Positive electrode active material, positive electrode, secondary battery, electronic device, and vehicle

A manufacturing method of a positive electrode active material, comprising the steps of:

• mixing a lithium source and a cobalt source;
• performing a heating of the first mixture to obtain a lithium cobalt oxide;
• mixing the lithium cobalt oxide and a fluorine source;
• and
• performing a heating of the second mixture,
• wherein the heating of the first mixture is performed at a temperature higher than or equal to 800° C. and lower than 1100° C., and for longer than or equal to 2 hours and shorter than or equal to 20 hours, and
• wherein when an approximate straight line with three or more measured values at temperatures of higher than or equal to 113 K and lower than or equal to 300 K is drawn in a graph of the inverse of the temperature and a spin concentration per cobalt ion, the slope of the straight line is more than or equal to 5×10−6 and less than or equal to 4×10−5.

A manufacturing method of a positive electrode active material, comprising the steps of:

• mixing a lithium source and a cobalt source;
• performing a heating of the first mixture to obtain a lithium cobalt oxide;
• mixing the lithium cobalt oxide and a fluorine source;
• and
• performing a heating of the second mixture,
• wherein the heating of the first mixture is performed at a temperature higher than or equal to 800° C. and lower than 1100° C., and for longer than or equal to 2 hours and shorter than or equal to 20 hours, and
• wherein in a range of a g value obtained in an electron spin resonance spectrum of the positive electrode active material of greater than or equal to 2.068 and less than or equal to 2.233, a spin concentration at a temperature of 113 K is higher than a spin concentration at a temperature of 300 K by 1.1×10−5 spins/g or more.

A manufacturing method of a positive electrode active material, comprising the steps of:

• mixing a lithium source and a cobalt source;
• performing a heating of the first mixture to obtain a lithium cobalt oxide;
• mixing the lithium cobalt oxide and a fluorine source;
• and
• performing a heating of the second mixture,
• wherein the heating of the first mixture is performed at a temperature higher than or equal to 800° C. and lower than 1100° C., and for longer than or equal to 2 hours and shorter than or equal to 20 hours, and
• wherein in a range of a g value obtained in an electron spin resonance spectrum of the positive electrode active material of greater than or equal to 2.068 and less than or equal to 2.233, a difference between a spin concentration at a temperature of 300K and a spin concentration at a temperature of 113 K is higher than or equal to 4.0×10−5 spins/g.