TY - JOUR
T1 - Revisiting the conversion reaction in ultrafine SnO2 nanoparticles for exceptionally high-capacity Li-ion battery anodes
T2 - The synergetic effect of graphene and copper
AU - Kim, Da Sol
AU - Shim, Hyun Woo
AU - Dar, Mushtaq Ahmad
AU - Yoon, Hyunseok
AU - Song, Hee Jo
AU - Kim, Dong Wan
N1 - Funding Information:
This work was supported by a Korea University Grant, by the R&D Center for Valuable Recycling(Global-Top R&BD Program) of the Ministry of Environment (Project No.: R2-17-2016002250005 ), and by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT and Future Planning ( NRF-2016R1A2B2012728 ). The authors extend their appreciation to the International Scientific Partnership Program ISPP at King Saud University for funding this research work through ISPP# 0076 ).
Funding Information:
This work was supported by a Korea University Grant, by the R&D Center for Valuable Recycling(Global-Top R&BD Program) of the Ministry of Environment (Project No.: R2-17-2016002250005), and by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT and Future Planning (NRF-2016R1A2B2012728). The authors extend their appreciation to the International Scientific Partnership Program ISPP at King Saud University for funding this research work through ISPP# 0076).
PY - 2018/11/15
Y1 - 2018/11/15
N2 - Generally, in SnO2-based anode materials, the reversible alloying/dealloying reaction is the main Li-ion storage mechanism. Interestingly, these materials can show an exceptionally high capacity that is beyond the theoretical value (i.e., 783 mA h g−1 based on Sn + 4.4Li+ + 4.4e− ⇌ Li4.4Sn reaction), owing to the reversibility of the reaction between Sn and Li2O to form SnOx (x = 1, 2), so-called conversion reaction. Herein, we prepare Cu-reduced graphene oxide (rGO)-SnO2 nanocomposites as a model system in order to demonstrate an effective strategy to improve the reversibility of the conversion reaction in SnO2. The incorporation of rGO can prevent the aggregation of SnO2 nanoparticles. Furthermore, the Cu-rGO-SnO2 nanocomposite exhibits the most improved conversion reaction reversibility, resulting in improved cycling performance and high capacity. Ex-situ transmission electron microscopy analysis confirms the high reversibility of the conversion as well as the alloying/dealloying reactions. Also, Cu nanoparticles promote the decomposition of amorphous Li2O, leading to enhancement of the conversion reaction between Sn and Li2O. Therefore, these results demonstrate a strategy for significantly improving the electrochemical performances of SnO2-based anodes for Li-ion batteries.
AB - Generally, in SnO2-based anode materials, the reversible alloying/dealloying reaction is the main Li-ion storage mechanism. Interestingly, these materials can show an exceptionally high capacity that is beyond the theoretical value (i.e., 783 mA h g−1 based on Sn + 4.4Li+ + 4.4e− ⇌ Li4.4Sn reaction), owing to the reversibility of the reaction between Sn and Li2O to form SnOx (x = 1, 2), so-called conversion reaction. Herein, we prepare Cu-reduced graphene oxide (rGO)-SnO2 nanocomposites as a model system in order to demonstrate an effective strategy to improve the reversibility of the conversion reaction in SnO2. The incorporation of rGO can prevent the aggregation of SnO2 nanoparticles. Furthermore, the Cu-rGO-SnO2 nanocomposite exhibits the most improved conversion reaction reversibility, resulting in improved cycling performance and high capacity. Ex-situ transmission electron microscopy analysis confirms the high reversibility of the conversion as well as the alloying/dealloying reactions. Also, Cu nanoparticles promote the decomposition of amorphous Li2O, leading to enhancement of the conversion reaction between Sn and Li2O. Therefore, these results demonstrate a strategy for significantly improving the electrochemical performances of SnO2-based anodes for Li-ion batteries.
KW - Conversion reaction
KW - Cu
KW - Graphene
KW - Lithium-ion battery
KW - SnO
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U2 - 10.1016/j.jallcom.2018.08.076
DO - 10.1016/j.jallcom.2018.08.076
M3 - Article
AN - SCOPUS:85051676196
VL - 769
SP - 1113
EP - 1120
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -