Journal
NANO ENERGY
Volume 80, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105589
Keywords
Li-ion battery; Glass anode; NMR; Structure evolution; Nanodomains; Electrochemical performances
Categories
Funding
- National Natural Science Foundation of China [51402156, 61675218]
- Shandong Provincial Key Project Funding [2018YFJH0402]
- Colleges and Universities Twenty Terms Foundation of Jinan City [2019GXRC034]
- Foundation from State Key Laboratory of Special Glass of China
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This study used solid-state nuclear magnetic resonance to investigate the local structural evolution of a glass anode for Li-ion batteries during cycling, revealing the formation of different types of nano-domains that are beneficial for battery performance. By studying the detailed redox reactions, the researchers proposed a chemical principle for designing stable glass electrodes for high-performance LiBs.
Recently it has been demonstrated that the electrochemical performances of semiconducting amorphous anodes for Li-ion batteries (LIBs) can be greatly enhanced by the discharging/charging induced nanocrystals. However, the structural origin of those nano-domains remains elusive, although it is critically important for designing superior glass anodes for LIBs. In this work, we probe the local structural evolution in a glass anode for LIBs during cycles by means of the state-of-the-art solid-state nuclear magnetic resonance (SSNMR). The structural evolution is manifested as the disassociation of the structural network into isolated units, followed by formation of different types of nano-domains with a high degree of order. These domains are highly favorable for rate capability and long-term cycling stability. From SSNMR and electrochemical characterizations, we have obtained a clear picture about the detailed redox reactions. These findings provide a chemical principle that is helpful for designing the stable glass electrodes for high-performance LiBs.
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