Abstract
We fabricated lithium trivanadate LiV3O8 (LVO) film electrodes for the first time on a garnet-type Ta-doped Li7La3Zr2O12 (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−1 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.
Highlights
All-solid-state lithium (Li) ion batteries (LiBs) are expected to be part of the generation of energy storage devices because of their high energy density, high safety and reliability [1,2,3].The ceramic materials used as solid electrolytes (SEs) must have, high lithium-ion (Li+ )conductivity above 10−3 S cm−1 at room temperature, and deformability and chemical stability against electrode materials, air and moisture
Ball‐milled LVO powders with a particle size of 0.5–2 μm are on a garnet‐type Li6.55 La3 Zr1.55 Ta0.45 O12 (LLZT) solid electrolyte
Ball‐milled LVO powders with a particle size of 0.5–2 μm are suitable for film fabrication by aerosol deposition (AD)
Summary
The ceramic materials used as solid electrolytes (SEs) must have, high lithium-ion (Li+ ). Conductivity above 10−3 S cm−1 at room temperature, and deformability and chemical stability against electrode materials, air and moisture. Oxide-based SEs have a relatively low conductivity and poor deformability compared to sulfide-based ones, while they have other advantages, such as chemical stability and ease of handling [4,5,6]. Garnet-type Li-stuffed oxide, Li7 La3 Zr2 O12 (LLZ), has been extensively studied because of its good ionic conducting property, excellent thermal performance, and high electrochemical stability [7]. LLZ has two different crystal phases, one is the cubic phase [7,8] and the other is tetragonal one [9,10], but the former has two orders higher conductivity at room temperature than the latter. Partial substitution of the Zr4+ site by other higher valence cations, such as Nb5+ [11,12] and Ta5+ [13,14,15,16,17,18,19]
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