Photovoltaic Lithium-ion Battery with Layer-Structured Li2MnIII0.2MnIV0.8O2.9 Thin Film Chemically Fabricated for Cathodic Active Material
Photovoltaic Lithium-ion Battery with Layer-Structured Li2MnIII0.2MnIV0.8O2.9 Thin Film Chemically Fabricated for Cathodic Active Material
复制标题
化学法制备层状结构Li2MnIII0.2MnIV0.8O2.9薄膜光伏锂离子电池正极活性材料
DOI：
10.3390/en13061486
复制
发表时间：
2020
期刊：
影响因子：
3.2
通讯作者：
Mitsunobu Sato
中科院分区：
文献类型：
--
作者：
Yutaka Suwazono;H. Nagai;Mitsunobu Sato
通过湿法在氟化氧化锡预涂玻璃电极上新制备了二锂锰氧化物（LMO）薄膜作为活性材料。通过乙酸锂和乙酸锰与丁胺在乙醇中的反应，形成了稳定的 LMO 前体溶液。将旋涂前体膜在空气中于 500°C 下热处理 0.5 小时。 X射线衍射图表明所得薄膜由层状结构的LMO晶体组成。 LMO薄膜的X射线光电子能谱表明Mn3+/Mn4+的比例为1/4，化学式可表示为Li2MnO2.9。该装置由缺氧 LMO 和 TiO2 薄膜作为每种活性材料以及含有 LiPF6 的电解液组装而成。该装置的充电电压（2.67 和 1.45 V）分别通过施加 0.2 mA 的恒定电流和在没有外部电源的情况下使用 1-sun 照射来记录。这种无钴器件所提供的电压分别比用钴酸锂作为阴极活性材料组装的相应器件高 0.63 伏和 0.13 伏。
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.