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

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Journal of Energy Chemistry 2024年第1期88卷 260-271,I0007页

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 school of Integrated Circuit science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and TechnologyChengdu 610054SichuanChina College of science and Institute of Oxygen supply Center of Tibetan Studies(Everest Research Institute)Tibet UniversityLhasa 850000TibetChina College of Mechanical and Electronic Engineering Northwest A&F UniversityXianyang 712100ShaanxiChina

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

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Dual-Functional lithiophilic/sulfiphilic Binary-Metal selenide Quantum Dots Toward High-Performance li-s full batteries

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Nano-Micro Letters 2023年第5期15卷 169-186页

作者： Youzhang Huang liang lin Yinggan Zhang lie liu Baisheng sa Jie lin Laisen Wang Dong-liang Peng Qingshui Xie state Key Lab for Physical Chemistry of solid surfaces Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamen 361005People’s Republic of China shenzhen Research Institute of Xiamen University Shenzhen 518000People’s Republic of China College of Materials science and Engineering Multiscale Computational Materials FacilityFuzhou UniversityFuzhou 350100People’s Republic of China

The commercial viability of lithium-sulfur batteries is still challenged by the notorious lithium polysulfides(li Pss)shuttle effect on the sulfur cathode and uncontrollable li dendrites growth on the li anode.Herein,a bi-service host with Co-Fe binary-metal selenide quantum dots embedded in three-dimensional inverse opal structured nitrogen-doped carbon skeleton(3DIO FCse-QDs@NC)is elaborately designed for both sulfur cathode and li metal anode.The highly dispersed FCse-QDs with superb adsorptive-catalytic properties can effectively immobilize the soluble li Pss and improve diffusion-conversion kinetics to mitigate the polysulfide-shutting behaviors.simultaneously,the 3D-ordered porous networks integrated with abundant lithophilic sites can accomplish uniform li deposition and homogeneous li-ion flux for suppressing the growth of dendrites.Taking advantage of these merits,the assembled li-s full batteries with 3DIO FCse-QDs@NC host exhibit excellent rate performance and stable cycling ability(a low decay rate of 0.014%over 2,000 cycles at 2C).Remarkably,a promising areal capacity of 8.41 mAh cm^(-2)can be achieved at the sulfur loading up to 8.50 mg cm^(-2)with an ultra-low electrolyte/sulfur ratio of 4.1μL mg^(-1).This work paves the bi-serve host design from systematic experimental and theoretical analysis,which provides a viable avenue to solve the challenges of both sulfur and li electrodes for practical li-s full batteries.

关键词： Dual-functional host Fe_(2)Cose_(4)quantum dots shuttle effect Dendrite-free li anode li-s full batteries

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