195results about "Composite electrolytes" patented technology

The invention discloses a biosynthetic bacterial cellulose-based solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolytes. The solid electrolyte is prepared by taking modified bacterial cellulose prepared by fermenting acetobacter xylinum, rhizobium, pseudomonas, azospirillum, alcaligenes and other bacteria as a substrate, introducing a low-molecular-weight polymer to regulate and control the arrangement of cellulose molecular chains to serve as a conductive ion framework, and then compounding a conductive ion high-molecular-weight polymer and a lithium salt. According to the invention, cellulose molecular chains are modified by modified glucose, and a network structure is regulated and controlled by a low-molecular-weight polymer, so that the problems of small spacing, lack of ion coordination sites and weak ion transmission capability of pure cellulose molecular chains are effectively solved, the ionic conductivity of the prepared solid electrolyte can reach 10 <-4 > S cm <-1 >, the electrochemical window width reaches 5V, and the solid electrolyte has a good application prospect. The material can tolerate high critical current density, is suitable for various positive electrode materials, and is suitable for high-voltage and long-cycle-life energy storage devices.

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 discloses a composite solid electrolyte and a preparation method and application thereof, and belongs to the technical field of solid lithium batteries. The composite solid electrolyte comprises a polymer matrix, a lithium salt and a lithium ion modified ionic metal organic framework (MOF) material. The metal center of the ion-conducting MOF material can be selected from Zr, Ti, Hf and the like, and the organic ligand can be selected from organic acids containing sulfydryl, sulfo groups and the like. The MOF material can effectively inhibit crystallization of a polymer matrix and increase the proportion of an amorphous region, Lewis acid sites on the surface of the MOF material can promote dissociation of lithium salt, and a lithium ion coordination channel formed in the MOF material can provide an extra rapid transmission path for lithium ions. When the electrolyte is applied to the solid-state lithium battery, the growth of lithium dendrites can be effectively inhibited, and the rate capability, the cycling stability and the safety of the battery can be remarkably improved.

The invention discloses a composite solid electrolyte layer, a preparation method and application, the composite solid electrolyte layer comprises a porous membrane laminated on a negative pole piece, and pores in the porous membrane and gaps between the porous membrane and the negative pole piece are filled with in-situ generated polymers. Inorganic solid electrolyte is also dispersed in the porous membrane, and lithium salt is dispersed in the polymer and the porous membrane. The composite solid electrolyte layer is obtained through in-situ polymerization of a polymer in pores in the porous membrane and gaps between the porous membrane and the negative electrode plate, and a novel interface structure with the electrode-electrolyte integration characteristic is constructed. By adopting a collaborative optimization strategy of a polymer matrix and inorganic filler double-crosslinking network system and an interface stable layer, the volume effect problem of a silicon-based negative electrode, the electrolyte interface impedance problem and the battery safety problem can be solved at the same time, so that the cycling stability and the rate capability of the lithium ion battery are remarkably improved.

The embodiment of the invention discloses a preparation method of a solid electrolyte membrane and the solid electrolyte membrane. The preparation method of the solid electrolyte membrane comprises the following steps: providing a composite fiber solution, a thermoplastic elastomer solution, a solid electrolyte matrix and a positive electrode material; performing coaxial electrostatic spinning treatment on the composite fiber solution and the thermoplastic elastomer solution to obtain a fiber adhesive; carrying out ball milling treatment on the fiber adhesive, the solid electrolyte matrix and the positive electrode material to obtain a fibration mixture; and carrying out hot rolling treatment on the fiberized mixture to obtain the solid electrolyte membrane. According to the preparation method provided by the invention, the fiber adhesive prepared from the composite fiber and the thermoplastic elastomer, the solid electrolyte matrix and the positive electrode material are subjected to ball milling and hot rolling treatment, so that the interface contact between the cathode and the electrolyte is optimized, the interface impedance is reduced, the cyclic stress is relieved, and the generation of interface cracks is inhibited; the prepared solid electrolyte membrane is high in ionic conductivity and stable in structure.

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.

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.

The invention provides a composite solid electrolyte membrane, a preparation method thereof and a secondary battery. The composite solid-state electrolyte membrane comprises a modified pyrochlore type oxide solid-state electrolyte, a polymer matrix and a lithium salt, and the modified pyrochlore type oxide solid-state electrolyte comprises a pyrochlore type oxide solid-state electrolyte and a polymer coating layer coating the surface of the pyrochlore type oxide solid-state electrolyte. The polymer coating layer and the pyrochlore type oxide solid electrolyte are connected through a covalent bond, the polymer coating layer is formed by in-situ polymerization of a polymer monomer on the surface of the pyrochlore type oxide solid electrolyte, and the polymer monomer is selected from a monomer with a trifluoroacetamide functional group and / or a monomer with a carbamate functional group. The composite solid electrolyte membrane provided by the invention has excellent lithium ion conductivity.

