Improving the High-Voltage Li2FeMn3O8 Cathode by Chlorine Doping

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• 作者：Jiaqi Dai ; Lihui Zhou ; Xiaogang Han ; Marcus Carter ; Liangbing Hu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：8
• 期：17
• 页码：10820-10825
• 全文大小：461K
• 年卷期：0
• ISSN：1944-8252

文摘

High-capacity and high-voltage cathode materials are desirable for high-energy-density lithium ion batteries. Among various cathode materials, Li₂FeMn₃O₈ is attractive due to its high working voltage, low toxicity, and low cost. However, its superior electrochemical properties are significantly limited by the intrinsic defects in the Li₂FeMn₃O₈ cathode, which makes the theoretical working voltage (4.9 V) and capacity (148 mAh/g) hard to reach. In this paper, we demonstrated that Cl doping can effectively increase the capacity and working voltage of the Li₂FeMn₃O₈ cathode. X-ray photoelectron spectroscopy reveals that Cl doping reduced the valence state and increased the electron binding energy in cations and thus increased the voltage and enhanced the capacity of the Li₂FeMn₃O₈ cathode. Our results also indicate that Cl doping can be a promising low-cost method to improve the electrochemical performance of various oxide cathode materials, including LiCoO₂ and LiMn₂O₄.