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Carrageenan as a Sacrificial Binder for 5 V LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Cathodes in Lithium-Ion Batteries

Cited 2 time in Web of Science Cited 6 time in Scopus

Chang, Barsa; Yun, Dae Hui; Hwang, Insu; Seo, Joon Kyo; Kang, Joonhee; Noh, Gyeongho; Choi, Sunghun; Choi, Jang Wook

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WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Materials, Vol.35 No.45, p. GmbH2303787
5 V-class LiNi0.5Mn1.5O4 (LNMO) with its spinel symmetry is a promising cathode material for lithium-ion batteries. However, the high-voltage operation of LNMO renders it vulnerable to interfacial degradation involving electrolyte decomposition, which hinders long-term and high-rate cycling. Herein, this longstanding challenge presented by LNMO is overcome by incorporating a sacrificial binder, namely, lambda-carrageenan (CRN), a sulfated polysaccharide. This binder not only uniformly covers the LNMO surface via hydrogen bonding and ion-dipole interaction but also offers an ionically conductive cathode-electrolyte interphase layer containing LiSOxF, a product of the electrochemical decomposition of the sulfate group. Taking advantage of these two auspicious properties, the CRN-based electrode exhibits cycling and rate performance far superior to that of its counterparts based on the conventional poly(vinylidene difluoride) and sodium alginate binders. This study introduces a new concept, namely "sacrificial" binder, for battery electrodes known to deliver superior electrochemical performance but be adversely affected by interfacial instability.
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  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Physics, Materials Science


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