Transport properties of LiCoPO₄ and Fe-substituted LiCoPO₄

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• 作者：Jan L. Allen ; Travis Thompson ; Jeff Sakamoto ; Collin R. Becker ; T. Richard Jow ; Jeff Wolfenstine
• 关键词：Li-ion ; Battery ; Cathode ; Ionic ; Electronic ; Conductivity
• 刊名：Journal of Power Sources
• 出版年：15 May, 2014
• 年：2014
• 卷：254
• 期：Complete
• 页码：204-208
• 全文大小：1159 K

文摘

LiCoPO₄ is a promising cathode material to enable high energy, abuse tolerant Li-ion batteries. However, LiCoPO₄ has relatively poor electronic conductivity which may be improved by chemical substitution. In this work, the ionic and electronic conductivities of dense, polycrystalline LiCoPO₄ and Fe²⁺/Fe³⁺-substituted LiCoPO₄ (Li_1鈭?em>xCo_0.9Fe_0.1PO₄) are measured and compared. Both materials are predominantly ionic conductors with relatively good bulk ionic and relatively poor electronic conductivities. Li_1鈭?em>xCo_0.9Fe_0.1PO₄ exhibits both higher bulk ionic and electronic conductivity. The increased bulk ionic conductivity of Li_1鈭?em>xCo_0.9Fe_0.1PO₄ is believed to originate mainly from extra Li vacancies and the increased electronic conductivity is believed to originate mainly from creating more mobile hole polarons compared to LiCoPO₄ as a result of Fe²⁺/Fe³⁺ substitution.