Mixed Electronic and Ionic Conductor-Coated Cathode Material for High-Voltage Lithium Ion Battery

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 mater...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2016-05, Vol.8 (19), p.12205-12210
Main Authors: Shim, Jae-Hyun, Han, Jung-Min, Lee, Joon-Hyung, Lee, Sanghun
Format: Article
Language:English
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Summary: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.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.6b03113