NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which a lithium deposition to a negative electrode surface is suppressed.SOLUTION: A nonaqueous electrolyte secondary battery comprises: a positive electrode; a negative electrode having a negative electrode active material mixture layer including a negative electrode active material; and a nonaqueous electrolyte. The negative electrode active material includes a coated graphite particle coated with a coating layer including a first amorphous carbon and a second amorphous carbon in a front surface of the graphite particle. The negative electrode active material mixture layer includes the coated graphite particle, and a third amorphous carbon as a conductive agent. The nonaqueous electrolyte includes a lithium salt with a difluorophosphate and an oxalate complex as anion.SELECTED DRAWING: Figure 1 【課題】負極表面へのリチウム析出が抑制された非水電解質二次電池を提供する。【解決手段】正極と、負極活物質を含む負極活物質合剤層を有する負極と、非水電解質と、を備える非水電解質二次電池であって、負極活物質は、黒鉛粒子の表面が第１の非晶質炭素及び第２の非晶質炭素を含む被覆層で被覆された被覆黒鉛粒子を含み、負極活物質合剤層は、被覆黒鉛粒子と、導電剤としての第３の非晶質炭素とを含み、非水電解質は、ジフルオロリン酸塩、及びオキサレート錯体をアニオンとするリチウム塩を含む。【選択図】図１