A lithium superionic conductor
A lithium superionic conductor
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DOI：
10.1038/nmat3066
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发表时间：
2011-09-01
期刊：
影响因子：
41.2
通讯作者：
Mitsui, Akio
中科院分区：
文献类型：
--
作者：
Kamaya, Noriaki;Homma, Kenji;Mitsui, Akio
电池是现代社会的关键技术(1，2)。它们被用来为电动汽车和混合动力汽车提供动力，并在智能电网中储存风能和太阳能。目前，具有高能量和功率密度的电化学设备只能由带有有机液体电解液的电池供电。然而，这样的电池需要相对严格的安全预防措施，使得大型系统非常复杂和昂贵。目前，固体电解质的应用受到限制，因为它们只有在50-80℃时才能获得实用的电导率(10(-2)S厘米(-1))，比有机液体电解质(3-8)低一个数量级。在这里，我们报道了一种具有新的三维骨架结构的锂快离子导体Li(10)GEP(2)S(12)。它在室温下表现出极高的锂离子电导率，达到12ms cm(-1)。这代表了在固体电解液中实现的最高电导率，甚至超过了液体有机电解液。这种新型固态电池电解液在器件制造(易于成形、图案化和集成)、稳定性(非易失性)、安全性(非爆炸性)和优异的电化学性能(高电导率和宽电位窗口)方面具有许多优点(9-11)。
Batteries are a key technology in modern society(1,2). They are used to power electric and hybrid electric vehicles and to store wind and solar energy in smart grids. Electrochemical devices with high energy and power densities can currently be powered only by batteries with organic liquid electrolytes. However, such batteries require relatively stringent safety precautions, making large-scale systems very complicated and expensive. The application of solid electrolytes is currently limited because they attain practically useful conductivities (10(-2) S cm(-1)) only at 50-80 degrees C, which is one order of magnitude lower than those of organic liquid electrolytes(3-8). Here, we report a lithium superionic conductor, Li(10)GeP(2)S(12) that has a new three-dimensional framework structure. It exhibits an extremely high lithium ionic conductivity of 12 mS cm(-1) at room temperature. This represents the highest conductivity achieved in a solid electrolyte, exceeding even those of liquid organic electrolytes. This new solid-state battery electrolyte has many advantages in terms of device fabrication (facile shaping, patterning and integration), stability (non-volatile), safety (non-explosive) and excellent electrochemical properties (high conductivity and wide potential window)(9-11).