Tanaka Chemical Corporation

Sharp Kabushiki Kaisha Corporation

Toyoshi Iida

Takehito Mitate

Naoto Torata

Tetsushi Makino

Shigeyuki Hamano

Kazuaki Minato

Hiroyuki Ito

Takeshi Usui

Mamoru Shimakawa

Tomohiko Inada

Naoyoshi Kameda

Tetsuya Yoneda

The present invention provides high density cobalt-manganese coprecipitated nickel hydroxide, particularly having a tapping density of 1.5 g/cc or greater, and a process for its production characterized by continuous supply of an aqueous solution of a nickel salt which contains a cobalt salt and a manganese salt, of a complexing agent and of an alkali metal hydroxide, into a reactor either in an inert gas atmosphere or in the presence of a reducing agent, continuous crystal growth and continuous removal.

High density cobalt-manganese coprecipitated nickel hydroxide and process for its production

A process for producing a positive electrode active material for a nonaqueous secondary battery comprising the steps of: dissolving, in an alcohol as a medium, a starting material which contains metals necessary for giving a compound represented by the formula LiNi M O , wherein 0&lE;X<0.5 and M is at least one metal selected from transition metals and 3B-, 4B- and 5B-group elements, as a positive electrode active material, and which is soluble in the alcohol; adding a sufficient amount of oxalic acid to the resulting solution to produce a precipitate slightly soluble in the alcohol: separating the slightly soluble precipitate from the solution: and calcining the precipitate to obtain the positive electrode active material.

Process for producing a positive electrode active material for a nonaqueous secondary battery and a nonaqueous secondary battery using the active material

A process of preparing lithium nickel oxide as a positive electrode active material comprising: dissolving a water-soluble lithium compound and a water-soluble nickel compound in water to prepare a homogeneous aqueous solution; co-precipitating, from the aqueous solution, a lithium salt and a nickel salt which are slightly soluble in water; isolating the resulting co-precipitate and calcining the co-precipitate to obtain lithium nickel oxide.

Process of producing lithium nickel oxide and nonaqueous secondary

A process for preparing lithium nickeloxide (LiNiO.sub.2) for use as a positive electrode active material for a nonaqueous secondary battery, which comprises the steps of: (a) using as the raw materials a lithium compound and a nickel compound at least one of which has a melting point not higher than 300.degree. C.; i) in case where both of the lithium compound and the nickel compound have a melting point not higher than 300.degree. C., mixing the above two compounds after their melting, or mixing the above compounds, melting the mixture and mixing the melted mixture; ii) in case where either one of the lithium compound and the nickel compound has a melting point higher than 300.degree. C., mixing said one having a melting point higher than 300.degree. C. with the remaining one before or after its melting; (b)calcining the resulting mixture at a temperature of 700.degree. C. to 950.degree. C. in air or in an atmosphere containing oxygen in a higher concentration than an atmospheric oxygen concentration.

Process for preparing positive electrode active material, and nonaqueous

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Fukui, Japan

Toyoshi Iida