Portal de Periódicos da CAPES

Anomalous High Ionic Conductivity of Nanoporous β-Li 3 PS 4

2013; American Chemical Society; Volume: 135; Issue: 3 Linguagem: Inglês

10.1021/ja3110895

1943-2984

Zengcai Liu, Wujun Fu, E. Andrew Payzant, Xiang Yu, Zili Wu, Nancy J. Dudney, Jim Kiggans, Kunlun Hong, Adam J. Rondinone, Chengdu Liang,

Chemical Synthesis and Characterization

Lithium-ion-conducting solid electrolytes hold promise for enabling high-energy battery chemistries and circumventing safety issues of conventional lithium batteries. Achieving the combination of high ionic conductivity and a broad electrochemical window in solid electrolytes is a grand challenge for the synthesis of battery materials. Herein we show an enhancement of the room-temperature lithium-ion conductivity by 3 orders of magnitude through the creation of nanostructured Li(3)PS(4). This material has a wide electrochemical window (5 V) and superior chemical stability against lithium metal. The nanoporous structure of Li(3)PS(4) reconciles two vital effects that enhance the ionic conductivity: (1) the reduction of the dimensions to a nanometer-sized framework stabilizes the high-conduction β phase that occurs at elevated temperatures, and (2) the high surface-to-bulk ratio of nanoporous β-Li(3)PS(4) promotes surface conduction. Manipulating the ionic conductivity of solid electrolytes has far-reaching implications for materials design and synthesis in a broad range of applications, including batteries, fuel cells, sensors, photovoltaic systems, and so forth.