NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a battery arranged so that the expansion owing to gas generation or the capacity drop after high temperature storage can be suppressed.SOLUTION: The nonaqueous electrolyte secondary battery comprises: a positive electrode capable of occluding and releasing metal ions; a negative electrode including a negative electrode active material capable of occluding and releasing metal ions; and a nonaqueous electrolyte solution containing a nonaqueous solvent, and an electrolyte dissolved in the nonaqueous solvent. The negative electrode active material includes an active material (A) which allows the metal ions to go thereinto and out thereof, and a compound (B). The compound (B) is poorly soluble in the nonaqueous electrolyte solution, and has at least one functional group selected from a group consisting of a hydroxyl group, a carboxyl group, a boric acid group, a primary amino group, a secondary amino group, a tertiary amino group, a mercapto group, a sulfide group, a sulfino group, a sulfinato group, a sulfo group, a phosphate group and a phosphonic acid group. In the nonaqueous electrolyte secondary battery, the electrolyte solution contains at least a compound (D) of a particular chemical structure.SELECTED DRAWING: None 【課題】本発明は、ガス発生による膨張或いは高温保存後の容量低下を抑制した電池を提供することを目的とする。【解決手段】 金属イオンを吸蔵及び放出可能な正極と、金属イオンを吸蔵及び放出可能な負極活物質を含む負極と、非水系溶媒と該非水系溶媒に溶解される電解質を含む非水系電解液とを備える非水系電解液二次電池であって、上記負極活物質は金属イオンの挿入・脱離が可能な活物質（Ａ）と、化合物（Ｂ）とを含有し、前記化合物（Ｂ）が非水系電解液に難溶であり、且つヒドロキシル基、カルボキシル基、ホウ酸基、一級アミノ基、二級アミノ基、三級アミノ基、メルカプト基、スルフィド基、スルフィノ基、スルフィナト基、スルホ基、リン酸基、又はホスホン酸基からなる群より選ばれる少なくとも１種の官能基を有し、上記電解液が少なくとも特定の化学構造の化合物（Ｄ）を含有する、非水系電解液二次電池に関する。【選択図】なし