The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 1977
Filed:
Jun. 03, 1976
Harold S Horowitz, Clark, NJ (US);
John M Longo, New Providence, NJ (US);
Exxon Research & Engineering Co., Linden, NJ (US);
Abstract
A new low temperature layered manganese compound of the formula Ca.sub.2 Mn.sub.3 O.sub.8 has unexpectedly been synthesized in pure form. The unit cell dimensions of this new compound have been determined by X-ray diffraction and reveal that the compound is monoclinic with lattice parameters of a=11.02 A, b=5.85 A, c=4.94 A, .alpha.=90.degree., .beta.=109.80.degree., .gamma.=90.degree.. The structure consists of pseudohexagonal Mn.sup.4+ sheets with similar oxygen sheets on either side, giving a distorted octahedral coordination to the Mn.sup.4+. Every fourth Mn.sup.4+ is missing in these layers, so their composition is Mn.sub.3 O.sub.8 with chains of coordination octahedra linked by common edges (rutile type arrangement). The Ca ions are situated between the Mn.sub.3 O.sub.8 layers. This new Ca.sub.2 Mn.sub.3 O.sub.8 compound is prepared in pure form by means of the solid solution precursor technique whereby solid solution, mixed metal carbonates of the desired metals (Ca and Mn) having the calcite structure are precipitated from mixtures of the solutions of the salts of calcium and manganese, said salts being selected from the group consisting of carbonates, nitrates, sulfates, oxalates, acetates, precipitation being the result of the addition of a source of carbonate ions, such as ammonium carbonate, sodium carbonate, potassium carbonate of CO.sub.2, so as to achieve mixing on the atomic scale. The resulting solid solution mixed metal carbonate is subsequently calcined, preferably at a temperature of from between 600.degree.-875.degree.C to the mixed metal oxide in the pure form possessing high surface area (on the order of 20-50 m.sup.2 /g). This new material has uses as a battery cathode.