34results about How to "Improve interface impedance" patented technology

Method for heating tissue by delivering radio frequency energy through tissue electrodes having controlling energy delivery so that an abrupt increase in impedance between the electrodes and the tissue is observed, typically in the form of an abrupt decrease in power delivered to the electrodes. The power at which the impedance increases and/or the time required to induce such an increase in impedance, are relied on to determine acceptable ranges to achieve a maximum sustainable delivery of radio frequency energy to the tissue consistent with complete, rapid, and uniform heating of the tissue.

The invention discloses a gel composite positive pole plate. The gel composite positive pole plate is characterized by comprising a positive active substance, a conductive agent, a gel electrolyte, abinding agent and a current collector, wherein the binding agent, the conductive agent, the gel electrolyte and the positive active substance form a layered structure on a surface of the current collector, and the conductive agent and the gel electrolyte are uniformly dispersed in the positive active substrate and are associated via the binding agent. The invention also discloses a method for preparing the gel composite positive pole plate and a method for preparing an all-solid-state lithium battery.

The invention provides an electrolyte for a high-voltage lithium ion battery, and belongs to the field of a lithium ion battery. The electrolyte comprises a non-aqueous organic solvent, a lithium saltand an additive, wherein the non-aqueous organic solvent is an ester solvent, the mass percent of the non-aqueous organic solvent accounts for 95% or above, the lithium salt is LiPF6, the concentration of the lithium salt is (1.0-1.5)mol/L, the additive is a mixture of a dinitrile compound and a boron-containing compound, and the mass percent of the additive accounts for 1-5%. The electrolyte employing the mixture of the dinitrile compound and borate as an electrolyte additive is applicable to a high-voltage positive electrode material LiNi<0.5>Mn<1.5>O<4> system, it is found that the interface impedance of the lithium ion battery positive electrode material can be improved by such the electrolyte, and moreover, the cycle stability of the lithium ion battery under a normal temperature isimproved.

The invention relates to a high-safety solid-state electrolyte and a preparation method thereof, and application in a lithium secondary battery. According to the invention, a solid-state electrolyte precursor solution comprises a lithium salt, an isocyanate-containing compound and a hydroxyl-containing polymer monomer, a solid-state electrolyte is obtained by polymerizing the precursor solution, the polymerization temperature ranges from 20 DEG C to 80 DEG C, the solid-state electrolyte precursor solution further comprises one or more of a plasticizer, an active monomer, an initiator and a catalyst, and the solid-state electrolyte contains polymerizable groups, and can be subjected to a polymerization reaction at a temperature higher than 100 DEG C to form a polymer with a cross-linked network structure, so that the lithium battery does not generate internal short circuit under extremely high temperature conditions such as heat abuse and the like, and the safety performance of the lithium battery is improved.

The invention discloses a preparation method of a polymer gel electrolyte membrane. The preparation method includes following steps: S1, mixing polyethylene glycol diglycidyl ether, polyether amine and solvent to obtain a precursor solution; S2, applying the precursor solution on a porous thin film, and heating for reaction to obtain a polymer membrane supported by the porous thin film; S3, soaking the polymer membrane in liquid-state electrolyte to adsorb the same to obtain the polymer gel electrolyte membrane supported by the porous thin film. The polymer gel electrolyte membrane is high in mechanical stability, ion conductivity and compatibility with a metal sodium interface. The invention further provides the polymer gel electrolyte membrane prepared by the method and a sodium secondary battery using the polymer gel electrolyte membrane.

The invention discloses a method for preparing a polymer gel electrolyte cell. The method comprises the following steps of: (1) polymer powder pretreatment: performing high-speed ball-milling on a polymer powder body, and thus obtaining powder with the granularity less than 1 mu m; (2) polymer powder dispersion: mixing the polymer powder which is obtained by ball-milling in the step (1) with a non-aqueous solvent, lithium salt and an additive to prepare sub-micron-sized polymer suspended dispersion liquid; and (3) electrolyte gelatinization: injecting the polymer suspended dispersion liquid which is prepared in the step (2) into a lithium ion cell for full immersion, gelatinizing at high temperature for 1 to 12 hours, and cooling to obtain the polymer gel electrolyte cell. Compared with the prior art, the polymer gel electrolyte cell prepared by using the method is high in ionic conductivity, low in battery internal resistance, long in cycle life, high in high-temperature performance, high in safety performance and free from liquid leakage risk. The polymer gel electrolyte cell is obviously superior to an electrolyte cell prepared by using a conventional preparation method in terms of comprehensive performance.

