模板法合成有孔的锂离子电池正极材料LiFePO_4/C  

Synthesis of Porous Structure LiFePO_4/C as Cathode Material for Lithium-ion Batteries

作　　者：梁风[1,2] 戴永年[1,2] 姚耀春[1,2] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650093 [2]真空冶金国家工程实验室,昆明650093

出　　处：《无机化学学报》2010年第9期1675-1679,共5页Chinese Journal of Inorganic Chemistry

基　　金：云南省自然科学基金(NoKKSA200927049)资助项目

摘　　要：橄榄石型LiFePO4因其具有170mAh·g-1的理论容量,3.4V的放电平台,良好的循环性能和热稳定性能,无毒和价格低廉等优点,自1997年被Goodenough等[1]首次报道以来受到人们广泛关注[2-3],并被认为在动力电池应用上极有潜力[4]。但此材料的电导率低及扩散性能差[1],限制其大规模应用。针对上述缺点研究人员对LiFePO4的改性研究主要包括：包覆碳[5-7]和金属粉末[8]、掺杂金属离子、合成纳米级的LiFePO4颗粒等方法。Porous structure LiFePO4/C was synthesized by using triblock copolymer P123 as template combined with the self-assembly method. The crystal structure and electrochemical performance of synthesized samples were characterized by XRD, SEM, Nitrogen adsorption-desorption test, and charge-discharge test. The structure and electrochemical performance of the samples synthesized at different calcination times were studied. Results showed that the porous structure LiFePO4 /C sample prepared at 700 ℃ for 12 h had the best electrochemical performance, the first discharge capacity was 151.27 mAh·g-1 at 0.1C rate, and its electrochemical performance was better than the LiFePO4/C sample without porous structure.

关 键 词：有孔LiFePO4/C 模板法 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动] O646.54[理学—物理化学]