Structure-Performance Relationship of Aromatic Polymer Binder for Silicon Anode in Lithium-Ion Batteries
- Authors
- Kim, Junho; Kim, Gyuri; Park, You Kyung; Lim, Gayoung; Kim, Seung Tae; Jung, In Hwan; Kim, Hansu
- Issue Date
- Oct-2023
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Li-ion batteries; polymer binders; silicon anodes; soft-hard copolymers; tensile stress-strain relationship
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.33, no.44, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 33
- Number
- 44
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/193000
- DOI
- 10.1002/adfm.202303810
- ISSN
- 1616-301X
- Abstract
- Polymer binders are essential for Silicon (Si) anode-based lithium-ion batteries (LIBs). However, the synthetic guidance for aromatic polymer binder is relatively less explored compared to aliphatic polymer binders. In this study, polyimide-based aromatic polymer binders are developed that have strong binding affinity with Si particles, a conductive agent and copper (Cu) current collector, and they show an improved initial discharge capacity of 2663 mAh g(-1), which is 29% higher than that of Kapton-based one (2071 mAh g(-1)). The copolymerization between "hard" and "soft" segments is crucial to achieve reversible volume expansion/contraction during the repeated charging/discharging process, resulting in the best cycle performance. The new binder ensures both excellent volume retention after full-delithiation and allowed volume expansion at least to some extent upon full-lithiation. This Study finds a power-law relationship between the capacity of Si anode and the mechanical properties of the binder, i.e., the tensile stress (& sigma;) and strain (e). The initial discharge capacity is proportional to & sigma;(n) & BULL; e (n = 2.3-2.7). Such an understanding of the relationships between polymer structure, mechanical properties of the polymer and binder performance clearly revealed the importance of the soft-hard polymer structure for aromatic binders used in Si-based high-capacity lithium storage materials.
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