Hydrothermally synthesized LiFePO4 crystals with enhanced electrochemical properties: simultaneous suppression of crystal growth along 010 and antisite defect formation

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	Hydrothermally synthesized LiFePO4 crystals with enhanced electrochemical properties: simultaneous suppression of crystal growth along 010 and antisite defect formation
	X. Qin ; J. M. Wang ; J. Xie ; F. Z. Li ; L. Wen ; X. H. Wang
刊名	Physical Chemistry Chemical Physics
	2012
卷号	14 期号:8 页码:2669-2677
关键词	lithium-ion batteries electrode materials particle-size nanocrystals morphology mechanism behavior cathode polymerization nanoparticles
ISSN号	1463-9076
中文摘要	Improving electrochemical properties of hydrothermally synthesized LiFePO4 powders is of immense technological significance and has been a subject of much scientific inquiry for many years. As reported previously, reversing the feeding sequence of starting materials and/or introducing ethylene glycol (EG) could significantly improve the electrochemical performance of hydrothermally synthesized LiFePO4. However, the mechanism remains unclear. Here, we report a systematic study to understand the mechanism from viewpoints of crystal growth and defect concentration control. Combining the results of experimental and theoretical investigations, the improvement in electrochemical performance is attributed to simultaneous suppression of crystal growth along the [010] direction and reduced defect concentration of the Fe(Li)(center dot)antisite. The reduction in antisite defects is readily monitored by significant red shift of the infrared (IR) absorption band around 1000 cm(-1) which is assigned to the symmetric stretching P-O vibration of the PO4 tetrahedron, as indicated by theoretical calculation. With this knowledge in mind, an output as high as 450 g L-1 (autoclave volume), and an enhanced specific discharge capacity of 165 A h kg(-1) (close to the theoretical unity of 170 A h kg(-1)) at 0.1 C are achieved.
原文出处	://WOS:000299742000015
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/60194]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Qin,J. M. Wang,J. Xie,et al. Hydrothermally synthesized LiFePO4 crystals with enhanced electrochemical properties: simultaneous suppression of crystal growth along 010 and antisite defect formation[J]. Physical Chemistry Chemical Physics,2012,14(8):2669-2677.
APA	X. Qin,J. M. Wang,J. Xie,F. Z. Li,L. Wen,&X. H. Wang.(2012).Hydrothermally synthesized LiFePO4 crystals with enhanced electrochemical properties: simultaneous suppression of crystal growth along 010 and antisite defect formation.Physical Chemistry Chemical Physics,14(8),2669-2677.
MLA	X. Qin,et al."Hydrothermally synthesized LiFePO4 crystals with enhanced electrochemical properties: simultaneous suppression of crystal growth along 010 and antisite defect formation".Physical Chemistry Chemical Physics 14.8(2012):2669-2677.