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Indexed by:期刊论文

Date of Publication:2017-06-07

Journal:JOURNAL OF MATERIALS CHEMISTRY A

Included Journals:SCIE、EI

Volume:5

Issue:21

Page Number:10398-10405

ISSN No.:2050-7488

Abstract:The interest in Na-ion batteries (NIBs) is growing exponentially since Na is more abundant and affordable than Li for large-scale energy storage applications. However, the lack of truly durable and high-capacity electrode materials still remains a key bottle-neck issue for the development of practical NIBs. In this work, we report the rational design of an ultra-long life anode material for NIBs by integrating the structural merits of hollow nanostructures, carbon nanocoating and amorphous structures together into a binary metal sulfide system. Amorphous CoSnSx nanoboxes sheathed in N-doped carbon are yielded by templating against single-crystalline CoSn(OH)(6) nanoboxes, followed by polymer nanoplating and carbonization. The synergy of diverse structural features enables a robust structure and fast reaction kinetics for Na storage in the CoSnSx@NC anode, leading to an exceptionally long cycle life of 4000 cycles with very slow capacity loss (0.0075% per cycle) and high power output. The full cells assembled from the Na3V2(PO4)(3)/C cathode and the CoSnSx@NC anode deliver a high energy density of up to 86.6 W h kg(-1), as well as good capacity retention at high current rate.