(中南大学 冶金科学与工程学院, 长沙 410083)
摘 要: 用共沉淀法制备掺钛前驱体FePO4·2H2O，对FePO4·2H2O经常温还原插锂合成LiFePO4的前驱混合物，后经热处理得橄榄石型LiFePO4；用SEM，XRD和恒流充放电等对样品进行表征，考察Ti掺杂和合成温度对LiFePO4的物理和电化学性能的影响。研究结果表明，在600 ℃时合成的Ti掺杂样品具有优异的电化学性能，该样品在0.1C，1C和2C倍率下的首次放电比容量分别为150，130和125 mA∙h/g，循环40次后的放电比容量均无衰减。
关键字: 锂离子电池；LiFePO4；共沉淀；常温还原；钛掺杂
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Ti-doped precursors (FePO4·2H2O) were prepared by co-precipitation method. Olivine-type LiFePO4 were synthesized by sintering the LiFePO4 precursor-mixtures which were obtained via reduction and lithiation of FePO4·2H2O at room temperature. The samples were characterized by scanning electron microscopy, X-ray diffractometry and electrochemical charge and discharge tests. Effects of Ti-doping and sintering temperature on physical and electrochemical performance of LiFePO4 were investigated. The results show that the Ti-doped sample sintered at 600 ℃ has excellent electrochemical performance. Its initial discharge capacities are 150, 130 and 125 mA∙h/g at 0.1C, 1C and 2C rates, respectively, and no capacity fading is found after 40 cycles.
Key words: lithium ion battery; LiFePO4; co-precipitation; room temperature reduction; Ti-doping
