11104results about How to "Improved magnification performance" patented technology

The invention relates to a graphene composite lithium ion battery anode material lithium iron phosphate and a preparation method thereof. The composite material of lithium iron phosphate and graphene is connected by interface of chemical bonding. The invention also provides the method for preparing the graphene composite lithium ion battery anode material lithium iron phosphate in an in-situ symbiosis reaction mode, and the obtained anode material has high tap density and good magnifying performance, and is suitable to be used as a anode material of a lithium ion power battery.

An absorbent article has a body facing side which is positioned against the users body. The absorbent article is made of, at least, a backsheet, an absorbent core, and a composite topsheet. The backsheet is opposite the body facing side. The absorbent core is between the backsheet and the body facing side. The composite topsheet is between the absorbent core and the body facing side. The composite topsheet includes a resilient three dimensional apertured formed film, a nonwoven web small scale apertures, and large scale apertures. The formed film is between the absorbent core and the body facing side. The formed film has a male side and a female side opposite the male side, and small scale apertures with a mesh count. The nonwoven web of fibers is between the formed film and the body facing side of the absorbent article. The large scale apertures extend through the nonwoven web and the formed film. The large scale apertures have a mesh count which is less than the mesh count of the small scale apertures.

The invention discloses a graphite powder of the cathode of a lithium ion battery, and a preparation method thereof; the technical problem to be solved is that the transmission speed of a lithium ion and an electrolyte to the inside of the electrode needs to be increased. The graphite powder of the cathode of the lithium ion battery of the invention has the microscopic feature of massive, spherical and near-spherical shapes and has the characteristics of nano-porous. The preparation method thereof comprises the following steps of: grinding, adding coating modifiers or / and catalysts, mixing, dissolving, and carrying out preheating treatment and heat treatment. Compared with the prior art, the invention carries out modifying treatment to graphite material and realizes the characteristic of nano-porous by adding pore-forming agents, thus being beneficial to the transmission of the lithium ion, improving the liquid-absorbing performance of a pole piece after compaction, reducing the content of impurity in the graphite, improving the liquid-absorbing performance and the magnification performance of the graphite material, meeting the requirements of the lithium ion dynamic battery for the compatibility and the charging and discharging performance with large magnification of the electrolyte of the graphite material and having the advantages of lower production cost, simple technique and easy industrialization.

Embodiments of the present invention provide an all-solid state lithium ion battery composite positive electrode material, which comprises a positive electrode active material and a cladding layer arranged on the surface of the positive electrode active material, the positive electrode active material is one or a plurality of materials selected from a lithium cobalt oxide, lithium nickelate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganese, vanadium pentoxide, molybdenum trioxide and titanium disulfide, and the cladding layer material is one or a plurality of lithium-containing transition metal oxides. According to the present invention, with the cladding layer, formation of the space charge layer can be effectively inhibited, the electrode / inorganic solid state electrolyte interface can be improved, and the interface resistance of the all-solid state lithium ion battery can be easily reduced so as to improve cycle stability and durability of the all-solid state lithium ion battery. Embodiments of the present invention further provide a preparation method for the all-solid state lithium ion battery composite positive electrode material, and an all-solid state lithium ion battery containing the all-solid state lithium ion battery composite positive electrode material.

The invention relates to a preparation method of a hard carbon cathode material. The preparation method comprises the step of preparing the hard carbon cathode material by using thermosetting resin or pyrolysis products of a mixture of thermosetting resin and thermoplastic resin as a hard carbon matrix and adopting a carbon material as a coating. In the preparation process of the hard carbon cathode material, a curing agent and a doping matter can be added. The hard carbon cathode material prepared by adopting the preparation method has the characteristics of high capacity, high first-time coulombic efficiency, excellent rate performance, low cost and the like, and is suitable for industrialized production.

The invention discloses a method for preparing a lithium ion battery anode / cathode material from reduced graphene oxide. The method comprises the following steps: performing ultrasonic dispersion on graphite oxide in an organic solvent, thereby obtaining a graphene oxide dispersion liquid; reducing by using an appropriate reducing agent or directly using a solvent, oxidizing graphene through oil bath backflow, a hydrothermal method or other reduction methods, thereby obtaining a reduced graphene oxide material containing part of oxygen-containing groups. When the prepared reduced graphene oxide material is used in a lithium ion battery anode material, a relatively high specific discharge capacity can be achieved, that is, is up to 280mAh / g, and good circulation stability and excellent rate performance are achieved. The prepared reduced graphene oxide material can be also used in a lithium ion battery cathode material, the specific discharge capacity can be kept being 900mAh / g and more than 900mAh / g after 100 rounds of charge / discharge circulation, and the circulation stability is relatively good. The method can be a significant study point of high-performance low-cost electrode materials of lithium ion batteries.

