Microwave-assisted synthesis of SnS2/SnO2 composites by l-cysteine and their electrochemical performances when used as anode materials of Li-ion batteries
✍ Scribed by Kun Chang; Wei-xiang Chen; He Li; Hui Li
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 919 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
a b s t r a c t SnS 2 /SnO 2 composites were prepared in a microwave-assisted reaction of a mixture solution of SnCl 4 and l-cysteine and were characterised by XRD, TEM, SEM and EDX. The influence of the mole ratio of SnCl 4 to l-cysteine (l-cys) on the sample was investigated. It was found that using a microwave method, SnS 2 /SnO 2 composites were formed, and SnS 2 /SnO 2 nanoparticles were obtained when the mole ratio of SnCl 4 to l-cysteine was 1:2. With higher contents of l-cys, when the mole ratio of SnCl 4 to l-cys was 1:4, the products were nanosheets instead of nanoparticles. Electrochemical tests demonstrated that the SnS 2 /SnO 2 composites with layer structure exhibited high reversible capacities and good cycling performances when used as anode materials of Li-ion batteries. When the mole ratio of SnCl 4 to l-cys was 1:6, the initial reversible capacity of products was 593 mAh/g, and the retention capacity that was maintained was over 88%. Besides, the retention capacity of products was still excellent at high current charge/discharge.