677 results about "Polymer electrolytes" patented technology

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

A preparation method for a dual-enhanced interface solid polymer electrolyte by means of step-by-step polymerization, the preparation method comprising: mixing a matrix monomer and a first photoinitiator to obtain a mixed slurry, and illuminating same to obtain a pre-polymerized slurry; adding a lithium salt and a second photoinitiator to the pre-polymerized slurry, mixing same to obtain a polymer slurry, dividing the polymer slurry into a first polymer slurry and a second polymer slurry, adding a nitrogen-containing functional monomer to the first polymer slurry to obtain a polymer slurry A, and adding a fluorine-containing functional monomer to the second polymer slurry to obtain a polymer slurry B; and pouring the polymer slurry A on a first face of a base membrane, performing a treatment on same, pouring the polymer slurry B on a second face of the base membrane, and performing a treatment on same, so as to obtain a stepwise-polymerized dual-enhanced interface solid polymer electrolyte. The solid polymer electrolyte is prepared by means of using a step-by-step polymerization method, thereby optimizing a positive electrode side interface and a negative electrode side interface, and realizing continuous large-scale production of a solid polymer electrolyte.

The invention relates to the technical field of polymer electrolytes, in particular to a composite solid electrolyte based on aramid nanofibers and a lithium-sulfur battery. The composite solid electrolyte is prepared by taking a composite aramid nanofiber membrane with a double-layer three-dimensional structure as a base material, an upper polyaniline base material provides good interface contact stability with a lithium negative electrode, and a lower aramid nanofiber skeleton provides good mechanical support performance for the fiber membrane; and meanwhile, the electrochemical performance of the composite solid electrolyte is comprehensively improved by doping the special porous structure of the composite solid electrolyte with the core-shell porous carbon.

The invention provides a polymer electrolyte, a secondary battery and a preparation method of the polymer electrolyte and the secondary battery. The non-aqueous electrolyte comprises an organic solvent, an electrolyte salt, a borate derivative with the mass fraction of 0.1%-15%, a sulfonyl-containing cross-linking agent A with the mass fraction of 0.1%-4%, a cross-linking agent B at least containing three carbon-carbon double bonds and an initiator, the mass ratio of the cross-linking agent B to the cross-linking agent A is (1-100): 1, the mass fraction of the borate derivative is 0.1%-15%, the mass fraction of the sulfonyl-containing cross-linking agent A is 0.1%-4%, and the mass fraction of the initiator is 0.1%-1%. The mass ratio of the sum of the mass of the borate derivative, the cross-linking agent A and the cross-linking agent B to the mass of the initiator is (1000-20): 1. The polymer electrolyte provided by the invention has high ionic conductivity, can improve the safety performance of a battery in a high proportion state, and can maintain good cycle performance at the same time.

The invention provides a gel electrolyte with a controllable polymerization degree, a preparation method of the gel electrolyte, a semi-solid lithium ion secondary battery and a preparation method of the semi-solid lithium ion secondary battery, and relates to the technical field of lithium ion batteries. Raw materials for preparing the gel electrolyte comprise a cyclic ether monomer, an initiator and a polymerization inhibitor; the cyclic ether monomer is subjected to ring opening polymerization to obtain an ether polymer; the polymerization inhibitor is an inorganic lithium salt, and the polymerization degree of the gel electrolyte is determined by the dosage of the polymerization inhibitor and the dosage of the initiator. The gel electrolyte provided by the invention has the fluidity advantage of a liquid electrolyte and the flexibility advantage of a solid polymer electrolyte, and is beneficial to maintaining a stable contact interface between the electrolyte and an electrode, reducing interface impedance and improving ion transmission.

