Dual Electrostatic Assembly of Graphene Encapsulated Nanosheet‐Assembled ZnO‐Mn‐C Hollow Microspheres as a Lithium Ion Battery Anode

Abstract

Graphene encapsulated nanosheet-assembled ZnO-Mn-C hierarchical hollow microspheres are produced through a simple yet effective dual electrostatic assembly strategy, followed by a heating treatment in inert atmosphere. The modification of graphene sheets, metal Mn, and in situ carbon leads to form 3D interconnected conductive framework as electron highways. The hollow structure and the open configuration of hierarchical microspheres guarantee good structural stability and rapid ionic transport. More importantly, according to the density functional theory calculations, the oxygen vacancies in the hierarchical microspheres would cause an imbalanced charge distribution and thus the formation of local in-plane electric fields around oxygen vacancy sites, which is beneficial for the ionic/electronic transport during cycling. Due to this multiscale coordinated design, the as-fabricated graphene encapsulated nanosheet-assembled ZnO-Mn-C hierarchical hollow microspheres demonstrate good lithium storage properties in terms of high reversible capacity (1094 mA h g −1 at 100 mA g −1 ), outstanding high-rate long-term cycling stability (843 mA h g −1 after 1000 cycles at 2000 mA g −1 ), and remarkable rate capability (422 mA h g −1 after total 1600 cycles at 5000 mA g −1 ).

High Initial Reversible Capacity and Long Life of Ternary SnO2-Co-carbon Nanocomposite Anodes for Lithium-Ion Batteries

“…S8b. This extraordinary rate capability of N-u-SCC-2 was not due to its unique nanostructure consisting only of Co and carbon framework, but can be attributed to the oxygen vacancies, which improved the conductivity and transportation of Li + [28,31,[35][36][37][38][39][40]. The N-u-SCC-2 electrode exhibited a cycling life of up to 450 cycles and maintained a reversible capacity of ~ 760 mAh g −1 at the current density of 0.5 A g −1 , as shown in Fig.…”

Engineering oxygen vacancies in hierarchically Li-rich layered oxide porous microspheres for high-rate lithium ion battery cathode

“…But their results still showed poor cycle and rate performances. In addition, oxygen defects were created in the electrode materials to facilitate Li + diffusion [21,22]. However, the poor rate capability and rigorous experimental conditions both urge us to seek better strategies.…”

Synergistical Coupling Interconnected ZnS/SnS2 Nanoboxes with Polypyrrole‐Derived N/S Dual‐Doped Carbon for Boosting High‐Performance Sodium Storage

“…To address these issues, combining binary metal chalcogenides with hierarchical nanostructure has explored into a newly developing strategy . It is well known that constructing a heterogeneous composite can improve the electric conductivity and charge transfer induced by the internal electric field . Therefore, fabricating a novel heterogeneous composite consisting of two alloying materials is a promising method to achieve high‐performance SIB anodes .…”