POSITIVE ELECTRODE ACTIVE MATERIAL FOR HIGH VOLTAGE, COMPRISING LITHIUM MANGANESE-BASED OXIDE, AND PRODUCTION METHOD THEREFOR

WIPO Patent Application WO/2019/066298

A8

The present invention provides a positive electrode active material comprising a lithium-rich lithium manganese-based oxide, wherein the lithium manganese-based oxide has a composition represented by chemical formula (1) below, and the surfaces of the particles of the lithium manganese-based oxide have formed thereon a lithium ion-conductive glass-ceramic solid electrolyte layer comprising at least one type selected from the group consisting of a thio-lithium super ionic conductor (thio-LISICON), a lithium super ionic conductor (LISICON), Li2S-SiS2-Li4SiO4 and Li2S-SiS2-P2S5-Lil. Li1+xMyMn1-x-yO2-zQz (1). Here, 0