Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, Dresden 01069, Germany.
ACS Nano. 2013 Aug 27;7(8):6948-54. doi: 10.1021/nn402164q. Epub 2013 Jul 26.
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 ~75% capacity retention at 200 mA g(-1) after 150 cycles, as well as a superior rate capability of ~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.
我们引入了一种简便的策略，通过使用碳黑作为层间间隔物，采用卷绕纳米技术来制造三明治堆叠的 SnO2/Cu 杂化纳米片作为锂离子电池的多通道阳极。通过采用直接自卷绕和压缩方法，与卷绕的空心管相比，实现了更高的有效体积效率。得益于每个相邻片之间形成的纳米间隙，促进了电子传输和离子扩散，并防止了 SnO2/Cu 纳米片的重叠。结果，三明治堆叠的 SnO2/Cu 杂化纳米片在 100 mA g-1 时表现出高达 764 mAh g-1 的高可逆容量，在 200 mA g-1 时经过 150 次循环后具有约 75%的稳定循环性能保持率，以及在 1 A g-1 时具有约 470 mAh g-1 的优异倍率性能。这种合成方法为设计高性能锂离子电池的多通道阳极提供了一种有前途的途径。
