Research progress in flexible Zn-ion batteries for wearable sensor

The applications of wearable sensors in sports， medicine， rehabilitation， and other fields， have greatly facilitated the capture and monitoring of human movement index signals effectively avoiding sports injuries， reducing the frequency of medical treatment， and even saving many lives. With the application and popularization of wearable sensors， suitable flexible energy supply systems are the key to its development. In recent years， researchers have studied and designed a variety of flexible energy supply systems based on different energy release methods， among which flexible Zn-ion batteries stand out due to their high energy density， high elastic modulus， high cycle stability， and high safety. We reviewed the research progress in flexible Zn-ion batteries for wearable sensors， mainly introducing and summarizing the batteries components （such as current collector， electrode （cathode and anode）， separator， electrolyte， and packaging） and the application of wearable sensors. Finally， the current problems and challenges of flexible Zn-ion batteries are discussed.