The present application relates to an organic-inorganic composite solid electrolyte and a preparation method thereof, which is prepared by compounding an oxide solid electrolyte, an unsaturated polymer crosslinked in situ on the surface of the oxide solid electrolyte, and a polar organic solvent, so as to prepare an organic-inorganic composite solid electrolyte with higher room-temperature ionic conductivity and a wider electrochemical window. The composite solid electrolyte prepared by the present application has a room-temperature ionic conductivity of 0.1 mS / cm or higher, an electrochemical window of greater than 4.5 V, and an alkali metal cation transference number of greater than 0.9. In addition, the composite solid electrolyte is easy to be formed into a film, and the composite solid electrolyte film prepared has a thin thickness. A solid-state alkali metal battery assembled with the electrolyte film has good interface stability with the positive and negative electrodes, and can inhibit the growth of alkali metal dendrites, thereby significantly improving the performance of the battery.

To provide a solid electrolyte for an anode-free metal battery cell.SOLUTION: The present invention relates to a solid-state electrolyte (SSE) for an anode-free metal battery cell, wherein the metal is an alkali metal, an alkaline earth metal or a metal of group Ib, IIb or IIIa of the periodic table, the SSE comprising a non-aqueous solvent, a metal salt of an alkali metal, an alkaline earth metal or a metal of group Ib, IIb or IIIa of the periodic table, an aluminum-based halogenated compound AlXn, and a bis (fluorosulfonyl) imide anion, wherein X is a halogen atom and n is from 1 to 6. The invention further relates to a method of making such an SSE, the method comprising preparing a liquid precursor and exposing the liquid precursor to a temperature between 20 °C and 80 °C to solidify the liquid precursor, thereby obtaining a solid electrolyte.SELECTED DRAWING: Figure 1

According to the solid-state battery and the preparation method of the composite solid-state electrolyte of the solid-state battery, the surface of an electrolyte membrane is covered with a layer of first composite material, Li2O-B2O3 is stable to high voltage, B2O3 can effectively'capture 'or'fix' active hydrogen generated by decomposition of LiBH4 and prevent the active hydrogen from damaging an interface of a positive plate, a LiBH4 derivative phase is soft in texture, and the composite solid-state electrolyte of the solid-state battery can be used for a lithium ion battery. LiBH4 is added into the solid electrolyte, so that gaps between positive electrode particles and the solid electrolyte can be filled, the interface impedance is greatly reduced, and LiBH4 has high ionic conductivity and can maintain relatively good lithium conductivity; a layer of second composite material covers the surface of the composite solid electrolyte, and Li4PS4 provides high conductivity, has a very wide electrochemical stable window, can be directly and stably contacted with a high-voltage positive electrode, effectively inhibits release of positive electrode active oxygen and interface side reaction, and can effectively block diffusion of transition metal ions in the positive electrode to the electrolyte side; and moreover, the two layers of composite materials are used as bridging layers by introducing Li2S, so that the firm connection of the two composite layers is realized, and the impedance is reduced.

The invention provides a composite solid electrolyte, an all-solid-state positive pole piece and a preparation method and application thereof, the composite solid electrolyte is characterized by comprising a plurality of composite solid electrolyte particles, and each composite solid electrolyte particle at least comprises a conductive agent, an all-solid-state positive pole piece and an all-solid-state positive pole piece, and the solid electrolyte partially or completely wraps the conductive agent, and a network structure is formed between the conductive agent and the solid electrolyte. According to the composite solid electrolyte, the all-solid-state positive pole piece and the preparation method and application of the all-solid-state positive pole piece, a three-dimensional continuous conductive network can be constructed, and the electron and ion conduction efficiency can be improved, so that the rate capability and the cycle performance of an all-solid-state battery can be improved.

