摘要
以PEG为纳米结构调控剂和碳源,Fe(NO3)3·9 H2O为铁源,LiH2PO4为锂源,采用液相法制备了LiFePO4/C复合物,并通过恒电流充放电、交流阻抗和扫描电子显微镜法(SEM)测试方法,对复合物的低温电化学性能做了研究。研究表明:随PEG用量的增加,产物粒径依次减小,而锂离子的扩散速率随之增大,LiFePO4/C复合材料的低温性能进而得以显著改善与提高;当n(PEG)∶n(LFP)=2.00∶1.00时,-20℃下0.1 C首次放电比容量为111.7 mAh/g,循环20次后容量衰减为1.8%。
LiFePO4/C were prepared by liquid-phase method using polyethylene glycol （PEG） as carbon source and nano structure control agent, LiH2PO4 as lithium source and Fe （NO3）3.9 H2O as iron source. The charge/discharge test, EIS and scanning electron microscope （SEM） texts show that increasing the dosage of PEG can obtain the products with small particles, high lithium diffusion coefficient, and can improve its low temperature performance obviously. When n（PEG） ： n（LFP）=2.00 ： 1.00, the specific capacity of the battery can reach 111.7 mAh/g at -20 ℃ of 0.1 C rate, and the capacity fading radio is 1.8% after 20 cycles.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第8期1329-1331,共3页
Chinese Journal of Power Sources
基金
上海市科学技术委员会"创新行动计划"(纳米专项0852nm02300)
