Despite their excellent electrical and mechanical properties, silver nanowires (AgNWs) are often limited by electrochemical corrosion when used directly in stretchable and wearable energy storage. On the other hand, the electrodes of stretchable energy storage devices are mostly conductive energy storage materials designed as stretchable structures or combined with elastic substrates or relied on conductive polymers. The complex structural design often leads to low specific capacity. Herewith, we designed a coaxial Ni-AgNWs embedded into thermoplastic polyurethane (Ni-AgNWs@TPU) as a stretchable current collector, which effectively protects the AgNWs network by electrodeposition of a nickel layer. We demonstrated a simple activated carbon (A.C.) slurry loading on Ni-AgNWs@TPU stretchable collector, stretchable electrodes with a loading of 25 mg·cm^–2 can be obtained with triethyl phosphate (TEP) as the solvent for A.C. preparation. The stretchable supercapacitors assembled with the gel electrolyte have a high areal capacitance of 489 mF·cm^–2 and are cycled 5000 times at 5 mA·cm^–2 with a capacity retention rate of 92.96%. An excellent capacity retention of 92.77% at a maximum strain of 80% and almost no capacity degradation at 60% strain for 6000 stretch/release cycles evidenced superior mechanical stability.

Among various metal oxide nanomaterials, manganese oxides, which can exist in different structures and valence states, are considered highly promising anode materials for lithium-ion batteries (LIBs). However, conventional manganese oxides, such as MnO and MnO₂, face significant challenges during cycling process. Specifically, poor electronic conductivity and large volume changes result in low specific capacity during high current charging and discharging, as well as poor fast-charging performance. This work presents an approach to synthesizing porous hexagonal Mn₅O₈ nanosheets via hydrothermal and annealing methods and applies them as anode materials for LIBs. The Mn₅O₈ nanomaterials exhibit a thin plate morphology, which effectively reduces the distance for ion/electron transmission and mitigates the phenomenon of volume expansion. Additionally, the large pore size of Mn₅O₈ results in abundant interlayer and intralayer defects, which further increase the rate of ion transmission. These unique characteristics enable Mn₅O₈ to demonstrate excellent electrochemical performance (938.7 mAh·g⁻¹ after 100 cycles at 100 mA·g⁻¹) and fast charging performance (675.7 mAh·g⁻¹ after 1000 cycles at 3000 mA·g⁻¹), suggesting that Mn₅O₈ nanosheets have the potential to be an ideal fast-charging anode material for LIBs.