Hitachi Metals, Ltd.

Proterial, Ltd.

Hitachi, Ltd.

Mitsui Chemicals Tohcello, Inc.

Tatsuya Toyama

Shin Takahashi

Hisato Tokoro

Akira Gunji

Shuichi Takano

Takashi Nakabayashi

Genei Nakajima

Hiroshi Haruna

Daiko Takamatsu

Kazushige Kohno

Akihiko Noie

Xiaoliang Feng

Sho Furutsuki

Atsushi Okamoto

Hiroyuki Wakaki

Akio Takeuchi

Tsutomu Kubota

Masayuki Sakurai

A packaging body configured with a packaging film, in which the outermost layer is a polyethylene-based resin layer and the polyethylene-based resin layer is uniaxially or biaxially stretched.

Packaging body

The present invention is to provide a cathode active material used for a lithium ion secondary battery which has a large charge-discharge capacity, and excels in charge-discharge cycle properties, output properties and productivity, and, a lithium ion secondary battery using the same. The cathode active material used for a lithium ion secondary battery comprises a lithium transition metal composite oxide represented by the following Formula (1); LiNiCoMnMO, where, in the formula (1), M is at least one metal element other than Li, Ni, Co, and Mn; and a, b, c, d, e, and α satisfy the following conditions: −0.04≤a≤0.04, 0.80≤b<1.00, 0≤c≤0.04, 0<d<0.20, b+c+d+e=1, −0.2<α<0.2, and c and d in the Formula (1) satisfy c/d≤0.75.

Cathode active material used for lithium ion secondary battery and lithium ion secondary battery

A method for manufacturing a cathode active material for a lithium ion secondary battery comprises mixing lithium carbonate and a compound containing a metal element other than Li, and a firing step. The firing step includes at last two stages of controlling firing to different temperatures. The at least two stages include controlling a firing temperature to a lower temperature and controlling a firing temperature to a higher temperature. The firing is controlled is such that the former stage has a lower oxygen concentration in an atmosphere than the latter stage. The firing apparatus comprises at least two firing furnaces of controlling firing temperatures to different temperatures. The at least two firing furnaces include controlling a firing temperature to a lower temperature and controlling firing temperature to a higher temperature. The latter firing furnace has a gas outlet being in communication with the former firing furnace.

Method and firing apparatus for manufacturing cathode active material for lithium ion secondary battery

Provided is a cathode active material for a lithium ion secondary battery in which the secondary particles constituting the powder have a high breaking strength and a good coatability, and a method for manufacturing same. The cathode active material for a lithium ion secondary battery includes a primary particle of a lithium composite compound; and secondary particles formed by an aggregation of primary particles, wherein a ratio between an average particle size of the primary particles and an average particle size of the secondary particles is 0.006 or more and 0.25 or less, an amount of lithium carbonate is 0.4% by mass or less, and a breaking strength of the secondary particles is 30 MPa or more.

Cathode active material for lithium ion secondary battery, method for manufacturing cathode active material for lithium ion secondary battery, and lithium ion secondary

The present invention is to provide a cathode active material used for a lithium ion secondary battery which has a large charge-discharge capacity, and excels in charge-discharge cycle properties, output properties and productivity, and, a lithium ion secondary battery using the same. The cathode active material used for a lithium ion secondary battery comprises a lithium-transition metal composite oxide having an &#x3b1;-NaFeOtype crystal structure and represented by the following formula (1); LiNiCoMO, where, in the formula (1), M is at least one metal element other than Li, Ni and Co; and a, b, c, d and a are respectively numbers satisfying &#x2212;0.04&#x2264;a&#x2264;0.04, 0.80&#x2264;b&#x2264;1.0, 0&#x2264;c&#x2264;0.06, b+c+d=1, and &#x2212;0.2&#x3c;&#x3b1;&#x3c;0.2, and an a-axis lattice constant of the crystal structure is 2.878&#xd7;10m or more.

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: LiNiMnCoTiMO, and has an atomic ratio Ti/Tibetween Tiand Ti, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and a are numbers satisfying &#x2212;0.1&#x2264;a&#x2264;0.2, 0.7&#x3c;b&#x2264;0.9, 0&#x2264;c&#x3c;0.3, 0&#x2264;d&#x3c;0.3, 0&#x3c;e&#x2264;0.25, 0&#x2264;f&#x3c;0.3, b+c+d+e+f=1, and &#x2212;0.2&#x2264;&#x3b1;&#x2264;0.2.

Positive-electrode material for lithium ion secondary battery, method for producing the same, and lithium ion secondary battery

A compound having a layered structure that is used for a positive electrode active material for a lithium ion secondary battery achieves both a high energy density and a high cyclability. The positive electrode active material for a lithium ion secondary battery contains a compound having a layered structure belonging to a space group R-3m, in which the compound having a layered structure is represented by a compositional formula: LiM1Owherein M1 represents a metal element or metal elements other than Li, and contains at least Ni, &#x2212;0.03&#x2264;a&#x2264;0.10, and &#x2212;0.1&#x3c;&#x3b1;&#x3c;0.1, a proportion of Ni in M1 is larger than 70 atom %, and a site occupancy of a transition metal or transition metals at a 3a site obtained by structural analysis by a Rietveld method is less than 2%, and a content of residual lithium hydroxide in the positive electrode active material is 1 mass % or less.

