Journal
ACS NANO
Volume 7, Issue 8, Pages 6948-6954Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn402164q
Keywords
lithium-ion batteries; anodes; SnO2; stacked structures; two-dimensional nanosheets
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Funding
- International Research Training Group (IRTG) project
- PAKT project Electro-chemical energy storage in autonomous systems [49004401]
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We have introduced a facile strategy to fabricate sandwich-stacked SnO2/Cu hybrid nanosheets as multichannel anodes for lithium-ion batteries applying rolled-up nanotechnology with the use of carbon black as intersheet spacer. By employing a direct self-rolling and compressing approach, a much higher effective volume efficiency is achieved as compared to rolled-up hollow tubes.. Benefiting from the nanogaps formed between each neighboring sheet, electron transport and ion diffusion are facilitated and SnO2/Cu nanosheet overlapping is prevented. As a result, the sandwich-stacked SnO2/Cu hybrid nanosheets exhibit a high reversible capacity of 764 mAh g(-1) at 100 mA g(-1) and a stable cycling performance of similar to 75% capacity retention at 200 mA g(-1) after 150 cycles, as well as a superior rate capability of similar to 470 mAh g(-1) at 1 A g(-1). This synthesis approach presents a promising route to design multichannel anodes for high performance Li-ion batteries.
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