Carbon-based quantum dots/nanodots materials for potassium ion storage

With the rapid development of electric vehicles, hybrid electric vehicles and smart grids, people's demand for large-scale energy storage devices is increasingly intense. As a new type of secondary battery, potassium ion battery is promising to replace the lithium-ion battery in the field of large-scale energy storage by virtue of its low price and environmental friendliness. At present, the research on the anode materials of potassium ion batteries mainly focuses on carbon materials and the design of various nanostructured metal-based materials. Problems such as poor rate performance and inferior cycle life caused by electrode structure comminution during charge and discharge have not been solved. Quantum dots/nanodots materials are a new type of nanomaterials that can effectively improve the utilization of electrode materials and reduce production costs. In addition, quantum dots/nanodots materials can enhance the electrode reaction kinetics, reduce the stress generated in cycling, and effectively alleviate the agglomeration and crushing of electrode materials. In this review, we will systematically introduce the synthesis methods, K+ storage properties and K+ storage mechanisms of carbon quantum dots and carbon-based transition metal compound quantum dots composites. This review will have significant references for potassium ion battery researchers.