S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Rational sulfur cathode design for lithium-sulfur batteries: Sulfur-embedded benzoxazine polymers
- Je, Sang Hyun; Hwang, Tae Hoon; Talapaneni, Siddulu Naidu; Buyukcakir, Onur; Kim, Hyeon Jin; Yu, Ji-Sang; Woo, Sang-Gil; Jang, Min Chul; Son, Byoung Kuk; Coskun, Ali; Choi, Jang Wook
- Issue Date
- Acs Energy Letters, Vol.1 No.3, pp.566-572
- A variety of advanced electrode structures have been developed lately to address the intrinsic drawbacks of lithium sulfur batteries, such as polysulfide shuttling and low electrical conductivity of elemental sulfur. Nevertheless, it is still desired to find electrode structures that address those issues through an easy synthesis while securing large sulfur contents (i.e., > 70 wt %). Here, we report an orthogonal, "one-pot" synthetic approach to prepare a sulfur-embedded polybenzoxazine (S-BOP) with a high sulfur content of 72 wt %. This sulfur-embedded polymer was achieved via thermal ring-opening polymerization of benzoxazine in the presence of elemental sulfur, and the covalent attachment of sulfur to the polymer was rationally directed through the thiol group of benzoxazine. Also, the resulting S-B OP bears a homogeneous distribution of sulfur due to in situ formation of the polymer backbone. This unique internal structure endows S-BOP with high initial Coulombic efficiency (96.6%) and robust cyclability (92.7% retention after 1000 cycles) when tested as a sulfur cathode.
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