Self-assembled organic nanowires for high power density lithium ion batteries

Chao Luo, Ruiming Huang, Ruslan Kevorkyants, Michele Pavanello, Huixin He, Chunsheng Wang

Research output: Contribution to journalArticle

129 Scopus citations

Abstract

The electroactive organic materials are promising alternatives to inorganic electrode materials for the new generation of green Li-ion batteries due to their sustainability, environmental benignity, and low cost. Croconic acid disodium salt (CADS) was used as Li-ion battery electrode, and CADS organic wires with different diameters were fabricated through a facile synthetic route using antisolvent crystallization method to overcome the challenges of low electronic conductivity of CADS and lithiation induced strain. The CADS nanowire exhibits much better electrochemical performance than its crystal bulk material and microwire counterpart. CADS nanowire with a diameter of 150 nm delivers a reversible capability of 177 mAh g-1 at a current density of 0.2 C and retains capacity of 170 mAh g-1 after 110 charge/discharge cycles. The nanowire structure also remarkably enhances the kinetics of croconic acid disodium salt. The CADS nanowire retains 50% of the 0.1 C capacity even when the current density increases to 6 C. In contrast, the crystal bulk and microwire material completely lose their capacities when the current density merely increases to 2 C. Such a high rate performance of CADS nanowire is attributed to its short ion diffusion pathway and large surface area, which enable fast ion and electron transport in the electrode. The theoretical calculation suggests that lithiation of CADS experiences an ion exchange process. The sodium ions in CADS will be gradually replaced by lithium ions during the lithiation and delithiation of CADS electrode, which is confirmed by inductively coupled plasma test.

Original languageEnglish (US)
Pages (from-to)1596-1602
Number of pages7
JournalNano Letters
Volume14
Issue number3
DOIs
StatePublished - Mar 12 2014

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • Lithium ion battery
  • antisolvent crystallization synthesis
  • croconic acid disodium salt
  • high power density
  • organic nanowire

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