The invention provides a Lewis acid metal ion-piperazine modified nanocellulose film as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The preparation method comprises the following steps: mixing carboxylated nanocellulose with Lewis acidic metal salt in a solution, and carrying out pre-crosslinking reaction to obtain Lewis acidic metal ion modified carboxylated nanocellulose; a piperazine ligand compound and dopamine hydrochloride are added into the Lewis acidic metal ion modified carboxylated nano-cellulose, a cross-linking reaction is carried out with Lewis acidic metal ions as the center, suction filtration is carried out, and a film is formed. The metal in the Lewis acid metal salt is metal cations with the valence of more than bivalent. The carboxylated nanocellulose, the Lewis acid metal ion-piperazine complex and the solid polymer electrolyte are organically combined together for the first time and are applied to the lithium metal battery, the unique advantages of the lithium metal battery in the field of batteries are shown, and the rate capability and the cycling stability are greatly improved.

The invention discloses a fluorinated COF enhanced PVDF-HFP composite gel polymer electrolyte. The fluorinated COF enhanced PVDF-HFP composite gel polymer electrolyte is prepared from the following raw materials: polyvinylidene fluoride-co-hexafluoropropylene, a fluorinated covalent organic framework containing an ether oxygen bond and a carbon-carbon unsaturated double bond, bis (trifluoromethylsulfonyl) imide anion ionic liquid and fluorine-containing imide lithium salt, the fluorinated covalent organic framework containing the ether-oxygen bond and the carbon-carbon unsaturated double bond is prepared by carrying out condensation reaction on a perfluorophenylene-containing module and the ether-oxygen bond-containing aromatic module. According to the electrolyte, PVDF-HFP is used as a polymer matrix, bis (trifluoromethylsulfonyl) imidogen ionic liquid is used as a functional phase and a plasticizer, imide lithium salt is used as a lithium ion source, fluorinated COF containing ether oxygen bonds and olefinic bonds is introduced, and the electrolyte has high ionic conductivity, high lithium ion transference number, excellent mechanical property and interface stability; the method is especially suitable for a high-safety lithium metal battery system.

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 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 polyether polyurethane solid polymer, a preparation method thereof and application of the polyether polyurethane solid polymer in a solid electrolyte, and belongs to the technical field of polymer electrolytes and preparation of the polymer electrolytes. The problems that an existing solid polymer electrolyte is low in ionic conductivity and poor in interface stability are solved. According to the invention, polyether amine and cyclic carbonate are subjected to an in-situ polymerization reaction to synthesize a series of polyether polyurethane solid polymer electrolytes with different molecular weights and monomer proportions. The obtained polyether polyurethane solid polymer electrolyte contains rich carbamate groups, hydroxyl groups, fluorine ions and the like, and can form a strong reversible hydrogen bond network, so that the electrolyte has excellent mechanical properties, can be used as a self-supporting electrolyte membrane, and does not need an additional diaphragm. Meanwhile, a large number of dynamic reversible hydrogen bonds also enable the solid polymer electrolyte to have excellent self-healing ability, and can be self-repaired when the battery is damaged by external force in the operation process, so that the structural stability of the solid polymer electrolyte is remarkably 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.

The invention relates to the technical field of electrolyte, in particular to a thioether cross-linked solid polymer electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: taking N, N-dimethylformamide, respectively adding 3, 6-dioxa-1, 8-octane dithiol and triglycidyl isocyanurate, and uniformly stirring to obtain a mixed solution; adding bis (trifluoromethylsulfonyl) imide lithium into the mixed solution, putting magnetons on a magnetic stirrer, and completely dissolving the magnetons to obtain a precursor solution; and pouring a proper amount of the precursor solution into a polytetrafluoroethylene mold, spreading, and carrying out cross-linking polymerization in a blast oven to form the film. The three-dimensional thioether cross-linked network structure has a large number of weakly coordinated thioether groups, dissociation of lithium salt can be promoted, a large number of free Li < + > is generated, the number of Li < + > is increased, meanwhile, the crystallinity of a polymer is remarkably reduced, the ionic conductivity is improved, the mechanical stability of a film can be improved, and the service life of a battery is effectively prolonged.

