Lithium-ion battery separator membranes based on poly(L-lactic acid) biopolymer

Abstract

Sustainable materials are increasingly needed in lithium ion batteries in order to reduce their environmental impact and improve their recyclability. This work reports on the production of separators using poly (L-lactic acid) (PLLA) for lithium ion battery applications. PLLA separators were obtained by solvent casting technique, by varying polymer concentration in solution between 8 wt.% and 12 wt.% in order to evaluate their morphology, thermal, electrical and electrochemical properties. It is verified that morphology and porosity can be tuned by varying polymer concentration and that the separators are thermally stable up to 250 ºC. The best ionic conductivity of 1.6 mS/cm was obtained for the PLLA separator prepared from 10 wt.% polymer concentration in solution, due to the synergistic effect of the morphology and electrolyte uptake. For this membrane, a high discharge capacity value of 93 mAh.g -1 was obtained at the rate of 1C.In this work, it is demonstrated that PLLA is a good candidate for the development of separator membranes, in order to produce greener and environmentally friendly batteries in a circular economy context.

2D Polymer Nanonets: Controllable Constructions and Functional Applications

“…[140] Therefore, it required the separators to possess interconnected pore channels together with high porosity, which as a result could absorb a large amount of liquid electrolytes and simultaneously offer effective conduction channels for high ionic conductivity and good electrochemical properties. [141,142] The most widely used porous separators in LIBs include microporous plastic films fabricated by solvent casting [143,144] or phase separation, [145,146] and nonwoven fabrics prepared by melt blowing, [147,148] spun-bonding, [149] electrospinning, [150,151] and electrospinning/netting. [152] Among these porous separators prepared by different methods, porous polymer nanonets were considered as potential candidates for preparing separators of LIBs due to their small pore size, high porosity, and good interconnectivity.…”

Sustainable Lithium‐Ion Battery Separator Membranes Based on Carrageenan Biopolymer

“…136.4/-0.71 120@2C (LCO) [16a] Cellulose nanofibrils/nanoclay composite 260/68 0.977 160@2C (NCM 811) [40] Clay nanorods (attapulgite, ATP) and polyvinylalcohol (PVA) 168.2/45.8 0.782 125@1C (LFP) [41] Cyanoethyl-chitin nanofiber (CCN) 439/-0.45 119.5@1C (LFP) [15] Poly(L-lactic acid) 345/72 1.6 93@1C (LFP) [42] Sodium alginate (Na-Alg) -/--116@0.5C (NCM) [43] Sodium alginate/attapulgite 420/-…”

Review on the Revolution of Polymer Electrolytes for Dye-Sensitized Solar Cells

“…Generally, doping salt is widely used and plays a vital role in the conduction of electrolytes. Numerous salts have been reported in the electrolytes for various electrochemical devices such as magnesium trifluoromethanesulfonate (MgTf 2 ) , lithium triflate (LiTF), lithium bis­(oxalato)­borate (LiBOB), lithium phosphate (LiPO 4 ), etc. ,− In DSSCs performance, the redox mediator is a vital electrolyte component that functions to regenerate dye and ionic transport between the working electrode and counter electrode. , Commonly in DSSC, iodide/tri-iodide (I – /I 3 – ) redox pair is the most favorite choice for efficient performance . These redox pairs have produced efficiency up to 12.6% under the sun illumination achieved by the EPFL group. , Besides, incorporating iodide salt into the electrolytes could affect their ionic conductivity as well as the J SC of DSSC.…”