Bimetallic cyanide-bridged coordination polymers as lithium ion cathode materials: Core@Shell nanoparticles with enhanced cyclability

Daisuke Asakura, Carissa H. Li, Yoshifumi Mizuno, Masashi Okubo*, Haoshen Zhou, Daniel R. Talham

*この研究の対応する著者

研究成果: Article査読

167 被引用数 (Scopus)

抄録

Prussian blue analogues (PBAs) have recently been proposed as electrode materials for low-cost, long-cycle-life, and high-power batteries. However, high-capacity bimetallic examples show poor cycle stability due to surface instabilities of the reduced states. The present work demonstrates that, relative to single-component materials, higher capacity and longer cycle stability are achieved when using Prussian blue analogue core@shell particle heterostructures as the cathode material for Li-ion storage. Particle heterostructures with a size dispersion centered at 210 nm composed of a high-capacity K0.1Cu[Fe(CN)6]0.7·3. 8H2O (CuFe-PBA) core and lower capacity but highly stable shell of K0.1Ni[Fe(CN)6]0.7·4.1H2O have been prepared and characterized. The heterostructures lead to the coexistence of both high capacity and long cycle stability because the shell protects the otherwise reactive surface of the highly reduced state of the CuFe-PBA core. Furthermore, interfacial coupling to the shell suppresses a known structural phase transition in the CuFe-PBA core, providing further evidence of synergy between the core and shell. The structure and chemical state of the heterostructure during electrochemical cycling have been monitored with ex situ X-ray diffraction and X-ray absorption experiments and compared to the behavior of the individual components.

本文言語English
ページ(範囲)2793-2799
ページ数7
ジャーナルJournal of the American Chemical Society
135
7
DOI
出版ステータスPublished - 2013 2月 20
外部発表はい

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学

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