Ammonium Metatungstate in Lithium-Ion Batteries

Ammonium metatungstate (AMT) is a crucial precursor for preparing tungsten trioxide (WO₃), which is widely studied as an anode material for lithium-ion batteries due to its high theoretical capacity (693 mAh/g) and excellent chemical stability. Compared to traditional graphite anodes, WO₃ offers higher energy density and cycle stability.

By coating carbon-based materials such as carbon nanotubes (CNTs) or graphene with an AMT solution, the resulting WO₃ composite electrodes exhibit significant performance improvements. Studies show that this composite structure effectively mitigates volume expansion issues of WO₃ during charge-discharge cycles, increasing cycle life by approximately 50%. Additionally, nanoscale WO₃ particles (20-50 nm) prepared from AMT, with their high specific surface area, significantly enhance lithium-ion diffusion rates and electrode reaction activity.