Enhanced ionic conductivity in LAGP/LATP composite electrolyte

doi:10.1088/1674-1056/27/3/038201

Abstract Nasicon materials (sodium superionic conductors) such as Li_1.5Al_0.5Ge_1.5(PO₄)₃ (LAGP) and Li_1.4Al_0.4Ti_1.6(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 Li_1.5Al_0.5Ge_1.5(PO₄)₃ and Li_1.4Al_0.4Ti_1.6(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 carried 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 Li_1.42Al_0.42Ge_0.3Ti_1.28(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 Li_1+xAl_xGe_yTi_2-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.

Keywords: solid electrolyte composite heterogeneous interface enhanced conductivity

Received: 10 October 2017
Revised: 29 December 2017
Accepted manuscript online:

PACS:	82.47.Aa	(Lithium-ion batteries)
	66.30.-h	(Diffusion in solids)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFB0100100), the National Natural Science Foundation of China (Grant Nos. 52315206 and 51502334), Fund from Beijing Municipal Science & Technology Commission, China (Grant No. D171100005517001).

Corresponding Authors: Hong Li
E-mail: hli@iphy.ac.cn

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Shi-Gang Ling(凌仕刚), Jia-Yue Peng(彭佳悦), Qi Yang(杨琪), Ji-Liang Qiu(邱纪亮), Jia-Ze Lu(卢嘉泽), Hong Li(李泓) Enhanced ionic conductivity in LAGP/LATP composite electrolyte 2018 Chin. Phys. B 27 038201

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Enhanced ionic conductivity in LAGP/LATP composite electrolyte

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