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

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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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Acknowledgements

This work was supported by the Technology Innovation Program (20006777, 20006778) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) and by the Industrial Strategic Technology Development Program (20012763) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) and by the Basic Science Research Program National Research Foundation of Korea (NRF-2021R1I1A3059657) funded by the Ministry of Education.

Funding

Ministry of Trade, Industry and Energy, 20006777, Jin-Yong Hong, 20006778, Jin-Yong Hong, 20012763, Jin-Yong Hong, Ministry of Education, NRF-2021R1I1A3059657, Sung Hyun Kim.

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Authors and Affiliations

  1. Department of Carbon Convergence Engineering, Wonkwang University, 460 Iksan-daero, Iksan, 54538, Republic of Korea

    Dong Seok Kim & Sung Hyun Kim

  2. Center for C1 Gas & Carbon Convergent Research, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Republic of Korea

    Dong Seok Kim & Jin-Yong Hong

  3. Advanced Materials and Chemical Engineering, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea

    Jin-Yong Hong

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  1. Dong Seok Kim
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Contributions

Dong Seok Kim: investigation, visualization, writing original draft. Sung Hyun Kim: supervision, visualization, writing—review and editing, Funding acquisition. Jin-Yong Hong: developed the research plan and experimental strategy, funding acquisition. All authors discussed the results, reviewed and edited the manuscript.

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Correspondence to Sung Hyun Kim or Jin-Yong Hong.

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There are no conflicts of interests or patent pending. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. The authors declare the following financial interests/personal relationships which may be considered as potential competing interests.

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Kim, D.S., Kim, S.H. & Hong, JY. A study on molecular weight controlled conducting polymer-based binder for high-performance lithium-ion battery anodes. Carbon Lett. (2024). https://doi.org/10.1007/s42823-024-00745-x

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