Cathode active material, cathode, and nonaqueous electrolyte secondary battery

Abstract

The present application provides a nonaqueous electrolyte secondary battery which includes a cathode having a cathode active material layer, an anode, and a nonaqueous electrolyte, wherein the cathode active material layer includes secondary particles of a lithium phosphate compound having olivine structure, an average particle diameter A of primary particles constituting the secondary particles is 50 nm or more and 500 nm or less, and a ratio B / A of a pore diameter B of the secondary particles to the average particle diameter A of the primary particles is 0.10 or more and 0.90 or less, preferred 0.10 or more and 0.75 or less.

Description

[0001] Cross References to Related Applications

[0002] The present application contains subject matter related to Japanese Patent Application JP 2007-311700 filed in the Japan Patent Office on Nov. 30, 2007, the entire content of which is hereby incorporated by reference. technical field

[0003] The present invention relates to a positive electrode active material and a nonaqueous electrolyte secondary battery, and more particularly, to a positive electrode active material, a positive electrode, and a nonaqueous electrolyte secondary battery which are excellent in high capacity and high power characteristics. Background technique

[0004] Recently, many portable electronic devices, such as camera-integrated video tape recorders (VTRs), mobile phones, or laptop computers, have appeared, and reductions in their size and weight have been considered. Research and development of batteries, especially secondary batteries to be used as portable power sources of such electronic d...

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