碳包覆LiFePO4正极材料的改进碳热固相法合成

化工进展

碳包覆LiFePO4正极材料的改进碳热固相法合成

朱令之，王晨旭，韩恩山，杨津

河北工业大学化工学院，天津 300130

出版日期:2010-10-05 发布日期:2010-10-05

Synthesizing of carbon wrapped LiFePO4 cathode material via improved solid state-carbothermal reations

ZHU Lingzhi，WANG Chenxu，HAN Enshan，YANG Jin

Depertmant of Applied Chemistry，School of Chemical Engineering and Technology，Hebei University of Technology，Tianjin 300130，China

Online:2010-10-05 Published:2010-10-05

摘要/Abstract

摘要：

使用改进的固相法，用LiOH·H₂O、LiCO₃作锂源，制备LiFePO₄/C正极材料，得出使用氢氧化锂作为原料合成的产物电化学性能较好。以氢氧化锂为锂源，无水葡萄糖为碳前体，考察锂铁比、葡萄糖加入量、焙烧温度、焙烧时间四因素对LiFePO₄正极材料电化学性能的影响。使用TG/DSC、XRD、SEM、充放电测试对合成产物进行结构及电化学性能分析。结果表明，焙烧温度对于产物的影响最大。锂铁比为1.05∶1，每摩尔铁中加入葡萄糖量为1.50 g时产品容量最高，为135.0 mAh/g。最佳焙烧温度为600～650 ℃，最佳焙烧时间为10～15 h。改进的固相法避免使用球磨机，有利于工业化生产。

Abstract:

LiFePO₄/C cathode materials were synthsized by improved solid state-carbothermal reactions using LiOH·H₂O and LiCO₃. The electrochemical performance of products synthsized by using lithium hydroxide was better. Using lithium hydroxide as the lithium source and anhydrous glucose as the carbon precursor，preparation of LiFePO₄/C cathode materials were investigated by varying the ratio of Li and Fe，the amount of glucose added，the sintering temperature and sintering time. The structure of the prepared materials was analyzed by using TG/DSC，XRD and SEM，and their electrochemical performance was evaluated. Results illustrated that the sintering temperature showed the largest influence. With 1.05∶1 ratio of Li and Fe and 1.5 g of glucose，the capacity of the product was the highest（135 mAh/g）. The best sintering temperature range was found as 600～650 ℃，and the best sintering time range was 10～15 h. This improved method avoided using ball milling machine and would be beneficial for industrialization.

朱令之，王晨旭，韩恩山，杨津. 碳包覆LiFePO4正极材料的改进碳热固相法合成 [J]. 化工进展.

ZHU Lingzhi，WANG Chenxu，HAN Enshan，YANG Jin. Synthesizing of carbon wrapped LiFePO4 cathode material via improved solid state-carbothermal reations[J]. Chemical Industry and Engineering Progree.