Panasonic Corporation

Takuhiro Nishimura

Yasutaka Kogetsu

Masaya Ugaji

Masaki Hasegawa

Taisuke Yamamoto

Keisuke Ohara

Masanori Sumihara

Tatsuki Hiraoka

Kunihiko Bessho

A negative electrode for a lithium secondary battery of the present invention includes a current collector and a negative electrode active material layer carried on the current collector. The negative electrode active material layer includes a plurality of columnar particles. The current collector has a surface including a depression and a plurality of projected regions defined by the depression. The projected regions carry the columnar particles. Further, the present invention relates to a lithium secondary battery using the foregoing negative electrode. According to the present invention, it is possible to provide a high-capacity negative electrode excellent mainly in cycle characteristics for a lithium secondary battery, and a lithium secondary battery including the same.

Negative electrode for lithium secondary battery, and lithium secondary battery including the same

An object of the invention is to provide a current collector for a non-aqueous secondary battery in which the strength of the current collector is sufficient in forming an electrode plate and an active material can be efficiently disposed on the protrusions of the current collector, and to provide an electrode plate for a non-aqueous secondary battery and a non-aqueous secondary battery using the same. The invention relates to a current collector for a non-aqueous secondary battery, including a metal foil for carrying at least a positive electrode active material or negative electrode active material. Protrusions are formed in a predetermined arrangement pattern on at least one face of the metal foil and at least tops of the protrusions are not compressed. The arrangement pattern includes: a row direction in which the protrusions are aligned linearly at an equal pitch; and a column direction in which row units comprising a group of the protrusions aligned in the row direction are aligned in parallel at a predetermined interval. The respective protrusions of any one of the row units are displaced in the row direction from the protrusions of another row unit that is adjacent in the column direction. The invention also pertains to an electrode plate for a non-aqueous secondary battery and a non-aqueous secondary battery using the same.

Current collector for non-aqueous secondary battery, electrode plate for non-aqueous secondary battery using the same, and non-aqueous secondary battery

A current collector includes a substrate, a plurality of projections formed on a first portion of the substrate, and at least two adjacent minute projections formed on a second portion of the substrate. The substrate is a metal sheet. The first and second portions are formed on the surface of the substrate. The second portion includes 2 to 100 of minute projections. The minute projections have a height of below 35% of the average height of the plurality of projections. By forming an electrode active material layer on the face of the current collector where the plurality of projections are formed to make an electrode, the detachment of the electrode active material layer, and the spread of the detachment are significantly curbed.

Current collector comprising plurality of projections, electrode, and non-aqueous electrolyte secondary battery comprising the same

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Osaka, Japan

Takuhiro Nishimura