Inada Ryoji, Okuno Kohei, Kito Shunsuke, Tojo Tomohiro, Sakurai Yoji
Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1 Tempaku-cho, Toyohashi, Aichi 4418580, Japan.
Materials (Basel). 2018 Sep 1;11(9):1570. doi: 10.3390/ma11091570.
We fabricated lithium trivanadate LiV₃O₈ (LVO) film electrodes for the first time on a garnet-type Ta-doped Li₇La₃Zr₂O (LLZT) solid electrolyte using the aerosol deposition (AD) method. Ball-milled LVO powder with sizes in the range of 0.5⁻2 µm was used as a raw material for LVO film fabrication via impact consolidation at room temperature. LVO film (thickness = 5 µm) formed by AD has a dense structure composed of deformed and fractured LVO particles and pores were not observed at the LVO/LLZT interface. For electrochemical characterization of LVO film electrodes, lithium (Li) metal foil was attached on the other end face of a LLZT pellet to comprise a LVO/LLZT/Li all-solid-state cell. From impedance measurements, the charge transfer resistance at the LVO/LLZT interface is estimated to be around 10³ Ω cm² at room temperature, which is much higher than at the Li/LLZT interface. Reversible charge and discharge reactions in the LVO/LLZT/Li cell were demonstrated and the specific capacities were 100 and 290 mAh g at 50 and 100 °C. Good cycling stability of electrode reaction indicates strong adhesion between the LVO film electrode formed via impact consolidation and LLZT.
我们首次使用气溶胶沉积（AD）法在石榴石型钽掺杂锂镧锆氧化物（LLZT）固体电解质上制备了三钒酸锂LiV₃O₈（LVO）薄膜电极。尺寸在0.5⁻2 µm范围内的球磨LVO粉末用作通过室温下的冲击固结制备LVO薄膜的原料。通过AD形成的LVO薄膜（厚度 = 5 µm）具有由变形和破碎的LVO颗粒组成的致密结构，并且在LVO/LLZT界面处未观察到孔隙。为了对LVO薄膜电极进行电化学表征，将锂（Li）金属箔附着在LLZT颗粒的另一端面上，以构成LVO/LLZT/Li全固态电池。通过阻抗测量，室温下LVO/LLZT界面处的电荷转移电阻估计约为10³ Ω cm²，这比Li/LLZT界面处的电阻高得多。LVO/LLZT/Li电池中展示了可逆的充放电反应，在50和100 °C下的比容量分别为100和290 mAh g。电极反应良好的循环稳定性表明通过冲击固结形成的LVO薄膜电极与LLZT之间具有很强的附着力。
