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Title: Parasitic Reactions in Nanosized Silicon Anodes for Lithium-Ion Batteries

When designing nano-Si electrodes for lithium-ion batteries, the detrimental effect of the c-Li 15Si 4 phase formed upon full lithiation is often a concern. In this study, Si nanoparticles with controlled particle sizes and morphology were synthesized and parasitic reactions of the metastable c-Li 15Si 4 phase with the non-aqueous electrolyte was investigated. The use of smaller Si nanoparticles (~ 60 nm) and the addition of fluoroethylene carbonate additive played decisive roles in the parasitic reactions such that the c-Li 15Si 4 phase could disappear at the end of lithiation. This suppression of c-Li 15Si 4 improved cycle life of the nano-Si electrodes but with a little loss of specific capacity. Also the characteristic c-Li 15Si 4 peak in the dQ/dV plots can be used as an early-stage indicator to cell capacity fade during cycling. Lastly, our findings can contribute to the design guidelines of Si electrodes and allow us to quantify another factor to the performance of the Si electrodes.
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  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Univ. of Duisburg-Essen, Duisburg (Germany)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 3; Journal ID: ISSN 1530-6984
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
25 ENERGY STORAGE; lithium-ion battery; interfacial reaction; leakage current; parasitic reaction; silicon nanoparticles
OSTI Identifier: