室温下Li-Fe（II）-P-H2O体系共沉淀制备LiFePO4的热力学分析（英文）

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 22; no. 7; pp. 1766 - 1770
Main Author 何利华 赵中伟 刘旭恒 陈爱良 司秀芬
Format Journal Article
LanguageEnglish
Published 2012
Subjects
磷酸铁锂锂离子电池Li-Fe（II）-P-H2O系热力学共沉淀
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Bibliography:Thermodynamics of the precipitation from Li-Fe（II）-P-H2O system at 298 K was investigated.The results demonstrate that LiFePO4 can be formed at room temperature under pH value of 0-11.3,and the impurities Li3PO4 and Fe（OH）2 will be yielded at pH value above 11.3 and 12.9,respectively.The optimum pH value for LiFePO4 precipitation is 8-10.5.Considering the low rate of phase transformation kinetics,metastable Li-Fe（II）-P-H2O system was also studied.The results indicate that equimolar ratio of co-precipitation precursor Fe3（PO4）2.8H2O and Li3PO4 cannot be obtained at the initial molar ratio 1：1：1 and 1：1：3 of Li：Fe：P.In contrast,equimolar ratio of the co-precipitation precursor can be yielded by adjusting the pH value to 7-9.2,matching the molar ratio 3：1：1 of Li：Fe：P,meaning that Li＋-excess is one of the essential conditions for LiFePO4 preparation by co-precipitation method.
HE Li-hua,ZHAO Zhong-wei,LIU X u-heng,CHEN Ai-liang,SI Xiu-fen School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China
43-1239/TG
lithium iron phosphate;lithium ion batteries;Li-Fe（Ⅱ）-P-H2O system;thermodynamics;co-precipitation
ISSN:1003-6326