POSITIVE ELECTRODE FOR LITHIUM-ION SECONDARY BATTERY AND PRODUCTION PROCESS FOR THE SAME, AND LITHIUM-ION SECONDARY BATTERY

摘要

A positive-electrode active-material layer is formed of positive-electrode active-material particles including an Li compound or solid solution selected from the group consisting of LixNiaCobMncO2, LixCobMncO2, LixNiaMncO2, LixNiaCobO2 and Li2MnO3 (note that 0.5≦“x”≦1.5, 0.1≦“a”<1, 0.1≦“b”<1 and 0.1≦“c”<1); a binding portion not only binding the positive-electrode active-material particles together one another but also binding the positive-electrode active-material particles together with the current collector; and an organic/inorganic coating layer covering at least parts of surface of the positive-electrode active-material particles. Since the organic/inorganic coating layer has high joining strength to the Li compound, the positive-electrode active-material particles and an electrolytic solution are inhibitable from contacting directly with one another at the time of a high-voltage driving mode or operation.

主权项

1. A positive electrode for lithium-ion secondary battery comprising:
a current collector; and a positive-electrode active-material layer bound together onto the current collector; the positive-electrode active-material layer comprising: positive-electrode active-material particles including an Li compound or solid solution selected from the group consisting of LixNiaCobMndO2, LixCobMncO2, LixNiaMncO2, LixNiaCobO2 and Li2MnO3 (note that 0.5≦“x”≦1.5, 0.1≦“a”<1, 0.1≦“b”<1 and 0.1≦“c”<1); a binding portion not only binding the positive-electrode active-material particles together one another but also binding the positive-electrode active-material particles together with the current collector; and an organic/inorganic coating layer covering at least parts of surface of the positive-electrode active-material particles at least; the organic/inorganic coating layer including: at least one optional polymer selected from polymers with at least one member selected from the group consisting of amino groups, imino groups, imide groups and maleimide groups; and at least one optional metal selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements.