Ngk Insulators, Inc.

Akira Urakawa

Tsutomu Nanataki

Shigeki Okada

Ryuta Sugiura

Nobuyuki Kobayashi

Jun Yoshikawa

Shohei Yokoyama

Shuichi Ozawa

Kazuki Maeda

An object of the present invention is to provide a lithium secondary battery cathode which can more improve characteristics of the battery. The cathode of the present invention includes an electroconductive cathode current collector, a plurality of plate-like particle formed of a cathode active material, and a binder containing microparticles formed of the cathode active material and being smaller than the plate-like particles. The plate-like particles are formed so as to have an aspect ratio of 4 to 50. The plate-like particles are arranged such that the particles cover the surface of the cathode current collector surface at a percent area of 85 to 98%. The binder is disposed so as to intervene between two adjacent plate-like particles.

Lithium secondary battery cathode

A cathode active material precursor particle, a method for producing thereof and a method for producing cathode active material for a lithium secondary battery. The cathode active material precursor particle is capable of forming a cathode active material for a lithium secondary battery including a lithium composite oxide having a layered rock salt structure through lithium incorporation. The particles are characterized by the cathode active material precursor particle being formed into a substantially spherical shape and includes therein a large number of voids in a substantially uniform manner; and the cathode active material precursor particle has: an average particle diameter D50 of 0.5 to 5 &#x3bc;m; a specific surface area of 3 to 25 m/g; and a relative tap density, which is a value obtained by dividing a tap density by a theoretical density of a material constituting the cathode active material precursor particle, of 0.25 to 0.4.

Cathode active material precursor particle, method for producing thereof and method for producing cathode active material for lithium secondary battery

The present invention relates to a cathode and a cathode active material plate for a lithium secondary battery, and the production method thereof. There is a feature of the present invention in that grooves consisting of a concave portion and having an infinite form (for example, an infinite cell-like shape) in a planar view are formed in a principal surface of the cathode active material plate.

Cathode and a cathode active material plate for a lithium secondary battery and method for manufacturing these

The present invention provides a cathode active material for a lithium secondary battery containing therein an open pore having a protrusion which is formed so as to extend from the inner surface of the open pore toward the center of the open pore. Specifically, the protrusion is formed so as to extend toward the center of a virtual circle formed by approximating the shape of a cross section of the open pore to a circular shape. The protrusion is formed of the same material as the remaining portion of the cathode active material.

Cathode active material for lithium secondary battery

An object of the present invention is to provide a lithium secondary battery cathode which can more improve characteristics of the battery. The cathode of the present invention includes a first layer composed of a plate-like cathode active material and a second layer containing particles of the cathode active material and a binder, the second layer being joined to the first layer in a stacked state.

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Nagoya, Japan

Akira Urakawa