title: Mixed Electronic and Ionic Conductor-Coated Cathode Material for High-Voltage Lithium Ion Battery.
abstract: A lithium ionic conductor, Li1.3Al0.3Ti1.7(PO4)3 (LATP), is introduced as a coating material on the surface of Mg-doped LiCoO2 to improve electrochemical performances for high-voltage (4.5 V) lithium ion batteries. Structure, morphology, elemental distribution, and electrical properties of the materials are thoroughly characterized by SEM, TEM, EELS, EDS, and C-AFM. The coating layer is electrically conductive with the aid of Mg ions which are used as a dopant for the active materials; therefore, this mixed electronic ionic conductor strongly enhances the electrochemical performances of initial capacity, cycling property, and rate capability. The LATP coating layer also demonstrates very promising applicability for 4.4 V prismatic full cells with graphite anode, which correspond to the 4.5 V half-cells with lithium anode. The 2900 mA h full cells show 85% of capacity retention after 500 cycles and more than 60% after 700 cycles.
authors.affiliation: Battery R&D Center, Samsung SDI , Suwon, Gyunggido 16677, Republic of Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Shim
authors.affiliation: Battery R&D Center, Samsung SDI , Suwon, Gyunggido 16677, Republic of Korea.
authors.forename: Jung-Min
authors.initials: JM
authors.lastname: Han
authors.affiliation: Automotive & ESS Business, Samsung SDI , Yongin, Gyunggido 17084, Republic of Korea.
authors.forename: Joon-Hyung
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of BioNano Technology, Gachon University , Seongnam, Gyunggido 13120, Republic of Korea.
authors.forename: Sanghun
authors.initials: S
authors.lastname: Lee
keywords: full cell application; high-voltage cell; lithium cobalt oxide; lithium ion battery; mixed electronic and ionic conductor