초록 ▼

The present invention includes a method of preparing secondary lithium and lithium-ion batteries with improved coulombic efficiency, improved cycling and storage performance at elevated temperatures, and lower rates of transition metal dissolution. In accordance with the present invention, the posit

The present invention includes a method of preparing secondary lithium and lithium-ion batteries with improved coulombic efficiency, improved cycling and storage performance at elevated temperatures, and lower rates of transition metal dissolution. In accordance with the present invention, the positive electrode material is thermally treated at a temperature of between 50.degree. C. and 120.degree. C. to produce a passivating film having lithium ion conductivity. The present invention also includes a secondary lithium or lithium-ion cell having positive electrode material covered with a thermally-activated thin passivating film having lithium ion conductivity and a positive electrode material formed of particles of a lithium intercalation compound with a passivating film on the surface of the particles.

대표청구항 ▼

[ That which is claimed:] [1.]1. A method of pretreating a freshly prepared, positive electrode for a secondary lithium or lithium-ion cell comprising thermally treating a positive electrode in its discharge state and in a liquid nonaqueous electrolyte at a temperature of between 50.degree. C. and 1

[ That which is claimed:] [1.]1. A method of pretreating a freshly prepared, positive electrode for a secondary lithium or lithium-ion cell comprising thermally treating a positive electrode in its discharge state and in a liquid nonaqueous electrolyte at a temperature of between 50.degree. C. and 120.degree. C. to thereby create a thin, passivating film with lithium ion conductivity on the positive electrode.