Fenugreek gum (FG), a naturally non

Fenugreek gum (FG), a naturally non-toxic polysaccharide, which is derived from the endosperm of the seeds of fenugreek, is a highly branched polysaccharide [16]. It is a galactomannan composed of α(1/4)-β-d-mannan backbone attached to single α-d-galactopyranosyl groups at the O-6 position of d-mannopyranosyl residues [17-18]. Fenugreek gum and its derivatives terminate wit carboxyl, hydroxyl and ester groups in their molecular chains, which result in excellent water solubility and higher viscosity, and produce good binding potential [18,19]. The carboxyl groups and hydroxyl groups along the carboxymethyl fenugreek gum chains will be conducive to many combination sites in the active material, conductive agent and current collector, promoting electrical and ionic conductivity, maintaining electrode integrity and realizing well dispersion in the preparation process of slurry and electrode [20]. These characteristics are conducive to the use of aqueous binders in electrochemical devices.