Improvement of Cycling Performance of Na2/3Co2/3Mn1/3O2 Cathode by PEDOT/PSS Surface Coating for Na Ion Batteries

Yatim Lailun Ni’mah (Department of Chemistry, Institut Teknologi Sepuluh Nopember)
Ju Hsiang Cheng (Department of Chemical Engineering, National Taiwan University of Science and Technology)
Ming Yao Cheng (Department of Chemical Engineering, National Taiwan University of Science and Technology)
Wei Nien Su (Department of Chemical Engineering, National Taiwan University of Science and Technology)
Bing Joe Hwang (Department of Chemical Engineering, National Taiwan University of Science and Technology National Synchrotron Radiation Research Center)

Indonesian Journal of Chemistry
Vol 18, No 1 (2018)

The surface-modified Na2/3Co2/3Mn1/3O2 is coated with a conductive Poly (3,4-Ethylene dioxy thiophene)-poly (styrene sulfonate) (PEDOT/PSS) polymer, and their resulting electrochemical properties were investigated as Na-ion battery cathode. The surface-modified Na2/3Co2/3Mn1/3O2 cathode material exhibits a high discharge capacity and good rate capability due to enhanced electron transport by surface PEDOT/PSS. The presence of PEDOT/PSS surface layer suppresses the growth of a resistive layer, while the dissolution of transition metals of the active cathode materials is inhibited as well. The resulting surface-modified Na2/3Co2/3Mn1/3O2 shows superior cycling performance, which is much stable than the pristine one as being the Na-ion battery cathode.