NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND BATTERY PACK

摘要

According to an embodiment, a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode containing a lithium titanium composite oxide having a spinel structure as a negative electrode active material, and a nonaqueous electrolyte, wherein the lithium titanium composite oxide that is the negative electrode active material has an average particle size based on a mass basis of 0.3 µm or more but 0.9 µm or less, and a lithium carbonate content rate of the negative electrode is 0.1% by mass or less per mass of the negative electrode active material, is provided.