350results about How to "Excellent charge and discharge characteristics" patented technology

A solid electrolyte suitable for use in all solid type lithium ion secondary battery is made by sintering a form, particularly a greensheet, comprising at least lithium ion conductive inorganic substance powder. The solid electrolyte has porosity of 20 vol % or over.

The present invention is directed to a non-aqueous electrolyte for lithium secondary battery, having both flame retardancy (self-extinguishing property) or nonflammability (having no flash point) and high conductivity and being electrochemically stable, and a lithium secondary battery using the non-aqueous electrolyte. Specifically, the non-aqueous electrolyte of the present invention comprises a non-aqueous solvent which comprises (a) at least one phosphate selected from (a1) a chain state phosphate and (a2) a cyclic phosphate as an essential component, and which may contain (b1) a cyclic carboxylate and (b2) a cyclic carbonate. Further, the non-aqueous electrolyte comprises the above non-aqueous solvent which further comprises (c1) a vinylene carbonate compound and / or (c2) a vinylethylene carbonate compound, and at least one compound selected from the group consisting of (d1) a cyclic amide compound, (d2) a cyclic carbamate compound, and (d3) a heterocyclic compound.

Silicon oxide based anode active materials are provided. In one embodiment, the active materials include silicon oxides represented by the general formula SiOx, where 0<x<0.8. The anode active materials include silicon oxides having low oxygen contents. Further, anodes and lithium batteries employing such anode active materials have excellent charge-discharge characteristics.

A solid electrolyte structure (1) for all-solid-state batteries includes a plate-like dense body (2) formed of a ceramic that includes a solid electrolyte, and a porous layer (3) formed of a ceramic that includes a solid electrolyte that is the same as or different from the solid electrolyte of the dense body (2), the porous layer (3) being integrally formed on at least one surface of the dense body (2) by firing. The solid electrolyte structure can reduce the contact resistance at the interface between the solid electrolyte and an electrode.

A lithium secondary battery includes a cathode, an anode, a separator interposed between the cathode and the anode, and a non-aqueous electrolytic solution obtained by dissolving lithium salt to a non-aqueous solvent. The separator includes a porous substrate having pores; and a porous coating layer located on at least one surface of the porous substrate and having inorganic particles and a binder polymer, the inorganic particles being connected and fixed to each other by means of the binder polymer, the porous coating layer having pores therein formed by interstitial volumes among the inorganic particles. The non-aqueous solvent is a high-viscous non-aqueous solvent having a viscosity of 1.4 cP or above at 25° C. This lithium secondary battery gives improved safety and excellent charging / discharging characteristics since it has the high-viscous non-aqueous solvent and the separator with good wettability against the solvent.

Nonaqueous electrolytic liquids for lithium secondary batteries which have flame retardancy (self-extinguishing characteristics) or incombustibility (no flash point), have a high conductivity, and are electrochemically stable. One of the nonaqueous electrolytic liquids comprises a nonaqueous solvent comprising as an essential ingredient at least one phosphate (a) selected among chain phosphoric esters (a1) and cyclic phosphoric esters (a2). The nonaqueous solvent may further contain a cyclic carboxylic ester (b1) and a cyclic carbonic ester (b2). Another nonaqueous electrolytic liquid comprises the nonaqueous solvent and incorporated therein at least either a vinylene carbonate compound (c1) or a vinylethylene carbonate compound (c2) and one or more compounds selected from the group consisting of cyclic amide compounds (d1), cyclic carbamate compounds (d2), and cyclic hetero-compounds (d3).

The method of making a composite particle for an electrode in accordance with the present invention comprises a granulating step of integrating a conductive auxiliary agent and a binder adapted to bind the conductive auxiliary agent and an electrode active material together with a particle made of the electrode active material while in close contact with each other in an inert gas atmosphere so as to form a composite particle for an electrode containing the electrode active material, conductive auxiliary agent, and binder. When the composite particle obtained by this method is used as a constituent of an electrode, an electrode having an excellent electrode characteristic and an electrochemical device having excellent electrochemical characteristics can be formed easily and reliably.

