NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries  

作　　者：Fei Ma Zhuo Chen Katam Srinivas Ziheng Zhang Yu Wu Dawei Liu Hesheng Yu Yue Wang Xinsheng Li Ming-qiang Zhu Qi Wu Yuanfu Chen 

机构地区：[1]School of Integrated Circuit Science and Engineering,and State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology,Chengdu 610054,Sichuan,China [2]College of Science and Institute of Oxygen Supply,Center of Tibetan Studies(Everest Research Institute),Tibet University,Lhasa 850000,Tibet,China [3]College of Mechanical and Electronic Engineering,Northwest A&F University,Xianyang 712100,Shaanxi,China

出　　处：《Journal of Energy Chemistry》2024年第1期260-271,I0007,共13页能源化学（英文版）

基　　金：supported by the open research fund of Songshan Lake Materials Laboratory (2022SLABFN26);the National Natural Science Foundation of China (21773024);the Sichuan Science and Technology program (2020YJ0324,2020YJ0262);the Reformation and Development Funds for Local Region Universities from China Government in 2020 (ZCKJ 2020-11)。

摘　　要：The shuttle effect of lithium polysulfides(LiPSs)and uncontrollable lithium dendrite growth seriously hinder the practical application of lithium-sulfur(Li-S)batteries.To simultaneously address such issues,monodispersed Nb N quantum dots anchored on nitrogen-doped hollow carbon nanorods(NbN@NHCR)are elaborately developed as efficient Li PSs immobilizer and Li stabilizer for high-performance Li-S full batteries.Density functional theory(DFT)calculations and experimental characterizations demonstrate that the sulfiphilic and lithiophilic NbN@NHCR hybrid can not only efficiently immobilize the soluble Li PSs and facilitate diffusion-conversion kinetics for alleviating the shuttling effect,but also homogenize the distribution of Li+ions and regulate uniform Li deposition for suppressing Li-dendrite growth.As a result,the assembled Li-S full batteries(NbN@NHCR-S||Nb N@NHCR-Li)deliver excellent long-term cycling stability with a low decay rate of 0.031%per cycle over 1000 cycles at high rate of 2 C.Even at a high S loading of 5.8 mg cm^(-2)and a low electrolyte/sulfur ratio of 5.2μL mg^(-1),a large areal capacity of 6.2 mA h cm^(-2)can be achieved in Li-S pouch cell at 0.1 C.This study provides a new perspective via designing a dual-functional sulfiphilic and lithiophilic hybrid to address serious issues of the shuttle effect of S cathode and dendrite growth of Li anode.

关 键 词：Dual-functional host NbN quantum dots Shuttle effect Dendrite-free Li anode Li-S full batteries 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]