ELECTRODE, SECONDARY BATTERY, BATTERY PACK, ELECTRIC VEHICLE, ELECTRIC POWER STORAGE SYSTEM, ELECTRIC POWER TOOL, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery capable of obtaining superior battery characteristics.SOLUTION: (A) A positive electrode includes a positive electrode active material, and the positive electrode active material includes a lithium phosphate compound represented by LiM1PO(M1 is Fe and the like, and 0≤a≤2 and b≤1 are satisfied). (B) Fine pore distribution of the positive electrode measured by a mercury intrusion method indicates a peak P1 in a range where a pore diameter is 0.01 μm or more and less than 0.15 μm, and indicates a peak P2 in a range where the pore diameter is 0.15 μm to 0.9 μm. (C) A ratio I2/I1 between the intensity I1 of the peak P1 and the intensity I2 of the peak P2 is from 0.5 to 20. (D) Porosity of the positive electrode is 30 to 50%.