41results about How to "Excellent input and output characteristics" patented technology

A positive active material for a lithium-ion secondary battery includes a lithium composite oxide particle containing nickel atoms, manganese atoms, and fluorine atoms. The lithium composite oxide particle includes a particle center portion and a surface layer portion that is closer to a surface of the lithium composite oxide particle than the particle center portion is. A fluorine atom concentration Fc (at %) of the particle center portion measured by energy dispersive X-ray spectroscopy is lower than a fluorine atom concentration Fs (at %) of the surface layer portion.

According to one embodiment, there is provided an active material. The active material includes secondary particles. The secondary particles include first primary particles and second primary particles. The first primary particles include an orthorhombic Na-containing niobium-titanium composite oxide. The second primary particles include at least one selected from the group consisting of a carbon black, a graphite, a titanium nitride, a titanium carbide, a lithium titanate having a spinel structure, a titanium dioxide having an anatase structure, and a titanium dioxide having a rutile structure.

Provided is a non-aqueous electrolyte secondary battery combining excellent input/output performance with great durability (cycle characteristics) and an assembly thereof. The present invention provides a non-aqueous electrolyte secondary battery assembly. The positive electrode has a maximum operating voltage of 4.3 V or higher relative to lithium metal, comprising a positive electrode active material and an ion-conductive inorganic phosphate compound. The non-aqueous electrolyte solution comprises a supporting salt, an oxalatoborate-type compound, and a non-aqueous solvent. The non-aqueous solvent is formed of a non-fluorinated solvent. This invention also provides a non-aqueous electrolyte secondary battery obtained by charging the non-aqueous electrolyte secondary battery assembly.

A lithium secondary battery 10 of the present invention is a secondary battery provided with a positive electrode 30 having a positive electrode active material layer 34 on a positive electrode collector 32, and a negative electrode 50 having a negative electrode active material layer 54 on a negative electrode collector 52. The positive electrode active material layer 34 contains a positive electrode active material capable of reversibly storing and releasing lithium ions. The negative electrode active material layer 54 contains a negative electrode active material made up of lamellar graphite that is bent so as to have an average number of bends f per particle of 0<f≦3, and an average aspect ratio of 1.8 or higher. In a cross-section perpendicular to the surface of the negative electrode collector 52, the negative electrode active material is oriented in such a manner that the perpendicularity defined as n2/n1, is 1 or greater, n1 being the number of negative electrode active material units such that 0°≦θn≦30°, and n2 being the number of negative electrode active material units such that 60°≦θn≦90°, where θn is the angle formed by a major axis of the negative electrode active material units with respect to the surface of the negative electrode collector 52.

A positive electrode of a nonaqueous secondary battery has a positive electrode active material including at least one selected from lithium metal complex oxides having a layered rock salt structure, lithium metal complex oxides having a spinel structure, and polyanion based materials. The electrolytic solution contains a metal salt whose cation is an alkali metal, an alkaline earth metal, or aluminum, and an organic solvent having a heteroelement. Regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum of the electrolytic solution, when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is; Is>Io is satisfied. The nonaqueous secondary battery may have a usage maximum potential of the positive electrode of not lower than 4.5 V when Li/Li⁺ is used for reference potential.

Disclosed are: a positive electrode which contains lithium-containing nickel oxide as a positive electrode active material and has excellent input/output characteristics, excellent durability and excellent reliability; and a lithium ion battery which uses the positive electrode. The positive electrode comprises a positive electrode collector and a positive electrode active material layer that is formed on the surface of the positive electrode collector. The positive electrode active material layer contains a lithium-containing nickel oxide represented by general formula (1): LixNi1-(p+q+r)CopAlqMrO2+y (wherein M represents a transition element (excluding Ni and Co) or the like; and 0.8 = x = 1.4 and 0 < (p + q + r) = 0.7) and lithium carbonate, and has a high lithium carbonate concentration region and a low lithium carbonate concentration region. The high concentration region occupies 2-80% of the total thickness of the positive electrode active material layer from the surface thereof, while the low concentration region occupies the rest on the positive electrode collector side.

