LITHIUMSEKUNDÄRZELLE MIT ORGANISCHEM ELEKTROLYTEN, AKTIVES MATERIAL FÜR POSITIVE ELEKTRODE EINER LI-SEKUNDÄRZELLE UND VERFAHREN ZUR HERSTELLUNG DES AKTIVEN MATERIALS

摘要

The lithium secondary cell uses lithium or a compound containing lithium as the negative electrode, and lithium nickel oxide as the active material for the positive electrode. This cell is produced to enhance the charge and discharge capacity. The lithium nickel oxide is prepared as follows. Nickel oxide which contains nickel of more than trivalence or a nickel salt which produces nickel of more than trivalence when heated, and lithium salt are mixed at an Li/Ni (mole ratio) of 1.0 to 1.5. After preheating the mixture, it is baked at a temperature of 680 DEG to 780 DEG in an oxygen atmosphere, thus producing a lithium nickel oxide. The primary differential absorption spectrum of the electron spin resonance of the lithium nickel oxide is a singlet when measured by use of an X band at a temperature of 77K, and the line distance ( DELTA Hpp) between the peaks is 140 mT or more. The intensity ratios of the main peaks of the components other than the lithium nickel oxide and that of the lithium nickel oxide in a powder X-ray diffraction image are lower than 0.03. The Li/Ni ratio (mole ratio) is above 0.9, and the grain size of the primary particles is below 1 mu m.