Investigation on the energy storage performance of Cu2Se@MnSe heterojunction hollow spherical shell for aluminum-ion battery

As a new type of secondary battery, aluminum-ion battery has the advantage of low cost and high capacity in the field of energy storage equipment. However, limited by the cathode materials, the capacity and long cycle stability of aluminum-ion battery need to be improved. In this study, Cu2Se@MnSe heterojunction hollow spherical shell was synthesized as the cathode material of aluminum-ion battery, and this new material showed excellent cycle stability: after 3000 cycles, the specific capacity of 114.01 mAh/g was maintained. The hollow spherical shell structure alleviates the volume expansion of selenide in the reaction and avoids material fragmentation. The carbon layer present in heterogeneous spherical shells plays a certain role in supporting the spherical shell structure and limiting the diffusion of active substances. In addition, the built-in electric field generated at the heterojunction interface accelerates the reaction kinetics and improves the ion diffusion rate. In a word, this new heterojunction spherical shell provides a reference for the preparation of aluminum ion battery cathode materials.