Designing New Lithium-Excess Cathode Materials from Percolation Theory: Nanohighways in Li x Ni 2–4 x /3 Sb x /3 O 2

作者：Nancy Twu, Xin Li, Alexander Urban, Mahalingam Balasubramanian, Jinhyuk Lee, Lei Liu, Gerbrand Ceder · 发表于：Nano Letters · 年份：2014 · DOI：10.1021/nl5040754 · 被引用次数：57 · 研究领域：Advancements in Battery Materials、Extraction and Separation Processes、Advanced Battery Materials and Technologies

Increasing lithium content is shown to be a successful strategy for designing new cathode materials. In layered Li(x)Ni(2-4x/3)Sb(x/3)O2 (x = 1.00-1.15), lithium excess improves both discharge capacity and capacity retention at 1C. Structural studies reveal a complex nanostructure pattern of Li-Sb and Ni-Sb ordering where the interface between these domains forms the correct local configuration for good lithium mobility. The <1 nm Li-Sb stripe domains and their interfaces thereby effectively act as nanohighways for lithium diffusion.