SEKUNDÄRBATTERIE MIT WASSERFREIEM ELEKTROLYT UND HERSTELLUNGSVERFAHREN DAFÜR

摘要

A mixed positive electrode active material is used. The mixed positive electrode active material is obtained by mixing a layered oxide whose initial charge-discharge efficiency when lithium metal is used for a counter electrode is less than 100 % (hereinafter referred to as a first layered oxide) and a layered oxide whose initial charge-discharge efficiency is 100 % or more (hereinafter referred to as a second layered oxide). Examples of the first layered oxide include Li 1+a Mn x CO y Ni z O 2 . A sodium oxide such as Li A Na B Mn X Co Y Ni Z O 2 other than a layered compound from which lithium is previously extracted by acid treatment or the like can be used as the second layered oxide whose initial charge-discharge efficiency is 100 % or more. A layered oxide obtained by replacing (ion exchange) sodium in the foregoing Li A Na B Mn X Co Y Ni Z O 2 with lithium can be also used as the second layered oxide.