Abstract
Owing to severe agglomeration of manganese carbonate(MnCO3)during its synthesis,it exhibits rapid decay cycle performance when used as a cathode material in aqueous zinc ion batteries.To overcome this drawback,we synthesized a MnCO3 material with carbon nanotubes(CNTs)(i.e.,MnCO3@CNTs)via a one-step solvothermal method using a hybrid modification strategy.MnCO3 nanospheres were grown in-situ on a two-dimensional(2D)plane that was orderly interwoven by tubular single fibers of carbon to form a leaf-like nanosheet structure.The surface area of the MnCO3@CNTs material was enlarged enormously through the special nanosheet structure,and its stability was improved by the supporting structure of the CNTs.As a result,the MnCO3@CNTs exhibited a discharge capacity of 247.6 mAh g-1 at a current density of 0.1 A g-1.The energy storage mechanism of MnCO3@CNTs was further explored using a series of electrochemical kinetic analyses and ex-situ characterization tests.This modification method not only broadens the application field of MnCO3,but also provides the possibility of modifying more cathode materials.
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