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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
Published on: November 10, 2014
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Correlation between manganese dissolution and dynamic phase stability in spinel-based lithium-ion battery.
Tongchao Liu1,2, Alvin Dai2, Jun Lu3
1School of Advanced Materials, Peking University, Shenzhen Graduate School, 518055, Shenzhen, China.
Nature Communications
|October 19, 2019
Summary
Transition metal dissolution and structural changes in lithium manganese oxide cathodes cause capacity fading. Modifying lithium manganese oxide with lithium/manganese disorder and surface reconstruction can improve battery lifespan.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Transition metal dissolution is a known cause of anode degradation.
- Its specific impact on cathode behavior, particularly in lithium manganese oxide (LiMn2O4), is not well understood.
Purpose of the Study:
- To investigate the correlation between capacity fading and the phase/surface stability of LiMn2O4 cathodes.
- To elucidate the mechanisms driving cathode degradation and identify strategies for improvement.
Main Methods:
- Analysis of structural transformations and phase transitions in LiMn2O4.
- Investigation of manganese dissolution and its link to structural evolution.
- Evaluation of surface reconstruction and lithium/manganese disorder effects.
Main Results:
- Capacity fading in LiMn2O4 is dominated by a combination of structural transformation and manganese dissolution.
- Irreversible phase transitions, driven by manganese disproportionation and Jahn-Teller distortion, lead to particle cracking and manganese dissolution.
- Manganese dissolution accelerates irreversible structural evolution, creating a detrimental cycle.
- Lithium-rich LiMn2O4 with specific modifications suppresses these degradation pathways.
Conclusions:
- The study clarifies the coupled mechanisms of structural instability and transition metal dissolution in LiMn2O4 cathode degradation.
- Strategies like introducing lithium/manganese disorder and surface reconstruction can enhance cathode stability and battery longevity.
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