POSITIVE ELECTRODE MATERIAL FOR SODIUM SECONDARY BATTERY, MANUFACTURING METHOD THEREOF, SODIUM SECONDARY BATTERY ELECTRODE USING THE POSITIVE ELECTRODE MATERIAL FOR SODIUM SECONDARY BATTERY, NONAQUEOUS SODIUM SECONDARY BATTERY HAVING THE SODIUM SECONDARY BATTERY ELECTRODE, AND ELECTRIC DEVICE HAVING THE NONAQUEOUS SODIUM SECONDARY BATTERY INCORPORATED THEREIN

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode material for a sodium secondary battery, a manufacturing method thereof, a sodium secondary battery electrode using the positive electrode material for a sodium secondary battery, a nonaqueous sodium secondary battery having the sodium secondary battery electrode and an electric device having a nonaqueous sodium secondary battery incorporated therein which allow the achievement of an excellent charge/discharge capacity and an excellent capacity-keeping rate.SOLUTION: The positive electrode material for a sodium secondary battery comprises: a transition metal oxide solid solution having a crystal structure of a space group R-3 m (No.166). The positive electrode material has lattice constants which satisfy the conditions of 2.80≤a≤3.00 Å and 16.0≤c≤16.6 Å, and diffraction peaks of (003)plane and (104)plane which meet the condition of 1.1≤I(104)/I(003)≤1.3.