Quantum confinement and its related effects on the critical size of GeO2 nanoparticles anodes for lithium batteries.
Nano Lett
; 14(2): 1005-10, 2014 Feb 12.
Article
in En
| MEDLINE
| ID: mdl-24392754
ABSTRACT
This work has been performed to determine the critical size of the GeO2 nanoparticle for lithium battery anode applications and identify its quantum confinement and its related effects on the electrochemical performance. GeO2 nanoparticles with different sizes of â¼ 2, â¼ 6, â¼ 10, and â¼ 35 nm were prepared by adjusting the reaction rate, controlling the reaction temperature and reactant concentration, and using different solvents. Among the different sizes of the GeO2 nanoparticles, the â¼ 6 nm sized GeO2 showed the best electrochemical performance. Unexpectedly smaller particles of the â¼ 2 nm sized GeO2 showed the inferior electrochemical performances compared to those of the â¼ 6 nm sized one. This was due to the low electrical conductivity of the â¼ 2 nm sized GeO2 caused by its quantum confinement effect, which is also related to the increase in the charge transfer resistance. Those characteristics of the smaller nanoparticles led to poor electrochemical performances, and their relationships were discussed.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Journal:
Nano Lett
Year:
2014
Document type:
Article
Affiliation country: