Photovoltaic Lithium-ion Battery with Layer-Structured Li 2 Mn III 0.2 Mn IV 0.8 O 2.9 Thin Film Chemically Fabricated for Cathodic Active Material

Yutaka Suwazono, Hiroki Nagai and Mitsunobu Sato
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Yutaka Suwazono: Applied Chemistry and Chemical Engineering Program, Graduate School, Kogakuin University, Tokyo 192-0015, Japan
Hiroki Nagai: Department of Applied Physics, School of Advanced Engineering, Kogakuin University, Tokyo 192-0015, Japan
Mitsunobu Sato: Department of Applied Physics, School of Advanced Engineering, Kogakuin University, Tokyo 192-0015, Japan

Energies, 2020, vol. 13, issue 6, 1-10

Abstract: 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 Mn 3+ /Mn 4+ is 1/4, and the chemical formula can be expressed as Li 2 MnO 2.9 . A device was assembled with O-deficient LMO and TiO 2 thin films as each active material, along with an electrolytic solution involving LiPF 6 . 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.

Keywords: Li 2 MnO 3 thin film; photovoltaic device; lithium-ion battery; molecular precursor method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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