摘要
采用螯合辅助球磨法制备了LiFePO4/C复合材料,研究了不同的螯合剂(乙二胺四乙酸(EDTA),草酸,柠檬酸)对前驱体以及LiFePO4/C复合材料性能的影响。结果表明:LiFePO4/C复合材料的性能与螯合剂密切相关。螯合剂的螯合能力越强,球磨过程中前驱体颗粒越小,均匀程度越好,由此可提高LiFePO4/C复合材料的电化学性能。相比草酸和柠檬酸,采用乙二胺四乙酸作为螯合剂所制备的样品拥有更好的电化学性能,其在150 mA/g和1 500mA/g的电流密度下的可逆充放电比容量分别为155.5 mAh/g和102 mAh/g。
LiFePO4/C composites were synthesized by chelation assisted ball-mill method. Different chelates（EDTA, oxalic acid and citric acid） were added into the ball-mill system to investigate their effects on the properties of the precursors and the synthesized LiFePO4/C composites. The results show that the properties of composites are closely related to the chelates. The chelates with stronger chelate ability could make the ball-mill process more efficiently. Consequently, the better electrochemical properties could obtain by using chelates with stronger chelate ability during ball-mill process. The sample prepared with EDTA as chelate has better electrochemical performances than that prepared with oxalid acid or citric acid as chelates, and shows reversible specific capacities of 155.5 mAh/g and 102 mAh/g at the current densities of 150 mA/g and 1 500 mA/g.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2014年第10期32-35,共4页
Electronic Components And Materials
基金
贵州省科学技术基金资助项目(No.2013]2302)