The invention discloses a metal oxide modified fiber material as well as a preparation method and application thereof. The preparation method comprises the following steps: stirring and dissolving tetraethoxysilane, tungsten chloride, ethanol and hydrochloric acid to form a uniform solution; mixing and dissolving polyvinylpyrrolidone, N, N-dimethylformamide and dimethyl sulfoxide to form another solution; mixing the solutions to prepare a spinning solution, and performing electrostatic spinning to obtain fibers; and dissolving a polyvinylidene fluoride-hexafluoropropylene copolymer and lithium bis (fluorosulfonyl) imide in N-methyl pyrrolidone to form a homogeneous solution, adding the fibers, stirring and mixing, casting to form a film, blade-coating the film to a predetermined thickness, and performing vacuum drying to obtain the target composite electrolyte. The method comprises the following steps: preparing a silicon dioxide nanofiber loaded tungsten oxide nanowire with a high length-diameter ratio through electrostatic spinning, and compounding the silicon dioxide nanofiber loaded tungsten oxide nanowire with a polyvinylidene fluoride-hexafluoropropylene copolymer matrix. The method is simple, convenient, efficient and low in cost, the prepared solid electrolyte is high in stability, the long cycle performance of the battery is remarkably improved, and an important basis is provided for optimizing polyvinylidene fluoride-hexafluoropropylene copolymer based electrolyte and developing a high-performance all-solid-state lithium ion battery.

The invention relates to the technical field of energy storage, in particular to a gel electrolyte, a preparation method thereof and a battery. The gel electrolyte comprises a porous skeleton structure and lithium salt arranged in gaps of the porous skeleton structure, the porous skeleton structure comprises a skeleton material, a cross-linking group and a chemical bond; wherein the framework material and the cross-linking group are covalently cross-linked through a chemical bond; the framework material comprises cellulose and lignin; the cross-linking group comprises at least one of an aldehyde group, an epoxy group and a hydroxyl group; the chemical bond comprises at least one of an ether bond and an ester bond. The gel electrolyte provided by the invention has significantly improved ionic conductivity and mechanical properties.

The application discloses a nanofiber and piezoelectric polymer composite solid-state electrolyte membrane and a preparation method and a secondary battery thereof, relates to the technical field of batteries, and the raw materials of the solid-state electrolyte membrane include nanofibers and a piezoelectric polymer, the raw materials of the piezoelectric polymer include a piezoelectric polymer, a zinc salt and an ionic liquid; the nanofibers are used in the form of a nanofiber membrane as a framework, and the piezoelectric polymer is arranged on the nanofiber membrane. The preparation method comprises the following steps: preparing a spinning liquid by using a polymer material, performing spinning treatment, and obtaining a nanofiber membrane; dissolving the piezoelectric polymer, the zinc salt and the ionic liquid, uniformly laying the piezoelectric polymer, the zinc salt and the ionic liquid on the nanofiber membrane, and drying, and the solid-state electrolyte membrane is obtained. The secondary battery comprises the solid-state electrolyte membrane. The nanofiber reinforced solid-state electrolyte membrane realizes uniform distribution of current and electric field, provides ideal conditions for zinc deposition, the piezoelectric polymer is injected as an ion transmission medium, the zinc salt and the ionic liquid are introduced, and the ionic conductivity is improved.

The invention discloses a solid-state electrolyte precursor, a solid-state electrolyte and a solid-state lithium battery, and relates to the technical field of solid-state electrolytes. The solid electrolyte precursor is processed to form a solid electrolyte containing a thiourea structural unit, and the thiourea structural unit contains an N-H group capable of participating in hydrogen bond formation; and the ionic conductivity of the solid electrolyte at 25 DEG C is not less than 1.6 * 10 <-4 > S.cm <-1 >. According to the solid electrolyte formed by the solid electrolyte precursor, the solid electrolyte comprises a thiourea structural unit, a polymer network structure with the modified inorganic filler as a connection point is formed, the interfacial compatibility of an inorganic material and an organic material in the solid electrolyte is improved, a continuous conductive path is formed in the solid electrolyte, and the conductivity of the solid electrolyte is improved. Therefore, the ionic conductivity of the solid electrolyte is improved.

The application discloses a composite solid electrolyte material with introduced ion filler, a preparation method and application, and preparation raw materials include a polymer electrolyte, a lithium salt, a filler and a solvent, and the preparation method is as follows: (1) the filler is uniformly mixed with monomers, a free radical polymerization initiator, azobisisobutyronitrile, is added to obtain a composite; (2) the composite is uniformly mixed with the lithium salt in a solvent to obtain a mixture; and (3) the mixture is dried into a film to obtain the composite solid electrolyte material. Before a polymer matrix is formed, inorganic filler particles are preferentially introduced, uniformly mixed, and then heated to initiate polymerization to form a polymer-inorganic composite, and then the polymer-inorganic composite is dissolved into a film, a lithium ion fast transmission channel is constructed, lithium ion transmission efficiency is improved, the ionic conductivity of the polymer electrolyte itself is significantly improved, the polymer electrolyte can replace a separator and an electrolyte in a traditional battery at room temperature, and a full solid-state battery can be cycled at a wide temperature.