Positive electrode active material for lithium ion secondary battery, manufacturing method thereof, and lithium ion secondary battery

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: LiNiMnCoTiMO, and has an atomic ratio Ti/Tibetween Tiand Ti, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and &#x3b1; are numbers satisfying &#x2212;0.1&#x2264;a&#x2264;0.2, 0.7&#x3c;b&#x2264;0.9, 0&#x2264;c&#x3c;0.3, 0&#x2264;d&#x3c;0.3, 0&#x3c;e&#x2264;0.25, 0&#x2264;f&#x3c;0.3, b+c+d+e+f=1, and &#x2212;0.2&#x2264;&#x3b1;&#x2264;0.2.

Provided are a cathode active substance used for a lithium ion secondary battery capable of suppressing an increase in an internal resistance inside the battery caused following charge/discharge cycles, a cathode including the cathode active substance, and a lithium ion secondary battery provided with the cathode. The cathode active substance includes a lithium composite compound represented by Formula: LiNiCoMMO. When Pi is defined as porosity with respect to an opening diameter of 0.6 &#x3bc;m or less and measured by subjecting the active substance to a mercury press-in method, and Pp is defined as porosity with respect to the same diameter and measured by filling the active substance in a mold with an inner diameter of 10 mm, pressing the filled substance by a load of 40 MPa, and subjecting the pressed substance to the same method, a value of Pp/Pi is 1.5 or less.

Cathode active substance used for lithium ion secondary battery, cathode including same, and lithium ion secondary battery provided with cathode

Provided are a cathode active material used for a lithium ion secondary battery capable of sufficiently realizing both high charge/discharge capacities and excellent cycle properties, and a lithium ion secondary battery using the cathode active material. The cathode active material contains a plurality of secondary particles formed via agglomeration of a plurality of primary particles of a lithium transition metal composite oxide. Spreading resistance distributions of the secondary particles respectively observed in cross-sections at optional three positions of the cathode active material are measured so as to afford average values of spreading resistance of the secondary particles in the respective cross-sections. The average values of spreading resistance of the secondary particles are further averaged. The resultant averaged value of spreading resistance is made to enter the range of 1.0&#xd7;10&#x3a9;/cm or more and 1.0&#xd7;10&#x3a9;/cm or less.

Cathode active material used for lithium ion secondary battery and lithium ion secondary battery using same

A positive electrode active material includes a primary particle represented by Compositional Formula (1):NiCoMO&#x2003;&#x2003;(1),where x is a number satisfying a relation represented by an expression &#x2212;0.12&#x2264;x&#x2264;0.2; y is a number satisfying a relation represented by an expression 0.7&#x2264;y&#x2264;0.9; z is a number satisfying a relation represented by an expression 0.05&#x2264;z&#x2264;0.3; and M is at least one element selected from the group consisting of Mg, Al, Ti, Mn, Zr, Mo, and Nb; or a secondary particle into which the primary particle aggregates. The primary particle or the secondary particle includes a free lithium compound in a weight proportion of 0.1% or more and 2.0% or less, and the weight of lithium hydroxide in the free lithium compound is 60% or less of the weight of lithium carbonate in the free lithium compound.

Positive electrode active material for lithium ion secondary battery, and positive electrode for lithium ion secondary battery and lithium ion secondary battery comprising the same

Positive-electrode material for lithium ion secondary battery, method and producing the same, and lithium ion secondary battery

A current collector for a lithium ion secondary battery, on which an electrode mixture layer is formed, satisfies A&#x2265;0.10 &#x3bc;m and 6&#x2264;(B/A)&#x2264;15 when assuming that a three-dimensional center plane average roughness SRa of a surface of at least one side of the current collector on which the electrode mixture layer is formed is A and a ratio of an actual surface area of the surface of at least one side of the current collector to a geometric area of the surface of at least one side of the current collector, which is (actual surface area)/(geometric area), is B.

Current collector for lithium ion secondary batteries and positive electrode for lithium ion secondary batteries

A cathode material for a lithium secondary battery capable of stably suppressing manganese dissolution even under high temperature and voltage conditions is provided. Further, by using the cathode material for a lithium secondary battery, a lithium secondary battery excellent in a charge/discharge cycle profile at a high temperature and a secondary battery module equipped with the battery are provided. The cathode material for a lithium secondary battery comprises a lithium manganese composite oxide and a coating layer formed on the surface of the lithium manganese composite oxide. The coating layer includes an oxide compound or a fluoride compound each containing M (wherein, M is at least one element selected from the group of Mg, Al and Cu), and a phosphorous compound. An atomic density of M at the side of the lithium manganese composite oxide in the coating layer is higher than an atomic density of M at the side of a surface layer of the coating layer facing to the electrolyte.

Cathode material for lithium secondary battery, lithium secondary battery, and secondary battery module using the battery

To provide a lithium secondary battery excellent in the life characteristic and the power density. A lithium secondary battery, comprising: a positive electrode capable of intercalating and deintercalating lithium; and an negative electrode capable of intercalating and deintercalating lithium, wherein the positive electrode contains a manganese-containing positive electrode active material of a spinel structure and an oxide that coats the surface of this positive electrode active material, wherein the oxide contains a metallic element, wherein the metallic element forms a solid solution with the positive electrode active material, and wherein the atomic concentration of the metallic element is approximately 0 at depths of from 50 to 100 nm from an external surface of the negative electrode.

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Tokyo, Japan

Tatsuya Toyama