文献类型：期刊文献

英文题名：Dynamic Intercalation-Conversion Site Supported Ultrathin 2D Mesoporous SnO2/SnSe2 Hybrid as Bifunctional Polysulfide Immobilizer and Lithium Regulator for Lithium-Sulfur Chemistry

作者：Yao, Weiqi[1];Xu, Jie[2];Cao, Yongjie[3];Meng, Yufeng[4];Wu, Ziling[1];Zhan, Liang[1];Wang, Yanli[1];Zhang, Yelong[5];Manke, Ingo[6];Chen, Nan[7];Yang, Chao[6];Chen, Renjie[7]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Peoples R China;[3]Fudan Univ, Inst New Energy, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China;[4]Shanghai Inst Space Power Sources, Shanghai 200245, Peoples R China;[5]Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;[6]Helmholtz Ctr Berlin Mat & Energy, D-14109 Berlin, Germany;[7]Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China

年份：2022

卷号：16

期号：7

起止页码：10783

外文期刊名：ACS NANO

收录：;EI(收录号：20223112524114);WOS:【SCI-EXPANDED(收录号:WOS:000821924600001)】；

语种：英文

外文关键词：SnO2/SnSe2 hybrid; mesoporous; dynamic; intercalation-conversion; Li-S battery

摘要：The practical application of lithium-sulfur batteries is impeded by the polysulfide shuttling and interfacial instability of the metallic lithium anode. In this work, a twinborn ultrathin two-dimensional graphene-based mesoporous SnO2/SnSe2 hybrid (denoted as G-mSnO(2)/SnSe2) is constructed as a polysulfide immobilizer and lithium regulator for Li-S chemistry. The as-designed G-mSnO(2)/SnSe2 hybrid possesses high conductivity, strong chemical affinity (SnO2), and a dynamic intercalation-conversion site (LixSnSe2), inhibits shuttle behavior, provides rapid Li-intercalative transport kinetics, accelerates LiPS conversion, and decreases the decomposition energy barrier for Li2S, which is evidenced by the ex situ XAS spectra, in situ Raman, in situ XRD, and DFT calculations. Moreover, the mesoporous G-mSnO(2)/SnSe2 with lithiophilic characteristics enables homogeneous Li-ion deposition and inhibits Li dendrite growth. Therefore, Li-S batteries with a G-mSnO(2)/SnSe2 separator achieve a favorable electrochemical performance, including high sulfur utilization (1544 mAh g(-1) at 0.2 C), high-rate capability (794 mAh g(-1) at 8 C), and long cycle life (extremely low attenuation rate of 0.0144% each cycle at 5 C over 2000 cycles). Encouragingly, a 1.6 g S/Ah-level pouch cell realizes a high energy density of up to 359 Wh kg(-1) under a lean E/S usage of 3.0 mu L mg(-1). This work sheds light on the design roadmap for tackling S-cathode and Li-anode challenges simultaneously toward long-durability Li-S chemistry.