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Multiscale Buffering Engineering in Silicon-Carbon Anode for Ultrastable Li-Ion Storage

Journal Article


Abstract


  • Silicon-carbon (Si-C) hybrids have been proven to be the most promising anodes for the next-generation lithium-ion batteries (LIBs) due to their superior theoretical capacity (?4200 mAh g-1). However, it is still a critical challenge to apply this material for commercial LIB anodes because of the large volume expansion of Si, unstable solid-state interphase (SEI) layers, and huge internal stresses upon lithiation/delithiation. Here, we propose an engineering concept of multiscale buffering, taking advantage of a nanosized Si-C nanowire architecture through fabricating specific microsized wool-ball frameworks to solve all the above-mentioned problems. These wool-ball-like frameworks, prepared at high yields, nearly matching industrial scales (they can be routinely produced at a rate of 300 g/h), are composed of Si/C nanowire building blocks. As anodes, the Si-C wool-ball frameworks show ultrastable Li+ storage (2000 mAh g-1 for 1000 cycles), high initial Coulombic efficiency of 90%, and volumetric capacity of 1338 mAh cm-3. In situ TEM proves that the multiscale buffering design enables a small volume variation, only 19.5%, reduces the inner stresses, and creates a very thin SEI. The perfect multiscale elastic buffering makes this material more stable compared to common Si nanoparticle-assembled counterpart electrodes.

Publication Date


  • 2019

Citation


  • Hou, G., Cheng, B., Yang, Y., Du, Y., Zhang, Y., Li, B., . . . Yuan, F. (2019). Multiscale Buffering Engineering in Silicon-Carbon Anode for Ultrastable Li-Ion Storage. ACS Nano, 13(9), 10179-10190. doi:10.1021/acsnano.9b03355

Scopus Eid


  • 2-s2.0-85072554936

Start Page


  • 10179

End Page


  • 10190

Volume


  • 13

Issue


  • 9

Place Of Publication


Abstract


  • Silicon-carbon (Si-C) hybrids have been proven to be the most promising anodes for the next-generation lithium-ion batteries (LIBs) due to their superior theoretical capacity (?4200 mAh g-1). However, it is still a critical challenge to apply this material for commercial LIB anodes because of the large volume expansion of Si, unstable solid-state interphase (SEI) layers, and huge internal stresses upon lithiation/delithiation. Here, we propose an engineering concept of multiscale buffering, taking advantage of a nanosized Si-C nanowire architecture through fabricating specific microsized wool-ball frameworks to solve all the above-mentioned problems. These wool-ball-like frameworks, prepared at high yields, nearly matching industrial scales (they can be routinely produced at a rate of 300 g/h), are composed of Si/C nanowire building blocks. As anodes, the Si-C wool-ball frameworks show ultrastable Li+ storage (2000 mAh g-1 for 1000 cycles), high initial Coulombic efficiency of 90%, and volumetric capacity of 1338 mAh cm-3. In situ TEM proves that the multiscale buffering design enables a small volume variation, only 19.5%, reduces the inner stresses, and creates a very thin SEI. The perfect multiscale elastic buffering makes this material more stable compared to common Si nanoparticle-assembled counterpart electrodes.

Publication Date


  • 2019

Citation


  • Hou, G., Cheng, B., Yang, Y., Du, Y., Zhang, Y., Li, B., . . . Yuan, F. (2019). Multiscale Buffering Engineering in Silicon-Carbon Anode for Ultrastable Li-Ion Storage. ACS Nano, 13(9), 10179-10190. doi:10.1021/acsnano.9b03355

Scopus Eid


  • 2-s2.0-85072554936

Start Page


  • 10179

End Page


  • 10190

Volume


  • 13

Issue


  • 9

Place Of Publication