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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Native Void Space for Maximum Volumetric Capacity in Silicon-Based Anodes

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Title
Native Void Space for Maximum Volumetric Capacity in Silicon-Based Anodes
Author
Yeom, Su JeongLee, CheolminKang, SujinWi, Tae-UngLee, ChanheeChae, SujongCho, JaephilShin, Dong OkRyu, JungkiLee, Hyun-Wook
Issue Date
2019-12
Publisher
American Chemical Society
Citation
NANO LETTERS, v.19, no.12, pp.8793 - 8800
Abstract
Volumetric energy density is considered a primary factor in developing high-energy batteries. Despite its significance, less efforts have been devoted to its improvement. Silicon-based materials have emerged as next-generation anodes for lithium-ion batteries due to their high specific capacity. However, their volumetric capacities are limited by the volume expansion rate of silicon, which restricts mass loading in the electrodes. To address this challenge, we introduce porous silicon templated from earth-abundant minerals with native internal voids, capable of alleviating volumetric expansion during repeated cycles. In situ transmission electron microscopy analysis allows the precise determination of the expansion rate of silicon, thus presenting an analytical model for finding the optimal content in silicon/graphite composites. The inner pores in silicon reduce problems associated with its expansion and allow higher silicon loading of 42% beyond the conventional limitations of 13–14%. Consequently, the anode designed in this work can deliver a volumetric capacity of 978 mAh cc–1. Thus, suppressing volume expansion with natural abundant template-assisted materials opens new avenues for cost-effective fabrication of high volumetric capacity batteries.
URI
https://scholarworks.unist.ac.kr/handle/201301/30651
URL
https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b03583
DOI
10.1021/acs.nanolett.9b03583
ISSN
1530-6984
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