Sulfated Alginate as an Effective Polymer Binder for High-Voltage LiNi0.5Mn1.5O4Electrodes in Lithium-Ion Batteries

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Abstract

Although the increasing demand for high-energy-density lithium-ion batteries (LIBs) has inspired extensive research on high-voltage cathode materials, such as LiNi0.5Mn1.5O4 (LNMO), their commercialization is hindered by problems associated with the decomposition of common carbonate solvent-based electrolytes at elevated voltages. To address these problems, we prepared high-voltage LNMO composite electrodes using five polymer binders (two sulfated and two nonsulfated alginate binders and a poly(vinylidene fluoride) conventional binder) and compared their electrochemical performances at ∼5 V vs Li/Li+. The effects of binder type on electrode performance were probed by analyzing cycled electrodes using soft/hard X-ray photoelectron spectroscopy and scanning transmission electron microscopy. The best-performing sulfated binder, sulfated alginate, uniformly covers the surface of LNMO and increased its affinity for the electrolyte. The electrolyte decomposition products generated in the initial charge-discharge cycle on the alginate-covered electrode participated in the formation of a protective passivation layer that suppressed further decomposition during subsequent cycles, resulting in enhanced cycling and rate performances. The results of this study provide a basis for the cost-effective and technically undemanding fabrication of high-energy-density LIBs.

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Oishi, A., Tatara, R., Togo, E., Inoue, H., Yasuno, S., & Komaba, S. (2022). Sulfated Alginate as an Effective Polymer Binder for High-Voltage LiNi0.5Mn1.5O4Electrodes in Lithium-Ion Batteries. ACS Applied Materials and Interfaces, 14(46), 51808–51818. https://doi.org/10.1021/acsami.2c11695

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