Anomalous High Ionic Conductivity of Nanoporous β-Li3PS4
Anomalous High Ionic Conductivity of Nanoporous β-Li3PS4
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DOI：
10.1021/ja3110895
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发表时间：
2013-01-23
影响因子：
15
通讯作者：
Liang, Chengdu
中科院分区：
文献类型：
--
作者：
Liu, Zengcai;Fu, Wujun;Liang, Chengdu
锂离子导电固体电解质有望实现高能量电池的化学性质，并规避传统锂电池的安全问题。在固体电解质中实现高离子电导率和宽电化学窗口的结合是电池材料合成的巨大挑战。在这里，我们展示了通过创建纳米结构的Li3PS4，室温锂离子电导率提高了3个数量级。该材料具有宽的电化学窗口（5 V）和优越的抗锂金属化学稳定性。Li3PS4的纳米多孔结构调和了增强离子电导率的两个重要作用：(1)尺寸减小到纳米尺寸的框架稳定了高温下发生的高传导β相；(2)纳米多孔β -Li3PS4的高表面体积比促进了表面传导。操纵固体电解质的离子电导率对材料的设计和合成有着深远的影响，在广泛的应用中，包括电池、燃料电池、传感器、光伏系统等。
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 Li3PS4. This material has a wide electrochemical window (5 V) and superior chemical stability against lithium metal. The nanoporous structure of Li3PS4 reconciles two vital effects that enhance the ionic conductivity: (1) the reduction of the dimensions to a nanometer-sized framework stabilizes the high-conduction beta phase that occurs at elevated temperatures, and (2) the high surface-to-bulk ratio of nanoporous beta-Li3PS4 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.