When an electrode material having a weight-average mesopore / macropore specific surface area within a specific range is used, there arises an expansion of a cell caused by the generation of decomposed gas from a component of electrolyte solution during the pre-doping process of lithium ions. A potential drop upon the pre-doping process is adjusted so as to reduce or suppress the expansion of the cell. Specifically, since the pre-doping speed is increased, the negative electrode can speedily reach the potential by which an SEI component made of lithium alkyl carbonate can be produced on the surface of the negative electrode. Consequently, the absolute amount of the gas produced by the decomposition of the electrolyte solution can be reduced, whereby the expansion of the electric storage device can be reduced.

Silicon oxide based composite anode active materials including amorphous silicon oxides are provided. In one embodiment, the amorphous silicon oxide is represented by SiOx (where 0<x<2), has a binding energy of about 103 to about 106 eV, a silicon peak with a full width at half maximum (FWHM) ranging from about 1.6 to about 2.4 as measured by X-ray photoelectron spectrometry, and an atomic percentage of silicon greater than or equal to about 10 as calculated from an area of the silicon peak. The anode active material is a composite anode active material obtained by sintering hydrogen silsesquioxane (HSQ). Anodes and lithium batteries including the anode active material exhibit improved charge and discharge characteristics.

A stacked secondary battery is formed by laying plate-shaped positive electrodes and plate-shaped negative electrodes one on the other by way of separators, wherein a collector is disposed at the front end of the end facet of each of the positive electrodes or the negative electrodes as viewed in a direction orthogonal relative to the stacking direction and has an active substance layer formed on the collector by applying slurry of particles of an active substance with a gap separating it from the front end or the electrode active substance layer is made to show a thickness varying from the front end toward the inside.

An electroactive material and a method of manufacturing the same is provided, in which the primary component of the electroactive material is a metal phosphate complex, and the electroactive material exhibits excellent charge / discharge characteristics. The electroactive material of the present invention is primarily composed of an amorphous metal complex represented by the general formula AxM(PO4)y. Here, A is an alkali metal, and M is one or two or more elements selected from the transition metals. In addition, 0≦x≦2, 0<y ≦2. The electroactive material described above can be manufactured more inexpensively and in a shorter amount of time than a conventional electroactive material which employs a crystalline metal complex, and can exhibit the same battery characteristics as the aforementioned conventional electroactive material.

A gel-type polymer electrolyte, wherein said polymer comprises (A) an ethylene-unsaturated carboxylic acid copolymer or a derivative thereof and (B) a polyalkylene oxide having a hydroxyl group at one terminal thereof or a derivative thereof, which are bonded together by an ester bond. The gel-type polymer electrolyte has a high ionic conductivity, and makes it possible to provides a cell which has excellent charge / discharge characteristics at low temperatures as well as at high temperatures.

To provide a lithium ion conductive inorganic substance that makes it possible to further enhance the charge-discharge voltage of batteries and to further improve the charge-discharge properties of batteries. The lithium ion conductive inorganic substance includes a ZrO2 component from 2.6% to 52.0% by mass on an oxide basis. The lithium ion conductive inorganic substance is preferably used for lithium ion secondary batteries that have a positive electrode layer, a negative electrode layer, and a solid electrolyte layer intervening between the positive electrode layer and the negative electrode layer.

