LITHIUM SECONDARY BATTERY AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery having a voltage gradient from the initial discharging to the completion in such a manner as to facilitate detection of a residual capacity by a discharging voltage. SOLUTION: A lithium compound such as lithium hydroxide is mixed with lithium oxide, followed by heat treatment, thus preparing a ramsdellite type crystal structure expressed by a general formula: Li2 Ti3 O7 . A material including mainly lithium titanium oxide having the resultant crystal structure is used as a negative electrode, thus constituting a lithium secondary battery capable of exhibiting variable voltage characteristics with progression of charging/ discharging without deteriorating excellent charging/discharging cycle characteristics.