Effect of PEDOT:PSS Coating on Manganese Oxide Nanowires for Lithium Ion Battery Anodes

In Hwan Ko, Seong Jun Kim, Joohyun Lim, Seung Ho Yu, Jihoon Ahn, Jin Kyu Lee, Yung Eun Sung

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Transition metal oxides have been considered as promising lithium storage materials that undergo a conversion reaction, exhibiting high specific capacity. However, capacity fading during cycling is the most serious obstacle for their commercialization. In order to overcome this, we have added PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) to Mn2O3 nanowires. PEDOT:PSS was successfully coated onto Mn2O3 nanowires while maintaining the structure of Mn2O3. The coating of PEDOT:PSS reduced the resistance of the surface and protected the surface electron channels from the pulverization effect of the charge-discharge operation. α-Mn2O3/PEDOT:PSS showed excellent cyclability with a reversible capacity of 1450 mAh g-1 after 200 cycles at a current density of 100 mA g-1. An increase in capacity was observed with continuous cycling, which may be attributed to further oxidation of the manganese species and a reversible reaction of the gel-like polymer on the manganese surface. The results demonstrate that PEDOT:PSS enhances the electrochemical activity by providing electron channels and prevents pulverization caused by the charge and discharge process.

Original languageEnglish
Pages (from-to)340-347
Number of pages8
JournalElectrochimica Acta
Volume187
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • PEDOT:PSS
  • abnormal capacity
  • capacity increasing
  • lithium ion battery
  • manganese oxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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