Ammonium metatungstate (AMT) is a crucial precursor for preparing tungsten trioxide (WO?), 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, WO? 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 WO? composite electrodes exhibit significant performance improvements. Studies show that this composite structure effectively mitigates volume expansion issues of WO? during charge-discharge cycles, increasing cycle life by approximately 50%. Additionally, nanoscale WO? particles (20-50 nm) prepared from AMT, with their high specific surface area, significantly enhance lithium-ion diffusion rates and electrode reaction activity.