基于软X射线光谱的锂电池材料的电子结构与演变的研究进展  

Progress of Key Electronic States in Lithium Ion Battery Materials Probed Through Soft X-ray Spectroscopy

作　　者：卓增庆 潘锋 ZHUO Zengqing;PAN Feng(School of Advanced Materials,Peking University Shenzhen Graduate School,Shenzhen 518055,China)

机构地区：[1]北京大学深圳研究生院,新材料学院,深圳518055

出　　处：《高等学校化学学报》2021年第8期2332-2341,共10页Chemical Journal of Chinese Universities

基　　金：国家材料基因组重点专项(批准号:2016YFB0700600);深圳市科技计划项目(批准号:JCYJ20200109140416788)资助~~。

摘　　要：开发新型高能量密度以及低成本的锂离子电池,是有效应对能源危机和环境挑战的可行路径之一.锂离子电池材料的电子结构与电子态的演化决定了材料诸多本征性质以及电池综合性能.探测并操控电极材料电子态的演化对探求电极反应的物理机理、促进电池材料发展具有重要意义.基于同步辐射的软X射线光谱技术可以直接探测费米能级附近的电子态.本文从阴阳离子氧化还原反应的不同角度对利用软X射线光谱对电子态演变的研究进行了总结,获得了电极材料电化学循环过程中过渡金属与氧的电子态演化信息,系统阐述并总结了不同锂离子电池材料中电子态的演化以及氧化还原反应机理的最新研究进展.The formidable challenges for developing high energy/power density,low cost,and safe lithium ion battery have necessitated employing advanced tools to understand the intrinsic physical and chemical pro-perties of battery materials.Electronic structure of batteries materials determines the electrochemical performance,e.g.,the potential and sequence of cationic and anionic redox,the voltage and capacity decay mechanism upon electrochemical cycling.It is crucial to detect and control the electronic state evolution of battery materials through advanced experimental characterizations.Synchrotron based soft X-ray spectroscopy stands out as one of the most effective way directly measuring both the occupied and unoccupied states in the vicinity of Fermi level,which is relevant to battery comprehensive performance.As core level spectroscopies,soft X-ray spectroscopy provides direct probe of the relevant transition-metal(TM)3d states and anion p states in battery materials with elemental,chemical,and orbital sensitivity through excitation from core state to shallow unoccupied state.Quantitative analysis of TM L-edge and anion K-edge soft X-ray spectroscopy provides detailed information about local structural effects,valence,and spin states of battery materials.In this work,we review the soft X-ray spectroscopy of the evolution of electronic state in battery materials.We start with an overview of the main experimental aspects of soft X-ray spectroscopy.We subsequently discuss both cationic and anionic redox in battery materials through soft X-ray spectroscopy,which is meaningful in practice for enhancing the performance of a battery.The recently developed mapping of resonant inelastic X-ray scattering(mRIXS)is a powerful probe of battery chemistry with superior sensitivity.The mRIXS is demonstrated as a reliable technique for fingerprinting oxygen redox,and the tool-of-choice to study the fundamental nature of bulk oxygen states.

关 键 词：软X射线光谱 锂离子电池材料 电子结构 阳离子氧化还原反应 阴离子氧化还原反应 

分 类 号：O646[理学—物理化学]