The invention discloses a chargeable zinc ion battery, which comprises an anode, a cathode, isolating membrane arranged between the anode and the cathode, and electrolyte which contains the anion and the cation and has ionicconductivity, wherein the cathode adopts active materials which are mainly zinc elements, the active materials of the anode are oxide materials of manganese which can occlude and release zinc ions, the electrolyte is liquid or gel materials with ionicconductivity which adopts the soluble salt of zinc as solute and water as solvent, and the pH value of the electrolyte lies between 3 and 7. The battery has the characteristics of high capacity, chargeable property, long cycle life and the like. Proven by experiments, the chargeable zinc ion battery has excellent rate performance, reversible performance and cycle performance.

The invention discloses a carbon-coated ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a ternary positive electrode material precursor by taking nickel salt, cobalt salt and manganese salt as raw materials; S2, preparing a conductive carbon dispersion system, wherein conductive carbon is dispersed in water containing an organic carbon source; S3, adding the ternary positive electrode material precursor and a lithium compound into the conductive carbon dispersion system, and mixing uniformly to obtain a mixture; S4, drying the mixture under a vacuum condition; S5, carrying out high temperature treatment on the dried mixture under a closed condition or in an inert gas protection atmosphere so as to obtain the carbon-coated ternary positive electrode material. The carbon-coated ternary positive electrode material is uniform in coating, simple to operate, low in cost and high in efficiency; the conductive carbon and the ternary positive electrode material are simultaneously coated with network-shaped amorphous carbon which serves as a conductive medium or a channel of the conductive carbon and the ternary positive electrode material, thereby greatly improving the rate performance of the ternary positive electrode material.

The invention belongs to the technical field of lithium batteries and discloses a steel shell type cylindrical lithium ion battery and a manufacturing method therefor. The technical scheme adopted by the invention is as follow: the cylindrical lithium ion battery comprises a cylindrical steel shell, a positive plate, a negative plate and a diaphragm, wherein two sides of each of the positive plate and the negative plate are coated with active substances with corresponding activities; the positive plate, the negative plate and the diaphragm are arranged at intervals and wound into a battery cell; the battery is characterized in that a negative current collector is further arranged on an outer layer of the positive plate, the negative plate and the diaphragm arranged at intervals and is wound into the battery cell together with the positive plate, the negative plate and the diaphragm; a tube body is arranged in the middle of the steel shell; the upper part of the tube body is sealed; the periphery of the lower part of the tube body is hermetically connected with the bottom surface of the steel shell; a lower opening of the tube body is communicated with the outside; two short edges and a long edge of the negative plate are left as uncoated regions; the positive plate is provided with a tab; the diaphragm is longer than a coated region on the negative plate at the starting end of winding and wider than the coated region on the negative plate; the center of the battery cell is inserted in the tube body; and the tab of the positive electrode is opposite to the uncoated region of the negative plate in direction.

The invention discloses a lithium nickel cobalt manganese positive electrode material. The lithium nickel cobalt manganese positive electrode material comprises a lithium nickel cobalt manganese oxide contained core pure phase layer having a thickness of 5-8mum, a surface coat containing oxides, phosphates or fluorides of coating elements comprising Li, Al, Mg, Ti and Zr and having a thickness of 50-100nm, and a superficial doped transition layer positioned between the core pure phase layer and the surface coat, containing doping elements comprising Al, Mg, Ti and Zr or one of rare earth elements and having a thickness of 1-2mum. The lithium nickel cobalt manganese positive electrode material can inhibit the material dissolving in a cycle process without reducing a specific capacity, and has the characteristics of high capability excellent cycle and rate performances, and excellent thermal stability.

