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 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.
Highlights
We reported on the fabrication of a new photovoltaic lithium-ion battery (PV-LIB)with LiCoO2 (LCO) and titania thin films for cathodic and anodic active materials, respectively.These materials were fabricated on a fluorinated-tin-oxide (FTO) pre-coated glass substrate using the molecular precursor method (MPM) [1]
We report on the fabrication of LMO thin film on an FTO pre-coated glass substrate using a solution-based process, and the corresponding application to cobalt-free PV-LIB
It is important to note that the stable precursor solution could be prepared in a simple one-pot process without using a multidentate ligand, which is usually employed in the conventional MPM
Summary
We reported on the fabrication of a new photovoltaic lithium-ion battery (PV-LIB). With LiCoO2 (LCO) and titania thin films for cathodic and anodic active materials, respectively These materials were fabricated on a fluorinated-tin-oxide (FTO) pre-coated glass substrate using the molecular precursor method (MPM) [1]. The MPM is one of the wet chemical processes, which was developed in our group for fabricating thin films of various metals, metal oxides, and phosphate compounds [1,2,3,4,5,6,7,8,9,10,11,12,13]. We report on the fabrication of LMO thin film on an FTO pre-coated glass substrate using a solution-based process, and the corresponding application to cobalt-free PV-LIB
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