Construction of electrical “highway” to significantly enhance the redox kinetics of normal hierarchical structured materials of MnO

Abstract

The inserted and cross-linked HCNFs in the MnO/HCNFs composites act like electrical “highways” through which electrons/Li ions are directly transferred to the inner parts of the MnO microspheres without obstruction.

Pseudocapacitive Lithium Storage of Cauliflower‐Like CoFe2O4 for Low‐Temperature Battery Operation

“…Zhang and co‐workers prepared 2D Fe 2 O 3 nanosheets with bi‐continuous pores (bp‐Fe 2 O 3 ) which showed a high capacity of 818.7 mAh g −1 at 1.5 A g −1 [12] . A remarkable capacity of 206.3 mAh g −1 at 6.4 A g −1 was achieved for micro–nano‐MnO material, as reported by Zhang et al [13] . These findings inspire us to explore a facile approach to develop microscale CoFe 2 O 4 constructed by nanoscale particles as a potential anode material for LIBs.…”

Hierarchical MnO@C Hollow Nanospheres for Advanced Lithium-Ion Battery Anodes

“…To address these issues, a variety of MnO nanomaterials adopting hollow structures , or hierarchical structures consisting of primary building blocks ,,− have been fabricated and used as anode materials for LIBs, which showed improved cycling performance and rate capability. It is noteworthy that 2D nanomaterials including nanosheets, nanoplates, and nanoflakes have attracted particular attention on account of their beneficial properties, such as enhanced active surface area, shortened ion diffusion pathways, and better accommodation of the volume changes. , Therefore, hierarchical hollow structures made of ultrathin 2D nanosheets would be an attractive structure for LIB electrode materials since they combine both merits of the hollow structures for alleviating volume expansion and the 2D nanoscale building blocks for enhanced surface areas and shortened transport length of ions.…”

Construction of Rich Conductive Pathways from Bottom to Top: A Highly Efficient Charge‐Transfer System Used in Durable Li/Na‐Ion Batteries at −20 °C

“…Generally, the b value between 0.5 and 1.0 implies that the double mechanisms emerge simultaneously during the charge‐storage process . The calculated b value (Figure B) for the oxide peaks in the α‐MnS/@ N ‐C/FG composite is 0.83, indicating a favored pseudocapacitive effect of α‐MnS@ N ‐C/FG.…”

“…Generally,t he bv alue between 0.5 and 1.0 implies that the double mechanismse merges imultaneously during the chargestoragep rocess. [10,23] The calculated bv alue ( Figure 6B)f or the oxide peaks in the a-MnS/@N-C/FG composite is 0.83, indicating af avoredp seudocapacitive effecto fa-MnS@N-C/FG. The ratio of pseudocapacitive contribution is calculated by separating the current (i)a tafixed potential V into surface-controlled pseudocapacitive effects (k 1 v)a nd diffusion-controllede lectrochemicalr eactions (k 2 v 1/2 ) [24] [Eq.…”