Interfacial Superassembly of Grape-Like MnO–Ni@C Frameworks for Superior Lithium Storage

Abstract

Despite the excellent electrochemical performance of MnO-based electrodes, a large capacity increase cannot be avoided during long-life cycling, which makes it difficult to seek out appropriate cathode materials to match for commercial applications. In this work, a grape-like MnO−Ni@C framework from interfacial superassembly with remarkable electrochemical properties was fabricated as anode materials for lithium-ion batteries. Electrochemical analysis indicates that the introduction of Ni not only contributes to the excellent rate capability and high specific capacity but also prevents further oxidation of MnO to the higher valence states for ultrastable long-life cycling performance. Furthermore, thermodynamic calculation proves that the ultrastable long cycling life of the Ni−Mn−O system originated from a buffer composition region to stabilize the MnO structure. Because of the unique grape-like structure and performance of the Ni−Mn−O system, the MnO−Ni@C electrode displayed an invertible specific capacity of 706 mA h g −1 after 200 cycles at a current density of 0.1 A g −1 and excellent cycling stability maintained a capacity of 476.8 mA h g −1 after 2100 cycles at 1.0 A g −1 without obvious capacity change. This new nanocomposite material could offer a novel fabrication strategy and insight for MnO-based materials and other metal oxides as anodes for improved electrochemical performance.

Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

“…coordinated catalysts are promising substitutes because of the synergistic effects originating from abundant chemical defects and maximized catalytic active sites. [17][18][19] Some works have demonstrated that Co or Fe nanocrystal anchored N doped carbon nanocomposites containing both M (M=Co, Fe) and M-N-C high active sites exhibited a superior electrocatalytic performance in non-noble metal catalyst for energy storage and electrochemical conversion. [20,21] Compared with precious metal catalysts, the durability of these M/M-N-C catalysts cannot satisfy the needs of long-time cycles.…”

Co3O4 nanoparticle-dotted hierarchical-assembled carbon nanosheet framework catalysts with the formation/decomposition mechanisms of Li2O2 for smart lithium–oxygen batteries

“…The D band peak (structural defects in the graphitic structure) and G band peak (in-plane vibration of sp 2 amorphous carbon) were measured from the catalysts at 1338 cm −1 and 1585 cm −1 . 63,64 The intensity ratio of I D /I G was calculated as ca. Correspondingly, Co 3 O 4 -HCNF illustrated the mesopores with a pore diameter of about 12.68 nm (inset in Fig.…”

Nano-synergy enables highly reversible storage of 9.2 wt% hydrogen at mild conditions with lithium borohydride

“…The black nanoparticles display fringes with an interplanar spacing of 0.204 nm, which can be assigned to the (111) lattice spacing of metallic Ni (Fig. 3d) [41]. Moreover, the HRTEM images also manifest the close contact and even overlapping between Ni nanoparticles and the LiBH4 particles.…”