FeF_(3)的改性制备及其电化学性能研究  

Preparation and Electrochemical Properties of Modified FeF_(3)

作　　者：杜鹏 阎子豪 黄朔[1] 陈拥军[1] 骆丽杰[1] 李建保[1] DU Peng;YAN Zihao;HUANG Shuo;CHEN Yongjun;LUO Lijie;LI Jianbao(State Key Laboratory of Marine Resources Utilization in the South China Sea,School of Material Science and Engineering,Hainan University,Haikou 570228,Hainan,China)

机构地区：[1]海南大学材料科学与工程学院,南海海洋资源利用国家重点实验室,海南海口570228

出　　处：《陶瓷学报》2023年第2期279-288,共10页Journal of Ceramics

基　　金：国家自然科学基金(51702072)。

摘　　要：近年来,FeF_(3)材料因其低廉的成本和高电压平台成为一种极具前景的无锂正极材料。通过调控FeF_(3)制备工艺,制备纳米管状结构的FeF_(3)。对FeF_(3)的微观结构、表面形貌、晶体结构、物相组成等理化性质进行了表征分析,对用其组装的扣式锂离子半电池进行了电化学测试。当电流密度为15 mA·g^(-1)时,电池充放电比容量可达到130 mAh·g^(-1)。对比不同电流密度下的比容量,发现当电流密度从15mA·g^(-1)升至600mA·g^(-1)时,电池平均充放电比容量衰减较小,表现出良好的倍率性能。在600mA·g^(-1)电流密度下充放电循环100圈,电池库伦效率可保持在100%左右,容量保持率约为95%,表明了电池的循环稳定性。此外,还将CoSe_(2)与FeF_(3)纳米管进行了复合,探讨复合CoSe_(2)对电极电化学性能的影响。结合实验测试结果,通过理论分析,验证了纳米管状的FeF_(3)材料具有优异的电化学性能,CoSe_(2)的复合能够有效提升电池的倍率性能和长循环稳定性,降低反应中的电化学阻抗。In recent years,FeF_(3)has become a promising lithium-free cathode material,due to its low cost and relatively high voltage platform.The preparation of FeF_(3)with nanotubular structure by regulating the preparation process is reported.Physicochemical properties of FeF_(3),such as microstructure,surface morphology,crystal structure and phase composition,were characterized and analyzed.Electrochemical tests were performed with coin-type lithium-ion half batteries.At current density of 15 mA·g^(-1),the battery reached a charge/discharge specific capacity of 130 mAh-g^(-1).When the current density is varied from 15 to 600 mA·g^(-1),by comparing the specific capacities at difierent current densities,it was found that the average charge/discharge specific capacity of the battery was just slightly decayed,showing high rate performance.At current density of 600 mA·g^(-1),the Coulomb efficiency of the battery was maintained at near 100%and the capacity retention rate was about 95%,indicating cycle stability of the battery.Moreover,CoSe_(2)was compounded with the FeF_(3)nanotubes to further enhance the electrochemical perfbnnance of the battery.Both experimental theoretical results verified that It was experimentally and theoretically verified that FeF_(3)with nanotubular structure exhibited excellent electrochemical performance,which was further boosted by forming composite with CoSe_(2).

关 键 词：锂离子电池 FeF_(3) 纳米管 CoSe_(2) 改性 电化学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]