Spinel type Co3O4 is substituted to improve {HEAD ~ electronic conductivity}, improving {TAIL ~ battery performance} 
improving
Spinel type Co3O4 is substituted to improve { HEAD ~ electronic conductivity } , improving { TAIL ~ battery performance }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL