WOUND TYPE NONAQUEOUS LITHIUM POWER STORAGE ELEMENT

PROBLEM TO BE SOLVED: To provide a nonaqueous lithium power storage element arranged so as to be able to suppress the transfer of lithium ions to a non-opposed portion of a negative electrode, which hardly makes contribution to charge and discharge reactions in a wound type power storage element, and having a superior energy density and high input/output characteristics, and the durability against high-load charge and discharge cycles.SOLUTION: A nonaqueous lithium power storage element comprises: a positive electrode including a lithium compound; and a negative electrode having an opposed portion 6 and a non-opposed portion 10. Controlling the amount of a chemical substance in a coating at a negative electrode interface in an opposed portion, and a negative electrode interface in a non-opposed portion allows the nonaqueous lithium power storage element to have a superior energy density, a high input/output characteristics, and durability against high-load charge and discharge cycles.SELECTED DRAWING: Figure 1 【課題】捲回式の蓄電素子における充放電反応に寄与しにくい負極の非対向部へのリチウムイオンの移動を抑制し、優れたエネルギー密度と高い入出力特性を有し、さらに高負荷充放電サイクルに対する耐久性を備えた非水系リチウム型蓄電素子の提供。【解決手段】正極にリチウム化合物を含み、対向部６における負極界面と非対向部１０における負極界面の被膜中の化学物量を制御することで、優れたエネルギー密度と高い入出力特性を有し、さらに高負荷充放電サイクルに対する耐久性を備えた非水系リチウム型蓄電素子。【選択図】図1