Neutron scattering studies of glassy solid-state lithium ion based electrolytes
We present neutron diffraction results on superionic materials that are good candidates for use as solid-state electrolytes in next generation Li + ion batteries. Lithium ion conducting glasses of the compositions xLi2SO4-(1-x) [0.5Li2O-0.5(2NH 4H2PO2)]; x=0 and 0.1 were synthesized by conventional melt-quenching. The transparent homogeneous glassy flakes were thus obtained and used for the characterization. The materials are glassy in nature and composed of a complex network of the following sub-units: Li2O, Li2SO4, and 2NH4H2PO2. This disordered structure is integral to its function in that it promotes Li+ ion conduction while suppressing electronic conduction, the necessary qualities of a good Li+ electrolyte. We used neutron diffraction to study the formation of crystallites upon heating of the material above 400°C. The crystallite formation is understood to be detrimental to the Li+ ion mobility and, hence, is identified with a diminished performance in devices that require heating in their fabrication process. Here, we report the changes in the material, as observed by neutron diffraction, as a function of annealing temperature and temperature history.
Physics, Astronomy, and Materials Science
Heitmann, Tom, Syed Ali S. Zaidi, Leo Zella, Munesh Rathore, Anshuman Dalvi, and Saibal Mitra. "Neutron Scattering Studies of Glassy Solid-State Lithium Ion Based Electrolytes." MRS Online Proceedings Library 1540, no. 1 (2013): 3501-3505.
Materials Research Society Symposium Proceedings