| AVS 66th International Symposium & Exhibition | |
| Energy Transition Focus Topic | Tuesday Sessions |
| Session TL+AS+SS+TF-TuA |
| Session: | Breakthroughs and Challenges in Applied Materials for Energy Transition (ALL INVITED SESSION) & Panel Discussion |
| Presenter: | Burak Esat, Fatih University, Turkey, Rutgers University |
| Authors: | B. Esat, Fatih University, Turkey, Rutgers University S. Bahceci, Fatih University, Turkey S. Akay, Fatih University, Turkey A. Momchilov, Bulgarian Academy of Science, Bulgaria |
| Correspondent: | Click to Email |
We hereby represent novel polymers and reduced graphene oxide with pendant electro-active groups such as TEMPO and quinones.
The first example of polymers with pendant anode-active groups studied in our group is a polymethacrylate derivative carrying anthraquinone moieties (pMAntrq). This anthraquinone based anode-active material has proven to show a quite good reversible electrochemical reduction behavior in both aqueous and non-aqueous electrolytes in our studies. pMAntrq|1M LiClO4 in EC:DEC=1:1|Li battery system has been constructed. The initial discharge capacity of the cell obtained was 151 mAh/g when cycled between 4.2 and 1.2V at 0.25C rate and 79.2 mAh/g when cycled between 4.0 and 1.5V at 0.3C rate during subsequent cycles.
This material was also used in an aqueous battery, pMAntrq |5M KOH aq.|LiMn2O4 . Although an initial discharge capacity of 37.7 mAh/g was obtained, it deteriorated quickly due to the solubility of the reduced form of the polymer in this electrolyte system. This is the first reported example of such organic-inorganic hybrid battery.
An anode material based on reduced graphene oxide (RGO) functionalized with anthraquinone is also investigated and a battery against Li metal revealed a quite reversible capacity of 200 mAh/g based on the weight of electro-active anthraquinone moieties when cycled between 3.2 and 1.8 V at 0.3C rate. The energy density was found to be around 450 mWh/g.
We have also synthesized and characterized polyacetylene polymers with pendant TEMPO radicals which are electrochemically oxidizable in a reversible manner at around 3.5-3.6V vs. Li. These materials have been proven to be cathode-active materials for rechargeable batteries. We have demonstrated that a mixture of Tempo radical polymer with LiMn2O4 (1:1) can be used as a hybrid cathode material. Typically, this polymer may be expected to act as a polymeric electro-active binder and a stability improver for the inorganic cathode-active material.
Studies toward construction of all organic batteries using these anode and cathode materials are currently in progress.