A photo-cross-linkable polymeric binder for silicon anodes in lithium ion batteries
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- A photo-cross-linkable polymeric binder for silicon anodes in lithium ion batteries
- Park, Yuwon; Lee, Sueun; Kim, Si-Hoon; Jang, Bo Yun; Kim, Joon Soo; Oh, Seung M.; Kim, Ju-Young; Choi, Nam-Soon; Lee, Kyu Tae; Kim, Byeong-Su
- Crosslinked structures; Cycle performance; High reversible capacities; Lithium-ion battery; Photo-cross-linked; Polyacrylic acids; Polymeric binder; Swelling measurements
- Issue Date
- ROYAL SOC CHEMISTRY
- RSC ADVANCES, v.3, no.31, pp.12625 - 12630
- A new photo-cross-linkable poly(acrylic acid) (PAA) polymer functionalized with a photoreactive benzophenone group (PAA-BP) was synthesized and examined as a binder for Si-based anodes. Upon UV irradiation, the PAA-BP binders formed an irreversible cross-linked structure through the formation of a new three-dimensional C-C bond network between the benzophenone moiety and the PAA backbone. The photo-cross-linked PAA-BP binder demonstrated a marginal volume expansion (38%) after full lithiation, compared to conventional binders and this resulted in an improved cycle performance of the Si anode over 100 cycles with a high reversible capacity of ca. 1600 mA h g-1. We attributed this phenomenon to the enhanced mechanical properties of the photo-cross-linked PAA-BP binder, which were evaluated using nanoindentation and swelling measurements.
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