TY - JOUR
T1 - Atomically Dispersed Sn Incorporated into Carbon Matrix for Stable Electrochemical Lithium Storage
AU - Li, Qiongguang
AU - Yuan, Menglei
AU - Ji, Yongjun
AU - Chen, Xiao
AU - Wang, Yanhong
AU - Gao, Xingyue
AU - Li, Huifang
AU - He, Hongyan
AU - Chen, Han
AU - Tan, Qiangqiang
AU - Xu, Guangwen
AU - Zhong, Ziyi
AU - Su, Fabing
PY - 2022/2/19
Y1 - 2022/2/19
N2 - Although possessing a high specific capacity, the practical implementation of SnO2 nanoparticles as a promising anode for lithium-ion batteries (LIBs) is hampered by their poor cyclability. This work demonstrates that incorporating single atomic Sn (SASn) species into a carbon matrix can address this issue effectively. The SASn/C composite was synthesized via polymerization of formaldehyde and 3-aminophenol in the presence of Tin (II) chloride, followed by pyrolysis. The SASn atoms were homogeneously dispersed in the carbon matrix. Each Sn atom coordinated with two O and two C atoms, forming the Sn-O-C and Sn-C bonds, providing channels for fast electron/ion transfer and boosting electrochemical kinetics. The SASn/C anode exhibited unique lithium storage behaviors, enhanced lithium storage capability, and excellent cyclic stability with a capacity fading rate of 0.0031% per cycle at 1000 mA g-1 after 7000 cycles. Density functional theory calculations reveal that one SASn atom can adsorb three Li+ ions at the fully discharged state during the discharging process. Subsequently, the Li+ ions are directly desorbed from the SASn atom, which is different from the traditional multi-step de-alloying process. This facile strategy represents a significant advancement in developing high-performance Sn-based anode materials for LIBs.
AB - Although possessing a high specific capacity, the practical implementation of SnO2 nanoparticles as a promising anode for lithium-ion batteries (LIBs) is hampered by their poor cyclability. This work demonstrates that incorporating single atomic Sn (SASn) species into a carbon matrix can address this issue effectively. The SASn/C composite was synthesized via polymerization of formaldehyde and 3-aminophenol in the presence of Tin (II) chloride, followed by pyrolysis. The SASn atoms were homogeneously dispersed in the carbon matrix. Each Sn atom coordinated with two O and two C atoms, forming the Sn-O-C and Sn-C bonds, providing channels for fast electron/ion transfer and boosting electrochemical kinetics. The SASn/C anode exhibited unique lithium storage behaviors, enhanced lithium storage capability, and excellent cyclic stability with a capacity fading rate of 0.0031% per cycle at 1000 mA g-1 after 7000 cycles. Density functional theory calculations reveal that one SASn atom can adsorb three Li+ ions at the fully discharged state during the discharging process. Subsequently, the Li+ ions are directly desorbed from the SASn atom, which is different from the traditional multi-step de-alloying process. This facile strategy represents a significant advancement in developing high-performance Sn-based anode materials for LIBs.
KW - Single atom Sn
KW - Cyclability
KW - Lithium storage mechanism
KW - Anode
KW - Lithium-ion batteries
U2 - 10.1016/j.cej.2022.135340
DO - 10.1016/j.cej.2022.135340
M3 - 文章
SN - 1385-8947
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -