Synthesis and Electrochemical Reaction of Tin Oxalate-Reduced Graphene Oxide Composite Anode for Rechargeable Lithium Batteries
- Title
- Synthesis and Electrochemical Reaction of Tin Oxalate-Reduced Graphene Oxide Composite Anode for Rechargeable Lithium Batteries
- Author
- 선양국
- Keywords
- tin oxalate; reduced graphene oxide; conversion; alloy; anode; lithium; battery
- Issue Date
- 2017-07
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v. 9, no. 31, page. 25941-25951
- Abstract
- Unlike for SnO2, few studies have reported on the use of SnC2O4 as an anode material for rechargeable lithium batteries. Here, we first introduce a SnC2O4-reduced graphene oxide composite produced via hydrothermal reactions followed by a layer-by-layer self-assembly process. The addition of rGO increased the electric conductivity up to similar to 10(-3) S cm(-1). As a result, the SnC2O4-reduced graphene oxide electrode exhibited a high charge (oxidation) capacity of similar to 1166 mAh g(-1) at a current of 100 mA g(-1) (0.1 C-rate) with a good retention delivering approximately 620 mAh g(-1) at the 200th cycle. Even at a rate of 10 C (10 A g(-1)), the composite electrode was able to obtain a charge capacity of 467 mAh g(-1). In contrast, the bare SnC2O4 had inferior electrochemical properties relative to those of the SnC2O4-reduced graphene oxide composite: similar to 643 mAh g(-1) at the first charge, retaining 192 mAh g(-1) at the 200th cycle and 289 mAh g(-1) at 10 C. This improvement in electrochemical properties is most likely due to the improvement in electric conductivity, which enables facile electron transfer via simultaneous conversion above 0.75 V and de/alloy reactions below 0.75 V: SnC2O4 + 2Li(+) + 2e(-) -> Sn + Li2C2O4 + xLi(+) + xe(-) -> LixSn on discharge (reduction) and vice versa on charge. This was confirmed by systematic studies of ex situ X-ray diffraction, transmission electron microscopy, and time-of-flight secondary-ion mass spectroscopy.
- URI
- https://pubs.acs.org/doi/10.1021/acsami.7b03325https://repository.hanyang.ac.kr/handle/20.500.11754/114818
- ISSN
- 1944-8244; 1944-8252
- DOI
- 10.1021/acsami.7b03325
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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