The invention provides a lithium ion battery gradient core shell cathode material and synthetic method thereof, and relates to a lithium ion battery cathode material and synthetic method thereof. The lithium ion battery gradient core shell cathode material provided by the present invention may have two kinds of core shell structures as follows: a two-layer structure: a ternary material is used as a core material, and a binary material or a unitary material is casing material, and the ternary material external layer is covered by the binary material or the unitary material; three-layer structure: the ternary material is used as a core material, and the binary material and the unitary material are casing materials, and the ternary material external layer is covered with the binary material, and the binary material is covered with the unitary material. The synthetic method includes: employing a coprecipitation method for obtaining a precursor, and then adding lithium source, calcining and coating to obtain the ternary gradient core shell material. Under the prerequisite that the structure stability of the material is kept, the cost is reduced, and the gram capacity of the material is improved, and the material circulating performance and rate capability of the material are improved, and the safety performance and low temperature performance of the ternary cathode material are increased, and the preparation technology is optimized and improved.

The present invention relates to a doped multi-layer core-shell silicon-based composite material for a lithium ion battery, and a preparation method thereof. Other than being doped with a necessary lithium element, the material is also doped with at least a non-metallic element and a metal element; the material has a structure in which a silicon oxide particle doped with elements is taken as a core, and a multilayer composite film which is tightly coated on the surface of the core particle is taken as a shell; the core particle contains uniformly dispersed monoplasmatic silicon nanoparticles,the content of doping elements gradually decreases from the outside to the inside without a clear interface, and a dense lithium silicate compound is formed on the surface of the core particle by embedding and doping the lithium element; and the multilayer composite film is a carbon film layer and a doped composite film layer composed of the carbon film layer and other elemental components. The doped multi-layer core-shell silicon-based composite material provided by the present invention has a high capacity, good rate performance, high coulombic efficiency, good cycle performance, a low expansion rate, and other electrochemical characteristics when the material is used for the negative electrode of lithium ion battery.

The invention relates to an anode active material, a preparation method of the anode active material, high-performance anode slurry containing the anode active material, and an all-solid-state lithium ion battery. The anode active material is a nickel-rich type core-shell structure particle or a nickel-rich type core-shell structure particle coated with an inorganic compound coating layer at the surface; an inner core of the nickel-rich type core-shell structure particle is LiNixCoyMn1-x-yO2; the shell is nickel cobalt lithium aluminate. The invention also provides the high-performance anode slurry, which comprises the anode active material, a composite conductive agent, a composite bonding agent, an additive and an organic solvent, wherein the additive is sulfide solid electrolyte; the anode slurry is used for preparing an anode plate consisting of an anode current collector, an anode slurry layer and a modification layer; the anode plate, the sulfide solid electrolyte and a cathode plate are assembled into the all-solid-state lithium ion battery. The all-solid-state lithium ion battery has the prominent advantages of high mass specific energy, high volumetric specific energy, good rate capability, good cycle performance, high safety and the like, and has wide application prospects.

The invention discloses a method for compounding graphene and a metallic oxide / metallic compound. The method comprises the following steps: a, dissolving graphene oxide in a dispersing agent, regulating the PH value of the solution to be 5-9, and preparing a graphene oxide solution; and b, adding the oxide / metallic compound into the graphene oxide solution, ultrasonically mixing, reacting at the temperature of 70-120 DEG C for 32-40 hours. According to the method for compounding graphene and the metallic oxide / metallic compound, a reducing agent is not used, the composite material is reduced by utilizing the reducing property of graphene oxide in a hydrothermal environment, and the final product forms the uniformly dispersed graphene and oxide / metallic compound composite material by utilizing the high water solubility of the graphene oxide; and moreover, according to the material, the cycle performance, rate capability and gram volume of the oxide which serves as an electrode of a lithium ion battery can be effectively improved, and the impendence is reduced.

The invention relates to a hard carbon negative electrode material of a lithium ion battery, and a preparation method and application of the hard carbon negative electrode material. The hard carbon negative electrode material is doped with silicon and phosphorus, wherein the mass ratio of silicon precursor, phosphorus precursor and hard carbon precursor is 1:(0.1 to 5):(5 to 30). Due to the addition of silicon / phosphorus, the hard carbon negative electrode material provided by the invention is remarkably improved in the first discharge capacity (up to 550.8mAh / g), the first charge / discharge efficiency (up to 80.9%) and the first coulombic efficiency by doping, is remarkably reduced in the irreversible capacity, and has the advantages of excellent cycle performance and rate capability, good PC (poly carbonate) consistency and high PC resistance, wherein the capacity retention ratio is above 95% after discharge cycle for 100 weeks at a high discharge rate of 10C.