Alginate-Xylan Biopolymer as a Multifunctional Binder for 5 V High-Voltage LNMO Electrodes

Yan Yang; Yiming Nie; Yang Shen; Jianlun Wei; Keqiang He; Yanxuan Wen; Jing Su

doi:10.1021/acsami.3c01369

Alginate-Xylan Biopolymer as a Multifunctional Binder for 5 V High-Voltage LNMO Electrodes

ACS Appl Mater Interfaces. 2023 May 31;15(21):25909-25918. doi: 10.1021/acsami.3c01369. Epub 2023 May 16.

Authors

Yan Yang¹, Yiming Nie¹, Yang Shen¹, Jianlun Wei¹, Keqiang He¹, Yanxuan Wen^{1

2}, Jing Su^{1

2

3}

Affiliations

¹ School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China.
² Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, P. R. China.
³ Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, Guangxi University, Nanning 530004, P. R. China.

PMID: 37191587
DOI: 10.1021/acsami.3c01369

Abstract

LiNi_0.5Mn_1.5O₄ (LNMO) with a spinel structure is one of the most promising cathode materials choices for Li-ion batteries (LIBs). However, at a high operating voltages, the decomposition of organic electrolytes and the dissolution of transition metals, especially Mn(II) ions, cause unsatisfactory cycle stability. The initial application of a sodium alginate (SA)-xylan biopolymer as an aqueous binder aims to address the aforementioned problems. The SX28-LNMO electrode has a sizable discharge capacity, exceptional rate capability, and long-term cyclability with a capacity retention of 99.8% after 450 cycles at 1C and a remarkable rate capability of 121 mAh g^-1 even at 10C. A more thorough investigation illustrated that SX28 binder provides a substantial adhesion property and generates a uniform (CEI) layer on the LNMO surface, suppressing electrolytes' oxidative decomposition upon cycling and improving LIB performances. This work highlights the potential of hemicellulose as an aqueous binder for 5.0 V high-voltage cathodes.

Keywords: LNMO cathode; Li-ion batteries; binder; cross-link; xylan.