Lithium deficient mesoporous Li_{2鈭?span style='font-style: italic'>x}MnSiO₄ with significantly improved electrochemical performance

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• 作者：Haiyan Wang ; Tianli Hou ; Dan Sun ; Xiaobing Huang ; Hanna He ; Yougen Tang ; Younian Liu
• 关键词：Li-ion batteries ; Lithium manganese silicate ; Lithium deficient chemistry ; Mesoporous structure ; Electrochemical performance
• 刊名：Journal of Power Sources
• 出版年：1 February, 2014
• 年：2014
• 卷：247
• 期：Complete
• 页码：497-502
• 全文大小：1754 K

文摘

Li_2鈭?em>xMnSiO₄ compounds with mesoporous structure are first proposed in the present work. It is interesting to note that the lithium deficient compounds exhibit much higher electrochemical performance in comparison with the stoichiometric one. Among these compounds, Li_1.8MnSiO₄ shows the best electrochemical performance. It is found that mesoporous Li_1.8MnSiO₄ without carbon coating delivers a maximum discharge capacity of 110.9聽mAh聽g^鈭? at 15聽mA聽g^鈭?, maintaining 90.8聽mAh聽g^鈭? after 25 cycles, while that of the stoichiometric one is only 48.0聽mAh聽g^鈭?, with 12.5聽mAh聽g^鈭? remaining. The superior properties are mainly due to the great improvement of electronic conductivity and structure stability, as well as suppressed charge-transfer resistance.