Electrochemical properties and interfacial reactions of LiNi_0.5Mn_1.5O_4?¦Ä nanorods

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• 作者：Liping Wang ; Hong Li ; Xuejie Huang
• 关键词：Lithium ion battery ; High voltage spinel ; Nanorods ; Surface reaction
• 刊名：Progress in Natural Science
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：22
• 期：3
• 页码：207-212
• 全文大小：1272 K

文摘

LiNi_0.5Mn_1.5O_4?¦Ä which possesses a high voltage of 4.7 V vs. Li⁺/Li and stable structure has been considered as a promising cathode material for high energy Li-ion batteries. In this study, well-crystallized LiNi_0.5Mn_1.5O_4?¦Ä nanorods with diameter of ¡«50 nm and length of ¡«500 nm were synthesized by a hydrothermal-solid state process followed by a lithiation reaction. It delivers ¡«120 mA h g^?1 discharge capacity under 30 mA g^?1 at 3.5-4.9 V, and 90 mA h g^?1 at 150 mA g^?1. An unstable solid electrolyte interphase (SEI) film with thickness 2-10 nm was observed by transmission electron microscopy. The thick and unstable SEI layers are responsible for its low rate performance and low coulombic efficiency during cycling.