Hierarchical Chitin Fibers with Aligned Nanofibrillar Architectures: A Nonwoven-Mat Separator for Lithium Metal Batteries

Abstract

Here, we introduce regenerated fibers of chitin (Chiber), the second most abundant biopolymer after cellulose, and propose its utility as a nonwoven fiber separator for lithium metal batteries (LMBs) that exhibits an excellent electrolyte-uptaking capability and Li-dendrite-mitigating performance. Chiber is produced by a centrifugal jet-spinning technique, which allows a simple and fast production of Chibers consisting of hierarchically aligned self-assembled chitin nanofibers. Following the scrutinization on the Chiber-Li-ion interaction via computational methods, we demonstrate the potential of Chiber as a nonwoven mat-type separator by monitoring it in Li-O and Na-O cells.

Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries

“…To address the problems associated with Li metal anodes, researchers have investigated various approaches, including artificial SEI layers on the Li metal electrodes, optimized electrolyte compositions, modified current collectors, 3D composite Li anodes, and guiding matrixes on Li anodes . While most of the strategies, aiming at stabilizing the SEI layer and/or decreasing the effective current density on the Li metal, were focused on the Li metal and electrolytes, little effort has so far been made to circumvent the problems by modifying the separator . This is somewhat surprising given that the separator is one of the indispensable components in batteries .…”

Recent progress on biomass‐derived ecomaterials toward advanced rechargeable lithium batteries

“…Notably, in addition to excellent heat tolerance, cellulose‐based separators hold one of prominent advantages in narrow nanopore distribution. When used for Li protection in a Li metal battery, cellulose‐based membranes can effectively regulate the Li ion flux on the surface of Li anode and contribute to the safe Li plating with a dendrite‐free morphology …”

“…When used for Li protection in a Li metal battery, cellulose-based membranes can effectively regulate the Li ion flux on the surface of Li anode and contribute to the safe Li plating with a dendrite-free morphology. 72,73…”

Dendrite‐Free Lithium Anodes with a Metal Organic Framework‐Derived Cake‐like TiO2 Coating on the Separator

“…Much effort has been made to solve the above problems by functional modification of separators, which are important component of batteries . The growth and formation of dendritic lithium can penetrate the loose and porous separators .…”