Revealing the onset condition of Li plating on graphite electrodes under fast-charging

Article Chemistry, Physical

Overpotential decomposition enabled decoupling of complex kinetic processes in battery electrodes

Ruoyu Xiong et al.

Summary: Identifying and decoupling overpotential components in electrochemical systems can provide crucial insights into the performance and optimization of batteries.

JOURNAL OF POWER SOURCES (2023)

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Article Chemistry, Physical

Decoupled measurement and modeling of interface reaction kinetics of ion-intercalation battery electrodes

Ruoyu Xiong et al.

Summary: The ultrahigh rate performance of active particles in lithium-ion battery electrodes has been revealed through single-particle measurements, indicating the potential for high-power battery development. However, traditional electrochemical kinetics cannot accurately describe the charging/discharging behaviors of ion-intercalation materials at ultrahigh C-rates, due to the coupling of interface reaction and solid-state diffusion processes. By decoupling the reaction and diffusion kinetics using time-resolved potential measurements, a new interface ion-intercalation reaction model is developed, enabling accurate prediction of charging/discharging at both particle and electrode scales for different active materials.

ENERGY STORAGE MATERIALS (2023)

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Article Chemistry, Physical

Combined dilatometry and voltage analysis for a reliable detection of lithium deposition on graphitic anodes

Leonard Jahn et al.

Summary: The study uncovers the impact of lithium deposition on cell voltage and thickness, demonstrating that dilation behavior and voltage analysis can be used to detect LD, proposing a Bayes algorithm for combined data detection.

JOURNAL OF POWER SOURCES (2022)

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Article Multidisciplinary Sciences

Extremely fast-charging lithium ion battery enabled by dual-gradient structure design

Lei-Lei Lu et al.

Summary: The poor rate capability of graphite anodes hampers the charging speed of lithium-ion batteries. This study presents a previously unreported dual-gradient structure design in the graphite anode, which improves the charging capability and achieves extremely fast-charging.

SCIENCE ADVANCES (2022)

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Article Chemistry, Physical

Gradient porosity electrodes for fast charging lithium-ion batteries

Jian Yang et al.

Summary: To address the issue of Li plating on the surface of thick graphite electrodes, an innovative gradient porosity architecture was proposed to facilitate mass transport and suppress Li plating. Experimental results showed that this structure significantly improved the performance and durability of the electrodes.

JOURNAL OF MATERIALS CHEMISTRY A (2022)

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Article Chemistry, Physical

Interplay of Lithium Intercalation and Plating on a Single Graphite Particle

Tao Gao et al.

Summary: Improving safety, increasing charging rates, and extending the lifetime of lithium-ion batteries is a major challenge, with the key being to control lithium plating on graphite anodes. Experimental studies have shown that the onset of plating is strongly coupled with phase separation in graphite, occurring only on the fully lithiated edges of particles. The competition between Li insertion and plating is further elucidated through energetics and kinetics analysis.

JOULE (2021)

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Article Chemistry, Physical

Overpotential analysis of graphite-based Li-ion batteries seen from a porous electrode modeling perspective

Zhiqiang Chen et al.

Summary: This study discusses the overpotential of Li-ion batteries and its influence on power and energy densities, introducing a method for decomposing the total overpotential using a P2D model. It shows that the four components of overpotential are strongly influenced by battery parameters and reaction-rate distribution within the porous electrode.

JOURNAL OF POWER SOURCES (2021)

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Article Chemistry, Physical

Model-based lithium deposition detection method using differential voltage analysis

Felix Katzer et al.

Summary: A novel model-based approach was developed to distinguish between normal and lithium deposition-affected relaxation processes during fast charging of lithium-ion batteries. This method enables the classification of charging processes based on accelerated aging, with remarkable sensitivity and automated detection of lithium deposition.

JOURNAL OF POWER SOURCES (2021)

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Article Chemistry, Multidisciplinary

3D Detection of Lithiation and Lithium Plating in Graphite Anodes during Fast Charging

Alec S. Ho et al.

Summary: The research found that during fast charging, mossy lithium metal forms a layer between the graphite electrode and separator, causing some graphite particles to be underlithiated. This lithium plating layer inhibits further lithiation of the underlying electrode.

ACS NANO (2021)

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Review Chemistry, Physical

Fast Charging of Lithium-Ion Batteries: A Review of Materials Aspects

Manuel Weiss et al.

Summary: Fast charging is essential for the economic success of electric vehicles, with lithium-ion batteries facing limitations due to the transport of lithium ions within the electrodes. Understanding these limitations is crucial for optimizing material properties for fast-charging applications.

ADVANCED ENERGY MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Detecting onset of lithium plating during fast charging of Li-ion batteries using operando electrochemical impedance spectroscopy

David E. Brown et al.

Summary: In this study, operando electrochemical impedance spectroscopy was used to reliably detect the onset of Li plating on graphite electrodes in three-electrode LIBs. By cross-validating with a highly sensitive ex situ chemical titration, it was determined that this technique can detect very small amounts of plated Li. This technique can also be applied to standard two-electrode LIB systems, making it an important step toward safely implementing fast charging protocols for LIBs in EVs.

CELL REPORTS PHYSICAL SCIENCE (2021)

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Article Chemistry, Physical

Operando video microscopy of Li plating and re-intercalation on graphite anodes during fast charging

Yuxin Chen et al.

Summary: This study used plan-view operando video microscopy to investigate lithium plating on graphite anodes in high-energy-density batteries. The results show that lithium plating mainly occurs on graphite particles and is correlated with local minimum of graphite electrode potential. Galvanic corrosion currents are responsible for lithium re-intercalation and dead lithium formation.

JOURNAL OF MATERIALS CHEMISTRY A (2021)

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Article Chemistry, Physical