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Article

Eco-Friendly Water-Processable Polyimide Binders with High Adhesion to Silicon Anodes for Lithium-Ion Batteries

1
Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea
2
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
3
Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Korea
4
Korea Research Institute of Chemical Technology (KRICT) School, University of Science and Technology, Daejeon 34113, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Pedro Gómez-Romero
Nanomaterials 2021, 11(12), 3164; https://doi.org/10.3390/nano11123164
Received: 19 October 2021 / Revised: 17 November 2021 / Accepted: 19 November 2021 / Published: 23 November 2021
(This article belongs to the Special Issue Emerging Nanomaterials for Lithium-Sulfur Batteries and Beyond II)
Silicon is an attractive anode material for lithium-ion batteries (LIBs) because of its natural abundance and excellent theoretical energy density. However, Si-based electrodes are difficult to commercialize because of their significant volume changes during lithiation that can result in mechanical damage. To overcome this limitation, we synthesized an eco-friendly water-soluble polyimide (W-PI) precursor, poly(amic acid) salt (W-PAmAS), as a binder for Si anodes via a simple one-step process using water as a solvent. Using the W-PAmAS binder, a composite Si electrode was achieved by low-temperature processing at 150 °C. The adhesion between the electrode components was further enhanced by introducing 3,5-diaminobenzoic acid, which contains free carboxylic acid (–COOH) groups in the W-PAmAS backbone. The –COOH of the W-PI binder chemically interacts with the surface of Si nanoparticles (SiNPs) by forming ester bonds, which efficiently bond the SiNPs, even during severe volume changes. The Si anode with W-PI binder showed improved electrochemical performance with a high capacity of 2061 mAh g−1 and excellent cyclability of 1883 mAh g−1 after 200 cycles at 1200 mA g−1. Therefore, W-PI can be used as a highly effective polymeric binder in Si-based high-capacity LIBs. View Full-Text
Keywords: lithium-ion batteries; silicon anodes; binder; polyimide; water-processable lithium-ion batteries; silicon anodes; binder; polyimide; water-processable
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MDPI and ACS Style

So, Y.; Bae, H.-S.; Kang, Y.Y.; Chung, J.Y.; Park, N.K.; Kim, J.; Jung, H.-T.; Won, J.C.; Ryou, M.-H.; Kim, Y.H. Eco-Friendly Water-Processable Polyimide Binders with High Adhesion to Silicon Anodes for Lithium-Ion Batteries. Nanomaterials 2021, 11, 3164. https://doi.org/10.3390/nano11123164

AMA Style

So Y, Bae H-S, Kang YY, Chung JY, Park NK, Kim J, Jung H-T, Won JC, Ryou M-H, Kim YH. Eco-Friendly Water-Processable Polyimide Binders with High Adhesion to Silicon Anodes for Lithium-Ion Batteries. Nanomaterials. 2021; 11(12):3164. https://doi.org/10.3390/nano11123164

Chicago/Turabian Style

So, Yujin, Hyeon-Su Bae, Yi Y. Kang, Ji Y. Chung, No K. Park, Jinsoo Kim, Hee-Tae Jung, Jong C. Won, Myung-Hyun Ryou, and Yun H. Kim. 2021. "Eco-Friendly Water-Processable Polyimide Binders with High Adhesion to Silicon Anodes for Lithium-Ion Batteries" Nanomaterials 11, no. 12: 3164. https://doi.org/10.3390/nano11123164

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