Revealing the structure design of alloyed based electrodes for alkali metal ion batteries with in situ TEM

作者：Huang, Huawen; Bi, Ran; Cui, Jie; Hu, Ming-Ming^*; Tian, Li; Yang, Xianfeng^*; Zhang, Lei^*

来源：Journal of Energy Chemistry, 2021, 59: 405-418.

DOI：10.1016/j.jechem.2020.11.0272095-4956/

• In situ TEM
• Alloyed based anode
• Nanostructure design
• Alkali metal ion batteries

Alloyed based anode materials with high theoretical specific capacity and low reaction potential are con-sidered to be highly potential high-energy density anode materials for alkali metal ion batteries (AMIBs). Thus, the design of alloyed based materials with high electrochemical performance has attracted great attention. Among the numerous characterization methods for guiding electrode materials design, in situ transmission electron microscopy (TEM) gradually plays an irreplaceable role due to its high tem-poral and spatial resolution in directly observing the change of morphology, crystal structure and ele-ment evolutions. Herein, we reviewed the two current research hotspots and mainly focused on the structure design of alloyed based electrode material under the guidance of in situ TEM. Specifically, var-ious nanostructure designs of alloyed based electrode materials with guidance of in situ TEM were employed to solve the key scientific issues of the violent volume change during alloying/dealloying pro -cesses for enhanced electrochemical performances. Mainly through introducing buffer space in the elec-trode material to reduce volume change to improve structural stability, including porous structure (0D), nanotube structure (1D), simple hollow structure, yolk-shell structure and some hybrid hollow structures (3D). Furthermore, the direct guidance of in situ TEM is expected for creating new opportunities to next -generation electrode material design for AMIBs.

• 单位
  湖南科技大学