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Photovoltaic Lithium-ion Battery with Layer-Structured Li2MnIII0.2MnIV0.8O2.9 Thin Film Chemically Fabricated for Cathodic Active Material

1
Applied Chemistry and Chemical Engineering Program, Graduate School, Kogakuin University, Tokyo 192-0015, Japan
2
Department of Applied Physics, School of Advanced Engineering, Kogakuin University, Tokyo 192-0015, Japan
*
Author to whom correspondence should be addressed.
Energies 2020, 13(6), 1486; https://doi.org/10.3390/en13061486
Received: 15 February 2020 / Revised: 13 March 2020 / Accepted: 17 March 2020 / Published: 21 March 2020
(This article belongs to the Section Solar Energy and Photovoltaic Systems)
Dilithium manganese oxide (LMO) thin film was newly fabricated as an active material on a fluorinated-tin-oxide pre-coated glass electrode by a wet process. A stable LMO precursor solution was developed through the reaction of lithium and manganese acetates with butylamine in ethanol. A spin-coated precursor film was heat-treated at 500 °C in air for 0.5 h. The X-ray diffraction pattern indicates that the resultant film consists of layer-structured LMO crystals. The X-ray photoelectron spectra of LMO thin film suggests that the ratio of Mn3+/Mn4+ is 1/4, and the chemical formula can be expressed as Li2MnO2.9. A device was assembled with O-deficient LMO and TiO2 thin films as each active material, along with an electrolytic solution involving LiPF6. The charging voltages (2.67 and 1.45 V) of this device were recorded by applying a constant current of 0.2 mA and using 1-sun irradiation with no external power supply, respectively. The voltages delivered by this cobalt-free device were 0.63 and 0.13 V higher, respectively, than the corresponding device assembled with lithium cobalt oxide as a cathodic active material. View Full-Text
Keywords: Li2MnO3 thin film; photovoltaic device; lithium-ion battery; molecular precursor method Li2MnO3 thin film; photovoltaic device; lithium-ion battery; molecular precursor method
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Suwazono, Y.; Nagai, H.; Sato, M. Photovoltaic Lithium-ion Battery with Layer-Structured Li2MnIII0.2MnIV0.8O2.9 Thin Film Chemically Fabricated for Cathodic Active Material. Energies 2020, 13, 1486.

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