Sumitomo Metal Mining Company, Ltd.

Shinsuke Suganuma

Toshihiro Kato

Tetsutaro Hayashi

Willy Shun Kai Bong

Yoshinori Jin-No

Hirokazu Oota

Yukihito Sasaki

To provide a positive electrode active material capable of further reducing positive electrode resistance and exhibiting better output characteristics. A positive electrode active material includes a coating layer formed of a metal composite oxide of Li and one or more metal elements selected from Al, Ti, Zr, Nb, Mo, and W on at least a part of a surface of lithium transition metal-containing composite oxide particles, and has d50 of 3.0 to 7.0 μm, a BET specific surface area of 2.0 to 5.0 m/g, a tap density of 1.0 to 2.0 g/cm, and an oil absorption amount of 30 to 60 ml/100 g, in which the amount of metal elements other than Li contained in the coating layer is 0.1 to 1.5 atom % with respect to the total number of atoms of Ni, Mn, and Co contained in the composite oxide particles.

Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery

A positive electrode active material includes lithium transition metal-containing composite oxide particles containing an additive element M1 and includes a coating layer formed of a metal composite oxide of Li and a metal element M2 on a part of a surface of the particles. The particles have a d50 of 3.0 to 7.0 μm, a BET specific surface area of 2.0 to 5.0 m/g, a tap density of 1.0 to 2.0 g/cm, and an oil absorption amount of 30 to 60 ml/100 g. For each of a plurality of primary particles having a primary particle size within a range of 0.1 to 1.0 μm among the primary particles, a coefficient of variation of the concentration of M1 is 1.5 or less, and the amount of M2 is 0.1 to 1.5 atom % with respect to the total number of atoms of Ni, Mn, and Co contained in the composite oxide particles.

The countercurrent direct-heating-type heat exchanger that is able to suppress drift in the case when a fluid to be heated is supplied. The heat exchanger is equipped with a feed pipe, a feed nozzle, ring-like straightening plates and umbrella-type dispersing plates of the above fluid to be heated, characterized in that the above feed nozzle has the shape of a pipe having a circular cross section and the dimension satisfying the following formula (1) and formula (2):&#x2267;1&#x2003;&#x2003;Formula (1)wherein, Ln indicates the length of the feed nozzle; and Dn indicates the inside diameter of the feed nozzle; and1.5&#x2266;&#x2266;2.0&#x2003;&#x2003;Formula (2)wherein, Sp indicates the inner cross-sectional area of the feed pipe; and Sn indicates the inner cross-sectional area of the feed nozzle.

Growing community of inventors

Niihama, Japan

Shinsuke Suganuma