Flexible fibrous structure of bacterial cellulose by synergic role carboxymethyl cellulose and glycerol for LiB polymer electrolyte

Abstract

In this work, we report a flexible nanofibrous cellulose nanocomposite with great potential for lithium-ion battery (LiB) polymer electrolyte. Flexible and fibrous material is synthesized using a simple and easy technique by synergistically combining carboxymethyl cellulose (CMC) and glycerol (Gly). Flexible porous cellulose forms a three-dimensional network for the mobility of Li ions in the polymer electrolyte of LIB systems. We investigated the effect ionic liquid of flexible fibrous cellulose (BC-CMC-Gly) on the electrochemical properties. The surface interaction between Li ions and the porous network is a key parameter demonstrated by the Li-ion emission line at 610.37 nm using laser inductance breakdown spectroscopy (LiBS). The ionic conductivity of BC-CMC-Gly characterized by EIS measurement is about 1.1 × 10 ^−3 S cm ^−1 . According to linear sweep voltammetry (LSV), BC-CMC-Gly, with a potential window of 4.3 V, shows a more expansive window voltage than pure BC (2.75 V) and BC-CMC (3.3 V). This indicates that the electrochemical stability is good, as wide as the range of voltages that the electrode reactions define. The specific capacity of BC-CMC-Gly containing IL is very high, about 27.6 mAh g ^−1 compared to BC (7.4 mAh g ^−1 ) and BC-CMC (11,5 mAh g ^−1 ). All these findings clearly show that forming plasticized structures synergistically with CMC trapped in the BC structure results in the largest Li-ion adsorption capacity and electrochemical performance improvement. Thermal stability up to 200 °C and electrolyte uptake of approx. 189% are the beneficial properties of BC-CMC-Gly fibrous cellulose for LiB electrolyte polymer.

Keywords

• polymer electrolytes
• bacterial cellulose
• ionic liquid
• carboxymethyl cellulose
• glycerol
• Li-ion batteries