摘要
采用干法高能球磨-一步固相反应合成LiFe1-xMgxPO4(x=0,0.01,0.05,0.10和0.20)正极材料。利用X射线衍射仪、扫描电镜和能量色散谱表征样品的晶体结构、形貌和Mg元素分布,并研究Mg掺杂量对LiFePO4材料电化学性能的影响。结果表明,制备的LiFe1-xMgxPO4(0≤x≤0.10)为纯相,且LiFe1-xMgxPO4(x=0,0.01,0.05,0.10和0.20)晶粒尺寸随掺杂量的增大而增大。LiFe0.99Mg0.01PO4的放电容量最佳,室温0.1C倍率下充放电其首次放电容量为150.8 mA.h/g,即使在1C倍率下放电时也有129.9 mA.h/g的容量,循环性能较好。
LiFe1-xMgxPO4（x = 0, 0.01, 0.05, 0.10 and 0.20） cathode materials were synthesized by one-step solid-state reaction combined a dry high-energy ball milling. The crystalline structure, morphology and Mg distribution were characterized by XRD, SEM and EDS. The effect of amount of doped-Mg on the electrochemical properties of LiFe1-xMgxPO4 was investigated. The results show that the prepared LiFe1-xMgxPO4（0≤x≤0.10） is pure, and with the increasing ofx value, the crystalline size of LiFe1-xMgxPO4 （x=0, 0.01, 0.05, 0.10 and 0.20） increases. LiFe1-xMgxPO4 sample has higher charge and discharge capacities than other samples o The initial discharge specific capacity of LiFe1-xMgxPO4 is 150.8 mA.h/g at 0.1 C and ambient temperature, 129.9 mA.h/g at IC, showing that it has good cycling behavior.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第6期1123-1128,共6页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展计划资助项目(2007CB613607)
