Yao Ye, Zhang Lu, Bie Xiaofei, Chen Hong, Wang Chunzhong, Du Fei, Chen Gang
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, P. R. China.
College of Physics, Beihua University, Jilin, 132013, P. R. China.
Chemistry. 2017 Dec 19;23(71):17935-17939. doi: 10.1002/chem.201702075. Epub 2017 Dec 4.
Mg-Li hybrid batteries have attracted wide interest in recent years because of their potential safety as well as their cost benefit and high volumetric capacity. However, slow kinetic properties strongly hinder their commercial application. In this study, we have prepared spinel LiCrTiO by a solid-state reaction and have conducted a comprehensive study aimed at improving the performance of Mg-Li hybrid batteries by optimizing the dual-salt electrolyte. LiCrTiO has been found to show reversible discharge/charge capacities of 178 and 169 mA h g in electrolytes of 1 m LiCl and 0.3 m APC (all-phenyl-complex), respectively. When the concentration of APC was increased to 0.4 m, LiCrTiO showed a high capacity retention of 95 % after 30 cycles. In addition, no phase transition could be observed for an LiCrTiO electrode in a dual-salt system, suggesting high electrochemical reversibility. Ex situ EDX and SEM studies have indicated that only Li ions are inserted into the cathode side, while Mg ions are reversibly deposited on the surface of Mg metal without dendrite-like growth, indicative of good safety of the Mg-Li hybrid batteries.
近年来，镁锂混合电池因其潜在的安全性、成本效益和高体积容量而引起了广泛关注。然而，缓慢的动力学性质严重阻碍了它们的商业应用。在本研究中，我们通过固态反应制备了尖晶石LiCrTiO，并进行了一项全面研究，旨在通过优化双盐电解质来提高镁锂混合电池的性能。已发现LiCrTiO在1 m LiCl和0.3 m APC（全苯基配合物）电解质中分别显示出178和169 mA h g的可逆放电/充电容量。当APC的浓度增加到0.4 m时，LiCrTiO在30次循环后显示出95%的高容量保持率。此外，在双盐体系中，LiCrTiO电极未观察到相变，表明具有高电化学可逆性。非原位EDX和SEM研究表明，只有锂离子插入到阴极侧，而镁离子可逆地沉积在镁金属表面，没有枝晶状生长，这表明镁锂混合电池具有良好的安全性。