The invention belongs to the technical field of lithium battery, and especially relates to a solid state electrolyte membrane electrical core layer structure interface processing method, and a lithiumelectrical core structure. The solid state electrolyte membrane electrical core layer structure interface processing method comprises following steps: a solid state electrolyte membrane is provided;an electrode active material layer is formed on the solid state electrolyte membrane so as to form a pre-electrical-core layer structure; a preset hot pressing temperature and a preset pressing pressure are adopted for hot pressing treatment of the pre-electrical-core layer structure, wherein the preset hot pressing temperature and the preset pressing pressure are the critical temperature and thecritical pressure of conversion of solid phase into mobile phase of the solid state electrolyte membrane. Under the preset hot pressing temperature and the preset pressing pressure, the solid state electrolyte membrane is converted from solid phase into liquid phase, so that the interface resistance between the solid state electrolyte membrane and the electrode active material is reduced preferably, and the conductivity of conductive ions between the solid state electrolyte membrane and the electrode active material is improved.

The invention discloses a lithium battery separator coated with a mixed coating layer and a preparation method of the lithium battery separator. The lithium battery separator comprises a basic film and the coating layer, wherein the coating layer is formed by coating a mixed coating layer dispersion paste at one side or two sides of the basic film. The preparation method comprises the steps of mixing an organic main material and an inorganic main material to obtain the mixed coating layer dispersion paste under effects of a co-solvent, a binding agent and a pore forming agent; coating the paste onto the lithium battery basic film to obtain a separator with the coating layer being 1-2 micrometers; and finally, quenching the coating separator by a quenching agent, and obtaining the lithium battery separator coated with the mixed coating layer after drying. The lithium battery separator has high strength, good thermal stability and excellent gas permeability, and meanwhile, the lithium battery separator is simple in fabrication process, low in cost and can be produced on a large scale.

The invention discloses high-voltage electrolyte containing a novel additive. The high-voltage electrolyte is prepared from the following raw materials in percentage by mass: lithium salt, 85 to 95 percent of organic solvents, 2 to 8 percent of additives A and 5 to 8 percent of additives B. The high-voltage electrolyte containing the novel additive has the advantages that dibenzothiophene sulfonecontaining sulfur elements is used as a high-voltage additive of the lithium-ion electrolyte; the battery interface resistance is improved; the high-voltage performance of a lithium-ion battery is improved; the negative element material can be effectively coated by ethyl ester sulfate; the room temperature cycle performance under high voltage is greatly improved.

The invention relates to an electrolyte for a lithium ion battery. The electrolyte includes lithium salt, an organic solvent and an additive, and tris (trimethylsilyl) boron is adopted as the additive. The electrolyte is applied to the lithium ion battery, the work voltage of the electrolyte ranges from 4.5 V to 4.7 V, the work temperature range is the indoor temperature of 60 DEG C, the good high temperature and high voltage resisting circulating performance is achieved, and the high temperature and high voltage functional nonaqueous electrolyte is simple and easy to obtain.

