Oxygen‐Vacancy‐Abundant Ferrites on N‐Doped Carbon Nanosheets as High‐Performance Li‐Ion Battery Anodes

Abstract

Transition metal oxides, as one of the most promising anode materials for lithium‐ion batteries, often suffer from poor electronic conductivity and serious structural collapse. In this work, oxygen‐vacancy‐abundant CoFe2O4 and NiFe2O4 deposited on N‐doped carbon nanosheets are designed and fabricated through a calcination procedure and a solvothermal strategy using Zn‐hexamine coordination frameworks as precursors. The as‐prepared NC@CoFe2O4 and NC@NiFe2O4 hybrids display improved cycle performances and rate capacities compared with CoFe2O4, NiFe2O4, and Fe2O3. The enhanced lithium storage performances of NC@CoFe2O4 and NC@NiFe2O4 are attributed to the oxygen vacancies and conductive N‐doped carbon nanosheets, which increase the electronic conductivity and electrochemical reaction kinetics. The synthetic process in this work provides a new perspective for designing other high‐performance transition metal oxide anodes.

Morphology and Oxygen Defects Mediated Improved Pseudocapacitive Li+ Storage of Conversion-Based Lithium Iron Oxide

“…The major difference in both samples is the amount of oxygen defects. Thus, the improved conductivity of the nanofiber-based sample is attributed to the presence of a higher number of oxygen defects. ,, …”

“…Thus, the improved conductivity of the nanofiber-based sample is attributed to the presence of a higher number of oxygen defects. 15,25,37…”

Three‐Dimensional Porous Diboron Dinitride as a High‐Performance Anode Material for Sodium/Potassium‐Ion Batteries: A First Principles Study

“…Lately, the rational design of 3D porous materials is deemed as an efficient strategy to boost the physicochemical property of 2D counterparts, including mass density, electronic structure and mechanical stiffness. [32][33][34][35] Despite the considerable progress in 3D carbon materials and MXenes, [36][37][38][39][40] the research of porous 3DÀ BN is still in the early stage. [41] Hence, an interesting question is proposed naturally: could we design an appealing porous 3DÀ BN anode for advanced SIBs/PIBs?…”

Half‐Metallic PN2 Monolayer as High‐performance Anode Material for Metal Ion (Li, Na and K) Batteries: A First‐Principles Study

“…[1] Among various energy storage systems, rechargeable lithium-ion batteries (LIBs) stand out because of their good reversible capacity, excellent cyclability, and high energy density. [2][3][4][5][6][7][8][9] Nonetheless, the practical applications of LIBs are severely impeded by the poor rate capability and low capacity. Moreover, the low natural abundance and uneven distribution of Li resource is another obstacle in the large-scale development of LIBs.…”