A complex hydride lithium superionic conductor for high-energy-density all-solid-state lithium metal batteries
A complex hydride lithium superionic conductor for high-energy-density all-solid-state lithium metal batteries
复制标题
DOI：
10.1038/s41467-019-09061-9
复制
发表时间：
2019-03-06
影响因子：
16.6
通讯作者：
Orimo, Shin-ichi
中科院分区：
文献类型：
--
作者：
Kim, Sangryun;Oguchi, Hiroyuki;Orimo, Shin-ichi
包含锂金属阳极的全固态电池具有解决使用易燃有机液体电解质和低容量碳质阳极的常规锂离子电池的能量密度问题的潜力。然而，它们具有高的锂离子转移阻力，主要是由于固体电解质对锂金属的不稳定性，限制了它们在实际电池中的使用。本文报道了一种复合氢化物锂超离子导体0.7Li（CB_9 H_（10））-0.3Li（CB_（11）H_（12）），它对锂金属具有优异的稳定性，在25 ℃时的电导率为6.7 × 10 ~（-3）S·cm ~（-1）。这种复合氢化物表现出稳定的锂镀/剥离反应，在0.2 mA cm（-2）下具有可忽略的界面电阻（< 1 Ω cm（2）），使得全固态锂硫电池在5016 mA g（-1）的高电流密度下具有高能量密度（>2500 Wh kg（-1））。本研究开辟了固体电解质材料领域的一个未开发的研究领域，有助于高能量密度电池的发展。
All-solid-state batteries incorporating lithium metal anode have the potential to address the energy density issues of conventional lithium-ion batteries that use flammable organic liquid electrolytes and low-capacity carbonaceous anodes. However, they suffer from high lithium ion transfer resistance, mainly due to the instability of the solid electrolytes against lithium metal, limiting their use in practical cells. Here, we report a complex hydride lithium superionic conductor, 0.7Li(CB9H10)-0.3Li(CB11H12), with excellent stability against lithium metal and a high conductivity of 6.7 x 10(-3) S cm(-1) at 25 degrees C. This complex hydride exhibits stable lithium plating/stripping reaction with negligible interfacial resistance (< 1 Omega cm(2)) at 0.2 mA cm(-2), enabling all-solid-state lithium-sulfur batteries with high energy density (>2500 Wh kg(-1)) at a high current density of 5016 mA g(-1). The present study opens up an unexplored research area in the field of solid electrolyte materials, contributing to the development of high-energy-density batteries.