首页|NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries
NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries
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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 NbN quantum dots anchored on nitrogen-doped hollow carbon nanorods(NbN@NHCR)are elaborately developed as efficient LiPSs 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 LiPSs 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‖NbN@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 5.2 μL 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.
Dual-functional hostNbN quantum dotsShuttle effectDendrite-free Li anodeLi-S full batteries
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
College of Mechanical and Electronic Engineering,Northwest A&F University,Xianyang 712100,Shaanxi,China
College of Science and Institute of Oxygen Supply,Center of Tibetan Studies(Everest Research Institute),Tibet University,Lhasa 850000,Tibet,China
open research fund of Songshan Lake Materials LaboratoryNational Natural Science Foundation of ChinaSichuan Science and Technology programSichuan Science and Technology programReformation and Development Funds for Local Region Universities from China Government in 2020
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