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Nanostructure-Mediated Phase Evolution in Lithiation/Delithiation of Co3O4
Yu Fu1, Xuyun Guo2, Zhenglong Xu3
1School of System Design and Intelligent Manufacturing, Southern University of Science and Technology, Xueyuan Road 1088, Shen Zhen, Guang Dong 518055, China.
ACS Applied Materials & Interfaces
|June 10, 2021
Summary
Nanostructured cobalt oxide anodes exhibit distinct lithiation mechanisms based on their structure, impacting lithium-ion battery performance. Understanding these nanostructure-dependent pathways is crucial for designing advanced battery electrodes.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Nanostructured transition-metal oxides are promising for next-generation lithium-ion batteries (LIBs).
- The precise role of nanostructures in influencing LIB performance is not fully understood.
- Cobalt oxide (Co3O4) is a key material being investigated for anode applications.
Purpose of the Study:
- To elucidate the nanostructure-mediated lithiation mechanism in Co3O4 anodes.
- To investigate how different nanostructures (nanosheets vs. nanoarrays) affect the lithiation process.
- To correlate lithiation mechanisms with lithium storage performance and structural stability.
Main Methods:
- Utilized *ex situ* transmission electron microscopy (TEM) to observe structural changes.
- Employed X-ray diffractometry to analyze phase evolution during lithiation.
- *In situ* TEM and galvanostatic discharge-charge measurements were used to monitor real-time performance and failure.
Main Results:
- Co3O4 nanosheets showed a two-step conversion (Co3O4 -> CoO -> Co0).
- Co3O4 nanoarrays exhibited a direct one-step conversion (Co3O4 -> Co0) at high discharge rates.
- Nanoarrays displayed slower lithiation kinetics, leading to inhomogeneous expansion, stress, and capacity loss.
Conclusions:
- Lithiation mechanisms in Co3O4 anodes are dependent on nanostructure morphology.
- Slow kinetics in nanoarrays at high rates can induce one-step conversion and structural failure.
- Findings offer critical insights for designing robust Co3O4 anodes for improved LIBs.
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