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A study on molecular weight controlled conducting polymer-based binder for high-performance lithium-ion battery anodes

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(8), pp.2081-2090
  • DOI : 10.1007/s42823-024-00745-x
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : April 8, 2024
  • Accepted : April 28, 2024
  • Published : December 5, 2024

Kim Dong Seok 1,  Kim Sung Hyun 1,  Hong Jin-Yong 2

1원광대학교
2한국화학연구원

Accredited

ABSTRACT

To improve the lithium-ion battery performance and stability, a conducting polymer, which can simultaneously serve as both a conductive additive and a binder, is introduced into the anode. Water-soluble polyaniline:polystyrene sulfonate (PANI:PSS) can be successfully prepared through chemical oxidative polymerization, and their chemical/mechanical properties are adjusted by varying the molecular weight of PSS. As a conductive additive, the PANI with a conjugated double bond structure is introduced between active materials or between the active material and the current collector to provide fast and short electrical pathways. As a binder, the PSS prevents short circuits through strong π‒π stacking interaction with active material, and it exhibits superior adhesion to the current collector, thereby ensuring the maintenance of stable mechanical properties, even under high-speed charging/discharging conditions. Based on the synergistic effect of the intrinsic properties of PANI and PSS, it is confirmed that the anode with PANI:PSS introduced as a binder has about 1.8 times higher bonding strength (0.4 kgf/20 mm) compared to conventional binders. Moreover, since active materials can be additionally added in place of the generally added conductive additives, the total cell capacity increased by about 12.0%, and improved stability is shown with a capacity retention rate of 99.3% even after 200 cycles at a current rate of 0.2 C.

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This paper was written with support from the National Research Foundation of Korea.
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