Tosoh Corporation

Setsuo Yoshida

Kenichi Takahashi

Kazumasa Suetsugu

Eiichi Iwata

Takahiro Masuda

Ken-ichi Takahashi

Yukinori Sudo

Masaki Okada

Masanori Sawano

To provide a palladium separating agent capable of separating palladium ions from a solution containing palladium ions of a low concentration to a high concentration in a short time with a high selectivity, and a method for separating palladium. A palladium separating agent having a functional group represented by the formula (1) bonded to a carrier:&#x2014;Z&#x2014;(CH)-S&#x2014;R&#x2003;&#x2003;(1)

Palladium separating agent, method for producing same and use of same

Electrolytic manganese dioxide characterized by having a surface sulfate (SO) content of smaller than 0.10% by weight and a JIS-pH value, as measured according to JIS K1467, of at least 1.5 but smaller than 3.5, preferably at least 2.1 but smaller than 3.2 is provided. Preferably 3% to 25% in number of the fine particles of the manganese dioxide have a particle diameter of not larger than 1 &#x3bc;m. A battery provided with a cathode made from the electrolytic manganese dioxide as active material exhibits good high-rate discharge characteristics and good resistance to metal corrosion.

Electrolytic manganese dioxide, positive electrode active material, and battery

A novel lithium-manganese oxide composition suitable for use in lithium secondary batteries as an active material for positive electrodes, said oxide having a spinel type crystal structure, an Li:Mn molar ratio of 0.9-1.10:2.00, a mean Mn oxidation number of 3.40-3.60 valencies, and a BET specific surface area of at least 1 m.sup.2 /g, substantially all the primary particles of said oxide being less than 1 .mu.m; a process for preparing such an oxide and a lithium secondary battery containing such an oxide are also disclosed.

Spinel type lithium-mangenese oxide material, process for preparing the

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Shunan, Japan

Setsuo Yoshida