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Electrical Properties of NASICON-type Structured Li1.3Al0.3Ti1.7(PO4)3 Solid Electrolyte Prepared by 1,2-Propylene glycol-assisted Sol-gel Method
Lin-chao Zhang,Peng Chen,Zhang Hu,Chun-hua Chen*
Author NameAffiliationE-mail
Lin-chao Zhang CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China  
Peng Chen CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China  
Zhang Hu CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China  
Chun-hua Chen* CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China cchchen@ustc.edu.cn 
Abstract:
Lithium-ion conductor Li1.3Al0.3Ti1.7(PO4)3 with an ultrapure NASICON-type phase is syn-thesized by a 1,2-propylene glycol (1,2-PG)-assisted sol-gel method and characterized by differential thermal analysis-thermo gravimetric analysis, X-ray diffraction, scanning elec-tron microscopy, electrochemical impedance spectroscopy, and chronoamperometry test.Due to the use of 1,2-PG, a homogeneous and light yellow transparent precursor solu-tion is obtained without the precipitation of Ti4+ and Al3+ with PO43-. Well crystallized Li1.3Al0.3Ti1.7(PO4)3 can be prepared at much lower temperatures from 850 oC to 950 oC within a shorter synthesis time compared with that prepared at a temperature above 1000 oC by a conventional solid-state reaction method. The lithium ionic conductivity of the sintered pellets is up to 0.3 mS/cm at 50 oC with an activation energy as low as 36.6 kJ/mol for the specimen pre-sintered at 700 oC and sintered at 850 oC. The high conductivity, good chemi-cal stability and easy fabrication of the Li1.3Al0.3Ti1.7(PO4)3 provide a promising candidate as solid electrolyte for all-solid-state Li-ion rechargeable batteries.
Key words:  Lithium aluminum titanium phosphate, Lithium-ion conductor, NASICON electrolyte, Impedance spectroscopy
FundProject:
1,2-丙二醇辅助溶胶凝胶法制备NASICON型Li1.3Al0.3Ti1.7(PO4)3固体电解质
张临超,陈鹏,胡章,陈春华*
摘要:
通过1,2-丙二醇辅助的溶胶凝胶方法制备了具有NASICON结构的固体锂离子导体Li1.3Al0.3Ti1.7(PO4)3,并且通过热重/差热分析、X射线衍射分析、比表面观测、电化学阻抗谱以及计时电流法等对其各方面性能进行了表征. 通过使用1,2-丙二醇辅助方法,未额外添加络合剂,也未对pH值进行调整得到均匀的溶胶前驱体,并且通过在850~950oC不同高温段烧结得到无杂相的具有NASICON结构
关键词:  磷酸钛铝锂,锂离子导体,NASICON,电解质,阻抗谱
DOI:10.1088/1674-0068/25/06/703-707
分类号: