Huen Priscilla, Peru Filippo, Charalambopoulou Georgia, Steriotis Theodore A, Jensen Torben R, Ravnsbæk Dorthe B
Center for Materials Crystallography, Interdisciplinary Nanoscience Center and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark.
National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi Attikis, Greece.
ACS Omega. 2017 May 10;2(5):1956-1967. doi: 10.1021/acsomega.7b00143. eCollection 2017 May 31.
In the past, sodium alanate, NaAlH, has been widely investigated for its capability to store hydrogen, and its potential for improving storage properties through nanoconfinement in carbon scaffolds has been extensively studied. NaAlH has recently been considered for Li-ion storage as a conversion-type anode in Li-ion batteries. Here, NaAlH nanoconfined in carbon scaffolds as an anode material for Li-ion batteries is reported for the first time. Nanoconfined NaAlH was prepared by melt infiltration into mesoporous carbon scaffolds. In the first cycle, the electrochemical reversibility of nanoconfined NaAlH was improved from around 30 to 70% compared to that of nonconfined NaAlH. Cyclic voltammetry revealed that nanoconfinement alters the conversion pathway, and operando powder X-ray diffraction showed that the conversion from NaAlH into NaAlH is favored over the formation of LiNaAlH. The electrochemical reactivity of the carbon scaffolds has also been investigated to study their contribution to the overall capacity of the electrodes.
过去，铝氢化钠（NaAlH）因其储氢能力而受到广泛研究，并且通过在碳支架中进行纳米限域来改善其储存性能的潜力也得到了深入研究。最近，NaAlH被考虑用作锂离子电池中转换型负极的锂离子存储材料。在此，首次报道了碳支架中纳米限域的NaAlH作为锂离子电池负极材料的情况。通过熔体渗透到介孔碳支架中来制备纳米限域的NaAlH。在第一个循环中，与非限域的NaAlH相比，纳米限域的NaAlH的电化学可逆性从约30%提高到了70%。循环伏安法表明纳米限域改变了转换途径，原位粉末X射线衍射表明从NaAlH转化为NaAlH比形成LiNaAlH更有利。还研究了碳支架的电化学反应性，以研究它们对电极整体容量的贡献。
