Di Lecce Daniele, Verrelli Roberta, Campanella Daniele, Marangon Vittorio, Hassoun Jusef
Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185, Rome, Italy.
Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara, 17, 44121, Ferrara, Italy.
ChemSusChem. 2017 Apr 10;10(7):1607-1615. doi: 10.1002/cssc.201601638. Epub 2017 Mar 1.
A ternary CuO-Fe O -mesocarbon microbeads (MCMB) conversion anode was characterized and combined with a high-voltage Li Ni Fe Mn O spinel cathode in a lithium-ion battery of relevant performance in terms of cycling stability and rate capability. The CuO-Fe O -MCMB composite was prepared by using high-energy milling, a low-cost pathway that leads to a crystalline structure and homogeneous submicrometrical morphology as revealed by XRD and electron microscopy. The anode reversibly exchanges lithium ions through the conversion reactions of CuO and Fe O and by insertion into the MCMB carbon. Electrochemical tests, including impedance spectroscopy, revealed a conductive electrode/electrolyte interface that enabled the anode to achieve a reversible capacity value higher than 500 mAh g when cycled at a current of 120 mA g . The remarkable stability of the CuO-Fe O -MCMB electrode and the suitable characteristics in terms of delivered capacity and voltage-profile retention allowed its use in an efficient full lithium-ion cell with a high-voltage Li Ni Fe Mn O cathode. The cell had a working voltage of 3.6 V and delivered a capacity of 110 mAh g with a Coulombic efficiency above 99 % after 100 cycles at 148 mA g . This relevant performances, rarely achieved by lithium-ion systems that use the conversion reaction, are the result of an excellent cell balance in terms of negative-to-positive ratio, favored by the anode composition and electrochemical features.
对三元CuO-Fe₂O₃-中间相炭微球（MCMB）转换阳极进行了表征，并将其与高压LiNi₀.₅Fe₀.₅Mn₂O₄尖晶石阴极组合在一个锂离子电池中，该电池在循环稳定性和倍率性能方面具有相关性能。通过高能球磨制备了CuO-Fe₂O₃-MCMB复合材料，这是一种低成本的方法，XRD和电子显微镜显示该方法可得到晶体结构和均匀的亚微米级形态。阳极通过CuO和Fe₂O₃的转换反应以及锂离子嵌入MCMB碳中可逆地交换锂离子。包括阻抗谱在内的电化学测试表明，导电的电极/电解质界面使阳极在120 mA g⁻¹电流下循环时能够实现高于500 mAh g⁻¹的可逆容量值。CuO-Fe₂O₃-MCMB电极的显著稳定性以及在放电容量和电压分布保持方面的合适特性，使其能够用于具有高压LiNi₀.₅Fe₀.₅Mn₂O₄阴极的高效全锂离子电池中。该电池工作电压为3.6 V，在148 mA g⁻¹下循环100次后，放电容量为110 mAh g⁻¹，库仑效率高于99%。这些锂离子系统很少通过使用转换反应实现的相关性能，是负极与正极比例方面出色的电池平衡的结果，这得益于阳极组成和电化学特性。
