In order to further develop and adopt electric vehicles for future mobility, it is highly demanded to look for new fast-charging negative electrode materials to replace graphite in Li ion batteries. To find new negative electrode materials that enable quicker charging and discharging operations may require the design of novel compounds utilizing cutting-edge methods.
Transition metal oxides, especially Ti, Nb and W based oxides are drawing a huge attention to be promising candidates as fast-charging negative electrode materials for high power LIBs. Moreover, transition metal oxide, mostly containing edge- and corner-shared (MO6) octahedra have experienced a resurgence lately as fast-charging electrodes for future generation of Li-ion batteries.
Titanium oxide (TiO2) nanoparticles with anatase polymorph were successfully synthesized using sol gel methods from two different precursor material followed by heat treatment. Specific surface area of TiO2(A) obtained by BET analysis was 41 and 44 m2/g from titanium chloride and titanium n-butoxide precursor, respectively. The electrochemistry of as synthesized anatase titanium oxide (TiO2(A)) from two different precursors materials was different. TiO2(A) from titanium chloride precursor shows better electrochemical performance than from titanium-n-butoxide precursor as negative electrode for lithium ion batteries.
Secondly, we synthesized niobium-based oxides, AgNbO3 with perovskite structure. Examination of the perovskite structure with partial substitution with tungsten that has a structure comprising only corner connected (NbO6) octahedra. Tungsten is partially incorporated into the B-site of AgNbO3 perovskite material, and the formula becomes Ag0.9□0.1Nb0.9W0.1O3 and Ag0.8□0.2Nb0.8W0.2O3 (where □ is the vacancy), enabling the insertion of lithium ions. As a result, this research illustrates an alternative strategy to identify new and original insertion materials to investigate alternative electrode materials for fast energy storage applications. This material can be considered as model materials for studying the fast Li+ insertion into host structure.
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