首页|(162855)Boost the cyclability and Na~+ diffusion kinetics of Sb_2S_3 anode by CNTs cross-linking N-doped carbon matrix
(162855)Boost the cyclability and Na~+ diffusion kinetics of Sb_2S_3 anode by CNTs cross-linking N-doped carbon matrix
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NSTL
Elsevier
Antimony sulfides exhibit a tremendous potential owing to the high theoretical specific capacity from multiple redox storage mechanisms for sodium-ion batteries (SIBs). However, these bottlenecks, including low electrical conductivity, poor ionic diffusion kinetics, and severe volume expansion, still restrict the development of antimony sulfide as SIBs anodes. Meanwhile, in view of long-term interests and practical application, the cost-efficient preparation methods become an imminent challenge to the advancement of high-performance SIBs anodes. Here, a novel three-step strategy, composed of co-precipitation, heat reduction processes, and sulfation conversion, was utilized to construct a "reinforced concrete" architecture, in which Sb_2S_3 nanoparticles embedded in N-doped carbon matrix (NC) modified by carbon nanotubes (CNTs), denoted as Sb_2S_3/CNTs/NC. As the "cement block", the N-doped 3D carbon matrix can promote the electron migration and reduce the aggregation of active materials upon cycling. In terms of "rebars" (i.e., 1D CNTs) for ensuring the anode integrality during incessant sodiation/de-sodiation processes, they function as binders and stabilizers, which intimately cross-link with Sb_2S_3 nanoparticles and carbon matrix, accommodate the volume change, and maintain the fast transfer of electron transfer inside the whole composite. Benefiting from these merits of the hierarchical structure (i.e., 3D NC and 1D CNTs), as an anode for SIBs, Sb_2S_3/CNTs/NC demonstrates an improved sodium storage capability with an initial specific capacity of 770.80 mAh g~(-1) at 0.1 A g~(-1) and a superior initial coulombic efficiency (ICE) of 79.90%. Moreover, even at a high current density of 1.0 A g~(-1) a reversible capacity of 313.54 mAh g~(-1) can be delivered after 350 long cycles, indicating the stable cyclicity. The Sb_2S_3/CNTs/NC with designed construction and enhanced electrochemical performance could provide a new perspective on low-cost, time-saving, and exercisable synthesis approach for high-performance sulfide-based anodes.
Sb_2S_3Sodium ion batteryN-doped carbon matrixCNTsAnode
Qimeng Peng、Ju Fu、Gang Chen
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College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province, College of Civil Aviation Safety Engineering, Civil Aviation Flight Universityof China, Guanghan 618307, China
State Key Laboratory of Polymer Materials Engineering Polymer Research Institute, Sichuan University, Chengdu 610065, China
NSTL
Elsevier
