Hexagonal boron nitride (h-BN) has emerged as a strong candidate for twodimensional (2D) material owing to its exciting optoelectrical properties combined with mechanical robustness, thermal stability, and chemical inertness. Super-thin h-BN layers have gained significant attention from the scientific community for many applications, including nanoelectronics, photonics, biomedical, anti-corrosion, and catalysis, among others. This review provides a systematic elaboration of the structural, electrical, mechanical, optical, and thermal properties of h-BN followed by a comprehensive account of stateof-the-art synthesis strategies for 2D h-BN, including chemical exfoliation, chemical, and physical vapor deposition, and other methods that have been successfully developed in recent years. It further elaborates a wide variety of processing routes developed for doping, substitution, functionalization, and combination with other materials to form heterostructures. Based on the extraordinary properties and thermal-mechanical-chemical stability of 2D h-BN, various potential applications of these structures are described.The ORCID identification number(s) for the author(s) of this article can be found under

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A first attempt has been made to prepare Li 3 M x V 22x (PO 4 ) 3 /C (M=Fe, Co) composite solutions by adopting a novel oxalic dihyrazide assisted combustion (ODHAC) method. The pillaring effect of Fe in Li 3 Fe x V 22x (PO 4 ) 3 /C and the possible electrochemical activity of the Co 3+/4+ redox couple of Li 3 Co x V 22x (PO 4 ) 3 /C at a 4.8 V limit increases the structural and cycling stability of the native Li 3 V 2 (PO 4 ) 3 /C cathode respectively, thereby ultimately improving the electrochemical behaviour of Li 3 M x V 22x (PO 4 ) 3 /C solid solutions. An extended solubility limit of x = 0.10 for Fe dopant has been achieved for the first time through the present study against the reported value of x = 0.05 in Li 3 Fe x V 22x (PO 4 ) 3 /C compounds. The study demonstrates the suitability of the ODHAC synthesis approach in preparing a wide variety of phase pure Li 3 M x V 22x (PO 4 ) 3 /C cathodes. Further, the superiority of Li 3 Co 0.10 V 1.90 (PO 4 ) 3 /C in exhibiting the highest capacity (178 mAh g 21) and negligible fade (4%) and the demonstrated cyclability under the influence of 10 C rate has been understood as a function of the synergistic effect of the ODHAC synthesis method and the optimum concentration of Co dopant chosen for the study.

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