Lithium/potassium storage performance analysis of carbon composites based on rice husk cellulose and peony-like ZnO

Inspired by the structure of peony flower, a nanostructured peony-like ZnO was bionically designed. This bionic structure has larger specific surface area and lamellar spacing, which provides more active sites for ion storage, and the combination with natural biomass rice husk carbon can effectively alleviate volume expansion, improve conductivity, and perform excellent cycle performance and rate performance in the battery. After 100 cycles at 0.2 C rate, the discharge specific capacity of this composite structure in LIB reaches 819.9 mAh g −1 . At the current density of 139.5 mAh g −1 , the reversible capacity in PIB reached 119 mAh g −1 after 50 cycles, and the capacity was stable at 91.9 mAh g −1 after 100 cycles.