Optical Properties and Electrochemical Performance of LiFePO4 Thin Films Deposited on Transparent Current Collectors
- Optical Properties and Electrochemical Performance of LiFePO4 Thin Films Deposited on Transparent Current Collectors
- 이현석; 임해나; 김광범; 최지원
- Lithium Ion Battery; Thin Film Battery; Transparency; Olivine Structure; LiFePO4.
- Issue Date
- Journal of nanoscience and nanotechnology
- VOL 15, NO 11, 8627-8631
- ePO4 thin film cathodes are deposited on various transparent conducting oxide thin films on
glass, which are used as cathode current collectors. The XRD patterns show that the thin films have
the phase of LiFePO4 with an ordered olivine structure indexed to the orthorhombic Pmna space
group. LiFePO4 thin film deposited on various TCO glass substrates exhibits transmittance of about
53%. The initial specific discharge capacities of LiFePO4 thin films are 25.0 Ah/cm2 · m on FTO,
33.0 Ah/cm2 · m on ITO, and 13.0 Ah/cm2 · m on AZO coated glass substrates. Interestingly,
the retention capacities of LiFePO4 thin films are 76.0% on FTO, 31.2% on ITO, and 37.7% on AZO coated glass substrates at 20th cycle. The initial specific discharge capacity of the LiFePO4/FTO
electrode is slightly lower, but the discharge capacities of the LiFePO4/FTO electrode relatively
decrease less than those of the others such as LiFePO4/ITO and LiFePO4/AZO with cycling. The
results reported here provide the high transparency of LiFePO4 thin films cathode materials and
the good candidate as FTO current collector of the LiFePO4 thin film cathode of transparent thin
film rechargeable batteries due to its high transparency and cyclic retention.
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