realize uniform deposition and stripping in the nanotubes through a creep mechanism, and stress is effectively released, so that the electrochemical performance of the battery is improved; the creep path of lithium deposition stripping can be shortened, and the diffusion and transmission capability of lithium ions can be remarkably enhanced by matching with a lithium ion conductor with a high lithium ion diffusion rate; the middle layer is thin and controllable in thickness, the overall energy density of the battery is hardly reduced, and the application prospect is good.

The invention relates to a positive electrode material and a preparation method thereof, a sodium-ion battery positive plate and a sodium-ion battery. The positive electrode material comprises a mixed sodium iron phosphate matrix and a double-carbon heterostructure penetrating through the inside and the outside of the mixed sodium iron phosphate matrix, the general formula of the mixed sodium iron phosphate matrix is Na4Fe3 (PO4) 2P2O7, and the double-carbon heterostructure comprises a conductive carbon material and an organic carbon source precursor pyrolysis product, the mixed sodium iron phosphate matrix is foamed by gas generated by pyrolysis of the organic carbon source precursor to form a three-dimensional porous structure, and the surfaces of particles of the mixed sodium iron phosphate matrix are coated with pyrolysis products of the organic carbon source precursor; the conductive carbon material penetrates through the three-dimensional porous structure and is connected with the mixed sodium ferric phosphate matrix particles coated with the organic carbon source precursor pyrolysis product, so that a three-dimensional porous interconnected conductive network is formed. According to the positive electrode material, the sodium storage specific capacity can be ensured, the electronic conductivity of the NFPP material is effectively improved, and the rate capability and the cycling stability of the NFPP material are improved.

The invention discloses a tellurium-doped copper sulfide-based nano composite material with a core-shell structure as well as a preparation method and application thereof, and belongs to the technical field of zinc ion battery negative electrode materials. The method comprises the following steps: dissolving a copper source, a sulfur source, a carbon source and a tellurium source in a mixed solution of deionized water and ethylene glycol, uniformly stirring and mixing, carrying out hydrothermal reaction and centrifugal cleaning, collecting a precipitation product, and carrying out vacuum drying; and carrying out calcination reaction to obtain the tellurium-doped copper sulfide-based nano composite material with the core-shell structure. The inner-layer microspheres are microspheres formed by stacking tellurium-doped copper sulfide flower-shaped nanosheets; and the outer coating layer is a carbon layer. Through the synergistic effect of tellurium doping and carbon coating, the electron conduction and the structural stability of the material are effectively enhanced, and the cycle performance and the rate capability of the aqueous zinc ion battery are remarkably improved. As a negative electrode of the zinc ion battery, the material can effectively improve cyclic reversibility, has remarkable reversible capacity, improves the performance of the zinc ion battery, and is suitable for industrial production and large-scale energy storage.

The invention provides a wide-temperature-range high-specific-energy fluorinated gel electrolyte and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. Comprising a lithium salt, a (methyl) acrylate monomer and a fluorinated sulfonate plasticizer, the molar concentration of the lithium salt relative to the total volume of the fluorinated sulfonate plasticizer and the (methyl) acrylate monomer is 2-5 mol / L, and the volume ratio of the (methyl) acrylate monomer to the fluorinated sulfonate plasticizer is (2-4): (8-6). The gel electrolyte not only has the characteristics that the ionic conductivity at room temperature exceeds 2 mS / cm and the electrochemical window exceeds 5 V, but also has good stability matched with a high-voltage positive electrode and stability matched with a lithium metal negative electrode and a silicon carbon negative electrode, and shows good cycle performance in a wide temperature range (-20 to 60 DEG C).

The invention discloses a rigid-flexible coupling all-solid-state battery suitable for a high-expansion electrode and a preparation method thereof.The all-solid-state battery comprises a composite positive electrode, an all-polymer electrolyte layer and a composite negative electrode which are sequentially assembled, and in-situ polymerization polymer electrolyte networks are constructed in the composite positive electrode and the composite negative electrode; the all-polymer electrolyte layer comprises a polymer electrolyte network constructed by in-situ polymerization, a lithium salt, a plasticizer and a fast ion conductor ceramic filler; polymer electrolyte networks in the composite positive electrode, the composite negative electrode and the all-polymer electrolyte layer are of a double-network structure consisting of a rigid polymer skeleton and a flexible cross-linked polymer network. Through the integrated structural design of the all-polymer electrolyte and the composite electrode, the ionic conductivity, the interface stability, the cycle performance and the safety performance are synergistically improved, and the requirements of high energy density and high-safety energy storage are met.

The invention discloses a silicon-carbon composite material and a preparation method thereof, and belongs to the field of lithium batteries. The preparation method specifically comprises the following process steps: pre-carbonization of a biomass material, gas activation and pickling purification, nano silicon vapor deposition and primary vapor carbon coating, mixed sintering with an elastomer filling material, and secondary vapor carbon coating. A large number of mesoporous channels exist in the obtained silicon-carbon composite material, nanometer silicon crystal particles are deposited in the channels, the surfaces of the particles are coated with a primary carbon coating layer, nanometer silicon can be effectively prevented from being oxidized, then an elastomer filling material is molten in the sintering process to enter reserved spaces of the channels, remaining gaps are filled, and the mechanical property of the composite material is improved. According to the preparation method, the volume expansion effect of nanometer silicon in the lithiation process can be effectively buffered, the mechanical strength can be enhanced, finally, through secondary gas-phase carbon coating, a continuous carbon layer is formed on particles, volume expansion can be relieved, and the electronic conductivity and the cycling stability of the material can be improved.

The invention discloses a lithium-stable ultrathin flexible solid electrolyte film based on a high-dielectric oxide skeleton, and belongs to the technical field of solid electrolyte. The ultra-thin flexible solid electrolyte film comprises a framework, a dielectric layer and a flexible layer, wherein the framework is composed of a high-dielectric oxide; and the polymer electrolyte is formed by in-situ curing, covers the surface of the framework and is filled in the pores of the framework. Benefited from the high dielectric oxide skeleton, the ultrathin flexible solid electrolyte film has high stability to lithium, high ionic conductivity, high ionic transference number and long cycle life, and is very suitable for preparing a solid-state battery with high volume and / or high mass energy density.