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

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• 作者：Jae-Hyun Shim ; Jung-Min Han ; Joon-Hyung Lee ; Sanghun Lee
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：8
• 期：19
• 页码：12205-12210
• 全文大小：532K
• 年卷期：0
• ISSN：1944-8252

文摘

A lithium ionic conductor, Li_1.3Al_0.3Ti_1.7(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.