Stabilized lithiated manganese oxide (LMO) is prepared by reacting cubic spinel lithium manganese oxide particles and particles of an alkali metal compound in air for a time and at a temperature sufficient to decompose at least a portion of the alkali metal compound, providing a treated lithium manganese oxide. The reaction product is characterized as particles having a core or bulk structure of cubic spinel lithium manganese oxide and a surface region which is enriched in Mn+4 relative to the bulk. X-ray diffraction data and x-ray photoelectron spectroscopy data are consistent with the structure of the stabilized LMO being a central bulk of cubic spinel lithium manganese oxide with a surface layer or region comprising A2MnO3, where A is an alkali metal. Electrochemical cells containing the stabilized LMO of the invention have improved charging and discharging characteristics and maintain integrity over a prolonged life cycle. The electrochemical cells are stabilized against decomposition of cell components, including electrode and electrolyte components.

To provide a power storage device with improved cycle characteristics. In the power storage device, a conductive catalyst layer is provided in contact with a surface of an active material layer formed of silicon or the like and a carbon layer is provided over the conductive catalyst layer. The carbon layer is formed by a CVD method using an effect of the catalyst layer. The carbon layer formed by a CVD method is crystalline and helps prevent an impurity such as an SEI from being attached to a surface of an electrode of the power storage device, leading to improvements in cycle characteristics of the power storage device.

The invention discloses a composite solid-state polymer electrolyte and an all-solid-state lithium battery. The composite solid-state polymer electrolyte comprises organic micro-nano porous granules, a polymer having lithium ion conducting capability and a lithium salt; the composite solid-state polymer electrolyte takes the organic micro-nano porous granules as filler; and natural compatibility exists between the organic filler and the polymer matrix. The composite solid-state polymer electrolyte disclosed by the invention has high electrochemical window (4.2-5V), excellent interface stability with a lithium-based negative electrode material, and low interface impedance. The all-solid-state lithium battery, assembled by the composite solid-state polymer electrolyte disclosed by the invention, is high in cycling performance and rate capability.

An object of the present invention is to provide a binder resin composition which exhibits excellent adhesion to the negative electrode current collector and an excellent resistance to liquid electrolyte-induced swelling, and which provides an electrode having excellent flexibility and plasticity. Additional objects of the present invention are to provide, through the use of this binder resin composition, an electrode for nonaqueous electrolyte energy devices and a nonaqueous electrolyte energy device, which exhibit a high capacity as well as a smaller capacity fading during charge-discharge cycling. A binder resin composition for a nonaqueous electrolyte energy device electrode comprises a copolymer that contains a repeat unit derived from a nitrile group-containing monomer; a repeat unit derived from a monomer represented by Formula (I) (wherein R1 is H or CH3; R2 is H or monovalent hydrocarbonyl group; and n is an integer from 1 to 50) and / or a repeat unit derived from a monomer represented by Formula (II) (wherein R3 is H or CH3 and R4 is hydrogen or C4-100 alkyl); and optionally a repeat unit derived from a carboxyl group-containing monomer.

The invention relates to a nonaqueous electrolytic solution comprising an electrolyte and a nonaqueous solvent, the nonaqueous electrolytic solution comprising a specific compound.

A nonaqueous electrolyte for a secondary battery is disclosed which contains at least 10% by volume of methyl difluoroacetate, based on a total volume of a solvent. The nonaqueous electrolyte uses, as a mixed solute, at least one A electrolyte salt selected from LiPF6 and LiBF4 and at least one B electrolyte salt selected from LiN(ClF2l+1SO2)(CmF2m+1SO2) (wherein l and m independently indicate an integer of at least 0) and LiC(CpF2p+1SO2)(CqF2q+1SO2)(CrF2r+1SO2) (wherein p, q and r independently indicate an integer of at least 0).

This invention provides a high-power secondary battery using a polymer electrolyte, a positive electrode, and a negative electrode. Such secondary battery comprises a positive electrode comprising a positive electrode active material that deintercalates and intercalates cations, a negative electrode comprising a negative electrode active material that intercalates and deintercalates cations deintercalated from the positive electrode, and an electrolytic layer comprising an ion conductive polymer that mediates between the positive electrode and the negative electrode and allows the cations to migrate, wherein the positive or negative electrode comprises an organic boron-containing compound as a binder component and the positive and / or negative electrode active material is treated with silane or aluminum.

