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Ultrafast high-temperature sintering of Li7La3Zr1.75Nb0.25Al0.15O12 (LLZO)
Affiliation:1. Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16801, USA;2. Engineering R&D Group, NGK Spark Plug Co., Ltd., Aichi, 485-8510, Japan;3. Materials Research Institute, Pennsylvania State University, University Park, PA, 16801, USA;4. Department of Engineering, Penn State University, Dubois, PA, 15801, USA;5. Department of Chemical Engineering, Pennsylvania State University, University Park, PA, 16801, USA;1. Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, 13th Avenue 29, TEDA, 300457 Tianjin, PR China;2. College of Chemistry and Materials Science, Hebei Key Laboratory of Inorganic Nano-materials, Hebei Normal University, South Second Ring East Road 20, Shijiazhuang, Hebei, PR China;3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;1. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, PR China;2. Corning Incorporated, Corning, NY 14831, USA;3. Corning Research Center China, 200 Jinsu Road, Shanghai 201206, PR China;4. University of Chinese Academy of Sciences, 19?A Yuquan Rd, Shijingshan District, Beijing 100049, PR China
Abstract:Rapid sintering of Li7La3Zr1.75Nb0.25Al0.15O12 (LLZO) is reported. The selection of heating elements, the effect of powder preparation and MgO additions in rapid sintered LLZO are described. Annealing LLZO powder at 750 ºC for 2 h in argon immediately before pressing helped to minimize porosity. A 15–20 s hold at 1372 ºC was sufficient to achieve densities >97%. The total sintering schedule time for rapid sintering represents a 99.7% decrease in sintering time compared to conventional sintering. At 70 °C under a pressure of 4.12 MPa cells had a critical current density of 1020 µA/cm2.
Keywords:Rapid sintering  Solid state battery  Solid electrolyte
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