Coexistence of Sn and FeSn2 nanoparticles dispersed in glass-ceramics and their electrochemical performance as sodium-ion battery anode
Coexistence of Sn and FeSn2 nanoparticles dispersed in glass-ceramics and their electrochemical performance as sodium-ion battery anode
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Sn和FeSn2纳米粒子分散在玻璃陶瓷中的共存及其作为钠离子电池负极的电化学性能
DOI：
10.1016/j.jallcom.2023.169576
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发表时间：
2023
影响因子：
6.2
通讯作者：
Ito Shigeharu
中科院分区：
文献类型：
--
作者：
Sato Fumitaka;Honma Tsuyoshi;Komatsu Takayuki;Kaharudin Amalina Aina Binti;Homma Tomoyuki;Ito Shigeharu
为了探索β-Sn和FeSn 2纳米粒子共存的新型钠离子电池负极材料，采用机械化学球磨法制备了55 SnO-15 Na 2 O-yFe 2 O3-（30-y）SiO2（y = 0-9）玻璃态样品。X射线衍射分析和透射电镜观察表明，在10%H2/90%N2还原气氛中，450 °C热处理3-10 h，玻璃粉末中形成了β-Sn金属和FeSn 2金属间化合物，其尺寸约为100 nm。结果表明，FeSn 2的形成大大抑制了β-Sn的长大（粗化），使β-Sn、FeSn 2和Na_2 O-SiO_2基非晶相均匀地分散在微晶玻璃中。结果表明，新型微晶玻璃可作为SIB的负极材料，在y = 6.75的样品中，初始容量可达350 mAh/g，β-Sn/FeSn 2与Na+之间具有可逆合金化行为。Fe 2 O3的加入以及FeSn 2与β-Sn的共存有利于钠半电池的稳定工作。
New glassy samples with 55SnO-15Na2O-yFe2O3-(30–y)SiO2compositions (y = 0–9) were synthesized by the mechanochemical milling method to explore new sodium-ion battery (SIB) anodes with the coexistence of β-Sn and FeSn2nanoparticles. It was clarified from X-ray diffraction analysis and transmission electron microscopy observations that β-Sn metal and FeSn2intermetallic compound with the size of ∼100 nm were formed in the glass powders heat-treated at 450 °C for 3–10 h in 10%H2/90%N2reducing atmosphere. It was suggested that the growth (coarsening) of β-Sn is largely depressed due to the formation of FeSn2, and β-Sn, FeSn2, and the Na2O-SiO2-based amorphous phase are dispersed homogeneously in the glass-ceramics. It was clarified that new glass-ceramics are working as anode materials for SIBs, for example, showing the initial capacity of 350 mAh/g in the sample with y = 6.75 and the reversible alloying behavior between β-Sn/FeSn2and Na+ions. The addition of Fe2O3and the coexistence of FeSn2with β-Sn contribute to the stable operation of the sodium half-cell.