Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第5期    总第110期    2008年5月

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文章编号:1004-0609(2008)05-0867-06
制备过程pH值对FePO4∙xH2O及LiFePO4性能的影响
郑俊超,李新海,王志兴,郭华军,王丹琴

(中南大学 冶金科学与工程学院,长沙 410083)

摘 要: FeSO4·7H2OH3PO4H2O2NH3·H2O为原料合成FePO4·xH2O前驱体,考察制备过程溶液pH值对合成FePO4·xH2O前驱体性能的影响;将Li2CO3FePO4·xH2O和乙炔黑球磨混合,通过低温固相反应合成LiFePO4。用X射线衍射和扫描电镜对FePO4·xH2OLiFePO4进行结构和表面形貌表征,研究不同pH值条件下合成的FePO4·xH2O前驱体为原料对制备的LiFePO4电化学性能的影响。结果表明:溶液pH1.5时制备的FePO4·xH2O中含有少量Fe(PO4)2(OH)2杂质,当pH分别为2345时,合成的FePO4·xH2O均为纯相。pH值为2左右合成的FePO4·xH2O前驱体制备出的LiFePO4具有良好的电化学性能;其振实密度达1.11 g/cm3

 

关键字: 锂离子电池;LiFePO4;PO4•xH2O;电化学性能

Effect of pH value on performance of FePO4∙xH2O and LiFePO4 in synthesis process
ZHENG Jun-chao, LI Xin-hai, WANG Zhi-xing, GUO Hua-jun, WANG Dan-qin

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:FePO4•xH2O precursor was synthesized from FeSO4•7H2O, H3PO4, H2O2 and NH3•H2O under various pH value. LiFePO4 cathode material was then synthesized by low temperature sintering of the homogeneous mixture of Li2CO3,acetylene black and FePO4•xH2O. The effect of the solution pH on the performance of FePO4•xH2O was characterized. The structures of FePO4•xH2O and LiFePO4 were characterized by XRD and SEM. The effect of the solution pH on the electrochemical performance of LiFePO4 was discussed. The results show that no impurities exist in the FePO4•xH2O synthesized at pH value ranging in 2 and 5. LiFePO4 made from FePO4•xH2O precursor synthesized under the condition that the solution pH is about 2 show excellent electrochemical performance, and the tap density reaches 1.11 g/cm3.

 

Key words: lithium ion batteries; LiFePO4; FePO4•xH2O; electrochemical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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