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Designed hybrid nanostructure with catalytic effect: beyond the theoretical capacity of SnO2 anode material for lithium ion batteries.

Abstract：

:Transition metal cobalt (Co) nanoparticle was designed as catalyst to promote the conversion reaction of Sn to SnO2 during the delithiation process which is deemed as an irreversible reaction. The designed nanocomposite, named as SnO2/Co3O4/reduced-graphene-oxide (rGO), was synthesized by a simple two-step method composed of hydrothermal (1(st) step) and solvothermal (2(nd) step) synthesis processes. Compared to the pristine SnO2/rGO and SnO2/Co3O4 electrodes, SnO2/Co3O4/rGO nanocomposites exhibit significantly enhanced electrochemical performance as the anode material of lithium-ion batteries (LIBs). The SnO2/Co3O4/rGO nanocomposites can deliver high specific capacities of 1038 and 712 mAh g(-1) at the current densities of 100 and 1000 mA g(-1), respectively. In addition, the SnO2/Co3O4/rGO nanocomposites also exhibit 641 mAh g(-1) at a high current density of 1000 mA g(-1) after 900 cycles, indicating an ultra-long cycling stability under high current density. Through ex-situ TEM analysis, the excellent electrochemical performance was attributed to the catalytic effect of Co nanoparticles to promote the conversion of Sn to SnO2 and the decomposition of Li2O during the delithiation process. Based on the results, herein we propose a new method in employing the catalyst to increase the capacity of alloying-dealloying type anode material to beyond its theoretical value and enhance the electrochemical performance.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang Y,Huang ZX,Shi Y,Wong JI,Ding M,Yang HY

doi

10.1038/srep09164

subject

Has Abstract

pub_date

2015-03-17 00:00:00

pages

9164

issn

2045-2322

pii

srep09164

journal_volume

5

pub_type

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