POSITIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

Japanese Patent JP2015082345

A

PROBLEM TO BE SOLVED: To provide: a positive electrode for lithium ion secondary batteries which includes a lithium-excessive nickel-containing oxide as a positive electrode active material, and which enables the increase in the energy density of a secondary battery by using nickel higher, in oxidized state, than that in a conventional lithium nickel-containing oxide to causing the desorption of more Li ions (equivalent to charge and discharge with nickel having three to four valences); and a lithium ion secondary battery arranged by use thereof.SOLUTION: A positive electrode for lithium ion secondary batteries comprises a positive electrode active material consisting of crystalline particles of lithium-excessive nickel-containing oxide expressed by the general formula, LiNiO(where x satisfies the condition: 0.2