The Role of the Binder/Solvent Pair on the Electrochemical Performance of Aluminium Batteries
- PDF / 1,290,608 Bytes
- 6 Pages / 432 x 648 pts Page_size
- 46 Downloads / 201 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.125
The Role of the Binder/Solvent Pair on the Electrochemical Performance of Aluminium Batteries Jasmin Smajic1, Amira Alazmi1, Pedro M. F. J. Costa1* 1
King Abdullah University of Science and Technology, Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia
ABSTRACT
In energy storage systems, every component that makes up an electrode can greatly affect the electrochemical performance. One example includes the so-called “binders” used in secondary batteries. Herein, we compare the influence of using polyvinylidene fluoride (PVDF) or sodium carboxymethyl cellulose (CMC) on the electrochemical performance of an aluminium chloride battery (ACB) system. The active material of the cathode was a reduced graphene oxide dried under supercritical conditions (RGOCPD). Interestingly, while PVDF enabled one of the highest capacities reported for ACBs, the CMC resulted in a significant degradation of the cell’s performance.
INTRODUCTION A battery electrode commonly consists of four parts that must act synergistically to enable reliable and optimized performance: current collectors, electrochemically active materials, conductive additives and binders. The latter play a crucial role by binding the active material and the conductive additive particles and promoting adhesion to the current collector. Hence, the structural integrity of the electrode is ensured. The binder is usually dissolved in a solvent, therefore, a proper choice of the binder/solvent pair can greatly influence the electrode’s electrochemical response. Generally, polyvinylidene fluoride (PVDF) and n-methyl-2-pyrrolidone (NMP) are accepted as the default binder/solvent pair, respectively, for lithium-ion batteries. [1] However, it seems logical that each and every battery should be optimized with regards to their specific components. For instance, sodium carboxymethyl cellulose (CMC) is a binder that presents some attractive advantages over PVDF such as being soluble in water, biocompatible and having stronger adhesive and dispersing properties.
Downloaded from https://www.cambridge.org/core. Iowa State University Library, on 26 Mar 2019 at 14:37:14, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.125
In a previous study, [2] we reported that the pore size distribution of the active material had a decisive effect on the electrochemical performance of aluminum chloride batteries (ACBs). Here, we show that the choice of the binder/solvent pair is another factor to carefully assess in the optimization of ACBs. EXPERIMENTAL DETAILS Materials synthesis and characterization To prepare the electrolyte, [EMIm]Cl was dehydrated in a tube furnace (in vacuo, at 70 °C and for 16 hours) and taken to an Ar-filled glove box (
Data Loading...
