The effect of AlF₃ modification on the physicochemical and electrochemical properties of Li-rich layered oxide

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• 作者：Shengli Pang^a ; ^{slpang@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yonggang Wang^a ; Tao Chen^a ; Xiangqian Shen^a ; ^{shenxq@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaoming Xi^b ; Daqian Liao^b
• 关键词：Li-ion battery ; Cathode material ; Li-rich layered oxide ; Surface coating
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：42
• 期：4
• 页码：5397-5402
• 全文大小：2417 K

文摘

Lithium (Li)-rich layered oxides are considered promising cathode materials for Li-ion batteries because of their favorable properties. Here, we report our recent finding in the novel oxide, aluminum fluoride (AlF₃)-modified Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ (LMNCAF), which was synthesized via a facile, cost-effective and readily scalable solid-state reaction. LMNCAF possess an F and Al co-doped core structure with a LiF nano-coating on its surface which leads to considerably enhancement in the electrochemical performance of the oxide. The initial discharge capacity (at 0.05 C) increased from 212 mA h g⁻¹ for Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ to 291 mA h g⁻¹ for LMNCAF. A much higher discharge capacity of 211 mA h g⁻¹ was obtained for LMNCAF after 99 charge/discharge cycles at 0.2 C compared with that of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ (160 mA h g⁻¹). Our preliminary results suggest that AlF₃ modification is an effective strategy to tailor the physicochemical and electrochemical properties of Li-rich layered oxides.