Jump to main content
Jump to site search


Pyrolysis of Cyano-Bridged Hetero-Metallic Aerogels: A General Route to Immobilize Sn–M (M=Fe, Ni) Alloys within Carbon Matrix for Stable and Fast Lithium Storage

Abstract

The practical application of Sn–M (M = Fe, Ni, Co, and Cu) alloys, a promising anodic category for lithium-ion batteries, is hindered primarily by their huge volume change upon cycling. Immobilization Sn–M alloys within carbon matrices has proved to be effective to improve their cycling stability, but the traditional pyrolysis of separate Sn, M, and C precursors often leads to uneven distribution of the three components in Sn–M–C ternary anodes. Herein, we report a facile and general aerogel-derived pyrolysis route to realize homogeneous embedding of uniformly-sized Sn–M alloy nanocrystals within nanoporous carbon matrix, using cyano-bridged hetero-metallic (Sn–M) aerogels hybridized with carbon sources as precursors. Using optimized citric acid (CA) as a carbon source, the formation of nanoporous Sn–Fe@C and Sn–Ni@C networks have been illustrated as examples through pyrolyzing CA/Sn–Fe and CA/Sn–Ni aerogels, respectively. By virtue of their compositional/structural superiorities toward lithium storage, the as-prepared Sn–Fe@C and Sn–Ni@C networks manifest higher capacities, enhanced cycling stability, and improved rate capability than the Sn–M–C composites and carbon sample derived from bare areogel and CA precursors, respectively. Specifically, the Sn–Fe@C network manifests a high reversible capacity of 441.6 mA h g-1 after 100 cycles at 100 mA g-1 and an average capacity of 438.6 mA h g-1 at 1 A g-1. This work opens a new guideline for designing highly-uniform Sn–M–C, Sb–M–C, and Bi–M–C ternary anodes for boosting energy storage.

Back to tab navigation

Supplementary files

Publication details

The article was received on 11 Sep 2017, accepted on 31 Jan 2018 and first published on 01 Feb 2018


Article type: Paper
DOI: 10.1039/C7NR06768B
Citation: Nanoscale, 2018, Accepted Manuscript
  •   Request permissions

    Pyrolysis of Cyano-Bridged Hetero-Metallic Aerogels: A General Route to Immobilize Sn–M (M=Fe, Ni) Alloys within Carbon Matrix for Stable and Fast Lithium Storage

    H. Shi, A. Zhang, X. Zhang, H. Yin, S. Wang, Y. Tang, Y. Zhou and P. Wu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR06768B

Search articles by author

Spotlight

Advertisements