期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 41, 页码 23958-23963出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta04643g
关键词
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资金
- National Natural Science Foundation of China [21703143, 11574264]
- MOE [R-143-000-682-112, R-143-000-A06-112, R-143-000-A75-114]
- Shenzhen Peacock Plan [KQJSCX20170727100802505, KQTD2016053112042971]
- Educational Commission of Guangdong Province [2016KCXTD006]
- Guangdong Special Support Program
Tin selenide (SnSe) nanostructures hold great promise as an anode material in lithium-ion batteries (LIBs) due to their high storage capacity, rapid lithiation kinetics and long-term cycling stability. However, a scalable synthesis of SnSe nanostructures with a well-defined size remains a challenge in chemistry. Here, we report cathodic exfoliation of a bulk SnSe crystal for a high-yield (>90%) synthesis of sub-5 nm scale SnSe quantum dots (QDs). As-exfoliated SnSe QDs demonstrate a superior performance as the anode material for LIBs. Our results reveal that SnSe QDs not only accommodate the volume expansion/contraction during the reversible charging/discharging in LIBs but also increase the effective contact interface area between the nanostructured anode materials and electrolyte, leading to a high charging/discharging rate and superior cycling performance. Additionally, SnSe QD based LIBs exhibit a reversible capacity retention of 550 mA h g(-1) and high coulombic efficiency approaching 100% after 1500 charging/discharging cycles at a current density of 0.5 A g(-1).
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