Surface-initiated fluoride-scavenging polymeric layer on cathode materials for lithium-ion batteries
- Surface-initiated fluoride-scavenging polymeric layer on cathode materials for lithium-ion batteries
- 오시형; 이해리; 서효리; 강동구; 임태은
- lithium manganese oxides; spinel; poly(dimethylsiloxane); fluoride scavenging; manganese dissolution
- Issue Date
- Journal of industrial and engineering chemistry
- VOL 53-428
- Spinel-structured lithium manganese oxides (LMOs) suffer from manganese dissolution at elevated temperatures, which leads to severe capacity fading. In this work, a novel strategic approach was developed to alleviate this phenomenon by using poly(dimethylsiloxane) (PDMS) as a simple and scalable electrode additive. LMO electrodes containing finely dispersed PDMS were prepared using a conventional electrode coating process. Electrochemical studies showed that the PDMS-dispersed LMO electrodes had significantly improved cycling retentions. Ex-situ FT-IR and F-19 NMR spectra indicated PDMS chemically scavenged the F- species, which cause manganese dissolution in LMO-based cells. In addition, a plausible mechanism was proposed based on the spectroscopic evidences.
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