NEGATIVE ELECTRODE AND SECONDARY BATTERY

摘要

A negative electrode including a negative electrode collector and a negative electrode active material layer on the collector. The layer contains a negative electrode active material capable of occluding and releasing lithium. The material in a fully charged state satisfies a conditional expression (1) in 7Li-MAS-NMR analysis:;0≦(B/A)<0.1  (1),where A represents a sum of integrated area of a first peak and integrated area of a side band peak of the first peak, the first peak indicating a chemical shift in a range of −1 ppm or more and 25 ppm or less with respect to a reference position where a resonant peak of a LiCl aqueous solution having a concentration of 1 mol/dm3 appears. B represents integrated area of a second peak indicating a chemical shift in a range of 25 ppm or more and 270 ppm or less with respect to the reference position.

主权项

1. A secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte, wherein,
the negative electrode includes a negative electrode current collector and a negative electrode active material layer on the negative electrode current collector, the negative electrode active material layer including a negative electrode active material particle including silicon; andthe negative electrode active material layer in a fully charged state satisfies a conditional expression (1) below in 7Li-MAS-NMR analysis
0≦(B/A)<0.1  (1),where A represents a sum of integrated area of a first peak and integrated area of a side band peak of the first peak, the first peak indicating a chemical shift in a range of −1 ppm or more and 25 ppm or less with respect to a reference position where a resonant peak of a LiCl aqueous solution having a concentration of 1 mol/dm3 appears, and B represents integrated area of a second peak indicating a chemical shift in a range of 250 ppm or more and 270 ppm or less with respect to the reference position where the resonant peak of a LiCl aqueous solution having a concentration of 1 mol/dm3 appears, the second peak being different from the side band peak of the first peak.