Yolk‐Shell Structured C/Mn₃O₄ Microspheres Derived from Metal–Organic Frameworks with Enhanced Lithium Storage Performance

Abstract

To solve the problem associated with the huge volume change and low conductivity of Mn3O4, a novel C/Mn3O4 microsphere with Mn3O4 layer and void space sandwiched by nitrogen‐doped carbon (NC) is designed and fabricated. In this composite, the NC is obtained from the metal–organic frameworks (MOFs) and polydopamine (PDA). The preparation process is facile and effective without additional templates or redox solvents introduced. When used as anodes for lithium‐ion batteries (LIBs), the C/Mn3O4 composite incorporates the metrics of N‐doping, yolk‐shell structure, double carbon layer, mesoporous Mn3O4, showing an outstanding lithium storage of ≈1015.9 mAh g−1 at 0.2 A g−1 in the 250th cycle, high cycling stability (without clear capacity decay after 400 cycles), and excellent rate capability (capacity can fully recover as the current density returns back to the initial value of 0.2 A g−1). The yolk‐shell structure derived from MOFs can be expanded to fabricate other materials with improved performance.

Recent Progress in MOF‐Derived Porous Materials as Electrodes for High‐Performance Lithium‐Ion Batteries

“…Xu and his group prepared C/Mn 3 O 4 nanospheres with core–shell structure by hydrothermal method and heat treatment. [ 105 ] Since the shell may prevent active material aggregation and increase cycle performance, the internal void can be employed as a buffer area to adapt volume expansion and stabilize the structure. [ 106 ] Meanwhile, Mn 3 O 4 and NC's synergistic action can boost electrochemical performance.…”