Abstract
The primary advantages of Li ion batteries (LIBs) over traditional energy storage devices include high voltage, large capacity and stable cycling ability [1]. Despite their tremendous success in the market of portable devices and electric vehicles, people are developing next generation of batteries for large-scale energy storage or severe working environment, which demands LIBs with better cycling stability, safety and higher energy-density. Investigations on how Li ions transport through the components in a battery, such as anode, cathode, and electrolyte, would be helpful to understand the performances of LIBs, and therefore to realize reversible lithiation/delithiation during cycling.Transmission electron microscopy (TEM) is an indispensable tool in probing real-space local structures at atomic resolution. Recently, advanced TEM techniques have been applied into tracking the transportation of lithium ions in battery materials [2]. Emerging methods like ABF, e-ABF, iDPC, EELS and ptychography offer possibilities to atomically observe Li ions' occupations, identify their chemical environment, and track the dynamics of their insertion and extraction [3-6]. At present, cryo-TEM technique is a hot spot to study the solid-electrolyte interphase where Li contained organic or inorganic compounds are very beam sensitive [7]. In-situ TEM techniques have unparallel merits to track the migration of lithium ions or see the phase transmission of electrode materials [8-9]. In this talk, we introduce the techniques for direct observation of Li species and their research advances in LIB materials. Perspectives for the current challenges and future development to investigate Li-containing materials are discussed.
Published Version
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