当前位置:文档之家 > Core–shell structured hollow SnO2–polypyrrole nanocomposite anodes with enhanced cyclic performanc

Core–shell structured hollow SnO2–polypyrrole nanocomposite anodes with enhanced cyclic performanc

Core–shell structured hollow SnO2–polypyrrole nanocomposite anodes with enhanced cyclic performanc

Core–shell structured hollow SnO2–polypyrrole nanocomposite anodes with enhanced cyclic performanc

journal homepage: http://www.doczj.com/doc/0e3768986bd97f192279e9c7.html /locate/nanoenergy

Available online at http://www.doczj.com/doc/0e3768986bd97f192279e9c7.html

RAPID COMMUNICATION

Core–shell structured hollow

SnO2–polypyrrole nanocomposite

anodes with enhanced cyclic performance

for lithium-ion batteries

Ruiqing Liu a,Deyu Li a,Chen Wang a,Ning Li a,n,Qing Li b,n,

Xujie Lüb,Jacob S.Spendelow b,Gang Wu b,n

a School of Chemical Engineering&Technology,Harbin Institute of Technology,Harbin150001,China

b Materials Physics and Applications Division,Los Alamos National Laboratory,Los Alamos,NM87545,

United States

Received18January2014;received in revised form6March2014;accepted13March2014

Available online27March2014

KEYWORDS

SnO2nanoparticles;

Polypyrrole;

Hollow morphology;

Anodes;

Lithium ion batteries

Abstract

Core–shell structured hollow SnO2–polypyrrole(PPy)nanocomposites(SnO2@PPy)with excellent

electrochemical performance were synthesized using a hydrothermal method followed by an

in situ chemical-polymerization route.The thickness of the polymerized amorphous PPy coating

covering on the hollow SnO2microspheres is about25nm,demonstrated by microscopy images.

As an anode in lithium ion batteries,the nanocomposite is capable of retaining a high capacity

of448.4mAh gÀ1after100cycles with a coulomb efficiency above97%.Compared to other

reported SnO2anodes,the enhanced cycling stability is attributed to the unique core–shell

structure and a possible synergistic effect between the PPy coating layer and the hollow SnO2

spheres.The PPy coating not only prevents the possible pulverization of the hollow SnO2

spheres,but also prevents the SnO2/Sn spheres from aggregating.Furthermore,the hollow

space within the SnO2nanoparticles effectively mitigates the enormous volume change during

charge–discharge cycling.Meanwhile,the Li+diffusion coefficient in the hollow SnO2@PPy

(21wt%)core–shell nanocomposite electrode is significantly improved compared to the hollow

SnO2microspheres electrode.Thus,these benefits from the PPy coating and the h
ollow SnO2

SnO2microspheres electrode.Thus,these benefits from the PPy coating and the hollow SnO2

spheres are able to provide a robust architecture for lithium-ion battery anodes.

&2014Elsevier Ltd.All rights reserved.

http://www.doczj.com/doc/0e3768986bd97f192279e9c7.html /10.1016/j.nanoen.2014.03.010

2211-2855/&2014Elsevier Ltd.All rights

Core–shell structured hollow SnO2–polypyrrole nanocomposite anodes with enhanced cyclic performanc

reserved.

n Corresponding authors.

E-mail addresses:lininghit@http://www.doczj.com/doc/0e3768986bd97f192279e9c7.html (N.Li),qinglilanl@http://www.doczj.com/doc/0e3768986bd97f192279e9c7.html (Q.Li),wugang@lanl.gov(G.Wu).

Nano Energy(2014)6,73–81