期刊
ACS APPLIED NANO MATERIALS
卷 6, 期 13, 页码 11070-11076出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.3c00854
关键词
lithium-ion battery; ammonia-borane reduction; tin; core-shell nanoparticle; discharge-chargecapacity
Ammonia-borane reduction of tin (II) chloride was used to prepare customized and interconnected Sn@SnO2 core-shell nanoparticles. The Sn@SnO2-based electrode exhibited high reversible capacity, rate capability, and capacity retention, as well as low charge transfer resistance and electrode polarization. The presence of voids and a SnO2 shell in the interconnected Sn@SnO2 nanoparticles contributed to stable lithium-ion storage.
Ammonia-borane reduction of tin (II) chloride was utilizedto preparecustomized and interconnected Sn@SnO2 core-shellnanoparticles. Remarkably, the Sn@SnO2-based electrodedelivered a reversible capacity of 722 mAh g(-1) at0.5 C after 200 cycles with a Coulombic efficiency of similar to 99%.Also, this electrode exhibited a high rate capability (564 mAh g(-1) at 1.0 C), low charge transfer resistance (44.7 omega),and reasonable electrode polarization (146 mV vs Li/Li+), which led to a high capacity retention (similar to 94%). Additionally,the kinetics of Li-ion storage of the sample revealed that the capacitance contribution plays a main roleat fast C-rates. This new nanoarchitecture is promising for stablelithium-ion storage because of the presence of voids and a SnO2 shell in the interconnected Sn@SnO2 nanoparticles,in which the cavities mitigate its volume expansion upon cycling;meanwhile, the SnO2 layer increases its capacity.
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