The embodiment of the invention discloses a negative electrode and a preparation method thereof and a battery, the negative electrode comprises a silica material, a first material and a binder, the first material comprises MXene of a lithium intercalation layer and an elastic polymer electrolyte coating layer coating the surface of the MXene of the lithium intercalation layer, and a three-dimensional elastic network with ionic conductivity is constructed by adhering a binder to the periphery of the silica material. Under the combined action of the network and MXene particles of a rigid lithium intercalation dispersed in the network, the huge volume expansion of the silica material in the circulation process can be effectively bound and buffered, and the integrity and stability of the electrode structure are maintained. Meanwhile, the elastic polymer electrolyte is used as an ionic conductor, so that an additional path is provided for storage and transmission of lithium ions in lithium intercalation MXene; and meanwhile, the MXene of the lithium intercalation layer can also be used as a lithium supplementing material, so that the first coulombic efficiency of the battery is effectively improved.

The invention relates to the technical field of energy storage materials, and provides a composite solid polymer electrolyte membrane and a preparation method thereof.The composite solid polymer electrolyte membrane is prepared through the steps that a polymer matrix serves as a matrix, a polar solvent is adopted for dissolving to form a pure polymer solution, then lithium salt and nematic phase liquid crystal E7 are added, a chiral dopant can also be added, uniform printing slurry is formed, and the composite solid polymer electrolyte membrane is obtained through 3D printing. And carrying out hot pressing treatment to prepare the composite solid polymer electrolyte membrane. The electrolyte membrane prepared by the invention has a controllable porous structure, a high dielectric constant and excellent piezoelectricity and energy storage performance, complex structures such as a three-dimensional grid and a porous structure can be directly printed, and the thickness and shape of the membrane can be accurately controlled by adjusting parameters such as a printing path, a layer height and filling density; the method is very suitable for the requirements of rapid customization of product shapes and sizes in the fields of flexible electronics, wearable equipment and the like. The invention also provides an application of the composite solid polymer electrolyte membrane prepared by the method in an energy storage device.

The invention provides a composite solid electrolyte based on a porous meta-aramid nanofiber membrane and a fluorinated metal organic framework. A preparation method of the composite solid electrolyte comprises the following steps: preparing a porous poly (m-phenylene isophthalamide) nanofiber membrane; the fluorinated metal organic framework is prepared through two-step heat treatment synthesis and fluorination modification; and finally, coating the nanofiber membrane with a polymer electrolyte matrix comprising a fluorinated metal organic framework, polyethylene oxide and lithium salt to prepare the composite solid electrolyte. Through the synergistic effect of the porous polyisophthaloyl metaphenylene diamine nanofiber membrane and the fluorinated metal organic framework, while the mechanical strength and dendritic crystal inhibition capability of the composite solid electrolyte are remarkably improved, lithium ion transmission is effectively promoted, and the interface impedance is reduced; the prepared composite solid electrolyte is suitable for preparing a solid lithium metal battery with high safety and high performance.

The invention relates to a polyurethane-based composite solid polymer electrolyte film and a preparation method and application thereof, and belongs to the field of organic polymer solid electrolyte preparation. Polyethylene glycol-polypropylene glycol triblock copolymer and hydroxyl-terminated polybutadiene are used as soft segments, isophorone diisocyanate is used as a hard segment, and under the action of a catalyst, the polyurethane-based composite solid polymer electrolyte film is prepared. A chain extender containing disulfide bonds is utilized, and a polyurethane elastomer is prepared through gradual addition polymerization reaction; a polyurethane elastomer and a mixed solution of a lithium salt and a polyvinylidene fluoride-hexafluoropropylene copolymer are uniformly mixed, the polyurethane elastomer accounts for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, a precursor solution is obtained, the precursor solution is prepared into a film, and the polyurethane-based composite solid polymer electrolyte film is obtained. The polymer solid electrolyte membrane with excellent mechanical property and excellent lithium ion conductivity is constructed, and the development requirement of a high-performance lithium metal battery is met.