An object is to provide graphene which has high conductivity and is permeable to ions of lithium or the like. Another object is to provide, with use of the graphene, a power storage device with excellent charging and discharging characteristics. Graphene having a hole inside a ring-like structure formed by carbon and nitrogen has conductivity and is permeable to ions of lithium or the like. The nitrogen concentration in graphene is preferably higher than or equal to 0.4 at. % and lower than or equal to 40 at. %. With use of such graphene, ions of lithium or the like can be preferably made to pass; thus, a power storage device with excellent charging and discharging characteristics can be provided.

An organic electrolytic solution includes a lithium salt; an organic solvent containing a high dielectric constant solvent and / or a low boiling point solvent; and a glycidyl ether compound represented by Formula 1:where, n, R1, R2, R3, R4, R5, R6 and A are described in the detailed description. In conventional organic electrolytic solutions, irreversible capacity is increased due to decomposition of a polar solvent. A lithium battery employing the organic electrolytic solution has excellent charge / discharge characteristics by inhibiting cracks of a negative electrode active material which occur during charging and discharging of the battery. Therefore, the lithium battery can have high stability, reliability and charge / discharge efficiency.

[Solution] With respect to a nonaqueous electrolyte solution for secondary batteries containing an electrolyte, a solvent and an additive, and a nonaqueous electrolyte secondary battery which is provided with the nonaqueous electrolyte solution, the additive contains a compound represented by formula (I). (In formula (I), n represents an integer of 1-4; R1 represents a halogen atom or the like if n = 1, represents an alkaline earth metal atom or the like if n = 2, represents a trivalent transition metal atom or the like if n = 3, and represents a tetravalent transition metal atom or the like if n = 4; and R2 represents an alkylene group having 1-6 carbon atoms or an alkenylene group having 2-6 carbon atoms.) [Effect] A nonaqueous electrolyte secondary battery using a nonaqueous electrolyte solution for secondary batteries according to the present invention has high low-temperature characteristics, while having high high-temperature characteristics.

The invention discloses a novel lithium-pre-intercalated negative plate and a preparation method thereof. The novel lithium-pre-intercalated negative plate comprises a porous current collector, an active material layer and a lithium pre-intercalation layer, wherein the lithium pre-intercalation layer is attached to the active material layer; the active material layer is prepared from the following components represented by mass percentage: 75%-90% of an active material, 5%-20% of a conductive agent and 5%-10% of a binder; the active material is a lithium-intercalated carbon material; the lithium pre-intercalation layer is a dense and uniform composite thin-film layer of which the thickness is 5-30 microns; the lithium pre-intercalation layer is prepared from the following components represented by mass percentage: 50%-70% of graphite and 30%-50% of a lithium salt; and the lithium pre-intercalation layer is obtained by magnetron sputtering coating on the active material layer. The novel lithium-pre-intercalated negative plate disclosed by the invention is high in lithium-pre-intercalated quantity, high in adhesion to the active material layer and uniform in lithium intercalation, is achieved through magnetron sputtering coating, and is safe and time-saving; and the lithium-pre-intercalated quantity can be controlled.

The invention belongs to the field of materials of lithium ion batteries, and particularly relates to a negative electrode of the lithium ion battery and a preparation method thereof. The negative electrode of the lithium ion battery comprises a current collector and negative electrode paste for coating the current collector, wherein the negative electrode paste comprises the following dry ingredients by weight percent: 92-99% of active material and 1-8% of an adhesive; the active material is graphite or graphite alloy; the adhesive is waterborne multi-component copolymerization emulsion. The waterborne multi-component copolymerization emulsion is used for replacing conventional butadiene styrene rubber and serves as the adhesive for the lithium ion battery, so that the more excellent adhesive performance is realized in comparison with the adhesive performance of a conventional adhesive, and meanwhile, the prepared battery has prominently excellent performances such as good low temperature characteristics, low circulation expansion rate, good long cycling performance and relatively excellent processing characteristics; the negative electrode prepared by using the method has relatively small impedance and relatively good dynamic performance and is capable of effectively solving the problem of risk of separation of lithium in the lithium ion battery at low temperature; the prepared battery has the characteristics of safety, reliability and long cycle life.

