模板法合成孔状纳米级锂离子电池正极材料LiFePO_4  

Template-Assisted Synthesize Nanostructured LiFePO_4 Positive Electrode of Li-Ion Batteries

作　　者：梁风[1,2] 戴永年[1,2] 姚耀春[1,2] 易惠华[1,2] 于逢婕 胡成林[1,2] 廖文明 

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：《真空科学与技术学报》2009年第S1期9-11,共3页Chinese Journal of Vacuum Science and Technology

摘　　要：采用表面活性剂为模板,通过分子自组装法合成了孔状纳米级锂离子正极材料LiFePO_4。并结合XRD、SEM、N_2吸附/脱附和充放电测试等手段,对合成材料的结构、形貌、孔的分布和电化学性能进行了分析。实验结果表明:表面活性剂为模板,通过高温烧结脱去可以形成纳米孔状的LiFePO_4正极材料,在以0.1mA的电流下放电,首次放电比容量有125.5mA·h/g,循环20次后其比容量仍有120mA·h/g,保持率达95.6%。The nanostructured IiFePO_4 positive electrode of Li-ion secondary batteries were synthesized by template assisted molecular self-assembly.Then the template was easily removed by high temperature sintering.The microstructures, morphology,and electrical properties of the electrode were characterized with X-ray diffraction(XRD),scanning electron microscopy(SEM),nitrogen adsorption/desorption and charge-discharge test.The results show that the surfactant template is responsible for high quality,nano-structured,self-assembled LiFePO_4 electrode.We found that the initial specific discharge capacity was 125.5mA·h/g;at a current of 0.1mA,the specific discharge capacity was found to be 120mA ?h/g,after 20 cycles and a rate of capacity fade was 4.4%.

关 键 词：锂离子电池 LiFePO₄ 正极材料 模板法 纳米颗粒 

分 类 号：O611.4[理学—无机化学]