期刊
NANO LETTERS
卷 19, 期 12, 页码 8793-8800出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03583
关键词
High-volumetric batteries; volumetric capacity; Si/graphite composites; native void space; in situ TEM
类别
资金
- Individual Basic Science and Engineering Research Program through the National Research Foundation of Korea - Ministry of Science and ICT [NRF-2019R1C1C1009324, NRF-2018R1D1A1A02046918]
- Basic Research Lab Program through the National Research Foundation of Korea - Ministry of Science and ICT [NRF-2017R1A4A1015533]
- Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea - Ministry of Science and ICT [2018M1A2A2063341]
- National Research Foundation of Korea [2018M1A2A2063341] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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