Synthetically Controlled, Carbon-Coated Co2SnO4/SnO2 Composite Anode for Lithium-ion Batteries
Abstract
The inherent drawbacks of Co2SnO4 in demonstrating the closer-to-theoretical capacity value behavior and the inadmissible volume-expansion-related capacity fade behavior have been surpassed by choosing a tailor-made material composition of Co2SnO4/SnO2, prepared at two different temperatures such as 400°C and 600°C to obtain residual carbon-containing and carbon-free compositions, respectively. Among the products, carbon-coated Co2SnO4/SnO2 composite exhibits better electrochemical performance compared with that of the carbon-free product mainly because of the beneficial effect of carbon in accommodating the volume-expansion-related issues arising from the alloying/de-alloying mechanism. A combination of conversion reaction and alloying/de-alloying mechanism is found to play a vital role in exhibiting closer-to-theoretical capacity values. In other words, an appreciable specific capacity value of 834 mAh g-1 has been exhibited by Co2SnO4/SnO2 anode containing carbon coating, thus, demonstrating the possibility to improve the electrochemical performance of the title anode through carbon coating, which is realized as a result of the addition of carefully manipulated synthesis conditions.
- Publication:
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JOM - Journal of the Minerals, Metals and Materials Society
- Pub Date:
- September 2017
- DOI:
- 10.1007/s11837-017-2436-1
- Bibcode:
- 2017JOM....69i1497M