硫氮掺杂碳纳米管

Sulfur e nitrogen doped multi walled carbon nanotubes composite as a cathode material for lithium sulfur batteries

Yinchuan Li a ,Rui Mi b ,Shaomin Li b ,Xichuan Liu b ,Wei Ren b ,Hao Liu b ,*,Jun Mei a ,**,Woon-Ming Lau b

a

School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,PR China b

Chengdu Green Energy and Green Manufacturing Technology R&D Center,Chengdu Development Center of Science and Technology,China Academy of Engineering Physics,Southwest Airport Economic Development Zone,Shuangliu,Chengdu 610207,PR China

a r t i c l e i n f o

Article history:

Received 31October 2013Received in revised form 26February 2014Accepted 6April 2014Available online 11May 2014Keywords:Nitrogen doped Carbon nanotubes Lithium e sulfur batteries Sulfur distribution

a b s t r a c t

The performance of lithium sulfur (Li/S)battery was greatly improved by the employment of nitrogen doped carbon nanotubes (N-CNTs)based cathode.By manipulating its structure thereby creating more defects,N-CNTs presents better dispersion of sulfur particles on N-CNTs and higher electrical conductivity compared with their non-doped counterpart,which explain the reason why N-CNTs/S composite shows improved performance.The specific discharge capacity was maintained at 625mAh g À1and 513mAh g À1after 100cycles at 0.2C and 0.5C,respectively,which was about 2times as that of CNTs.This method is proved to be a promising way to develop cathode materials for lithium sulfur batteries.

Copyright ª2014,Hydrogen Energy Publications,LLC.Published by Elsevier Ltd.All rights

reserved.

Introduction

The increasing capabilities of portable electronic devices as well as the desire for long driving distances between re-charges of electric vehicles require electrical energy storage systems with high energy density [1].The Lithium/sulfur (Li/S)battery is an attractive and promising candidate among emerging battery technology.It has attracted great interest as

potential energy storage devices for electrical vehicles and other applications needing large-scale electricity storage [2].Conventional Li/S cells consist of a lithium metal anode,an organic liquid electrolyte,and a sulfur composite cathode [3].Sulfur is useful in the cathode because assuming complete reaction to Li 2S,it has a theoretical specific capacity of 1672mAh g À1,and energy density of 2600Wh Kg À1[4],which is significantly higher than the conventional lithium-ion cathode materials [5].

*Corresponding author .Tel.:þ862867076208;fax:þ862867076210.**Corresponding author .Tel.:þ862867076202.

E-mail addresses:mliuhao@ (H.Liu),meijun12@ (J.

Mei).

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i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 39(2014)16073e 16080

/10.1016/j.ijhydene.2014.04.047

0360-3199/Copyright ª2014,Hydrogen Energy Publications,LLC.Published by Elsevier Ltd.All rights reserved.