Journal
ADVANCED MATERIALS
Volume 30, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705430
Keywords
anodes; lithium-ion batteries; nanowires; silicon; strain
Categories
Funding
- Samsung Research Funding & Incubation Center of Samsung Electronics Co. Ltd (A Rapid Charging Battery and its Prototype Cells Retaining High Energy Density) [SRFC-TA1603-01]
- Basic Science Research Program through NRF Korea [NRF-2017R1A4A1015323]
- National Research Foundation of Korea [2017R1A4A1015323] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Despite the advantage of high capacity, the practical use of the silicon anode is still hindered by large volume expansion during the severe pulverization lithiation process, which results in electrical contact loss and rapid capacity fading. Here, a combined electrochemical and computational study on the factor for accommodating volume expansion of silicon-based anodes is shown. 1D silicon-based nanostructures with different internal spaces to explore the effect of spatial ratio of voids and their distribution degree inside the fibers on structural stability are designed. Notably, lotus-root-type silicon nanowires with locally distributed void spaces can improve capacity retention and structural integrity with minimum silicon pulverization during lithium insertion and extraction. The findings of this study indicate that the distribution of buffer spaces, electrochemical surface area, as well as Li diffusion property significantly influence cycle performance and rate capability of the battery, which can be extended to other silicon-based anodes to overcome large volume expansion.
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