A manufacturing method of a lithium ion secondary battery includes: forming a first mixture by mixing powder of a first electrode material, which is one of the active material and the conductive material, with powder of trilithium phosphate; forming a second mixture by mixing the first mixture with powder of a second electrode material which is the other one of the active material and the conductive material; forming a wet granulated body by mixing the second mixture with the binder and a solvent; and forming the active material layer by attaching the wet granulated body to the surface of the current collector foil.

A cathode material for a lithium-ion secondary battery including: granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 0.90 μm or more and 2.00 μm or less, particle diameters of 90% or more of the granulated bodies are 0.25 μm or more and 3.50 μm or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from said plurality of diameters is considered as a particle diameter of each of the granulated bodies.

A cathode material for a lithium-ion secondary battery including: active material particles including central particles represented by general formula LixAyDzPO4 (here, A represents at least one element selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr, D represents at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, and Y, 0.9<x<1.1, 0<y≤1, 0≤z<1, and 0.9<y+z<1.1) and a carbonaceous film that coats surfaces of the central particles, wherein, when a mixture of the active material particles, a conductive auxiliary agent and a binder in which a mixing ratio thereof is 94:1:5 in terms of a mass ratio is dissolved in a solvent to form paste having a total solid content amount of 45% by mass, a viscosity of the past is 5,000 mPa·s or less at a shear rate of 4.0 [l/s].

The present invention provides a method for producing a nonaqueous alkali metal electricity storage element, which comprises a voltage application step wherein a voltage is applied to a nonaqueous alkali metal electricity storage element precursor in which a positive electrode precursor, a negative electrode, a separator and a nonaqueous electrolyte solution are contained in an outer case. With respect to this method for producing a nonaqueous alkali metal electricity storage element, a positive electrode active material layer of the positive electrode precursor contains a positive electrode active material and an alkali metal compound other than the positive electrode active material; and (1) a pressure is applied to the precursor from the outside before or during the voltage application step; (2) the precursor is heated before or during the voltage application step; (3) in the voltage application step, constant-current charging of the precursor is performed, and constant-voltage charging of the precursor is subsequently performed; (4) the C-rate of the constant-current charging is 1.0 to 100.0 times the discharge capacity (Ah) of the thus-obtained nonaqueous alkali metal electricity storage element; and (5) the voltage value of the constant-voltage charging is 4.20 V or more.

The present invention provides a nonaqueous electrolyte secondary battery configured such that a positive electrode, a negative electrode, and a nonaqueous electrolyte are accommodated in a battery case. The battery includes lithium bis(oxalato)borate (LiBOB) at least at the time of assembly of the battery. The negative electrode includes a film derived from the LiBOB and containing a boron atom (B) and a carbonate ion (CO₃²⁻). A ratio (mc/mb) of a molar content mc of the carbonate ion to a molar content mb of the boron atom is 4.89 or less. In a preferred aspect, when a molar content A of the LiBOB is A (mmol) and a remaining space volume in the battery case is V (cm³) at the time of the assembly, a ratio A/V is 0.053 or less.

The invention discloses a wireless transmitter power supply current sharing controller and method based on a current source, and the controller comprises a power frequency power grid, an AC LC filter, a first current source module, a second current source module, a DC reactor, a transmitter load, a voltage sensor, a first current sensor, a phase-locked loop, a first PI controller, a second current sensor, a first low-pass filter, a second PI controller, a third PI controller, a fourth PI controller, a fifth PI controller, a third current sensor, a second low-pass filter, a sixth PI controller, an SVPWM modulation module, an adder and a subtracter. Current sharing control of the two current source modules can be realized. According to the method, enumeration and selection of space vectors are avoided, so that the method can be conveniently applied to current sharing of any current source modules connected in parallel, and the method has good expandability.