A porous framework infiltrating Li-O-2 battery: a low-resistance and high-safety system
A porous framework infiltrating Li-O-2 battery: a low-resistance and high-safety system
复制标题
渗透锂氧电池的多孔框架：低电阻、高安全性系统
DOI：
10.1039/d0se00024h
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发表时间：
2020
影响因子：
5.6
通讯作者：
Zhang Tao
中科院分区：
文献类型：
--
作者：
Zhang Yi-Peng;Li Yi-Qiu;Cui Zhong-Hui;Wang Jia-Cheng;Yamamoto Osamu;Imanishi Nobuyuki;Zhang Tao
锂氧电池因其高能量密度而备受关注，但存在有机液体电解质易燃性、锂阳极腐蚀和氧化还原介质穿梭效应等问题。使用无机固态电解质（sse）可以解决这些问题。但是这些电池中sse -电极界面的高电阻阻碍了它们的进一步发展。本研究提出了“多孔框架渗透（PFI）”的概念。该框架是通过酸蚀在石榴石Li6.4La3Zr1.4Ta0.6O12 （LLZTO）陶瓷表面上创建的。在渗透少量液体电解质后，该框架表现出不可燃性，因此是高安全性应用的理想选择。此外，多孔结构增加了SSE与阴极的接触面积，降低了界面电阻，提高了速率性能。采用Li-Sn合金阳极，PFI Li-O2电池具有不同充电速率的平滑充电平台、较长的循环寿命和良好的往返效率。因此，PFI结构为构建安全高性能的Li-O2电池提供了一种新的策略。
Li–O2 batteries, which have attracted great attention because of their high energy density, suffer from issues such as flammability of organic liquid electrolytes, corrosion of the Li anode and the shuttling effect of redox mediators. Using inorganic solid-state electrolytes (SSEs) can solve such issues. But high resistance at the SSE–electrode interfaces in these batteries hinders their further development. In this study, a “porous framework infiltrating (PFI)” concept is proposed. The framework is created on the surface of a garnet Li6.4La3Zr1.4Ta0.6O12 (LLZTO) ceramic by acid etching. After infiltrating a tiny amount of liquid electrolyte, this framework exhibits nonflammability and is thus ideal for high-safety applications. Moreover, the porous structure increases the contact area between the SSE and cathode, which can lower the interfacial resistance and improve the rate capability. Utilizing a Li–Sn alloy anode, the PFI Li–O2 battery exhibits smooth charging platforms with different rates, a prolonged cycle life and a promising round-trip efficiency. Therefore, the PFI structure provides a new strategy to build safe and high-performance Li–O2 batteries.