Sumitomo Osaka Cement Co., Ltd.

Koji Oono

Takao Kitagawa

Masataka Oyama

Tetsuya Nakabeppu

Kenta Ooishi

Kazuyo Yamamoto

Tatsuya Nakabeppu

A cathode material is provided which comprises secondary particles of cathode active material particles including central particles of LiFeMPOand a carbonaceous film which coats the central particles, wherein a particle size distribution thereof has maximum values of a relative particle amount on both fine and coarse particle sides. A particle diameter with the maximum relative particle amount on the fine particle side is in a range A of 0.70 &#x3bc;m to 2.00 &#x3bc;m, and a particle diameter with the maximum relative particle amount on the coarse particle side is in a range B of 7.00 &#x3bc;m to 15.00 &#x3bc;m. A difference between maximum values of a relative particle amount is 2.00% to 6.00%.

Cathode material for lithium-ion secondary battery, cathode for lithium-ion secondary battery, and lithium-ion secondary battery

An electrode material which can improve the mobility of electrons and the mobility of ions at the same time, and, furthermore, does not have a problem of the impairment of the diffusion of lithium ions in a thin layer containing a carbonaceous electron-conductive substance so as to be excellent in terms of load characteristics and energy density, and an electrode and a lithium ion battery are provided. The electrode material of the invention is produced by forming a thin layer made of a carbonaceous electron-conductive substance on surfaces of primary particles made of an electrode active material, in which the carbonaceous electron-conductive substance contains nitrogen atoms.

Electrode material, electrode and lithium ion battery

An electrode material contains an agglomerate formed by agglomerating a plurality of agglomerated particles formed by agglomerating a plurality of particles of a carbonaceous coated electrode active material having a carbonaceous coat formed on a surface, the agglomerate is made up of hollow-structured particles and solid-structured particles, the average particle diameter of the agglomerate is in a range of 0.5 &#x3bc;m to 100 &#x3bc;m, the volume density of the agglomerate is in a range of 50% by volume to 80% by volume, the micropore distribution of micropores present in the agglomerate is monomodal, the average micropore diameter in the micropore distribution is 0.3 &#x3bc;m or less, and the NMP oil absorption amount of the agglomerate is in a range of 40 g/100 g to 100 g/100 g.

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Tokyo, Japan

Koji Oono