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DOI码：10.1021/acsaem.1c00193

发表刊物：ACS Appl. Energy Mater.

关键字：garnet electrolyte;interfacial resistance;SnS2;Li dendrites;solid-state battery

摘要：Garnet-based solid electrolytes are highly attractive because of their excellent ionic conductivity and electrochemical stability toward Li metal anodes. However, poor interfacial contact between the garnet electrolyte and electrode leads to a high interfacial impedance, and the resulting inhomogeneous interfacial current distribution expedites the growth of Li dendrites. Here, we propose a practical method to assemble dendrite-free solid-state batteries by coating SnS2 onto Li6.5La3Zr1.5Ta0.5O12 (LLZTO) pellets. The SnS2 layer promotes wettability, homogenizes the space electric field at the interface by an in situ conversion reaction, and can also be used as an excellent electrode. Using this method, we decreased the garnet/Li interfacial impedance to an ultralow extent of ∼17 Ω/cm2, while increasing the critical current density to 1.2 mA/cm2. The Li/LLZTO@SnS2/SnS2 solid-state battery delivers a low interfacial impedance of ∼72 Ω/cm2, a high capacity of ∼717 mAh/g, and excellent cycling stability and rate performance. We believe that the understanding and manipulation strategy of the SnS2 coating layer will shed light on designing an excellent garnet/Li interface and assembling novel all-solid-state batteries.

合写作者：Guo-Xi Ren, Peng-Fei Yu,Shun Zheng,Zong-Wang Tian,Si-Yuan Du,Jun-Xiong Chen

第一作者：Deng Zhou

通讯作者：Nian Zhang,Xiaosong Liu,Hui Zhang

卷号：4

期号：3

页面范围：2873-2880

ISSN号：2574-0962

是否译文：否

发表时间：2021-03-10

发布期刊链接：https://pubs.acs.org/doi/10.1021/acsaem.1c00193