Back to Search Start Over

Porous Silicon@Polythiophene Core-Shell Nanospheres for Lithium-Ion Batteries.

Authors :
Zheng, Hao
Fang, Shan
Tong, Zhenkun
Dou, Hui
Zhang, Xiaogang
Source :
Particle & Particle Systems Characterization; Feb2016, Vol. 33 Issue 2, p75-81, 7p
Publication Year :
2016

Abstract

Polythiophene-coated porous silicon core-shell nanospheres (Si@PTh) composite are synthesized by a simple chemical oxidative polymerization approach. The polythiophene acts as a flexible layer to hold silicon grains when they are repeatedly alloying/dealloying with lithium during the discharge/charge process. The long lifespan and high-current-density rate ­capability (at a current of 8 A g<superscript>−1</superscript>) of the Si@PTh composite are vastly improved compared with as-prepared Si spheres. Typically, these Si@PTh composite electrodes achieve a reversible capacity of 1130.5 mA h g<superscript>−1</superscript> at 1 A g<superscript>−1</superscript> current density after 500 cycles, and can even possess a discharge capacity up to 451.8 mA h g<superscript>−1</superscript> at 8 A g<superscript>−1</superscript>. The improved electrochemical performance can be ascribed to the synergy effects of the flexible PTh coating and the distinctive core-shell nanospheres with porous structure, which can largely alleviate the volume expansion of the Si during alloying with lithium. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09340866
Volume :
33
Issue :
2
Database :
Complementary Index
Journal :
Particle & Particle Systems Characterization
Publication Type :
Academic Journal
Accession number :
112926069
Full Text :
https://doi.org/10.1002/ppsc.201500183