NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having a wound type electrode body, in which the increase in internal resistance of the battery can be suppressed by suppressing the appearance of unevenness in salt concentration of a nonaqueous electrolyte in the electrode body during a high-rate discharge cycle test.SOLUTION: A nonaqueous electrolyte secondary battery 1 comprises: a wound type electrode body 20 in which a negative electrode plate 31 has a negative electrode active material layer 33 including flat graphite particles 35. The negative electrode active material layer 33 has a plurality of oriented parts 33a of which the X-ray diffraction intensity ratio I(110)/I(002) of the graphite particles 35 is 0.04 or more, and at least one of which is oriented part formed in an inside portion 33g; and a plurality of non-oriented parts 33b of which the X-ray diffraction intensity ratio I(110)/I(002) is 0.02 or less and which form portions other than the oriented parts 33a.SELECTED DRAWING: Figure 5