Amorphous H0.82MoO3.26 cathodes based long cyclelife fiber-shaped Zn-ion battery for wearable sensors

The conductivity and structural intrinsic stability of cathode materials are the barriers to achieve high-performance fiber-shaped Zn-ion batteries (FZIBs). Here, amorphous H 0.82 MoO 3.26 coated on carbon nanotubes fiber (noted as CHMO) is exploited as cathode materials for aqueous FZIBs with high energy density , excellent cycle stability and good omnidirectional flexibility. The amorphous H 0.82 MoO 3.26 improves electron transfer and accelerates electrochemical reaction kinetic, as well as effectively suppresses structural degradation during repeated charge/discharge process. Meanwhile, the electrochemical behaviors combined with a series of in-situ/ex-situ characterizations verify that Zn 2+ and H + ions insert/extract into/from the CHMO fiber reversibly at the same time. The assembled battery delivers high energy density of 32.1 mWh cm -3 (based on the volume of cathode) and excellent capacity retention of about 67% after 5000 cycles at 700 mA cm -3 , as well as splendid flexibility (about 91% capacity retention after bending 3500 times). Wearable NO 2 gas sensor and pressure sensor integrated with fiber-shaped Zn//CHMO battery are also fabricated, which can operate stably with stable signal output.