The invention provides a sulfide solid electrolyte sheet and a preparation method thereof. The invention provides a sulfide solid electrolyte sheet which comprises a sulfide electrolyte material and aboron element doped in the sulfide electrolyte material, and the relative deviation (B0B100)/B0 between the mass concentration B0 of the boron element at any position on the surface of the electrolyte sheet and the mass concentration B100 of the boron element at a position 100 [mu] m away from the position does not exceed 20%. In the sulfide solid electrolyte sheet disclosed in the application, the boron element introduced into the sulfide solid electrolyte can effectively reduce the binding effect of anions on lithium ions, and improve the transmission capacity of the lithium ions; the boronelement is uniformly distributed in the sulfide solid electrolyte, the doping uniformity and the conductivity of the solid electrolyte are improved, and the surface roughness of the solid electrolytesheet is remarkably improved, so that the diffusion process of lithium ions in the sulfide solid electrolyte sheet and a lithium metal anode interface is facilitated, the interface impedance is reduced, and the cycle performance of the battery is improved.

The invention provides a functionalized polyolefin composite diaphragm and a preparation method and an application thereof. The functionalized polyolefin composite diaphragm disclosed by the inventionis composed of carbon nanotubes, lithium salt, inorganic nano silicon dioxide and polyolefin components. The preparation method comprises the following steps of mixing solution of binder and the functionalized carbon nanotubes with the nano silicon dioxide to obtain coating solution, putting a polyolefin diaphragm into ethanol solution of lithium salt to obtain a lithium salt modified polyolefindiaphragm, then uniformly coating the lithium salt modified polyolefin diaphragm with the coating liquid. The method is advantaged in that the prepared diaphragm has advantages of excellent mechanicalstrength, high stability, high active surface area, good electrolyte wettability, excellent lithium ion conduction capability and excellent electrochemical performance, and can be well applied to thefield of lithium ion batteries.

The invention provides a positive pole piece and a solid-state battery comprising the same. The positive pole piece comprises a solid electrolyte, the solid electrolyte comprises a polymer, the polymer comprises a structural unit from an olefin compound containing a substituted or unsubstituted ureido group, and the olefin compound further comprises at least one cyclic group. According to the positive pole piece disclosed by the invention, the composition of the polymer in the positive pole piece is limited, so that the interface impedance between the positive pole piece and the solid electrolyte can be effectively improved.

The invention discloses a solid-state battery with low interface impedance, and a preparation method thereof, and relates to the technical field of solid-state batteries. The solid-state battery is prepared by laminating or winding a positive plate with a coating on at least one side and a negative plate with a coating on at least one side together, laminating the coating surfaces, adopting hot pressing and then cold pressing to mutually fuse the coatings on the positive plate and the negative plate, and cooling and curing are performed to form a thermoplastic organic/inorganic electrolyte coating. The positive plate with the coating and the negative plate with the coating are obtained by respectively coating thermoplastic organic/inorganic electrolyte slurry on the composite positive plate and the composite negative plate and then drying; and the composite positive plate and the composite negative plate are obtained by adding an inorganic solid electrolyte, a lithium salt, a conductive agent, a binder and an active substance into a solvent to respectively prepare positive slurry and negative slurry, coating a current collector with the positive slurry and the negative slurry, curing and rolling. The ion interface impedance is effectively reduced, the electrochemical performance of the battery is improved, and industrialization is easy to realize.

The invention provides an additive for a lithium ion battery electrolyte, the electrolyte and a lithium ion battery, the additive comprises a first additive and a second additive, the first additive is a compound with a structural formula as shown in a formula I, and the second additive is an unsaturated alkane compound comprising at least two silicon-oxygen structures. Compared with the existing electrolyte additive, the additive provided by the invention can generate a stable and low-impedance interfacial film through the combined action of the first additive and the second additive on the surfaces of the positive electrode and the negative electrode respectively, can improve the hot box performance and the low-temperature performance of the lithium ion battery, and simultaneously considers the cycle performance and the storage performance.

The invention provides a lithium ion battery electrolyte and a lithium ion battery, the lithium ion battery electrolyte comprises a lithium salt, an organic solvent, a first additive and a second additive, the first additive has a structural formula as shown in formula I; the second additive has a structural formula as shown in a formula II; the two additives have a synergistic effect and generate stable and low-impedance interfacial films on the surfaces of a positive electrode and a negative electrode respectively, so that the hot box performance and the low-temperature performance of the battery are improved, and meanwhile, the cycle performance and the storage performance of the battery are both improved.