Synthesis and characterization of Li_1.05Co_1/3Ni_1/3Mn_1/3O_1.95X_0.05 (X = Cl, Br) cathode materials for lithium-ion battery

详细信息    查看全文

• 作者：Yuhong Chen ; Qishuai Jiao ; Liang Wang ; Yawei Hu ; Na Sun ; Yushuang Shen ; Yuhua Wang
• 关键词：Lithium-ion batteries ; Cathode materials ; Cl-doped ; Br-doped
• 刊名：Comptes Rendus Chimie
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：16
• 期：9
• 页码：845-849
• 全文大小：1424 K

文摘

In order to improve the thermal stability and dynamic performance of LiCo_1/3Ni_1/3Mn_1/3O₂ materials, Cl-doped and Br-doped materials were synthesized via the co-precipitation method. The morphology, structure, electrochemical performance and thermal stability were characterized by environment scanning electron microscopy (ESEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), charge-discharge cycling and differential scanning calorimetry (DSC). Results show that all materials had a stable layered structure with ¦Á-NaFeO₂ and that Cl-doping slightly increased the size of grains. Both Cl-doping and Br-doping improved the high rate of discharge capacity, cycle-life performance and thermal stability, but Cl-doping was better than Br-doping in improving the material structure stability, dynamic performance and thermal stability.