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AssigneeHitachi Metals, Ltd.
InventorsAkira Gunji, Hisato Tokoro, Shin Takahashi, Tatsuya Toyama, Hiroshi Haruna, Daiko Takamatsu, Takashi Nakabayashi, Shuichi Takano
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A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+α, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and α are numbers satisfying −0.1≤a≤0.2, 0.7<b≤0.9, 0≤c<0.3, 0≤d<0.3, 0<e≤0.25, 0≤f<0.3, b+c+d+e+f=1, and −0.2≤α≤0.2.
A positive-electrode material for a lithium ion secondary battery, the positive-electrode material containing a lithium complex compound represented by the following Formula (1) and having an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20:
A positive-electrode material for a lithium ion secondary battery, the positive-electrode material containing a lithium complex compound represented by the following Formula (1) and having a concentrated Ti3+ layer on a surface of a secondary particle formed from a plurality of agglomerated primary particles of the lithium complex compound:
Dependencies are inferred from the claim text.