Anti-pulverization intermetallic Fe–Sn anchored on N-doped carbon anode boosted superior power and stable lithium storage
2022; Elsevier BV; Volume: 553; Linguagem: Inglês
10.1016/j.jpowsour.2022.232272
ISSN1873-2755
AutoresMing Chen, Ke Yang, Boxu Dong, Qinnan Zhou, Yuchi Zhang, Yuedan Zhu, Asma Iqbal, Xuejiao Liu, Changyu Yan, CheeTongJohn Low, Xuefeng Qian,
Tópico(s)Supercapacitor Materials and Fabrication
ResumoTin (Sn) anode suffers from considerable volume deformation, generating vast dilatation-induced stresses leading to pulverization for lithium-ion batteries (LIBs). Herein, the Sn–Fe–C composite anode material with a jujube cake-like structure where Sn/FeSn 2 metalcore anchored on an N-doped carbon matrix is constructed. During the lithiation process, the intermetallic Fe–Sn (FeSn 2 ) generates Fe nanoparticles, which are uniformly distributed in the Sn matrix to relieve internal stress and create a conductive network, thus enhancing electron conduction and ion diffusion kinetics. In addition, the N-doped carbon matrix maintains the material structural integrity and improves overall conductivity. Consequently, the Sn–Fe–C anode delivers a high reversible 400 mAh g −1 over 1100 cycles at 5 A g −1 (capacity retention of up to 90.9%) and rate performance (237 mAh g −1 at 20 A g −1 ). Sn–Fe–C anode pairs with porous carbon (PC) cathode to assemble lithium-ion capacitors (Sn–Fe–C || PC LICs), which show a maximum energy density of 203.8 Wh kg −1 , an excellent power density of 23925.3 W kg −1 , and energy retention rate of 72.9% after 18,000 cycles at 1 A g −1 . The Sn–Fe–C material as an anti-pulverization anode could be a potential application for high-performance LIBs and LICs in the future. • Fe–Sn anchors on N-doped carbon matrix to construct jujube cake-like structure. • Intermetallic Fe–Sn provides anti-pulverization and fast Li + diffusion kinetics. • Sn–Fe–C anode exhibits capacity retention of 90.9% at 5 A g −1 after 1100 cycles.
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