Yolk-shelled ZnO NiO microspheres derived from tetracyanide-metallic-frameworks as bifunctional electrodes for high-performance lithium-ion batteries and supercapacitors

Design and Synthesis of CoP/r-GO Hierarchical Architecture: Dominated Pseudocapacitance, Fasted Kinetics Features, and Li-Ion Capacitor Applications

“…For LICs, recent studies have shown that many kinds of LICs using carbon-based materials, insertion materials and beyond intercalation type materials as cathode have been developed. − On the other back, the anode electrode material is mainly a crystal material that is connected by metal bonds, ionic bonds, and covalent bonds, for instance, transition metal oxides, phosphides, sulfides, nitrides, carbides, etc. According to the research, a series of oxides electrode materials are attracting much interest with excellent electrochemical performance in place of traditional carbonaceous anode that shows limited theoretical capacity of 372 mAh g –1 , such as Co 3 O 4 , CuO, , Mn 3 O 4 , Sb 2 O 3 , ZnO, NiO, MnO, SnO 2 , , TiO 2 ,etc. However, oxides are unable to provide excellent cycle performance and rapid electrochemical kinetics on account of inferior conductivity.…”

Stabilized Coralloid‐like CoP with N,P‐Codoped Carbon Shell on Carbon Paper for Enhanced Sodium Storage

“…The large irreversible cathodic peak at 0.6 V in the first cycling is from forming solid electrolyte interface (SEI) film involving an irreversible electrochemical reaction. [41,42] In the next several cycling, this cathodic peak shifts to nearby 1.0 V, resulting from the electrochemical reconstitution of active material. The broad peak that appeared between 1.8-2.2 V is attributed to the Na + extraction from Na 3 P. [8,43] The almost overlayed CV curves from 2 to 5 cycling confirm the reversible electrochemical reaction in CoP@NPC/CP after the SEI films formation.…”

“…There is an apparent electrochemical behavior difference between the first cycling and subsequent cycling. The large irreversible cathodic peak at 0.6 V in the first cycling is from forming solid electrolyte interface (SEI) film involving an irreversible electrochemical reaction [41,42] . In the next several cycling, this cathodic peak shifts to nearby 1.0 V, resulting from the electrochemical reconstitution of active material.…”

Porous Multicomponent Mn–Sn–Co Oxide Microspheres as Anodes for High-Performance Lithium-Ion Batteries

“…22,23 Among the numerous electrode materials for anodes, metal oxides are expected to be a promising anode material for replacing graphite because of their high theoretical capacity and good electrochemical properties. 24−26 In particular, binary metal oxides including cobalt or manganese have been constantly studied as anodes for next-generation LIBs because of their high theoretical capacity, low cost, low discharge plateau (0.3–0.6 V), and synergistic effects. 27−29 Yang’s group reported CoMn 2 O 4 nanofibers via an electrospinning method combined with heat treatment, showing a reversible capacity of 526 mA h g –1 at 400 mA g –1 after 50 cycles.…”

“…Recently, with the increasing attention on clean energy and more demand for high energy density of various portable devices and electric vehicles, green energy storage and conversion devices, such as lithium-ion batteries (LIBs), − fuel cells, − and supercapacitors, − have been widely studied and applied. Among them, LIBs have been attracting researchers’ interests because of their high capacity and long cycle life. − In current commercial LIBs, graphite has been used as a classic anode material because of its excellent cycle performance and low charging/discharging potential. , However, the disadvantage of its low capacity density limits its wide application in high-performance LIBs. , Therefore, the search for a new generation of electrode materials with higher energy density and excellent cycle stability has become a top priority. , Among the numerous electrode materials for anodes, metal oxides are expected to be a promising anode material for replacing graphite because of their high theoretical capacity and good electrochemical properties. − In particular, binary metal oxides including cobalt or manganese have been constantly studied as anodes for next-generation LIBs because of their high theoretical capacity, low cost, low discharge plateau (0.3–0.6 V), and synergistic effects. − Yang’s group reported CoMn 2 O 4 nanofibers via an electrospinning method combined with heat treatment, showing a reversible capacity of 526 mA h g –1 at 400 mA g –1 after 50 cycles . Mesoporous NiCo 2 O 4 microspheres synthesized by a facile solvothermal method with pyrolysis could deliver 1198 mA h g –1 after 30 cycles at 200 mA g –1 .…”