Details

Autor(en) / Beteiligte

• Li, Songjie
• Gao, Jiazhe
• Ou, Yinjun
• Liu, Xuehua
• Yang, Liting
• Cheng, Yifeng
• Zhang, Jincang
• Wu, Liming
• Lin, Chunfu
• Che, Renchao

Titel

Temperature Effects on Electrochemical Energy‐Storage Materials: A Case Study of Yttrium Niobate Porous Microspheres

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2023-11, Vol.19 (48), p.e2303763-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Lithium‐ion batteries (LIBs) are very popular electrochemical energy‐storage devices. However, their applications in extreme environments are hindered because their low‐ and high‐temperature electrochemical performance is currently unsatisfactory. In order to build all‐climate LIBs, it is highly desirable to fully understand the underlying temperature effects on electrode materials. Here, based on a novel porous‐microspherical yttrium niobate (Y0.5Nb24.5O62) model material, this work demonstrates that the operation temperature plays vital roles in electrolyte decomposition on electrode‐material surfaces, electrochemical kinetics, and crystal‐structure evolution. When the operation temperature increases, the reaction between the electrolyte and the electrode material become more intensive, causing the formation of thicker solid electrolyte interface (SEI) films, which decreases the initial Coulombic efficiency. Meanwhile, the electrochemical kinetics becomes faster, leading to the larger reversible capacity, higher rate capability, and more suitable working potential (i.e., lower working potential for anodes and higher working potential for cathodes). Additionally, the maximum unit‐cell‐volume change becomes larger, resulting in poorer cyclic stability. The insight gains here can provide a universal guide for the exploration of all‐climate electrode materials and their modification methods. The temperature effects on electrode materials are fully revealed through intensively investigating a novel yttrium niobate (Y0.5Nb24.5O62) model material with a large interlayer spacing and porous‐microspherical morphology. It is found that the operation temperature plays vital roles in electrolyte decomposition on electrode‐material surfaces (initial Coulombic efficiency), electrochemical kinetics (reversible capacity, rate capability, and working potential), and crystal‐structure evolution (cyclic stability).