Bell Communications Research, Inc.

Saint-Gobain Materiaux De Construction S.a.s.

Philippe Barboux

Jean-Marie Tarascon

Frough K Shokoohi

Lethicia Gueneau

Christelle Pousse

Sophie Vanpoulle

Frough Keyvan Shokoohi

Methods are described for the low temperature preparation of the spinel LiMn.sub.2 O.sub.4 and layered LiCoO.sub.2 phases which are intercalable compounds of interest for use in lithium secondary batteries. These phases can be prepared in bulk or thick film form at temperatures less than 400.degree. C. using acetate precursors.

Method for preparation of LiCoO.sub.2 intercalation compound for use in

Method is described for the low temperature preparation of the spinel LiMn.sub.2 O.sub.4 phase which is an intercalable compound of interest for use in lithium secondary batteries. This phase can be prepared in bulk or thick film form at temperatures less than 400.degree. C. using acetate precursors.

Method for preparation of LiMn.sub.2 O.sub.4 intercalation compounds and

Techniques for the preparation of superconducting perovskites in the MBa.sub.2 Cu.sub.3 O.sub.7-y system wherein M represents yttrium of a rare earth element and y is an integer ranging from 0.1 to 0.8 are described. The techniques involve the use of either a sol-gel or controlled precipitation process in which a barium solution in acetic acid is reacted with copper acetate and either a rare earth hydroxide or rare earth nitrate to form a colloid which is subsequently heated and fired to yield the desired composition. In the embodiment in which the nitrate is employed, the resultant colloid is freeze dried. In both the sol-gel and controlled precipitation processes, heating and firing are required to yield the desired characteristics.

Method of making high tc oxide superconductor particles by adjusting pH

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Paris, France

Philippe Barboux