报告题目:钴酸锂正极的原子尺度结构相变
报告人:卢侠 教授(中山大学)
报告时间:2021年12月14日(周二)下午15:00
报告地点:华南理工大学大学城校区B5栋102会议室
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报告摘要:A collective and quasi-continuous glide of CoO6 slabs is captured in layered LiCoO2 through a combination of in-situ XRD and ex-situ STEM characterizations. Such delithiation mechanism does not involve the nucleation-and-growth type delithiation process, represents a completely different manner from the conventionally phase-separation or solid-solution transition process. The collective glide of CoO6 slabs reflects the linkage of adjacent CoO6 slabs that endows the delithiation behavior with life to perceive the motion of Li inside LiCoO2 structure, and quickly responds to even a minor Li loss with the structural adjustment as noted by gradual angle. After the O3 to O1 transition, the layered Li(1-x)CoO2 is then transformed to a metastable cubic phase as the layer-to-spinel transition, which mainly accounts for the structure and capacity fading upon delithiation. The lessons from LiCoO2 delithiation provide a novel, but different insight to understand the working mechanism of layered oxide materials and thus may shed new light on exploring the satisfactory electrode materials for LIBs.
个人简介:卢侠,中山大学材料学院教授,博士生导师。2013在中国科学院物理研究所获得凝聚态物理博士学位;2018年12月以“百人计划”中青年杰出人才入职中山大学,围绕电池材料与界面开展工作,对Li在材料中存储与输运机制,以及与脱嵌锂相关的结构演化、电荷转移、空间电荷序、界面/表面结构进行深入表征,入选2019年广东省“珠江人才”计划,主持国家自然科学基金面上、青年以及企业横向等,作为项目骨干参与科技部重点研发计划。发表论文80余篇,H-index为32,被引用超过5200次。