A battery cell (20) comprises - an anode (31) which contains lithium metal, - a cathode (32), - an asymmetric composite electrolyte (40) with a first layer (41) and with a second layer (42), wherein the first layer (41) is in contact with the anode (31), wherein the second layer (42) is in contact with the cathode (32), wherein the first layer (41) comprises a lithium phosphorus sulfur chloride and a poly(ethylene oxide) as components, and wherein the second layer (42) comprises a lithium aluminum titanium phosphate and a poly(ethylene oxide) as components.

The application relates to the field of battery material preparation, and discloses a zwitterionic cellulose-based solid electrolyte membrane, a preparation method and application thereof, the preparation method comprises the following steps: S1: mixing ZCNF and copper sulfate in an aqueous solution to form a mixture, then adding a lithium salt into the mixture to react, so as to obtain a ZCNF-CuSO4-containing precursor; wherein the ZCNF is a zwitterionic cellulose nanofiber; S2: after the ZCNF-CuSO4-containing precursor is dried, ion exchange reaction is carried out with a lithium salt electrolyte, so as to obtain a Li-ZCNF-CuSO4-containing cellulose-based material. The zwitterionic cellulose-based solid electrolyte membrane has high ionic conductivity and lithium ion transference number in a normal temperature environment of 30-70 DEG C, and the application of a solid-state lithium metal battery in a normal temperature scene is realized.

The present invention relates to a method for preparing a solid electrolyte, the method comprising mixing a lithium source with a sulfur source and a phosphorus and sulfur containing compound to form a composite material, and then heating the composite material to a melting point of the phosphorus and sulfur containing compound to form a solid electrolyte material. The invention also relates to a solid electrolyte material prepared by the method wherein the solid electrolyte material has the formula I: Li (7-y-z) PS (6-y-z) X (y) W (z) wherein X and W are independently selected from the group consisting of F, Cl, Br and I; wherein y and z each range independently from 0 to 2; and wherein y + z ranges from 0 to 2.

The present invention provides a solid electrolyte material that can suppress a decrease in filling efficiency. [Solution] A solid electrolyte material comprising a sulfide solid electrolyte containing lithium, sulfur, and phosphorus, and an organic compound, wherein the organic compound has two or more benzene rings, and the melting point of the organic compound is 82°C or lower.

The invention discloses a preparation method of a solid electrolyte membrane for an arc brain-computer interface battery, and belongs to the field of battery solid electrolytes, and the preparation process comprises six steps of raw material preparation, slurry preparation, tape casting, arc pre-forming, hot-press shaping and post-treatment. Li7La3Zr2O12 powder, polyethylene oxide, LiTFSI, propylene carbonate and absolute ethyl alcohol are adopted as raw materials, and a finished product is prepared through pretreatment, ball milling, curtain coating, arc drying, hot pressing and finishing testing. The prepared solid electrolyte membrane has no liquid leakage risk and is high in safety; a brain bone groove structure is adapted through an arc-shaped pre-forming process; the oxide and the polymer synergistically improve the ionic conductivity and the energy density; no strong magnetic resonance component exists, and the electromagnetic compatibility is good. According to the two provided embodiments, flexibility and high energy density are emphasized respectively, different brain-computer interface scene requirements can be met, and a guarantee is provided for stable operation of implantable brain-computer interface equipment.

The invention relates to a high-voltage-resistant organic-inorganic composite solid electrolyte, a preparation method and a solid-state lithium metal battery. The high-voltage-resistant organic-inorganic composite solid electrolyte membrane comprises an ionic liquid, an inorganic filler, a lithium salt and a polymer matrix, the ionic liquid is imidazole ionic liquid containing tetrafluoroboric acid anions (), and in the high-pressure-resistant organic-inorganic composite solid electrolyte membrane, the content of the ionic liquid is 5wt%-25wt%; the content of the inorganic filler is 10 wt%-25 wt% of the polymer matrix; the molar ratio of lithium ions in the lithium salt to oxygen in the polymer matrix is between 1: 12 and 1: 24. Through the synergistic effect of the added ionic liquid and inorganic filler, the room-temperature ionic conductivity and high-voltage stability of the solid electrolyte are improved, and the room-temperature performance of the solid-state lithium metal battery under high working voltage is improved.

