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Inhibiting collective cation migration in Li-rich cathode materials as a strategy to mitigate voltage hysteresis
Jianping Huang1, Bin Ouyang1,2, Yaqian Zhang1,2
1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
Nature Materials
|January 26, 2023
Summary
Partially disordered lithium-rich cathodes can achieve high energy density by preventing collective transition metal migration, overcoming voltage hysteresis issues in energy storage devices.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-rich cathodes offer high energy densities for energy storage.
- Voltage hysteresis, linked to transition metal migration, hinders their efficiency.
Purpose of the Study:
- To investigate the relationship between collective metal ion migration and voltage hysteresis.
- To develop high-capacity, reversible cathode materials by controlling transition metal migration.
Main Methods:
- Investigated a layered Li-rich chromium manganese oxide.
- Introduced partial cation disorder to disrupt collective transition metal migration.
Main Results:
- Fully ordered materials showed significant voltage hysteresis (>2.5 V) due to collective migration.
- Partially disordered materials achieved high capacity (>360 mAh g⁻¹) and energy density (>1,100 Wh kg⁻¹).
Conclusions:
- Partial cation disordering mitigates voltage hysteresis by isolating migration events.
- This approach enables high-performance cathode materials with mobile cation redox couples.
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