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Lithium-ion conducting glass-ceramic electrolyte in the composition 75Li2S·5P2S3 ·20P2S5 (mol%) was prepared by heat treatment of an amorphous precursor. The amorphous precursor was obtained by a high-energy ball-milling process. The glass ceramic showed high ion conductivity 2.0×10−3 Scm−1 at room temperature. Raman scattering measurements suggested that the glass ceramic essentially composed of thio-phosphate anions, PS4 3− and P2S6 4−, as structural units. A laboratory-scale all-solid-state battery was also assembled by use of the glass ceramic as solid electrolytes and LiNi1/3Mn1/3Co1/3O2 powders as positive electrode materials. The all-solid-state battery showed good charge–discharge cycle performance at room temperature under a constant current density of 0.1 mAcm−2. [ABSTRACT FROM AUTHOR]

Abstract: LiAlO2-coated LiNi1/3Mn1/3Co1/3O2 powders were prepared by a sol–gel method associated with ultra-sonication, and the obtained LiAlO2-coated LiNi1/3Mn1/3Co1/3O2 was investigated as positive electrode materials for all-solid-state batteries with sulfide-based solid electrolytes. All-solid-state lithium batteries were assembled with the obtained LiAlO2-coated LiNi1/3Mn1/3Co1/3O2 powders and with amorphous Li3PS4 as solid electrolytes. The charge–discharge cycle performance of the all-solid-state cells was improved by the LiAlO2-coating on LiNi1/3Mn1/3Co1/3O2 powders. The LiAlO2 coating was effective in suppressing an increasing of the interfacial resistance between the LiNi1/3Mn1/3Co1/3O2 electrode material and the sulfide based solid electrolyte, Li3PS4, during charge–discharge cycling. The battery with the 1.0mol% LiAlO2-coated LiNi1/3Mn1/3Co1/3O2 showed an initial discharge capacity of 134 mAhg−1 and the battery retained the capacity more than 124 mAhg −1 even after 400 charge–discharge cycles at a current density of 11 mAg −1 at room temperature. [Copyright &y& Elsevier]

Abstract: All-solid-state lithium batteries were fabricated by use of LiNi1/3Mn1/3Co1/3O2 powders coated with ZrO2 as positive electrode materials and amorphous Li3PS4 as solid electrolytes. The ZrO2-coated powders were prepared by a sol–gel method associated with ultrasonic irradiation. The charge–discharge cycle performance of the all-solid-state cells was improved by use of the ZrO2-coated LiNi1/3Mn1/3Co1/3O2 powders. The ZrO2 coating was effective in suppressing an increasing of the interfacial resistance between the LiNi1/3Mn1/3Co1/3O2 electrode material and the sulfide based solid electrolyte, a-Li3PS4, during charge–discharge cycling. The battery with the ZrO2-coated LiNi1/3Mn1/3Co1/3O2 showed an initial discharge capacity of 115mAhg−1 and good capacity retention even after 50cycles at a current density of 0.1mAcm−2 at room temperature. [Copyright &y& Elsevier]

Abstract: Sulfur–carbon composites were investigated as positive electrode materials for all-solid-state lithium ion batteries with an inorganic solid electrolyte (amorphous Li3PS4). The elemental sulfur was mixed with Vapor-Grown Carbon Fiber (VGCF) and with the solid electrolyte (amorphous Li3PS4) by using high-energy ball-milling process. The obtained sulfur–VGVF–solid electrolyte composite was used as positive electrode materials of the all-solid-state battery. The composite showed good electrochemical properties as positive electrode materials. The capacity that was calculated on the base of the weight of sulfur was about 1300mAhg−1 at room temperature, when the all-solid-state battery was discharged and charged in the voltage range of 0.9 to 2.6V at a constant current density of 0.1mAcm−2. The battery kept the capacity more than 1200mAhg−1 even after 50 discharge–charge cycles. [Copyright &y& Elsevier]

Abstract: An all-solid-state lithium-ion battery (ASSB) using non-flammable solid electrolytes is a candidate for a next-generation battery. Although the excellent cycle performance and its high energy density are suggested in the literature, a practical size battery has not been appeared yet. In this paper, we have adopted a sulfide based electrolyte, Li2S–P2S5 (80:20 mol%) to a rocking chair type lithium ion battery. The electrochemical cell consists of a Li2O–ZrO2 coated LiNi0.8Co0.15Al0.05O2 (NCA) cathode, an artificial graphite anode and the sulfide based electrolyte without any organic and inorganic liquids. The cathode charge transfer resistance is significantly reduced by the Li2O–ZrO2 coating. The total cell resistance of the Li2O–ZrO2 (LZO) coated NCA adopted cell is approximately one quarter of non-treated one. A standard type single cell with the nominal capacity of 100 mAh at 25 °C is fabricated by wet printing process, and its capacity retention is approximately 80% at 100 cycles. Also, a 1 Ah class battery was constructed by stacking the single cells, and demonstrated. [Copyright &y& Elsevier]