Stabilizing 4.6 V LiCoO2 by Lithium Compensative Additives.
Jingwei Liu1,2,3, Shiqiang Zhong3, Fangchang Zhang3
1School of Undergraduate Education, Shenzhen Polytechnic University, Shenzhen 518055, P. R. China.
ACS Applied Materials & Interfaces
|February 19, 2025
Summary
Adding lithium compensative additive (LCA) Li2NiO2 to high-voltage lithium cobalt oxide/silicon batteries improves performance. This LCA stabilizes the cathode by compensating for lithium loss in the silicon anode.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-voltage lithium cobalt oxide (LiCoO2) and silicon (SiO2) full cells offer high energy density.
- Silicon anodes consume significant Li+ ions initially, causing lithium deficiency and degrading LiCoO2 at high voltages.
Purpose of the Study:
- To enhance the capacity and cycling stability of 4.6 V LiCoO2/SiO2 full cells.
- To investigate the mechanism of a sacrificial lithium compensative additive (LCA) for stabilizing high-voltage cathodes.
Main Methods:
- Addition of Li2NiO2 (LNO) as a lithium compensative additive (LCA).
- In situ X-ray diffraction (XRD), in situ Raman spectroscopy, and transmission electron microscopy (TEM) for mechanistic studies.
Main Results:
- LNO effectively improved the capacity and cycling performance of the LiCoO2/SiO2 full cell.
- LNO irreversibly released Li+ ions, altering the delithiation equilibrium of LiCoO2.
- Mitigation of lithium-deficient layer formation on LiCoO2 was observed.
Conclusions:
- Lithium compensative additives (LCAs) are a promising strategy for stabilizing high-voltage cathodes in lithium-deficient battery systems.
- This approach offers insights for improving other cathode materials operating at high voltages.
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