报告题目：Ion Transport in Lithium-Ion Conducting Solid Electrolytes: Oxides and Composites
报 告 人： 郭新
报告时间：2019年11月7日 9:00-10:00
报告地点：将军路校区 8号楼 8311
主办单位：材料科学与技术学院
报告人简介：
郭新，华中科技大学材料学院二级教授，中国固态离子学会理事，国际期刊“Solid State Ionics”编委，国际固态离子学会（International Society for Solid State Ionics）学术奖评审委员。回国前任德国于利希研究中心（Research Center Juelich）终身高级研究员，之前，他曾在德国马普固体研究所（Max Planck Institute for Solid State Research）从事研究工作多年。2005年获美国陶瓷协会Ross Coffin Purdy Award。在主流国际学术会议（如MRS, E-MRS, ECS, MS&T等）及国际著名高校和研究机构（如麻省理工学院、斯坦福大学、瑞士联邦工学院、德国马普研究所等）作过数十场邀请报告，在包括“Science”的学术期刊发表论文百余篇。2012年全职回国后创建了“固态离子学实验室”，其研究领域可概括为“固态离子导体与混合导体及其在信息、能源与环境等领域的应用”。具体研究领域有: 1.固体电解质与固态电池，2.类脑器件与脑启发式人工智能，3.气敏传感器及人工嗅觉，4.功能器件的3D打印。
报告摘要：
A solid-state battery is a battery technology that uses solid electrodes and a solid electrolyte, instead of the liquid or polymer gel electrolytes found in lithium-ion or lithium polymer batteries. A few issues about the ion transport in oxide ceramics with garnet and perovskite structures, and oxide-polymer composites are discussed in this talk, including: 1. Ionic conduction in Li7La3Zr2O12 (LLZO) garnets, and the strategy to enhance the ionic conductivity by proper doping; 2. The surface property of LLZO garnets. Without any surface modification, Li2CO3-free LLZO shows an intrinsic “lithiophilicity” characteristic, which leads to a continuous and tight Li/LLZO interface, resulting in an ultra-low interfacial resistance of 49 Ω cm2 and a homogenous current distribution in the charge/discharge processes; 3. Physical origin of the low grain boundary conductivity of Li3xLa0.67-x□0.33-2xTiO3. The origin of the low grain boundary conductivity should be understood as a prerequisite to improve the overall conductivity; 4. Ionic conduction in oxide-polymer composites. We use the LLZO-PEO composite as a model system and develop a conduction model based on the two-phase mixture theory.