The application relates to a sulfide solid electrolyte and a preparation method and application thereof, and the composition is 70R2S-(30-x)SiS2-xM a O b , wherein R is Li or Na, x is 0.1-10, M a O b is a metal oxide, and a and b are natural numbers. The sulfide solid electrolyte of the application improves ion conductivity by adding a metal oxide as a network modifier in a Li2S-SiS2 sulfide solid electrolyte system. The solid electrolyte of the application has the characteristics of electrochemical stability and environmental friendliness, and provides a solid electrolyte material for a full solid-state secondary battery which has higher charge-discharge capacity while inhibiting the generation of hydrogen sulfide and can be charged and discharged at a higher current density.

The invention relates to the technical field of batteries, and particularly discloses a preparation method and application of a composite electrolyte based on LATP skeleton support, and the composite electrolyte comprises an LATP skeleton, a polymer electrolyte and a lithium salt. The LATP framework is a ceramic material, the mechanical strength is high, the chemical stability is good, and the lithium dendrite inhibiting capacity of the electrolyte is effectively improved through a ceramic mechanical network prepared through suction filtration. The composite electrolyte is a polymer electrolyte with excellent flexibility, so that the interface impedance between the ceramic electrolyte and an electrode is reduced, and the cycling stability of the battery is improved. Preparation and application of the framework-supported ceramic / polymer composite electrolyte provide a design thought for development of solid-state lithium metal batteries with high safety, excellent rate capability and cycle performance.

A composite active material has an electrode active material and a coating layer. The electrode active material includes an Si element. The coating layer coats a surface of the electrode active material. The coating layer contains a hydride solid electrolyte.

The present invention relates to a solid electrolyte having a composition represented by chemical formula 1 below, a method for preparing same, and an all-solid state battery comprising same. [Chemical formula 1] Li11-(5a+3b+c+2x)PaGabS5-(c+x)X(1+c), where X is one or more selected from F, Cl, Br, and I, and 5.0<5a+3b+c+2x<6.0, 0<b≤0.5, 0≤c<0.7, 0<c+x<1, 1≤a+b≤1.5.

The application provides an inorganic compound electrolyte thin film and a preparation method thereof and a solid-state battery formed by the inorganic compound electrolyte thin film, and belongs to the technical field of battery electrolytes. The compound electrolyte thin film comprises a sulfide or halide solid-state electrolyte framework and a polymer electrolyte filled in the framework. By applying a specific pore-forming agent, controlling the particle size of the sulfide or halide and the pore-forming agent and the volume ratio of the sulfide or halide and the pore-forming agent, a self-supporting sulfide or halide solid-state electrolyte framework with uniform and interconnected pore distribution is constructed on the basis of ensuring that no high-temperature phase change or decomposition occurs at a low temperature. The inorganic compound electrolyte thin film significantly improves the air stability of the sulfide and halide solid-state electrolyte, the ion conductivity is greater than or equal to 1.8 mS cm ‑1 at 30 DEG C, the ion transference number is 0.6-0.8, and the electrochemical window is greater than or equal to 4.3 V vs. Li + / Li, the energy density of the solid-state battery of the inorganic compound electrolyte is significantly improved, and the problems of poor contact between the sulfide solid-state electrolyte and the electrode, serious interface side reactions and a narrow electrochemical window are solved.

A hybrid solid-state electrolyte layer for use in an electrochemical cell is provided. The hybrid solid-state electrolyte layer includes a polymeric material, a ceramic material, and an interfacial material adhering the polymeric material and the ceramic material. The interfacial material includes a branched copolymer that includes dopamine and a second monomer. The second monomer forms a polymeric moiety in the copolymer that is the same or similar to the polymeric material. In certain variations, the polymeric material defines a polymeric layer, the ceramic material defines a ceramic layer, and the interfacial material defines an interfacial layer that is disposed between the polymeric layer and the ceramic layer. In other variations, the polymeric material defines a polymeric matrix, the ceramic material defines a plurality of ceramic particles dispersed in the polymeric matrix, and the plurality of ceramic particles are coated with the interfacial material.

A solid-state electrolyte for lithium-ion cell is provided. The solid-state electrolyte includes a garnet-type solid-state electrolyte and a polymer filler, wherein the polymer filler is dispersed within the garnet-type solid-state electrolyte. The garnet-type solid-state electrolyte does not contain lithium carbonate, and the content of the garnet-type solid-state electrolyte is 60 wt % or more based on the total weight of the garnet-type solid-state electrolyte and the polymer filler.