Metal–Organic Frameworks Derived Okra-like SnO₂ Encapsulated in Nitrogen-Doped Graphene for Lithium Ion Battery

Abstract

A facile process is developed to prepare SnO-based composites through using metal-organic frameworks (MOFs) as precursors. The nitrogen-doped graphene wrapped okra-like SnO composites (SnO@N-RGO) are successfully synthesized for the first time by using Sn-based metal-organic frameworks (Sn-MOF) as precursors. When utilized as an anode material for lithium-ion batteries, the SnO@N-RGO composites possess a remarkably superior reversible capacity of 1041 mA h g at a constant current of 200 mA g after 180 charge-discharge processes and excellent rate capability. The excellent performance can be primarily ascribed to the unique structure of 1D okra-like SnO in SnO@N-RGO which are actually composed of a great number of SnO primary crystallites and numerous well-defined internal voids, can effectively alleviate the huge volume change of SnO, and facilitate the transport and storage of lithium ions. Besides, the structural stability acquires further improvement when the okra-like SnO are wrapped by N-doped graphene. Similarly, this synthetic strategy can be employed to synthesize other high-capacity metal-oxide-based composites starting from various metal-organic frameworks, exhibiting promising application in novel electrode material field of lithium-ion batteries.

Metal‐Organic Framework‐Derived Carbons for Battery Applications

“…[90] When NG/Fe-Fe 3 C was utilized as an anode for LIBs, it displayed a high discharge capacity of 1098 mAh g −1 at 100 mA g −1 . [96] Copyright 2017, American Chemical Society. [91] The Cu-MONFs was prepared using aspartic acid as a ligand.…”

“…[95] The introduction of the highly conductive NC creates a 3D backbone to facilitate charge transfer. [96] The Sn-based MOF was obtained via a simple wet-chemical method. [96] The Sn-based MOF was obtained via a simple wet-chemical method.…”

SnO2 as Advanced Anode of Alkali‐Ion Batteries: Inhibiting Sn Coarsening by Crafting Robust Physical Barriers, Void Boundaries, and Heterophase Interfaces for Superior Electrochemical Reaction Reversibility

“…Another preparation method is to directly wrap Gr on prefabricated SnO 2 NPs . The wrapped Gr layers act as an electrolyte barrier that stabilizes the SEI layer and a conductive reinforcement to facilitate electron transfer . SnO 2 /RGO nanocomposites can also be easily fabricated by ball‐milling metallic Sn and GO.…”

Mn2O3/ErGO Nanocomposites for Supercapacitor Electrodes

“…With the development of the portable electronics and depletion of fossil fuels, energy storage and conversion device such as supercapacitors (SCs) [1][2][3], lithium-ion batteries (LIBs) [4] and fuel cells (FCs) [5] have received much attention. Among them, SCs, also known as ultracapacitors or electrochemical capacitors, are considered as promising candidates for energy storage which exhibit high power density, fast charge and discharge rates and long cycle life [6].…”