Thermal stability of LiFePO₄/C-LiMn₂O₄ blended cathode materials

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• 作者：YuanChao Du ; XiaoPeng Huang ; KeYu Zhang ; Feng Liang…
• 关键词：LiFePO4/C ; LiMn2O4 blended cathode materials ; impurity phases ; thermal stability
• 刊名：Science China Technological Sciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：60
• 期：1
• 页码：58-64
• 全文大小：1609KB
• 刊物类别：Engineering
• 刊物主题：Engineering, general;
• 出版者：Science China Press
• ISSN：1869-1900
• 卷排序：60

文摘

Safety is important to lithium ion battery materials. The thermal stability of LiFePO₄/C-LiMn₂O₄ blended cathode materials is characterized by using TG, XRD, and SEM etc. The results show that LiFePO₄/C-LiMn₂O₄ possesses a worse thermal stability than pure spinel LiMn₂O₄ and pure olivine LiFePO₄/C. When LiFePO₄/C-LiMn₂O₄ blended cathode materials are sintered at 500°C under Ar atmosphere, the sintered cathode materials emit O₂, and appear impurity phases (Li₃PO₄, Fe₂O₃, Mn₃O₄). It is deduced that some chemical reactions take place between different materials, which leads to a worse discharge specific capacity. LiFePO₄/C-LiMn₂O₄ blended cathode materials, therefore, need to be managed and controlled strictly for the sake of thermal stability and safety.