The invention relates to an FFS (Free Fall Sensor) type TFT-LCD (Thin Film Transistor-Liquid Crystal Display) array substrate and a manufacture method thereof. The array substrate comprises a grid line, a first data line and a second data line which are formed on the substrate and limit a pixel area, wherein a common electrode, a first TFT, a second TFT, a first pixel electrode and a second pixelelectrode are formed in the pixel area; the first data line provides a first data signal to the first pixel electrode through the first TFT; the second data line provides a second data signal to the second pixel electrode through the second TFT; the first data signal and the second data signal have opposite relative polarities; and the first pixel electrode and the second pixel electrode are alternately arranged. The invention improves the equality of an electric field and has higher whole transmissivity in one aspect, improves the strength of a horizontal electric field in the other aspect, has favorable charging and discharging characteristics of the pixel electrodes, not only can improve the driving efficiency and the panel transmissivity, but also is favorable to power consumption reduction and afterimage elimination.

The present invention relates to a high-voltage electric double layer capacitor (EDLC), and more particularly, to an EDLC in which a surge voltage and an operating voltage are enhanced by improving the structure of a unit cell. The EDLC according to the present invention includes a unit cell having at least three electrodes. According to a preferred embodiment of the present invention, the unit cell has a structure constructed by sequentially laminating a first insulating paper layer with a sheet of insulating paper, a first electrode layer with at least two electrodes, a second insulating paper layer with a sheet of insulating paper, and a second electrode layer with at least one electrode. In accordance with the present invention, the number of electrode-facing surfaces increases, and a surge voltage and an operating voltage increase in proportion to the increased number of the electrode-facing surfaces, resulting in a high energy storage density. Accordingly, the present invention has advantages in that an EDLC with a single cell can be applied to products, an EDLC module can be miniaturized, and there is no need for a protection circuit for maintaining voltage balance on a unit cell basis upon fabrication of the module.

Silicon oxide based composite anode active materials including amorphous silicon oxides are provided. In one embodiment, the amorphous silicon oxide is represented by SiOx (where 0<x<2), has a binding energy of about 103 to about 106 eV, a silicon peak with a full width at half maximum (FWHM) ranging from about 1.6 to about 2.4 as measured by X-ray photoelectron spectrometry, and an atomic percentage of silicon greater than or equal to about 10 as calculated from an area of the silicon peak. The anode active material is a composite anode active material obtained by sintering hydrogen silsesquioxane (HSQ). Anodes and lithium batteries including the anode active material exhibit improved charge and discharge characteristics.

Positive electrode active material particles that inhibit a decrease in capacity due to charge and discharge cycles are provided. A high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, or a highly-safe or highly-reliable secondary battery is provided. A novel material, active material particles, and a storage device are provided. The positive electrode active material particle includes a first region and a second region in contact with the outside of the first region. The first region contains lithium, oxygen, and an element M that is one or more elements selected from cobalt, manganese, and nickel. The second region contains the element M, oxygen, magnesium, and fluorine. The atomic ratio of lithium to the element M (Li / M) measured by X-ray photoelectron spectroscopy is 0.5 or more and 0.85 or less. The atomic ratio of magnesium to the element M (Mg / M) is 0.2 or more and 0.5 or less.

An electrical storage device includes a cathode, an anode, a protective film that is provided between the cathode and the anode, and an electrolyte solution, the protective film including a polymer that includes a repeating unit derived from a fluorine-containing monomer, and a repeating unit derived from an unsaturated carboxylic acid.