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2018 Volume 27 Issue 3
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Shi-Gang Ling, Jia-Yue Peng, Qi Yang, Ji-Liang Qiu, Jia-Ze Lu, Hong Li. 2018: Enhanced ionic conductivity in LAGP/LATP composite electrolyte, Chinese Physics B, 27(3): 494-501. doi: 10.1088/1674-1056/27/3/038201
Citation: Shi-Gang Ling, Jia-Yue Peng, Qi Yang, Ji-Liang Qiu, Jia-Ze Lu, Hong Li. 2018: Enhanced ionic conductivity in LAGP/LATP composite electrolyte, Chinese Physics B, 27(3): 494-501. doi: 10.1088/1674-1056/27/3/038201
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Enhanced ionic conductivity in LAGP/LATP composite electrolyte

  • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China

  • Available Online: 01/01/2018
  • Fund Project: the National Key Research and Development Program of China(Grant 2016YFB0100100)%the National Natural Science Foundation of China(Grant .52315206 and 51502334)%Fund from Beijing Municipal Science & Technology Commission,China(Grant D171100005517001)
  • Nasicon materials (sodium superionic conductors) such as Li1.5Al0.5Ge1.5(PO4)3 (LAGP) and Li1.4Al0.4Ti1.6(PO4)3 (LATP) have been considered as important solid electrolytes due to their high ionic conductivity and chemical stability.Compared to LAGP,LATP has higher bulk conductivity around 10-3 S/cm at room temperature;however,the apparent grain boundary conductivity is almost two orders of magnitude lower than the bulk,while LAGP has similar bulk and grain boundary conductivity around the order of 10-4 S/cm.To make full use of the advantages of the two electrolytes,pure phase Li1.5Al0.5Ge1.5(PO4)3 and Li1.4Al0.4Ti1.6(PO4)3 were synthesized through solid state reaction,a series of composite electrolytes consisting of LAGP and LATP with different weight ratios were designed.XRD and variable temperature AC impedance spectra were carrried out to clarify the crystal structure and the ion transport properties of the composite electrolytes.The results indicate that the composite electrolyte with the LATP/LAGP weight ratio of 80:20 achieved the highest bulk conductivity which shall be due to the formation of solid solution phase Li1.42Al0.42Ge0.3Ti1.28(PO4)3,while the highest grain boundary conductivity appeared at the LATP/LAGP weight ratio of 20:80 which may be due to the excellent interfacial phase between Li1+xAlxGeyTi2-x-y(PO4)3/LATP.All the composite electrolytes demonstrated higher total conductivity than the pure LAGP and LATP,which highlights the importance of heterogeneous interface on regulating the ion transport properties.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Enhanced ionic conductivity in LAGP/LATP composite electrolyte

  • Available Online: 01/01/2018

Abstract: Nasicon materials (sodium superionic conductors) such as Li1.5Al0.5Ge1.5(PO4)3 (LAGP) and Li1.4Al0.4Ti1.6(PO4)3 (LATP) have been considered as important solid electrolytes due to their high ionic conductivity and chemical stability.Compared to LAGP,LATP has higher bulk conductivity around 10-3 S/cm at room temperature;however,the apparent grain boundary conductivity is almost two orders of magnitude lower than the bulk,while LAGP has similar bulk and grain boundary conductivity around the order of 10-4 S/cm.To make full use of the advantages of the two electrolytes,pure phase Li1.5Al0.5Ge1.5(PO4)3 and Li1.4Al0.4Ti1.6(PO4)3 were synthesized through solid state reaction,a series of composite electrolytes consisting of LAGP and LATP with different weight ratios were designed.XRD and variable temperature AC impedance spectra were carrried out to clarify the crystal structure and the ion transport properties of the composite electrolytes.The results indicate that the composite electrolyte with the LATP/LAGP weight ratio of 80:20 achieved the highest bulk conductivity which shall be due to the formation of solid solution phase Li1.42Al0.42Ge0.3Ti1.28(PO4)3,while the highest grain boundary conductivity appeared at the LATP/LAGP weight ratio of 20:80 which may be due to the excellent interfacial phase between Li1+xAlxGeyTi2-x-y(PO4)3/LATP.All the composite electrolytes demonstrated higher total conductivity than the pure LAGP and LATP,which highlights the importance of heterogeneous interface on regulating the ion transport properties.

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