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Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
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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
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
high-voltagelithium cobalt oxidelithium compensative additivelithium-ion batteriessilicon-based anode

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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.