Further demand for higher energy density of lithium-ion batteries (LIBs) is growing, especially for the development of electric vehicles to reduce dependence on fossil fuel. Although Co/Ni ions are used as positive electrode materials, its depletion of material resources is an emerging problem. Among electrode materials with 3d transition metal ions, LiVO_2 with a layered rocksalt structure (s.g. R-3m) is known to be electrochemical inactive, associated with phase transition during charge. Nevertheless, our group has reported Li-excess Li_3NbO_4-LiVO_2 binary oxides, and Li_(1.25)Nb_(0.25)V_(0.5)O_2 on this binary system with a cation disordered rocksalt structure delivers a large reversible capacity of 250 mA h g~(-1) with two-electron redox of V~(3+)N~(5+) at room temperature. In this study. Instead of Li_3NbO_4, Li_2TiO_3-LiVO_2 binary oxides are targeted as potential high capacity positive electrode materials. We also discuss the possibility of high capacity and long cycle life batteries without Co/Ni ions in the future.
展开▼
机译：对锂离子电池（LIBS）更高能量密度的进一步需求正在增长，特别是对于电动车辆的发展，以减少对化石燃料的依赖性。尽管使用CO / Ni离子作为正极材料，但其耗尽材料资源是一种新出现的问题。在具有3D过渡金属离子的电极材料中，已知具有层状岩石结构的Livo_2（R-3M）是电化学无效的，与电荷期间的相变相关。尽管如此，我们的小组报告了锂过量的Li_3nbo_4-livo_2二进制氧化物，并且在该二元系统上的Li_（1.25）Nb_（0.25）v_（0.5）O_2，具有阳离子紊乱的岩石结构，可提供250 ma Hg的巨大可逆容量〜（ -1）在室温下具有两种v〜（3+）n〜（5+）的两电子氧化还原。在这项研究中。而不是Li_3nbo_4，Li_2TiO_3-Livo_2二进制氧化物靶向潜在的高容量正极材料。我们还讨论了未来没有CO / NI离子的高容量和长循环寿命电池的可能性。
展开▼
