Taichi-inspired rigid-flexible coupling cellulose-supported solid polymer electrolyte for high-performance lithium batteries

Abstract

Inspired by Taichi, we proposed rigid-flexible coupling concept and herein developed a highly promising solid polymer electrolyte comprised of poly (ethylene oxide), poly (cyano acrylate), lithium bis(oxalate)borate and robust cellulose nonwoven. Our investigation revealed that this new class solid polymer electrolyte possessed comprehensive properties in high mechanical integrity strength, sufficient ionic conductivity (3 × 10−4 S cm−1) at 60°C and improved dimensional thermostability (up to 160°C). In addition, the lithium iron phosphate (LiFePO4)/lithium (Li) cell using such solid polymer electrolyte displayed superior rate capacity (up to 6 C) and stable cycle performance at 80°C. Furthermore, the LiFePO4/Li battery could also operate very well even at an elevated temperature of 160°C, thus improving enhanced safety performance of lithium batteries. The use of this solid polymer electrolyte mitigates the safety risk and widens the operation temperature range of lithium batteries. Thus, this fascinating study demonstrates a proof of concept of the use of rigid-flexible coupling solid polymer electrolyte toward practical lithium battery applications with improved reliability and safety.

A Strategy to Make High Voltage LiCoO2Compatible with Polyethylene Oxide Electrolyte in All-Solid-State Lithium Ion Batteries

“…15 The morphology, electrochemical window, and ionic conductivity of the obtained cellulose-supported PEO-LiDFOB electrolyte were characterized and displayed in Figure 4. The SEM images showed that the PEO-LiDFOB electrolyte had smooth surface and a thickness of about 30 μm.…”

Biocompatible and biodegradable solid polymer electrolytes for high voltage and high temperature lithium batteries

“…Finally, it was reported that a cellulose nonwoven membrane supported PEO:PCA:LiBOB SPE displayed ionic conductivity of 1.3 Â 10 À5 S cm À1 at 20 C. 22 These publications demonstrate the possibility of using natural materials for the design and fabrication of SPEs.…”

Effects of potassium iodide (KI) on crystallinity, thermal stability, and electrical properties of polymer blend electrolytes (PVC/PEO:KI)

“…Therefore the free volume around the polymer chain causes to the increase of the conductivity. The amorphous nature also provides a bigger free volume in the polymer blend electrolyte system with increasing temperature [63][64][65]. The activation energy values of different polymer blend electrolytes were calculated from the slopes of linear fit of the Arrhenius plots of different polymer blend electrolytes and these are displayed in Table 3.…”