EUBCE 2026 - GeunWoo HAN - Synthesis and Property Evaluation of Lignin-Based Binders for Rechargeable Battery Anodes

Synthesis and Property Evaluation of Lignin-Based Binders for Rechargeable Battery Anodes

Short Introductive summary

An aqueous anode binder polymer, Lignin-g-(PVA-g-PAA) was synthesized by grafting monomers onto a lignin backbone. The polymer was characterized by FT-IR, ¹H-NMR, DSC, and TGA to confirm structure and thermal behavior. Using the synthesized binder, we formulated a silicon (Si) anode slurry and applied it to copper (Cu) foil, followed by evaluation of physical properties (e.g., adhesion/peel and film stability). The successful synthesis of Lignin-g-(PVA-g-PAA) was verified by FT-IR and 1H-NMR: a broad O–H band at 3000–3500 cm?¹ (lignin and PAA), a strong C=O stretch near ~1700 cm?¹ (PAA), and a distinct C–O stretch around ~1300 cm?¹ (PVA) were observed. Gel permeation chromatography showed an increased weight-average molecular weight (Mw = 5.30×10^5 Da). The results indicate that lignocellulosic biomass–derived lignin, via a graft-copolymer strategy, holds promise as a water-processable anode binder for rechargeable batteries. Future work will include systematic electrochemical assessment (e.g., CV, cycling, and rate capability) and process optimization to advance practical applicability.

G. Han, Seoul National University, Seoul, REPUBLIC OF KOREA
Y. Cho, Seoul National University, Seoul, REPUBLIC OF KOREA
J. Shin, Seoul National University, Seoul, REPUBLIC OF KOREA
H. Kim, Seoul National University, Seoul, REPUBLIC OF KOREA
H. Kwak, Seoul National University, Seoul, REPUBLIC OF KOREA
H. Yeo, Seoul National University, Seoul, REPUBLIC OF KOREA
I. Choi, Seoul National University, Seoul, REPUBLIC OF KOREA