Abstract
AbstractThe potassium‐ion battery (PIB) is regarded as a promising energy storage system to replace lithium‐ion battery, while the sluggish kinetics and large K+ size result in inferior rate performance and poor cycle stability, impeding its extensive development. Here, a carbon coated VO2/V2O3 nanoparticles (VO2/V2O3@C) was prepared by simple reflux and pyrolysis process with polyaniline as the carbon source. The C−O−V bond and the oxygen vacancy within VO2/V2O3@C can not only accelerate the charge transfer between carbon and VO2/V2O3 nanoparticles, but also increase the active sites. Therefore, VO2/V2O3@C as an anode for PIB exhibits an excellent rate (78 mAh g−1 at 0.5 A g−1) and long‐cycling performance (147.9 mAh g−1 at 50 mA g−1 after 1000 cycles), and the full cell PIB shows high power density and energy density as well. This work provides a pathway to design other high‐performance anodes for PIBs.
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