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In the fast-developing world, people must migrate to hybrid electric vehicles with a high energy density of lithium-ion batteries to reduce air and sound pollution primarily. Herein, acid hydrolysis is used to depolymerize vest post-consumer polyethylene terephthalate (PET) bottles, resulting in pure terephthalic acid (TPA). It was used in an acid-base reaction to produce the dilithium terephthalate (Li 2 TP). By using 1 H, 13 CNMR, and FTIR spectroscopy, the obtained TPA and its salt Li 2 TP are thoroughly studied. In terms of electrochemical properties, TPA has a restricted reversible capacity of 102 mAh g À 1 with dramatic fading and a coulombic efficiency of 98.2 % over the 50th cycle at 1 C. The resulting Li 2 TP, displays a three-fold higher reversible capacity of 295 mAh g À 1 , with 99.8 % capacity retention and stable cycling at a similar rate over the 50th cycle. Moreover, computationally found that the charged state of Li 2 TP has a highly unstable structure due to a high steric hindrance and strong similar charge repulsion between lithium ions and it shows bandgap energy 0.2318 eV with four ionic bonds (1.7748 Å) and two new metallic bonds (3.2114 Å), which is 22 times smaller than TPA. Furthermore, Li 2 TP has a lower dielectric constant/loss and higher dipole movement than TPA, with values of 1.32E + 04/1.24E + 03, and 5.93E + 03 respectively, and it improves Li-ion transportation of Li 2 TP in organic electrolytes.

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The versatile property of the Keggin type POM is the multi-electron transfer that happens during the switching between [PMo10V2O40]5− to [PMo10V2O40]27−. This tunable behavior makes it unique, efficient material as a cathode for Na-ion batteries.

The tavorite-structured materials remain unfathomed as positive electrodes in rechargeable batteries. Reasoning of this fact, borate, and silicate-based tavorites are investigated for utilization in Li-ion batteries (LIBs) and as a photocatalyst for organic contaminant degradation. The physiochemical, electrochemical, dielectric, and photoelectrochemical properties are analyzed to learn the fact that LiVBO 4 F has resulted in a glass-ceramic nature owing to the embodiment of boron oxyfluoride glasses. This nature has made them effective as cathodes even under sensitive mode operations compared to their counterpart. Additionally, a multiredox behaviour was witnessed for both the materials, which boosts the specific capacity for LIB system. Besides, LiVSiO 4 F display immense degradation efficiency for tetracycline, an organic contaminant. These materials unveil expedient properties, promising its multiple usage in the field of conversion cum storage devices as photoelectrodes and cathodes in LIBs. K E Y W O R D Scathode, dielectric, glass-ceramics, Li-ion battery, photocatalyst, tavorite

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