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Operando characterization of cathodic reactions in a liquid-state lithium-oxygen micro-battery by scanning transmission electron microscopy.


ABSTRACT: Rechargeable non-aqueous lithium-oxygen batteries with a large theoretical capacity are emerging as a high-energy electrochemical device for sustainable energy strategy. Despite many efforts made to understand the fundamental Li-O2 electrochemistry, the kinetic process of cathodic reactions, associated with the formation and decomposition of a solid Li2O2 phase during charging and discharging, remains debate. Here we report direct visualization of the charge/discharge reactions on a gold cathode in a non-aqueous lithium-oxygen micro-battery using liquid-cell aberration-corrected scanning transmission electron microscopy (STEM) combining with synchronized electrochemical measurements. The real-time and real-space characterization by time-resolved STEM reveals the electrochemical correspondence of discharge/charge overpotentials to the nucleation, growth and decomposition of Li2O2 at a constant current density. The nano-scale operando observations would enrich our knowledge on the underlying reaction mechanisms of lithium-oxygen batteries during round-trip discharging and charging and shed lights on the strategies in improving the performances of lithium-oxygen batteries by tailoring the cathodic reactions.

SUBMITTER: Liu P 

PROVIDER: S-EPMC5816613 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Operando characterization of cathodic reactions in a liquid-state lithium-oxygen micro-battery by scanning transmission electron microscopy.

Liu Pan P   Han Jiuhui J   Guo Xianwei X   Ito Yoshikazu Y   Yang Chuchu C   Ning Shoucong S   Fujita Takeshi T   Hirata Akihiko A   Chen Mingwei M  

Scientific reports 20180216 1


Rechargeable non-aqueous lithium-oxygen batteries with a large theoretical capacity are emerging as a high-energy electrochemical device for sustainable energy strategy. Despite many efforts made to understand the fundamental Li-O<sub>2</sub> electrochemistry, the kinetic process of cathodic reactions, associated with the formation and decomposition of a solid Li<sub>2</sub>O<sub>2</sub> phase during charging and discharging, remains debate. Here we report direct visualization of the charge/disc  ...[more]

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