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Porous Silicon@Polythiophene Core-Shell Nanospheres for Lithium-Ion Batteries.
- 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]
- Subjects :
- LITHIUM ions
ELECTRIC batteries
ALKALI metal ions
POLYTHIOPHENES
SILICON
Subjects
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