Sony Corporation

Yukifumi Takeda

Hideki Nakai

Tomoyo Ooyama

Masanori Soma

Tomoyuki Nakamura

Takahiro Endo

Gentaro Kano

Takeru Yamamoto

Takehiko Suwa

Yuji Uchida

A cathode active material has: a lithium composite oxide which contains the highest proportion of nickel among constituent metal elements except lithium; and a phosphorus compound which is contained near the surface of the lithium composite oxide, and a cathode including the cathode active material.

Cathode active material, cathode, and nonaqueous electrolyte battery

A cathode active material has: a lithium composite oxide which contains the highest proportion of nickel among constituent metal elements except lithium; and a phosphorus compound which is contained near the surface of the lithium composite oxide, a cathode including the cathode active material, and a method for manufacturing the cathode.

Cathode active material, cathode, nonaqueous electrolyte battery, and method for manufacturing cathode

A battery capable of obtaining a high capacity and reducing its expansion is provided. A spirally wound electrode body formed through laminating a cathode and an anode with a separator and an electrolyte in between to form a laminate and spirally winding the laminate is included in a package member made of an aluminum laminate film. An anode active material layer includes an agglomerated graphite material in which a plurality of primary particles made of graphite having fine pores are agglomerated so that the orientation planes thereof are not parallel to each other, at least in part, to form secondary particles. In the agglomerated graphite material, the total volume of fine pores with a diameter from 10 nm to 1&#xd7;10nm inclusive estimated by mercury porosimetry ranges from 0.5 cm/g to 1.5 cm/g inclusive per unit weight.

Anode active material and battery

A non-aqueous solvent is provided that includes ethylene carbonate in a range from 5% or more to less than 60%, propylene carbonate of 40% or less, and diethyl carbonate of 40% or more, as mass ratios. The non-aqueous electrolyte compositions are formed by further adding an electrolytic salt and, if necessary, unsaturated cyclic carbonic ester and a high molecular compound into the non-aqueous solvent. A non-aqueous electrolyte secondary battery is formed by using the non-aqueous electrolyte compositions.

Growing community of inventors

Fukushima, Japan

Yukifumi Takeda