Facile Lithium Ion Transport through Superionic Pathways Formed on the Surface of Li3V2(PO4)3/C for High Power Li Ion Battery

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• 作者：Dong-Wook Han ; Sung-Jin Lim ; Yong-Il Kim ; Seung Ho Kang ; Yoon Cheol Lee ; Yong-Mook Kang
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：June 24, 2014
• 年：2014
• 卷：26
• 期：12
• 页码：3644-3650
• 全文大小：398K
• ISSN：1520-5002

文摘

We report a new discovery for enhancing Li ion transport at the surface of Li₃V₂(PO₄)₃ particles through superionic pathways built along an ionic conductor. The Li₃V_1.95Zr_0.05(PO₄)₃/C composite has much higher initial discharge capacity, superior rate-capability, and excellent cycling performance when compared with pristine Li₃V₂(PO₄)₃/C. This is partly due to the occupation of vanadium sites by Zr⁴⁺ ions in the Li₃V₂(PO₄)₃ host crystals and facile Li ion migration through a LiZr₂(PO₄)₃-like secondary phase that forms on the surface of the Li₃V_1.95Zr_0.05(PO₄)₃ particles. Our findings about high Li ion transport and structure stabilization induced by Zr incorporation suggests a breakthrough strategy for achieving high-power Li rechargeable batteries using NASICON-structured cathode materials in combination with nanoarchitecture tailoring.