锂离子电池电极材料表界面结构的原子尺度表征-中国材料进展

文章信息/Info

Title:: The Atomic-scale Characterization of Structure and Interface of Electrode Materials of Lithium-ion Batteries

Author(s):: TONG Yuxin; ZHANG Qinghua; GU Lin; Institute of Physics, Chinese Academy of Sciences

Keywords:: Lithium-ion batteries; aberration-corrected scanning transmission electron microscopy; atomic scale surface and interface structure; electrochemical reaction mechanism; the phase transition of surface; interface.

摘要:: 锂离子电池充放电过程中，锂离子的传输要穿过多种表面和界面，表界面的性质对电池的功率密度、能量密度、充放电效率、使用寿命、循环性等特性具有重要的影响。表界面一般具有与体相不同的结构，在原子尺度上直接观察不同电化学状态下电极表界面的结构，有助于从更深层次认识电化学反应机理和性能演化规律，对于改善锂离子电池性能具有重要的指导意义。本文阐述了球差校正透射电子显微成像技术在研究电极材料表界面结构原子尺度研究中的应用，介绍了特殊的相界面、SEI、表面相变、表面掺杂等，探讨了表界面原子尺度结构与性能的内在关联，提出了改善电池性能的针对性建议，并对锂离子电池未来的发展从提高能量密度、避免固液界面副反应和改善电池性能三个方面进行了展望。

Abstract:: Lithium-ion is transferred through a variety of surfaces and interfaces in Lithium-ion batteries during the process of charging and discharging. The properties of surface and interface of electrode have great influence on the power density, energy density, the efficiency of charging and discharging, service life, cycling stability. In general, the structure of surface and interface of material are different from that of bulk, direct observation upon atomic-scale structure of electrode in different electrochemical state contributes to studying electrochemical reaction mechanism and evolution of properties and is of instructive significance to improve the properties of Lithium-ion batteries. In this paper , we review the recent progress in investigations of surface and interface structure of electrode materials, introduce special interface, SEI, the phase transition of surface and doping of surface, discuss the inherent correlation between the atomic-scale structures of surface and interface of electrode materials and their performance, raise some advises to improve the performance of Lithium-ion batteries and look forward to the development of Lithium-ion batteries in the aspect of increasing of energy density ,averting side reaction of solid electrode and liquid electrolyte and properties improvement.