期刊
NANOSCALE
卷 4, 期 18, 页码 5731-5737出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr31307c
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资金
- National Natural Science Foundation of China [21003041, 21103046]
- Hunan Provincial Natural Science Foundation of China [10JJ1011, 11FH003]
In this report, we present a hybrid structure involving a small quantity of Co element uniformly deposited on porous SnO2 spheres as stable and high capacity anode materials for lithium-ion batteries. Specifically, Co element deposited on SnO2 nanomaterials exhibited an exceptional reversible capacity of 810 mA h g(-1) after 50 cycles which is higher than the pure SnO2 electrode. Based on the experiments results, a possible mechanism for the change of this structure during lithium ion insertion/extraction was proposed. The minute quantity of Co element uniformly deposited on SnO2 spherical structure could prevent Sn aggregation during charging-discharging, and high porosity of the spherical structure allowed the volume expansion during lithium ion alloying/dealloying. The SnO2 deposited with small quantities of Co element as electrode facilitated improved performance of lithium ion batteries with higher energy densities.
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