Controllable construction of core–shell CuCo2S4@polypyrrole nanocomposites as advanced anode materials for high-performance sodium ion half/full batteries

Core–shell CuCo₂S₄@polypyrrole (CS-CuCo₂S₄@PPy) nanocomposites, as advanced anode materials for sodium ion batteries with outstanding cycling stability and rate capability, were prepared by a facile solvothermal strategy and subsequent in-situ chemical oxidation polymerization.