Cathode mixture, non-aqueous electrolyte secondary battery, and manufacturing method thereof

Abstract

A cathode mixture, a non-aqueous electrolyte secondary battery, and manufacture method thereof are provided. The cathode mixture for a non-aqueous electrolyte secondary battery includes: a cathode active material having an olivine type crystal structure; and an inorganic oxide which does not contribute to charge and discharge. A particle diameter A of the cathode active material lies within a range from 0.1 mum or more to 0.5 mum or less. There is a relation of A>B between the particle diameter A of the cathode active material and a particle diameter B of the inorganic oxide. The non-aqueous electrolyte secondary battery comprises: a cathode; an anode; and a non-aqueous electrolyte. The manufacturing method of a non-aqueous electrolyte secondary battery, comprises: mixing and dispersing acathode active material having an olivine type crystal structure and an inorganic oxide which does not contribute to charge and discharge; and manufacturing a cathode by said dispersed cathode activematerial and said dispersed inorganic oxide.

Description

Positive electrode mixture, non-aqueous electrolyte secondary battery, and manufacturing method thereof Cross references to related applications The present invention contains the subject matter related to Japanese Patent Application JP2006-356895 filed with the Japan Patent Office on December 29, 2006, the entire content of which is incorporated herein by reference. Technical field The invention relates to a positive electrode mixture, a non-aqueous electrolyte secondary battery, and a manufacturing method thereof. More specifically, the present invention relates to a non-aqueous electrolyte secondary battery using a positive electrode active material having an olivin type crystal structure. Background technique In recent years, many portable electronic devices such as camera-integrated VTR (Video Tape Recorder), portable phones, laptop computers, etc. have been put into practical use, and their miniaturization and weight reduction have been achieved. Regarding batteries th...

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Problems solved by technology

However, according to lithium iron phosphate, as compared with lithium cobalt oxide used in the related art, since the intercalation / deintercalation reaction of lithium is slower and the resistance is larger when the battery is charged and discharged, there is a problem that, In the case of high current charge and discharge, it is difficult to obtain sufficient charge / discharge capacity along with the increase of overvoltage

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