报 告 人：王霖 教授（北京高压科学研究中心）

报告题目：High-Pressure: an unique dimension towards new understanding and applications

报告时间：2018年5月4日（周五）上午9:30

报告地点：物理与电子工程学院4楼学术报告厅

主办单位：科学技术研究院、物电学院

报告摘要：

In this talk, I would like to present our progresses we made in recent few years using extreme pressure condition on a variety of compounds including fullerenes, superconducting hydrogen-rich compound and lithium ion battery material. With high pressure in-situ measurements, an unique crystalline material containing amorphous clusters was created and recovered at ambient conditions. It was revealed that phosphine, the recently discovered high pressure superconductor, undergoes two steps of polymerization at high pressure. The final product P4H6 is responsible for the superconductivity, proving a crucial information in understanding the superconducting mechanism of this system. LTO is an important lithium ion battery material with excellent cycling performance. However, it shows poor electronic and ionic conductivity, which limit its application. Our high pressure experiments indicate that the crystalline LTO turns into amorphous under extreme compression and its conductivity is greatly enhanced simultaneously. Theoretical calculations reveale that the amorphous phase induced by high pressure can promote diffusion of Li+ and increase its ionic conductivity by providing ion migration defects. This finding offers a new idea for improving the conductivity of a LTO anode in Li-ion batteries using a high-pressure technique.。

报告人简介：

王霖，北京高压科学研究中心终身研究员。于2006年毕业于吉林大学超硬材料国家重点实验室，获物理学博士学位；2007-2014期间在美国卡内基研究院从事博士后等合作科学研究工作。他长期从事高压物理、超高压条件下材料物性、超高压加载和实验技术、高压同步辐射技术等研究工作。首次在实验中合成出了一种的“长程有序而短程却无序”特殊结构材料，打破了大家对凝聚态物质原子结构的认识。他率先将纳米级聚集的X射线应用于超高压研究中，解决了超高压条件下存在的多项实验难题。已在Science、Nature、Review of Modern Physics、Physics Review Letters、PNAS、Advanced Materials等国际知名学术期刊发表SCI论文90余篇，论文已被引用2200余次。现担任Scientific Reports和American Journal of Nanomaterials的编委；曾被邀担任Journal of Spectroscopy的客座主编。