(1. 中南大学 化学化工学院，长沙 410083；
2. 肇庆学院 化学化工学院，肇庆 526061；
3. 中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 以FePO4、Li2CO3和葡萄糖为原料，用液氮急速淬火法制备单一橄榄石结构的锂离子电池正极材料LiFePO4/C。结果表明：淬火使得LiFePO4晶格中产生Li空位，有利于提高其电子导电性。淬火样品的一次颗粒细小(100~500 nm)，无明显团聚，并形成多孔结构；该样品在1C、2C和4C倍率下的首次放电比容量分别为151.4、138.0和116.7 mA·h/g，循环100次后的容量保持率高达99.3%、98.6%和94.5%。
关键字: 锂离子电池；正极材料；磷酸铁锂；液氮；淬火
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. College of Chemistry and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China;
3. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:A single olivine-type LiFePO4 was synthesized by liquid nitrogen rapid quenching method, using FePO4, Li2CO3 and glucose as raw materials. XRD refinement results indicate that rapid quenching leads to the formation of a number of Li vacancies in LiFePO4 crystals. These defects are beneficial to improving the electronic conductivity of LiFePO4. The quenched sample shows the primary particles size of 100−500 nm. The p, articles exhibit little agglomeration, and form a porous structure. The sample exhibits an initial discharge capacity of 151.4, 138.0 and 116.7 mA·h/g at 1C, 2C and 4C rate, and shows the capacity retention of 99.3%, 98.6% and 94.5% after 100 cycles, respectively.
Key words: lithium-ion batteries; cathode materials; lithium iron phosphate; liquid nitrogen; quenching
