【作者】 李宇展； 周震； 任俊霞； 叶超； 高学平； 阎杰；

【Author】 LI Yu-zhan, ZHOU Zhen, REN Jun-xia, YE Chao, GAG Xue-ping, YAN Jie (Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China; College of Chemistry, Nankai University, Tianjin 300071, China)

【机构】 南开大学新能源材料化学研究所； 南开大学化学学院；

【摘要】 通过球磨和研磨2种方法高温固相反应制备了锂离子二次电池正极材料LiVPO4F,用扫描电子显微镜、X射线衍射对其进行表征。LiVPO4 F属于三斜晶系。在0.2 C倍率下充放电,研磨得到的正极材料LiVPO4 F第一次放电容量为123.1 mA·h/g,球磨后得到的正极材料LiVPO4F放电容量为116.5 mA·h/g,但循环50次后, 球磨后得到的LiVPO4F的放电容量达到98.9 mA·h/g,衰减比较慢,比研磨后得到的LiVPO4F容量要高28.9 mA·h/g。实验结果表明:球磨后得到的正极材料LiVPO4F循环性能得到了改进,且放电平台较高。更多还原

【Abstract】 Cathode material. LiVPO4F, was synthesized by two steps solid-state reactions by using ball mill and grind. The product LiVPO4F was characterized by X-ray diffractrometry, scanning electron microscopy and charge/ discharge testing measurements. The product LiVPO4F is triclinic crystalline system. At 0. 2 C rate, the first discharge capacities of the sample LiVPO4F prepared by ground and ball mill are 123. 1 and 116. 5 mA·h/g, respectively. But after 50 cycles, the discharge capacity of the sample LiVPO4F prepared by ball mill is 98. 9 mA·h/ g and fading is slow. The sample LiVPO4 F prepared by ball mill has higher discharge voltage.更多还原