【作者】 梁风； 戴永年； 姚耀春； 易惠华； 于逢婕； 胡成林； 廖文明；

【Author】 Liang Feng~(1,2),Dai Yongnian~(1,2),Yao Yaochun~(1,2*),Yi Huihua~(1,2),Yu Fengjie~(1,2),Hu Chenglin~(1,2),Iiao Wenming~(1,2) (1.Faculty of Materials and Metallurgical Engineering,Kunming University of Science and Technology,Kunming,650093,China; 2.National Engineering Laboratory cf Vacuum Metallurgy,Kunming,650093,China)

【机构】 昆明理工大学材料与冶金工程学院； 真空冶金国家工程实验室；

【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LiFePO₄。并结合XRD、SEM、N₂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LiFePO₄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%。更多还原

【Abstract】 The nanostructured LiFePO₄ 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 adsoiption/desorption and charge-discharge test.The results show that the surfactant template is responsible for high quality,nano-structured,self-assembled LiFePO₄ 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%.更多还原