锂离子电池正极材料LiV_(3-x)Co_xO_8合成及性质  

Hydrothermal Synthesis and Properties of LiV_(3-x)Co_xO_8 As Cathode Material for Lithium-Ion Batteries

作　　者：冯季军[1,2] 李水华[2] 郭超[2] 李巧园[2] 

机构地区：[1]山东大学化学与化工学院,山东济南250100 [2]济南大学化学化工学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2011年第4期358-361,共4页Journal of University of Jinan(Science and Technology)

基　　金：山东省自然科学基金(Y2008B64)

摘　　要：水热法制备Co掺杂改性的锂离子电池层状正极材料LiV3-xCoxO8。经X射线衍射和扫描电镜分析表征材料的晶体结构和形貌,恒流充放电循环测试其电化学性能,结果表明:随着Co掺入量增加,材料初始放电容量有所降低,但循环性能得到明显改善,当掺杂量控制在0.01≤x≤0.08范围内时,LiV3-xCoxO8材料的循环性能和充放电可逆性均比未掺杂LiV3O8材料有明显改善。其中,LiV2.99Co0.01O8和LiV2.97Co0.03O8在40次循环之后,都能保持146 mAh.g-1的放电比容量。Cobalt doped lithiated vanadium oxides LiV3-xCoxO8 as a promising cathode material for secondary lithium batteries are prepared with the hydrothermal method. The crystal structure and morphology are characterized by powder X-ray diffraction and scanning electron microscope. The electrochemical properties of synthesized samples are investigated by galvanostatic charge and discharge eye- ling. With x increasing,the initial capacity of LiV3-xCoxO8 decreases to some extent. On the other hand, the cycle ability of Co doped LiV3-xCoxO8 are greatly improved. All the LiV3-x MnxO8 materials take on better cycle performance and reversibility than pristine LiV3 0s when 0.01≤x≤0.08. Among them, LiV2.99 Co0.01 Os and LiV2.97 Coo. 03 Os preserve as high specific capacity as 146 mAh · g ^- 1 after 40 cycles.

关 键 词：锂离子电池 正极材料 LIV3O8 掺杂改性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]