Abstract:
Although solid-state electrolytes are old stories, they have recently received intensive attention due to their stability within a wide potential voltage window. In addition to that, solid-state electrolytes are chemically stable in compared with their counterpart, the organic electrolytes. Owing to superior safety and long lives, all-solid-state batteries are regarded as the most advanced materials of the devices for next-generation power storage. One of the crucial components in the all-solid-state battery is solid-state electrolyte materials that require high lithium ion conductivity and good chemical stability against lithium metal and cathode materials have been received great attention in order to fulfil application demand.[1]
One of the potential solid-state electrolytes is the NASICON-structured system including LiTi2(PO4)3, LiZr2(PO4)3 and LiGe2(PO4)3 system. We have studied lithium analogues based on sodium superionic conductor structure, one of the most potential material as a solid electrolyte. Dopants with lower valence such as Al, Ga, In, Ti, Sc, Y, La, Cr are also adopted to substitute A4+ site and therefore enhance the material’s ionic conductivity.[2, 3] However, the application of NASICON material is still restricted by relatively low total ionic conductivity.
To explore a possible solution, we have investigated the synthesis process of lithium aluminum phosphate (LAGP) in this study. Different synthesis methods are used to decrease the porosity of the material as well as increase the uniformity of composition. Detailed parameters were studied to understand their influence on phase transformation progress and to obtain the optimal processing procedure. Systematic characterizations on crystal structure and morphology are conducted for further analysis.
Acknowledgement
This research is supported by National University of Singapore, and the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Programme (CRP Award No. NRF-CRP10-2012-06) and by National Science Foundation of China (NSFC 51572182).
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