Kabushiki Kaisha Toyota Jidoshokki

Dai Matsushiro

Masanori Harata

Tsukasa Sugie

Takefumi Fukumoto

An active material expressed by a general formula; LiNiCoMnDO(where 0.2&#x2264;'a'&#x2264;1, 'b'+&#x201c;c&#x201d;+&#x201c;d&#x201d;+&#x201c;e&#x201d;=1, 0&#x2264;&#x201c;e&#x201d;&#x3c;1, &#x201c;D&#x201d; is at least one element selected from the group consisting of Li, Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K and Al, and 1.7&#x2264;&#x201c;f&#x201d;&#x2264;2.1) includes a high manganese portion, which is made of a metallic oxide including Ni, Co and Mn at least and of which the composition ratio between Ni, Co and Mn is expressed by Ni:Co:Mn=b2:c2:d2 (note that &#x201c;b2&#x201d;+&#x201c;c2&#x201d;+&#x201c;d2&#x201d;=1, 0&#x3c;&#x201c;b2&#x201d;&#x3c;1, 0&#x3c;&#x201c;c2&#x201d;&#x3c;&#x201c;c&#x201d;, and &#x201c;d&#x201d;&#x3c;&#x201c;d2&#x201d;&#x3c;1), in a superficial layer thereof.

Active material excelling in high-voltage characteristics

A lithium composite metallic oxide expressed by: LiNiCoMnDO(where 0.2&#x2264;'a'&#x2264;1.5, 'b'+&#x201c;c&#x201d;+&#x201c;d&#x201d;+&#x201c;e&#x201d;=1, 0&#x3c;&#x201c;e&#x201d;&#x3c;1, &#x201c;D&#x201d; is at least one of the following elements: Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K, Al, Ti, P, Ga, Ge, V, Mo, Nb, W, La, Hf and Rf, and 1.7&#x2264;&#x201c;f&#x201d;&#x2264;2.1), and including: a high manganese portion, which is made of a metallic oxide including Ni, Co and Mn at least and of which the composition ratio between Ni, Co and Mn is expressed by Ni:Co:Mn=g:h:i (note that &#x201c;g&#x201d;+&#x201c;h&#x201d;+&#x201c;i&#x201d;=1, 0&#x3c;&#x201c;g&#x201d;&#x3c;1, 0&#x3c;&#x201c;h&#x201d;&#x3c;&#x201c;c&#x201d;, and &#x201c;d&#x201d;&#x3c;&#x201c;i&#x201d;&#x3c;1), in a superficial layer thereof; and a metallic oxidation portion in an outermost superficial layer of the high manganese portion.

Growing community of inventors

Kariya, Japan

Dai Matsushiro