Sanyo Electric Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Manabu Takijiri

Takeshi Ogasawara

Masanobu Takeuchi

Kaoru Nagata

Katsunori Yanagida

Yoshinori Kida

Takayuki Shirane

Junichi Sugaya

Hiroyuki Fujimoto

Tomoki Tsuji

Sho Urata

Yuta Kuroda

Rie Matsuoka

Masahiro Shiraga

Takaaki Oka

In this non-aqueous electrolyte secondary battery, a positive electrode includes a lithium transition metal composite oxide that contains Ni at 85 mol % or more with respect to the total number of moles of metal elements excluding Li, and a negative electrode includes graphite particles having an internal porosity of 1-5%. The N/P ratio is 1.00-1.05, where P is the charging capacity of the positive electrode, and N is the charging capacity of the negative electrode.

Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material containing a composite oxide particle that includes Ni, Co and Li, and also includes at least one among Mn and Al, and the ratio of Ni to the total number of moles of metal elements excluding Li is 50 mol % or more. In the composite oxide particle, the ratio (A/B) of a BET specific surface area (A) to a theoretical specific surface area (B) determined by the following formula is more than 1.0 and less than 3.3. Theoretical specific surface area (B) (m/g)=6/(true density (g/cm)×volume average particle diameter (μm)).

A nonaqueous electrolyte secondary battery includes a positive electrode including a positive electrode mix layer, a negative electrode including a negative electrode mix layer, and a nonaqueous electrolyte containing a nonaqueous solvent. A surface of the negative electrode mix layer is provided with grooves. The nonaqueous electrolyte contains 10 volume percent or more of a fluorinated solvent with respect to the volume of the nonaqueous solvent and has a viscosity (25&#xb0; C.) of 3.50 mPa&#xb7;s or more as measured with a differential pressure viscometer.

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

An object is to provide a positive electrode for a non-aqueous electrolyte secondary battery and a non-aqueous electrolyte secondary battery that allow a high output characteristic. Included are a positive electrode collector and a positive electrode mixture layer formed on at least one surface of the positive electrode collector. The positive electrode mixture layer contains particlesof lithium nickel cobalt manganese oxide represented by LiNiCoOMnO, erbium oxyhydroxidefixed on the surfaces of the particles of the lithium nickel cobalt manganese oxide, tungsten trioxideadhering to the surfaces of the particles of the lithium nickel cobalt manganese oxide, and a binder.

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

Provided is a nonaqueous electrolyte secondary battery with improved high-rate discharge characteristics. The nonaqueous electrolyte secondary battery includes a positive electrode including a metal foil and a positive electrode active material layer formed thereon; a negative electrode containing a negative electrode active material; and a nonaqueous electrolyte containing a nonaqueous solvent and a solute dissolved therein. The metal foil of the positive electrode is an aluminum foil having an at least partially roughened surface adjacent to the positive electrode active material layer. The positive electrode includes a conductive layer containing a conductor and a binder in recesses in the at least partially roughened surface of the aluminum foil. The positive electrode active material layer is disposed on the conductive layer and contains a positive electrode active material, the conductor, and the binder.

Nonaqueous electrolyte secondary battery having a positive electrode including an aluminum foil and a positive electrode active material layer formed thereon

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Osaka, Japan

Manabu Takijiri