Electroactive six arm star poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate): Synthesis and application as cathode material for rechargeable Li-ion batteries

In this report, we described organic radical batteries (ORBs) based on a newly synthesized star polymer. Six arm star polymer in which the polymer chains radiating from an electroactive triphenylamine core and the chains containing 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) pendant groups was designed and synthesized via core first method using ATRP technique. The molecular weight (Mn) and polydispersity index of the star poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate) (star PTMA) obtained was 6.8 × 104 g mol−1 and 1.08 respectively. The cathode composite materials comprised of star PTMA with SP carbon were prepared and successfully used in rechargeable batteries against lithium metal anode. The cyclic voltammetry results of star PTMA exhibited reversible redox peak pair distinctly at 3.61 V and 2.88 V (vs. Li/Li+) attributed to the electrochemical redox behavior of the nitroxide radicals and triphenylamine moieties respectively. The batteries fabricated with 40% and 20% star PTMA (active material) showed initial specific energy capacity of 115.2 mWh/g and 72.6 mWh/g respectively and the batteries retained 95% of its energy capacity after 10th charge/discharge cycle. The initial charge/discharge capacities of the cell containing 40% active material were found high compared to that containing 20% active material; however, both the cells exhibited similar discharge capacity.Graphical abstractIn this work, we described a star polymer bearing TEMPO and a...
Source: Polymer - Category: Chemistry Source Type: research
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