What question did this study set out to answer?

To systematically investigate the dissolution behaviors of manganese and nickel in high-voltage LiNi0.5Mn1.5O4 electrodes and determine the chemical mechanisms responsible for full-cell capacity fading.

July 12, 2013The Journal of Physical Chemistry C

Understanding Transition-Metal Dissolution Behavior in LiNi0.5Mn1.5O₄ High-Voltage Spinel for Lithium Ion Batteries

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Authors

NPNicholas P. W. PieczonkaGeneral Motors (United States)ZLZhongyi LiuZhengzhou University PLPeng LuChangzhou University

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Implication

Experimental study demonstrates transition-metal dissolution mechanisms in high-voltage lithium-ion batteries, highlighting chemical pathways driving capacity loss.

Key Points

To systematically investigate the dissolution behaviors of manganese and nickel in high-voltage LiNi0.5Mn1.5O4 electrodes and determine the chemical mechanisms responsible for full-cell capacity fading.
Examined Mn and Ni dissolution under varying states of charge, operating temperatures, storage durations, and crystal structures.
Characterized calendar- and cycle-aged LNMO and graphite electrode surfaces using X-ray photoelectron spectroscopy, transmission electron microscopy, and time-of-flight secondary ion mass spectrometry.
Identified electrolyte decomposition byproducts after storage using gas chromatography analysis.
Dissolved Mn and Ni concentrations alongside diethyl ether electrolyte decomposition products increased with higher state of charge, elevated temperatures, and longer storage times.
Electrolyte oxidation driven by LNMO self-discharge produces hydrofluoric acid during diethyl ether formation, which directly accelerates transition-metal dissolution.
Surface precipitation of LiF, MnF2, NiF2, and polymerized organic species on aged LNMO electrodes resulted in increased battery-cell impedance.

Cite This Study

Pieczonka et al. (2013) studied this question.

synapsesocial.com/papers/6a01f8a6e8ec6bd19dcb1248 https://doi.org/10.1021/jp405158m

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Implication

Experimental study demonstrates transition-metal dissolution mechanisms in high-voltage lithium-ion batteries, highlighting chemical pathways driving capacity loss.

Understanding Transition-Metal Dissolution Behavior in LiNi0.5Mn1.5O₄ High-Voltage Spinel for Lithium Ion Batteries

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Key Points

Cite This Study

Understanding Transition-Metal Dissolution Behavior in LiNi0.5Mn1.5O₄ High-Voltage Spinel for Lithium Ion Batteries

Discussion

Member takes

Implication

Key Points

Cite This Study

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