ADDITIVE FOR NON-AQUEOUS SECONDARY BATTERY, NON-AQUEOUS ELECTROLYTE FOR NON-AQUEOUS SECONDARY BATTERY, ELECTRODE FOR NON-AQUEOUS SECONDARY BATTERY AND NON-AQUEOUS SECONDARY BATTERY

To provide an additive for a non-aqueous secondary battery and a non-aqueous electrolyte for a non-aqueous secondary battery, an electrode for a non-aqueous secondary battery, and a non-aqueous secondary battery, capable of maintaining good capacity retention after repeated charge and discharge cycles over a long-term cycle, excellent in cycle characteristics.SOLUTION: The additive for a non-aqueous secondary battery includes at least one component (A) represented by chemical formula (1), a phosphate ester salt represented by chemical formula (2), a halophosphate ester salt represented by chemical formula (3), and at least one component (B) selected from the group consisting of a phosphate and a metal halide salt. The additive can be included in the non-aqueous electrolyte for a non-aqueous secondary battery and the electrode for a non-aqueous secondary battery.SELECTED DRAWING: Figure 1 【課題】長期サイクルにわたって充放電を繰り返した後の容量維持率を良好に維持し、サイクル特性に優れた非水系二次電池用添加剤、非水系二次電池用非水電解液、非水系二次電池用電極及び非水系二次電池を提供する。【解決手段】本発明に係る非水系二次電池用添加剤は、化学式（１）で表される、少なくとも一種の成分（Ａ）と、化学式（２）で表されるリン酸エステル塩、化学式（３）で表されるハロリン酸エステル塩、リン酸塩及びハロゲン化金属塩からなる群より選ばれる少なくとも１種の成分（Ｂ）と、を含有することを特徴とし、非水系二次電池用非水電解液及び非水系二次電池用電極に含有させることができる。【選択図】 図１