A method for forming a shaped battery can include: adding electrolyte to a dry battery cell, shaping the battery cell, relieving stress and / or strain from the battery cell, curing the electrolyte, and / or injection moulding a thermoplastic or thermoset around the battery cell. A battery cell can include a cathode, an anode, a separator disposed between the cathode and the anode, a gel polymer electrolyte, an overmoulded housing surrounding the cathode, the anode, the separator, and the gel polymer electrolyte, where the battery cell comprises a non-zero radius of curvature about at least 1 axis.

The invention relates to the technical field of solid polymer electrolyte, in particular to fluorine ion solid polymer electrolyte as well as a preparation method and application thereof. Aiming at the technical problems of narrow electrochemical stability window, low room-temperature fluorine ion conductivity and poor fluorine ion electrochemical reversibility of the existing electrolyte for the fluorine ion battery, the invention provides the solid polymer electrolyte for the fluorine ion battery based on the hydrogen-bond interaction between a plasticizer and a polymer skeleton. The water-soluble fluorine-containing polymer is prepared from fluorine ion salt, a polymer monomer containing hydroxyl or amino, a cross-linking agent and a protonic plasticizer. Based on the physical confinement of a polymer network, a plasticizer hydrogen bond and a solid polymer skeleton on the plasticizer, the electrochemical stability window of the electrolyte is widened, the high-room-temperature fluorine ion conductivity of the electrolyte is reserved, desolvation of fluorine ions is promoted, migration barriers of an interface and a bulk phase are reduced, and the performance of the electrolyte is improved. The reaction activity and the battery reversibility are improved, and the application prospect is good.

The invention relates to the technical field of secondary batteries and electrolyte materials, in particular to a battery with multi-layer gel polymer electrolyte and a preparation method thereof.The battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, 0.1 wt%-3wt% of positive active molecules are added into an adhesion layer of the positive plate, and the adhesion layer of the negative plate is filled with negative active molecules; positive electrode active molecules are alkoxy grafted silane materials containing terminal alkenyl, 0.1 wt%-3wt% of negative electrode active molecules are added into the adhesion layer of the negative plate, the negative electrode active molecules are ether-containing acrylate materials, and functional coatings for preventing the active molecules from entering the diaphragm are arranged on the two sides of the diaphragm; 0.1 wt%-10 wt% of a cross-linking agent and 0.01 wt%-5 wt% of an initiator are added into the electrolyte. Through fine design of active molecules, different gel polymer electrolytes are constructed on the positive electrode side and the negative electrode side in situ, and the problem that systematic mismatch of a multi-layer gel structure easily causes synergistic failure of the multi-layer structure is solved.

The invention provides a lithium battery negative electrode with an interface polymer stable interface layer and a preparation method and application of the lithium battery negative electrode. The preparation method comprises the following steps: providing an alloy negative electrode substrate of which the surface is modified by an organic lithium interface layer; and coating a polymer electrolyte precursor containing an electron-deficient double-bond polymer monomer, lithium salt and succinonitrile on the surface of the negative electrode, sealing and standing for 1-24 hours, and triggering the electron-deficient double-bond polymer monomer to generate in-situ anionic polymerization on the surface of the alloy negative electrode substrate by using an organic lithium interface layer as an initiator, thereby obtaining the lithium ion battery negative electrode. A polymer interface layer chemically bonded with the substrate is formed on the surface of the lithium battery negative electrode. Through an innovative interfacial polymerization technology, a stable polymer interface layer is constructed on the surface of the alloy negative electrode, and the interface stability, the electrochemical performance, the structural integrity, the process practicability and other dimensions are remarkably improved.

