Dependency of Electrochemical Performances of Silicon Lithium-Ion Batteries on Glycosidic Linkages of Polysaccharide Binders

Abstract

Molecular structures of polysaccharide binders determining mechanical properties were correlated to electrochemical performances of silicon anodes for lithium-ion batteries. Glycosidic linkages (α and β) and side chains (-COOH and -OH) were selected and proven as the major factors of the molecular structures. Three different single-component polysaccharides were compared: pectin for α-linkages versus carboxylic methyl cellulose (CMC) for β-linkages from the linkage's standpoint, and pectin as a COOH-containing polymer and amylose as its non-COOH counterpart from the side chain's standpoint. Pectin was remarkably superior to CMC and amylose in cyclability and rate capability of battery cells based on silicon anodes. The pectin binder allowed volume expansion of silicon electrodes with keeping high porosity during lithiation due to the elastic nature caused by the chair-to-boat conformation in α-linkages of its backbone. Physical integrity of pectin-based electrodes was not challenged during repeated lithiation/delithiation cycles without crack development that was observed in rigid CMC-based electrodes. Covalent bonds formed between carboxylic side chains of pectin and silicon surface oxide prevented active silicon mass from being detached away from electric pathways. However, hydrogen bonds between hydroxyl side chains of amylose and silicon surface oxide were not strong enough to keep the silicon mass electrochemically active after cyclability tests.

Investigation on xanthan gum as novel water soluble binder for LiFePO 4 cathode in lithium-ion batteries

“…Besides the water-soluble binders mentioned above, some NMP-based binders such as polyaniline (PANI) [16], poly(methyl methacrylate) (PMMA) [17], poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) [18], and sodium alginate functionalized with 3,4-propylenedioxythiophene-2,5-discarboxylic acid (SA-PProDOT) [19] for LFP cathode were also investigated. Apart from the above binders for LFP cathode, various novel binders including pectin [20], lignin [21], hyperbranched β-cyclodextrin…”

Electrospun Carbon/CuxO Nanocomposite material as Sustainable and High Performance Anode for Lithium‐Ion Batteries

“…Another important contribution to the stability and performance of this nanocomposite material, is provided by the Polyacrylic acid binder, which thanks to its high number of carboxylic groups in the polymer backbone, enables the formation of hydrogen bonds with both copper oxide nanoparticles,improving the adhesion with the current collector and the mechanical properties of the electrode. Moreover, as it has been already reported, the PAA binder acts as artificial SEI, which makes up for an additional stabilizing layer during electrochemical cycling. To assess the positive effect of the PAA binder on stability in galvanostatic cycling, a 300 cycles control experiment has been conducted using a PVdF based electrode, and compared with the PAA‐based electrode, as can be seen in Figure S7, in which is apparent the improved stability and capacity retention of the latter.…”

“…To easily obtain innovative morphologies while implementing effective 3‐D support and conducting frameworks, electrospinning has gained much attention due to its relatively easy experimental setup, operational straightforwardness and scale up capabilities . In addition to that, also electrode processing of the final composite material has a determining impact on sustainability and cycling performance . In this work we present the easy and scalable electrospinning synthesis procedure of a Cu 2 O/PAN derived carbon nanocomposite, coupled with an improved and sustainable electrode processing procedure based on the PolyAcrylic Acid (PAA)‐Ethanol binder/solvent couple which ensured high performance on a long cycling life perspective.…”

Water‐soluble binder PAALi with terpene resin emulsion as tackifier for LiFePO4 cathode

“…The details of specific electrode compositions as well as electrochemical properties with these aqueous binders and other NMP‐based binders such as polyaniline (PANI), poly(methyl methacrylate) (PMMA), poly(vinylidenefluoride‐ co ‐hexafluoropropylene) (PVDF–HFP), and sodium alginate functionalized with 3,4‐propylenedioxythiophene‐2,5‐discarboxylic acid (SA–PProDOT) for LFP cathode were concluded explicitly and respectively in Table . Besides the binders mentioned above for LFP cathode, plenty of novel binders such as pectin, lignin, hyperbranched β‐cyclodextrin polymer, multifunctional Meldrum's acid incorporated polymer, and molecule‐level designed conductive polymeric binders are arousing more and more attentions toward the practical application for the promising silicon (Si) anode with high areal capacity and prolonged cycle life. The exploration of promising polysaccharides and elaborate molecular design of multifunctional binders as well as conductive polymeric binders have become the best strategy to obtain a high areal capacity and stable cycling life for both cathode and anode in LIBs.…”