Graphitic multi-walled carbon nanotube cathodes for rechargeable Al-ion batteries with well-defined discharge plateaus

Mei Han, Zichuan Lv, Lixue Hou, Shuai Zhou, Haining Cao, Hui Chen, Yue Zhou, Chao Meng, Huiping Du, Mian Cai, Yinghui Bian, Meng Chang Lin

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

One-dimensional multi-walled carbon nanotubes (MWCNTs) are promising electrode materials for rechargeable batteries. This paper reports that graphitic MWCNT (G-MWCNT) can serve as a cathode material for a rechargeable Al-ion battery and exhibits well-defined discharging plateaus at around 2 V. AlCl4intercalates and de-intercalates into/from the graphitic MWCNT rather than simply adsorbing on the surfaces. Hence, the Al||G-MWCNT cell exhibits good electrochemical performance with a specific capacity of 64 mA h g−1 at a current density of 200 mA g−1. The discharge capacity is almost unattenuated and maintained at about 58 mA h g−1 (Coulombic efficiency: 99.5%) after 1000 charge/discharge cycles, which indicates that the Al||G-MWCNT cell has excellent cycling stability. In addition, the low self-discharging rate (~0.4% over 72 h of rest) suggests that the intercalated AlCl4 is stable in the spaces between the graphene layers of G-MWCNT. This work reveals that Al||G-MWCNT cells exhibit diffusion-controlled faradaic process rather than capacitor behavior, which may boost the development of aluminum batteries.

Original languageEnglish
Article number227769
JournalJournal of Power Sources
Volume451
DOIs
Publication statusPublished - Mar 2020
Externally publishedYes

Keywords

  • Aluminum battery
  • Battery behavior
  • Chloroaluminate
  • Ionic liquid
  • MWCNT

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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