摘要
采用固相反应法在惰性气氛中合成了橄榄石型L iFePO4/C复合正极材料,考察了焙烧温度对目标材料性能的影响.采用XRD、SEM、TG-DSC、激光粒度分布以及电化学测试等手段对该材料进行了结构表征和性能测试.结果表明,完美的结晶、较小的粒径以及与导电剂的良好接触是产物具有优良电化学性能的保证.于750℃下制得产物的结构完整,表面形貌较好,粒经分布均匀,具有良好的电化学性能.在室温及0.05 C充放电倍率下,该材料的首次放电容量为142.5 mA.h/g,循环50次后,未见明显衰减.
Olivine LiFePO4/C composite anode materials were synthesized by a solid state method in an inert atmosphere. The effects of the calcined temperature on the properties of as-synthesized anode materials were investigated. The crystal structure and the electrochemical performance were characterized by XRD, SEM, TG-DSC, laser particle-size distribution measurement and electrochemical performance testing. The results demonstrate that pure and well-crystallized powders, smaller particle size and intimate carbon contact are necessary for optimizing electrochemical performance. The material calcined at 750 ℃ had a complete olivine structure, uniform surface morphology, better particle-size distribution and excellent electrochemical performances. The initial discharge capacity, namely 142.5 mA ·h/g, was obtained at room temperature and 0.05℃ charge-dischange rate. After 50 cycles, there was no obvious capacity fade.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第10期1905-1908,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20273047)资助.
作者简介
联系人简介：唐致远（1946年出生），男，教授，主要从事应用电化学研究。E-mail：zytang@tju．edu．cn
