Parasitic Reactions in Nanosized Silicon Anodes for Lithium-Ion Batteries
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Univ. of Duisburg-Essen, Duisburg (Germany)
When designing nano-Si electrodes for lithium-ion batteries, the detrimental effect of the c-Li15Si4 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-Li15Si4 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-Li15Si4 phase could disappear at the end of lithiation. This suppression of c-Li15Si4 improved cycle life of the nano-Si electrodes but with a little loss of specific capacity. Also the characteristic c-Li15Si4 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1372062
- Journal Information:
- Nano Letters, Journal Name: Nano Letters Journal Issue: 3 Vol. 17; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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