45results about How to "Excellent charge-discharge cycle characteristics" patented technology

A lithium ion conductive solid electrolyte includes an ion conductive inorganic solid and, in a part or all of the pores of the inorganic solid, a material of a composition which is different from the composition of the inorganic solid exists. A method for manufacturing this lithium ion conductive solid electrolyte includes a step of forming an ion conductive inorganic solid to a predetermined form and a step of thereafter filling a material of a composition which is different from the composition of the inorganic solid in pores of the inorganic solid.

At least two metallic materials containing element such as silicon and tin, which has ability of insertion and desertion of lithium element, and optionally another metallic material containing element such as copper are molten to prepare a melt. The melt is rapidly cooled by strip-cast method at a cooling rate of more than 2x103 ° C. / sec and no more than 104 ° C. / sec to be cast. Further, the cast is milled and classified into alloy powder having an average particle size of 0.1 mum to 50 mum. The alloy powder and conductive agent are laminated with binder onto a collector to obtain a negative electrode for a secondary battery. The negative electrode is employed to obtain a lithium secondary battery having high electric charge and discharge capacity, and good property of charge and discharge cycle.

A positive electrode material for a nonaqueous electrolyte secondary battery is obtained which attains good thermal stability and high discharge capacity and shows satisfactory charge-discharge cycle performance characteristics. A nonaqueous electrolyte secondary battery using the positive electrode material is also obtained. Characteristically, the positive electrode material for a nonaqueous electrolyte secondary battery contains a positive active material (e.g., lithium-containing layered complex oxide) capable of lithium storage and release, a lithium phosphate compound such as Li3PO4, and Al2O3. The lithium phosphate compound and Al2O3 are preferably disposed near the positive active material.

A lithium secondary battery is provided with the following components: an anode which is provided with an anode mixture layer on one surface or two surfaces of a collector, wherein the anode mixture layer comprises a lithium-containing composite oxide which comprises lithium and transition metal and at least one part of the anode mixture layer is the lithium-containing composite oxide that comprises nickel as the transition metal, and the lithium-containing composite oxide is used as an anode active material; a cathode; and a separator plate in which nonaqueous electrolyte that comprises 0.5-5wt% of halogen-substituted cyclic carbonate. At a side part of the battery housing, a breaking groove which breaks on condition that the pressure in the battery housing is larger than a threshold value in a manner of crossing with a diagonal line when viewed from the wide breadth side.

A material of negative electrode for lithium secondary battery, comprising base material particles having either an A-phase composed mainly of silicon or a mixed phase of the A-phase and a B-phase consisting of an intermetallic compound of transition metal element and silicon, wherein the A-phase and mixed phase are microcrystalline or amorphous, and wherein a carbon material adheres to part of the surface of the base material particles while the rest of the surface is coated with a film containing silicon oxide. The lithium secondary battery having this material of negative electrode for lithium secondary battery applied thereto excels in charge discharge cycle characteristics, being reduced in irreversible capacity, and has a capacity strikingly higher than that of the lithium secondary battery utilizing conventional carbon material in the negative electrode material.

In a non-aqueous electrolyte secondary battery, a positive electrode active material includes a carbon-coated lithium vanadium phosphate and a lithium nickel composite oxide. A negative electrode active material includes a carbon-based active material capable of intercalating and deintercalating lithium ions. When a first charge capacity of a negative electrode per unit area is x (mAh / cm 2 ), and a first charge capacity of a positive electrode per unit area is y (mAh / cm 2 ), a relation of x and y satisfies 0.6 y / x 0.92.

A negative electrode material for a non-aqueous electrolyte secondary battery of the present invention is a negative electrode material for a non-aqueous electrolyte secondary battery capable of reversibly absorbing and desorbing lithium, and it includes a solid phase A and a solid phase B that have different compositions and has a structure in which the surface around the solid phase A is entirely or partly covered by the solid phase B. The solid phase A contains at least one element selected from the group consisting of silicon, tin and zinc, and the solid phase B contains the above-described at least one element contained in the solid phase A, and at least one element selected from the group consisting of Group IIA elements, transition elements, Group IIB elements, Group IIIB elements and Group IVB elements. The atomic arrangement and structure (e.g., crystal structure or amorphous structure) of at least one solid phase selected from the group consisting of the solid phase A and the solid phase B are controlled. It is possible to provide a negative electrode material for a non-aqueous electrolyte secondary battery in which deterioration due to charge / discharge cycle characteristics is suppressed, by using such a material as a negative electrode material for a non-aqueous electrolyte secondary battery. It is also possible to provide a non-aqueous electrolyte secondary battery having excellent charge / discharge cycle characteristics, by including such a negative electrode material for a non-aqueous electrolyte secondary battery.

A negative electrode for a non-aqueous electrolyte secondary battery in the present invention includes an active material including Si, a conductive material, and a binder. The binder is polyimide and polyacrylic acid, and the conductive material is a carbon material.

This composite material for electrodes contains: a plant-derived porous carbon material that has a pore volume of 0.1 cm3 / gram or more as determined by an MP method, or alternatively, a pore volume of pores less than 100 nm of 0.3 cm3 / gram or more as determined by a BJH method; and lithium sulfide that is supported by the pores of the porous carbon material. This composite material for electrodes has a pore volume of less than 0.1 cm3 / gram as determined by an MP method, or alternatively, a pore volume of pores less than 100 nm of less than 0.3 cm3 / gram as determined by a BJH method.

An electrode material is provided. The electrode material includes a porous carbon material, wherein the porous carbon material has a half-width of diffraction intensity peak of a (100) face or a (101) face of 4 degrees or less with reference to a diffraction angle 2 theta on a basis of an X-ray diffraction method. An absolute value of a differential value of mass can be obtained when a mixture of the porous carbon material and S8 sulfur mixed at a mass ratio of 1:2 is subjected to thermal analysis, where temperature is employed as a parameter, has a value of more than 0 at 450° C. and a value of 1.9 or more at 400° C. A battery and method of manufacture are also provided.

A silicon / carbon composite or a silicon alloy / carbon composite is formed with a homogeneous silicon-containing thin film or silicon-containing alloy thin film on the surface of a conductive carbon material, where the composite may be used for a large-capacity electrical storage device when used as a negative electrode material for forming an electrical storage device negative electrode, and exhibits excellent charge-discharge cycle characteristics. A carbon-containing thin film is formed on a surface of a conductive carbon material by chemical vapor deposition (CVD) that utilizes a carbon-containing gas and a silicon-containing thin film or a silicon-containing alloy thin film is formed on the conductive carbon material by chemical vapor deposition (CVD) that utilizes a silicon-containing gas alone, or utilizes a silicon-containing gas and a carbon-containing gas.

The present invention provides a negative electrode, which includes: a negative electrode current collector; a first protrusion, which is arranged to extend from the surface of the negative electrode current collector to the outside of the negative electrode current collector, and forms a peeling on at least a part of the surface Propagation preventing part; a negative electrode active material layer, which contains a negative electrode active material, and is provided on at least the top surface of the first convex part. According to this configuration, the peeling of the negative electrode active material layer from the negative electrode current collector and the accompanying reduction in current collection performance can be suppressed, and further deformation of the negative electrode itself can be suppressed. The lithium ion secondary battery containing the negative electrode has high battery capacity and energy density, excellent charge and discharge cycle characteristics, and can continue to perform high output stably for a long time.

Provided is a lithium secondary battery comprising an anode mix including a silicon- or tin-based material as an anode active material, and as a binder, a photo-polymerizable material composed of one or more monomers selected from the group consisting of an epoxy derivative, polyester acrylate and epoxy acrylate, or oligomers or polymers thereof, wherein an anode can be prepared within a short period of time via a simplified manufacturing process by applying the anode mix to a current collector and polymerizing the applied anode mix with light-irradiation, and further, superior charge / discharge cycle characteristics of the battery are provided due to stable maintenance of binding between active materials and between the active material and current collector, regardless of significant volume changes of the anode active material occurring upon charging / discharging the battery.

To provide a positive electrode for a nonaqueous electrolyte secondary battery having excellent flexibility and capable of increasing the reliability and productivity, and a nonaqueous electrolyte secondary battery using the positive electrode. The positive electrode for a nonaqueous electrolyte secondary battery includes an active material layer that contains: a positive-electrode active material; a binder made of a fluorine-contained resin containing a vinylidene fluoride unit; and an electrolyte represented by one of the following general formulae (1) and (2): wherein M represents a metal element, R1 and R2 each represent fluorine or a fluorinated alkyl group having one to three carbon atoms and are identical to or different from each other, and n represents an integer of 1 to 3; wherein M represents a metal element, R3 represents a fluorinated alkylene group having two to four carbon atoms, and n represents an integer of 1 to 3.

It is possible to form a secondary cell having excellent charge-discharge cycle properties and to improve dispersibility of the active substance and the auxiliary conductor and pliability and close adhesion of the electrodes by using a composition for forming a secondary cell electrode that comprises at least one of an electrode active substance (A) and a carbon material (B) that serves as an auxiliary conductor, a water-soluble additive (C) that is a water-soluble additive formed from carbon atoms, oxygen atoms, and hydrogen atoms and that has 2 to 20 oxygen atoms per 1 molecule, and water (D).

The invention provdies a positive electrode active material including lithium- ithium transition metal complex oxide which contains lithium, a main transition metal M1 and metal element M2 different from the main transition metal M1, wherein the metal element M2 has a concentration gradient from the particle center toward a particle surface. Within a range where a ratio d(%) from the particle surface to a prescribed depth(=[(mass of main transition metal M1)+(mass of metal element M2)] / (particle all mass)) satisfies a relation of 0.020%<=d<=0.050%, a mole fraction r (=(material amount of metal element M2) / [(material amount of main transition metal M1)+(material amount of metal element M2)]) is within a range of 0.20<=r<=0.80. The main transition metal M1 is selected from at least one of nickel (Ni), cobalt (Co) and manganese (Mn), and the main transition metal M1 is selected from at least one of the manganese (Mn), magnesium (Mg), aluminum (Al), nickel (Ni), boron (B), titanium (Ti), cobalt (Co) and iron (Fe).

In the cathode of the invention, a cathode current collection body contains a flaky base material part and a plurality of banquettes, wherein the banquettes are arranged on the surface of the base material part. A cathode active substance layer contains a column-shaped active substance layer having alloy series cathode active substance, and a stacking active substance layer. The column-shaped active substance layer contains a plurality of column-shaped bodies extending from the banquette surface outwards. The stacking active substance layer is formed by stacking films in crenellate mode on the base material part surface between two neighboring banquettes. By using the cathode, it is capable of restraining the deformation of the cathode and preventing the cathode active substance layer from peeling from the cathode current collection body, thus a lithium ion secondary battery having characteristics of excellent charge / discharge circle performance and output horsepower is obtained.