Positive electrode material for lithium-ion secondary batteries, positive electrode for lithium-ion secondary batteries using it, and lithium-ion secondary batteries

Japanese Patent JP6341318

B2

Provided are a cathode material for lithium ion secondary battery having excellent rate characteristics and cycle characteristics while a cathode active substance has high density , and a lithium ion secondary battery cathode and a lithium ion secondary battery that use the above cathode material. The cathode material for lithium ion secondary battery (1), represented by Li 1+x M1 1-x-y M2 y O 2 [where -0.1 ‰¤ x ‰¤ 0.3, 0 ‰¤ y ‰¤ 0.1; M1 is Ni, Co, Mn; and M2 is Mg, Al, Ti, Zr, Mo, Nb, Fe, B], is an agglomerate including secondary particles (50, 60) both formed via aggregation of lithium metal composite oxide primary particles (10) having a layered structure. The secondary particles (50, 60) have D10 in the range from 0.5 µm to 10 µm, and simultaneously D90 in the range of more than 10 µm and equal to 50 µm or less, when analyzed in the laser diffraction/scattering particle size distribution measurement. A mean porosity of the secondary particles having a particle size of more than 10 µm and equal to 50 µm or less is higher than that of the secondary particles having a particle size of 0.5 µm to 10 µm.

Kaoru Feng
Shuichi Takano
Takashi Nakabayashi
Military commander

JP2017103723A

June 13, 2018

May 25, 2017

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Hitachi Metals Co., Ltd.

H01M4/525; C01G53/00; H01M4/505

JP2011175739A
JP2009205974A
JP2012129070A

WO2009099158A1
WO2013084923A1

Isono International Patent and Trademark Office

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