PROBLEM TO BE SOLVED: To provide an external heat type rotary kiln for preventing contamination of chromium or the like at the time of heat treatment of powder electrode material and restricting a reduction in battery characteristics.;SOLUTION: Since a cylindrical outer pipe 52 has an inner peripheral layer 52b composed of pure nickel (Ni) having a reactivity resistance against lithium, nickel, cobalt, manganese and the like at its inside part, for example, even if a lithium component and a part of nickel component of a powder-like electrode material enters into a clearance between the outer pipe 52 and an inner pipe 54 to contact a layer-like inner peripheral layer 52b formed inside the outer pipe 52, it does not react with pure nickel constituting the inner peripheral layer 52b and does not produce hexavalent chromium and the like. Due to this fact, hexavalent chromium and the like are not mixed at the time of heat treatment of the powder-like electrode material and a reduction of battery characteristics of a lithium battery in which the powder-like anode material is applied as an anode substance is restricted.;COPYRIGHT: (C)2014,JPO&INPIT
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