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In Situ Chelating Synthesis of Hierarchical LiNi1/3 Co1/3 Mn1/3 O2 Polyhedron Assemblies with Ultralong Cycle Life for Li-Ion Batteries.

Yue ZhangDianzeng JiaYakun TangYudai HuangWeikong PangZaiping GuoZhang Zhang
Published in: Small (Weinheim an der Bergstrasse, Germany) (2018)
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 LiNi1/3 Co1/3 Mn1/3 O2 polyhedron 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.
Keyphrases
  • transition metal
  • ion batteries
  • solid state
  • gold nanoparticles
  • high resolution
  • high throughput
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