PVDF Latex As a Binder for Positive Electrodes in Lithium-Ion Batteries

Abstract

The present work shows a way to develop an industrial organic solvent-free process for lithium-ion battery electrodes manufacturing. The process uses a water-based slurry to cast the electrodes, using poly vinylidene-fluoride (PVDF) as a polymeric binder. The use of aqueous PVDF latex as a binder in positive electrodes is of difficult integration in existing production lines due to the low stability of lithium cobalt oxide (LiCoO2) in an aqueous environment. The use of electroless plating solves this issue by coating LiCoO2 particles with a copper-based layer stable to water. The presence of copper on the surface of the powders is confirmed by means of SEM, XRF and conductivity measurements of the powders. Electrochemical characterization of the electrodes has been carried out with cycling tests in coin cells, confirming the cycling stability during charge/discharge cycles. Cycling performances of the water-based cathodes containing coated active material particles are comparable to a reference NMP-based cathode, while uncoated particles show a sensibly lower capacity retention during cycling. The possibility of up-scaling the metallization process has been tested with the use of a semi-industrial pilot filter dryer.

Process–structure–property relationships in nanocomposites based on piezoelectric-polymer matrix and magnetic nanoparticles

“…Different polymers like polyvinylidene fluoride (PVDF), copolymers of vinylidene fluoride (VDF), and trifluoroethylene are semicrystalline polymers and have both pyro-and piezoelectric properties (Kang and Cao, 2014;Liang et al, 2014;Spreafico et al, 2014). They are increasingly being used as electro-thermal and electromechanical transducer or sensors with promising medical and industrial applications (Dongliang et al, 1999).…”

Innovative Polymers for Next‐Generation Batteries

“…Among these aqueous binders carbomethyl cellulose and other biopolymers, poly(acrylic acid), SBR latexes, and poly(ethylene oxide) (PEO) were the most successful ones . It is worth to note that some companies have also developed PVDF aqueous formulations to be used as binders …”

“…[5] It is worth to note that some companies have also developed PVDF aqueous formulations to be used as binders. [6] An even more interesting approach is to use binders that have an active functional role in the electrode. To this end, several works reported the use of conducting polymers such as PEDOT/PSS or other polythiophenes in different electrode formulations.…”

Poly(Vinylidene Fluoride)‐Based Blends as New Binders for Lithium‐Ion Batteries

“…However, the problem with water as the solvent is the degradation of lithium cobalt oxide (LCO) in aqueous condition . Spreafico et al . reported a PVDF latex as binder for LCO.…”

“…However, the problem with water as the solvent is the degradation of lithium cobalt oxide (LCO) in aqueous condition. [27] Spreafico et al [28] reported a PVDF latex as binder for LCO. Other water-soluble polymers, such as, b-cyclodextrin, [29] poly(acrylamide-co-diallyl dimethylammonium chloride) , [30] and water-soluble elastomer binder (e. g. styrene butadiene rubber, SBR) from ZEON Corp., [31] were also studied mostly for anode materials, such as graphite and silicon.…”