In Situ Chelating Synthesis of Hierarchical LiNi1/3Co1/3Mn1/3O2Polyhedron Assemblies with Ultralong Cycle Life for Li-Ion Batteries
RIS ID
128957
Abstract
Layered lithium transition-metal oxides, with large capacity and high discharge platform, are promising cathode materials for Li-ion batteries. However, their high-rate cycling stability still remains a large challenge. Herein, hierarchical LiNi1/3Co1/3Mn1/3O2polyhedron assemblies are obtained through in situ chelation of transition metal ions (Ni2+, Co2+, and Mn2+) with amide groups uniformly distributed along the backbone of modified polyacrylonitrile chains to achieve intimate mixing at the atomic level. The assemblies exhibit outstanding electrochemical performances: superior rate capability, high volumetric energy density, and especially ultralong high-rate cyclability, due to the superiority of unique hierarchical structures. The polyhedrons with exposed active crystal facets provide more channels for Li+diffusion, and meso/macropores serve as access shortcuts for fast migration of electrolytes, Li+and electrons. The strategy proposed in this work can be extended to fabricate other mixed transition metal-based materials for advanced batteries.
Publication Details
Zhang, Y., Jia, D., Tang, Y., Haung, Y., Pang, W., Guo, Z. & Zhou, Z. (2018). In Situ Chelating Synthesis of Hierarchical LiNi1/3Co1/3Mn1/3O2Polyhedron Assemblies with Ultralong Cycle Life for Li-Ion Batteries. Small, 14 (27), 1704354-1-1704354-7.