Sanyo Electric Co., Ltd.

Panasonic Energy Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Panasonic Holdings Corporation

Junichi Sugaya

Atsushi Mizawa

Masahiro Nakamura

Tomomichi Ueda

Hiroshi Yoshizawa

Takeshi Ogasawara

Katsunori Yanagida

Yoshiyuki Muraoka

Tetsuo Nanno

Masanobu Takeuchi

Kei Kobayashi

Kozo Watanabe

Manabu Takijiri

Takamitsu Tashita

Takuya Shinomiya

Fumikazu Mizukoshi

Natsuhiko Mukai

Yuji Yamagami

Tsukasa Gejo

Shohei Mitsui

A non-aqueous electrolyte secondary cell comprising a negative electrode () having a negative electrode collector () and a negative electrode active material layer () provided on the negative electrode collector (). The negative electrode active material layer () contains graphite particles A and graphite particles B as negative electrode active materials. The graphite particles A have an internal void rate of 5% or less. The graphite particles B have an internal void rate of 8 to 20%. When the negative electrode active material layeris halved in the thickness direction, a regionon the half closer to the outer surface contains more graphite particles A than a regionon the half closer to the negative electrode collector.

Non-aqueous electrolyte secondary cell

The purpose of the present invention is to shorten the manufacturing time in a method for manufacturing a non-aqueous-electrolyte secondary cell. In the method for manufacturing a non-aqueous-electrolyte secondary cell according to one embodiment of the present invention, during initial charging/discharging of a non-aqueous-electrolyte secondary cell comprising a negative electrode that includes a negative-electrode active material, a positive electrode that includes a Li—Ni composite oxide represented by the general formula LiNiMO(where 0<a≤1.2, 0.6≤x<1, and M is at least one element selected from Co, Mn, and Al) as a positive-electrode active material, and a non-aqueous electrolyte, charging is performed so that the positive electrode potential based on lithium is 4.1-4.25 V in an open circuit state after charging.

Method for manufacturing non-aqueous-electrolyte secondary cell, and voltage detection method

The present disclosure aims to suppress, in a winding type electrode body in which a negative electrode lead is bonded to a winding start side end of a negative electrode collector, electrode plate deformation in association with charge/discharge cycles. A nonaqueous electrolyte secondary battery according to one aspect of the present disclosure includes a winding type electrode body (). A negative electrode () includes a negative electrode lead () bonded to a winding start side end of a negative electrode collector and is wound at least one turn from a winding-direction inner end so as not to face a positive electrode () with a separator () interposed therebetween. The negative electrode () includes an insulating tape () adhered to the negative electrode collector so as to straddle a surface of the negative electrode lead () in a winding direction.

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes: a wound electrode assembly () formed by spirally winding, via a separator (), a positive electrode () and a negative electrode () in which a negative electrode mixture layer is formed on a negative electrode core, where: the negative electrode () includes a non-opposing portion () that is wound 1.25 turns or more from an inner edge in a winding direction of the wound electrode assembly () without facing the positive electrode via the separator (); the non-opposing portion () includes a negative electrode mixture layer-formed portion () in which the negative electrode mixture layer is formed on at least either side continuously in an inward winding direction from an outer edge in the winding direction; and the negative electrode mixture layer-formed portion () is wound 0.75 turns or more.

Cylindrical nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery attains both a high capacity and excellent low-temperature characteristics. A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator, a nonaqueous electrolyte and a battery case accommodating the battery constituents, the positive electrode having a positive electrode mixture layer including a lithium transition metal oxide and a conductive auxiliary, the lithium transition metal oxide containing at least Ni. The percentage of Ni in the total moles of metal element(s) except lithium present in the oxide is not less than 88 mol %, the content of the conductive auxiliary being not less than 0.75 parts by mass and not more than 1.25 parts by mass, the ratio of the lithium transition metal oxide being not less than 25 parts by volume in the inside of the battery case.

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

Disclosed is a positive electrode for a non-aqueous electrolyte secondary battery, including a current collector and a mixture layer attached thereto. The mixture layer includes an active material including particles of a first active material, i.e., a lithium-manganese composite oxide, and particles of a second active material, i.e., a lithium-nickel composite oxide. A proportion of the first active material particles in the active material is 51 vol % to 90 vol %. A volume-based particle size distribution of the first active material particles has a first peak on a larger particle side and a second peak on a smaller particle side. A first particle size Dcorresponding to the first peak is 2.5 to 5 times larger than a second particle size Dcorresponding to the second peak. A volume-based particle size distribution of the second active material particles has a third peak corresponding to a third particle size Dsatisfying D&#x3e;D&#x3e;D.

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

A method for producing a positive electrode for non-aqueous electrolyte secondary battery of the present invention includes the steps of: (1) producing a positive electrode precursor by applying a positive electrode slurry including a positive electrode active material comprising a lithium-containing composite oxide including nickel, a binder, and a conductive agent on a positive electrode core material, the positive electrode active material including secondary particles having an average particle diameter of 8 &#x3bc;m or more, and then drying the positive electrode slurry to form a positive electrode material mixture layer; and (2) rolling while heating the positive electrode precursor to produce a positive electrode in which 3.5 g or more of the positive electrode active material is included per 1 cmof the positive electrode material mixture layer, and the positive electrode active material includes secondary particles having an average particle diameter of 5 &#x3bc;m or more.

Positive electrode containing lithium nickel composite oxide for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery using the same, and method for producing the same

Disclosed is a secondary battery with a non-aqueous electrolyte that has excellent cycle characteristics and output characteristics. Also disclosed is a positive electrode active material for a secondary battery with a non-aqueous electrolyte that includes a powder of a volume resistivity of 20 &#x3a9;&#xb7;cm or more and 100 &#x3a9;&#xb7;cm or less when said powder has a bulk density of 3 g/cm. The use of the lithium nickel composite oxide as a positive electrode active material can provide a secondary battery with a non-aqueous electrolyte that has excellent cycle characteristics and output characteristics.

Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

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Osaka, Japan

Junichi Sugaya