Sanyo Electric Co., Ltd.

Panasonic Energy Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Ngk Insulators, Inc.

Panasonic Holdings Corporation

Sumitomo Metal Mining Company, Ltd.

Kaoru Nagata

Takeshi Ogasawara

Masahiro Kinoshita

Masanori Maekawa

Tsutomu Nanataki

Masaya Ugaji

Ryuta Sugiura

Nobuyuki Kobayashi

Hidekazu Hiratsuka

Tatsuhiko Suzuki

Tsutomu Nishioka

Manabu Takijiri

Takaya Tochio

Miki Mizawa

Hideharu Takezawa

Taizou Sunano

Takayuki Ishikawa

Tetsuo Nanno

Akihiro Kawakita

Takashi Otsuka

Hiroyuki Fujimoto

Sho Urata

Rie Matsuoka

Shoichi Imashiku

Takaaki Oka

Noriko Manabe

Ayumi Miura

This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35 r of the center.

Positive electrode active material for non-aqueous electrolyte secondary battery and method for producing same

A positive-electrode active material for a lithium-ion secondary battery, wherein an average pore size of the positive-electrode active material is 0.2 μm to 1.0 μm when a pore size is measured in a range of 0.0036 μm to 400 μm.

Positive-electrode active material for lithium-ion secondary battery and lithium-ion secondary battery

In a non-aqueous electrolyte secondary battery that is one example of the embodiment, a positive electrode mix layer comprises a positive electrode active material comprising a lithium transition metal composite oxide represented by general formula: LiNiCoAlO(0.9<a≤1.2, 0.88≤b≤0.96, 0.04≤c≤0.12, 1.9≤d≤2.1) and lithium carbonate in an amount of 0.1 to 1.0% by mass relative to the mass of the positive electrode active material. The lithium transition metal composite oxide has the form of secondary particles formed by the aggregation of primary particles, wherein tungsten is present, on the surface of each of the primary particles, in an amount of 0.05 to 0.20 mol % relative to the total molar amount of non-Li-metal elements contained in the positive electrode active material.

Non-aqueous electrolyte secondary battery

This positive electrode active material for non-aqueous electrolyte secondary batteries comprises: lithium transition metal oxide particles; a metal compound which contains a metal element M and adheres to the surfaces of the lithium transition metal oxide particles; and a lithium metal compound which contains lithium (Li) and the metal element M and adheres to the surfaces of the lithium transition metal oxide particles. In this connection, the metal element M is composed of at least one substance that is selected from among aluminum (Al), titanium (Ti), manganese (Mn), gallium (Ga), molybdenum (Mo), tin (Sn), tungsten (W) and bismuth (Bi).

Positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

An object of the present disclosure is to provide a nonaqueous electrolyte secondary battery that can suppress lowering in capacity due to high-temperature storage of the battery. The nonaqueous electrolyte secondary battery () includes: a positive electrode () containing one or more positive electrode active materials; a negative electrode (); and a nonaqueous electrolyte containing a fluorine compound, where: the positive electrode active materials include a complex oxide A containing Li, Ni, and W and a complex oxide B containing Li, Ni, and W as an optional element; W content in the complex oxide A is 5 mol % or more; W content in the complex oxide B is 0.5 mol % or less; and a mass ratio of the complex oxide A is 0.002% or more and 0.1% or less relative to the total of the complex oxide A and the complex oxide B.

Nonaqueous electrolyte secondary battery

This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35r of the center.

A positive electrode for a non-aqueous electrolyte secondary battery contains a first particle and a second particle. The first particle contains an electrochemically active positive-electrode active material, and the positive-electrode active material contains a lithium transition metal oxide. The second particle contains an electrochemically inactive metal oxide. An electrochemically inactive phosphate adheres to the surface of the second particle.

Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery according to one mode of the present disclosure is provided with: a positive electrode including a positive-electrode active material layer; a negative electrode; and a non-aqueous electrolyte, wherein the positive-electrode active material layer includes positive-electrode active material particles having a particle size distribution in which the difference (D90-D10) between a 90% diameter (D90) and a 10% diameter (D10) measured with a laser diffraction method is larger than 13 &#x3bc;m. In addition, the positive-electrode active material layer is characterized in that, on an arbitrarily defined cross section thereof, the total area of positive-electrode active material particles A, each of which has a particle size not smaller than 15 &#x3bc;m and has a particle area at least 0.8-fold the area of a circle circumscribing the positive-electrode active material particle, is 20% or larger with respect to the total area of the cross section.

A positive electrode active material for nonaqueous electrolyte secondary batteries, which has high energy density and excellent cycle characteristics. A positive electrode active material for nonaqueous electrolyte secondary batteries of the present invention is represented by general formula LiNiCoMO(wherein M represents at least one element selected from among metal elements, 0.3&#x2264;x&#x3c;1.0 and 0&#x3c;y&#x2264;0.5) and is configured of particles, each of which is an aggregate of crystallites. Each particle has a compressive breaking strength of from 200 MPa to 500 MPa (inclusive), and the crystallite diameter in the vector direction of the particle is from 100 nm to 300 nm (inclusive).

Positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery has both high capacity and high regeneration. A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains a Ni-containing lithium transition metal oxide having a layered structure and also contains a tungsten compound and/or a molybdenum compound. The percentage of Ni is greater than 90 mole percent with respect to the molar amount of the lithium transition metal oxide. The amount of the compound is 0.1 mole percent to 1.5 mole percent with respect to the molar amount of the lithium transition metal oxide in terms of tungsten element and/or molybdenum element.

The invention provides nonaqueous electrolyte secondary batteries having excellent output characteristics during large-current charging and discharging. A nonaqueous electrolyte secondary battery according to one aspect of the invention includes a positive electrode including a lithium transition metal oxide, a negative electrode including a negative electrode active material capable of storing and releasing lithium ions, and a nonaqueous electrolyte, the negative electrode active material including a carbon material as a main component, the negative electrode including a tungsten compound and/or a molybdenum compound. The tungsten compound and/or the molybdenum compound is preferably attached to the surface of the carbon material.

Nonaqueous electrolyte secondary batteries

To provide a lithium secondary battery which has high capacity while maintaining excellent cycle characteristic. The lithium secondary battery cathode of the present invention includes a cathode collector formed of a conductive substance, and a cathode active material layer formed of a sintered lithium composite oxide sheet. The cathode active material layer is bonded to the cathode collector by the mediation of a conductive bonding layer. A characteristic feature of the present invention resides in that the cathode active material layer has a thickness of 30 &#x3bc;m or more, a mean pore size of 0.1 to 5 &#x3bc;m, and a voidage of 3% or more and less than 15%.

Lithium secondary battery and cathode of the lithium secondary battery with conductive bonding layer

To provide a lithium secondary battery which has high capacity while maintaining excellent cycle characteristic. The lithium secondary battery cathode of the present invention includes a cathode collector formed of a conductive substance, and a cathode active material layer formed of a sintered lithium composite oxide sheet. The cathode active material layer is bonded to the cathode collector by the mediation of a conductive bonding layer. A characteristic feature of the present invention resides in that the cathode active material layer has a thickness of 30 &#x3bc;m or more, a voidage of 3 to 30%, and an open pore ratio of 70% or higher.

Lithium secondary battery and cathode of the lithium secondary battery

An electrode for an electrochemical element reversibly absorbing and releasing lithium ions including: a current collector having a higher first convex portion and a lower second convex portion on at least one surface thereof; a columnar body including an active material formed in such a manner as to rise obliquely on the first convex portion and the second convex portion of the current collector.

Growing community of inventors

Osaka, Japan

Kaoru Nagata