Chapter 12 - Polyoxometalate-based metal organic frameworks (POMOFs) for lithium-ion batteries

Abstract

By using fossil fuels emission of CO2 in the atmosphere increases which is the main cause of global warming and most important issue that is in discussion globally. For the utilization of renewable energy resources to meet the energy demand-specific consideration is given to wind, battery power system and solar energy. Polyoxometalates (POMs) are the combination between transition metals in their high oxidation state and oxygen atoms. Most common transition metals are Vanadium, Tungsten, and Molybdenum, etc. POMs are metal oxide complexes due to their properties such as high molecular weight, great thermal stability, nontoxic, easily modified, easily soluble in organic solvents and most important high redox property made them important to use as electrode material in lithium-ion batteries because in traditionally used electrode materials mobility of Lithium ions are less. So, in order to enhance the efficiency of the electrode materials used in lithium-ion batteries, new POMs-based electrode materials have been designed. The cathode material was obtained by mixing POM(Na3[AlMo6O24H6]) with acetylene black have shown theoretical capacity of 455mAhg−1. Three-dimensional (3D) crystalline covalent POMs organic frameworks by the reaction of Anderson-type anionic POMs is modified with ammonium ion with organic moieties tetrakis(4-formyphenyl) silicane or tetrakis(4-formylphenyl) methane (TFPM), and the resulting product was directly used as anode material for lithium-ion battery has shown a high reversible capacity of 550mAhg−1. For rapid Li+ and electron transportation, the fusion of graphene backbone and CNTs builds a highly conductive 3D network for MoS2, and CNTs can successfully inhibit the stacking of graphene nanosheets, providing enormous contact area for electrode material and electrolyte. By having high specific surface areas, diverse composition, and porous architectures characteristics, POM-based metal organic frameworks can be used widely in preparation of MOs-based electrodes. This chapter explores the use of POM and POM-based MOFs in lithium-ion batteries.