The invention discloses a flexible transparent film lithium ion battery and a preparation method thereof, and belongs to the field of flexible transparent energy storage devices. The lithium ion battery comprises a positive pole piece, a negative pole piece and a transparent polymer semi-solid electrolyte membrane positioned between the positive pole piece and the negative pole piece, the positive pole piece comprises an Au mesh / PET (Polyethylene Terephthalate) current collector substrate and a LiMn2O4 (at) MWCNTs positive active material layer sprayed on the surface of the Au mesh / PET current collector substrate; the negative electrode plate comprises an Au mesh / PET current collector substrate and a Li4Ti5O12-coated MWCNTs negative electrode active material layer sprayed on the surface of the Au mesh / PET current collector substrate; the transparent polymer semi-solid electrolyte membrane is a PVDF-HFP / PMMA (Polyvinylidene Fluoride-HFPP / Polymethyl Methacrylate)-based gel polymer electrolyte membrane and comprises LiTFSI (LiTFSI) and EMImTFSI. The flexible transparent film lithium ion battery prepared by the invention is of a semi-solid laminated structure, has the advantages of high flexibility, high transparency, excellent cycle performance, rate capability, high bending resistance and the like, and has a good application prospect.

To improve the mechanical strength of hydrocarbon-based electrolyte membranes. [Solution] An electrolyte membrane 10A comprising a porous membrane 1 and a hydrocarbon-based electrolyte polymer filled in the pores 2 of the porous membrane 1, wherein the porous membrane 1 is formed of a material containing a hydrocarbon-based resin, and the differential permeate flow rate distribution of the porous membrane 1 measured by the bubble point method has a peak in the pore diameter range of 0.01 to 1 μm.

The present invention relates to an electrochemical cell comprising an anode, a polymer electrolyte and an NMC type cathode active material. The polymer electrolyte comprises an electrolyte composition, preferably comprising a deep eutectic solvent (DES), and a polymer network having a polyacrylamide backbone.

A membrane electrode assembly for a fuel cell includes, in this order, a cathode catalyst layer, a solid polymer electrolyte membrane, and an anode catalyst layer. The cathode catalyst layer contains at least a catalyst and a highly oxygen-permeable ionomer. At least one selected from the group consisting of the cathode catalyst layer, the solid polymer electrolyte membrane, and the anode catalyst layer contains a nitrogen-containing multidentate ligand coordinatable to an iron ion.

The invention relates to the technical field of solid-state batteries, in particular to a solid-state polymer electrolyte, a preparation method of the solid-state polymer electrolyte, a positive pole piece, a solid-state lithium battery, a preparation method of the solid-state lithium battery and electric equipment. The solid polymer electrolyte is mainly prepared from a lithium salt, a carbonic ester monomer containing a carbon-carbon double bond and a monomer having a binding effect on anions in the lithium salt; the structural formula of the carbonic ester monomer is shown in the specification, wherein M is a group containing a carbonic ester group. According to the invention, a cooperative regulation strategy of a structure with a binding effect on anions in the lithium salt and the carbonate monomer is adopted, so that the limitation on the anions in the lithium salt is increased, the transference number of lithium ions can be increased, the highest occupied molecular orbital energy level of the whole polymer electrolyte is reduced, and an electrochemical stability window is widened.

Composite solid polymer electrolytes (SPE), organic cathode electrodes, and solid-state lithium batteries (SLBs) that incorporate the SPE and / or the organic cathode electrodes. The composite solid polymer electrolytes include a hybrid polymer matrix, an LiTFSI salt dispersed in the matrix polymer matrix, and an LLZTO ceramic filler dispersed in the matrix polymer matrix. The organic cathode electrodes contain perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA).

The present invention relates to a polymer electrolyte membrane, a method for manufacturing same, and a membrane-electrode assembly, a water electrolysis cell, and a fuel cell each comprising same. The polymer electrolyte membrane comprises, as an electrolyte, a reaction product of a cation conductor and an amine compound, wherein the cation conductor includes at least one sulfonic acid group as a side chain, and the amine compound includes at least one sulfonic acid group as a side chain and at least one amino group as a side chain, a terminal, or a combination thereof.