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Achieving High Capacity in Nickel-Rich Cathodes via Low-Voltage Lithium Storage Expansion
Junliang Du1,2,3, Mengqi Wang1,2,3, Yuxin Du2
1State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 18, 2026
Summary
A novel constant-capacity protocol enhances lithium-ion battery performance by accessing low-voltage lithium storage in nickel-rich cathodes. This method improves cycling stability and energy density while mitigating structural degradation for next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Nickel-rich layered oxides offer high cathode capacity but suffer from poor stability.
- Lithium-excess configurations at low voltages are challenging due to degradation.
Purpose of the Study:
- To develop a protocol for stable high-capacity operation of lithium-excess nickel-rich cathodes.
- To improve cycling stability and energy density in lithium-ion batteries.
Main Methods:
- Implementation of a constant-capacity (CCap) cycling protocol.
- Utilizing Li||NCM811 half-cells and full cells for testing.
- Analysis using X-ray diffraction (XRD).
Main Results:
- CCap protocol significantly enhances cycling stability (up to 600 cycles).
- Capacity extension observed via formation of Li2-NCM811 phase from low-voltage regime.
- Achieved ~10% higher energy density compared to conventional cycling.
Conclusions:
- The CCap protocol effectively stabilizes lithium-excess cathodes.
- This strategy unlocks high capacity and improved energy density for next-gen batteries.
- Demonstrated long-term stability in full-cell configurations.
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