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

Abstract

LiNi 0.5 Mn 1.5 O 4 (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.

Towards Efficient Polymeric Binders for Transition Metal Oxides‐based Li‐ion Battery Cathodes

“…The degradation of TMOC due to various factors such as acidic media, [13] elevated temperature [14] and particularly the oxidative decomposition of electrolytes at high operating voltages, [15] inevitably leads to the dissolution of TM ions. [16] When PVdF binder was used for TMOCs, it covered the active particles and generated a porous network rather than a dense and uniform coating layer. [17] Consequently, the soluble TM ions acting as catalysts not only expedite the irreversible parasitic reactions at the cathode/electrolyte interfaces, but migrate and deposit on the anode surface via ion exchange, causing continuous breakage and regrowth of the solid electrolyte interface (SEI).…”

Polyacrylonitrile Based Triblock Copolymer Binder Enabling Excellent Performance toward LiNi0.5Mn1.5O4 and Sulfur Based Batteries

“…After 300 cycles, the capacity remained higher than 100 mAh g −1 . Yang et al 26 developed a novel network binder based on xylan and sodium alginate (SA), and the abundant hydroxyl and carboxyl moieties can easily reduce Mn dissolution and inhibit electrolyte decomposition. An initial discharge capacity of 130.74 mAh g −1 is presented and a capacity of 130.43 mAh g −1 is maintained after 200 cycles.…”