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
	2012
发表期刊	Physical Chemistry Chemical Physics
ISSN	1463-9076
卷号	14 期号:8 页码:2669-2677
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.
部门归属	[qin, xue; wang, jiemin; xie, jie; li, fangzhi; wen, lei; wang, xiaohui] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [qin, xue; xie, jie] chinese acad sci, grad sch, beijing 100039, peoples r china.;wang, xh (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;wang@imr.ac.cn
关键词	Lithium-ion Batteries Electrode Materials Particle-size Nanocrystals Morphology Mechanism Behavior Cathode Polymerization Nanoparticles
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60194
专题	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.