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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Dynamics of particle network in composite battery cathodes
Jizhou Li1, Nikhil Sharma2, Zhisen Jiang1
1Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
Science (New York, N.Y.)
|April 28, 2022
Summary
Understanding battery electrode performance requires studying active materials and conductive networks. This research models particle behavior, revealing how network heterogeneity impacts electrochemical activity and mechanical damage for better battery designs.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Composite battery electrodes rely on the interaction between active materials and conductive networks for efficient energy storage.
- Controlling active material formulation is crucial for optimizing electrode performance and longevity.
- Understanding the interplay between electrochemical activity and mechanical integrity of electrode particles is essential.
Purpose of the Study:
- To develop a network evolution model for interpreting the regulation and equilibration between electrochemical activity and mechanical damage in electrode particles.
- To analyze the behavior of individual particles within a composite electrode structure.
- To provide insights for designing improved conductive networks in batteries.
Main Methods:
- Formulation of a network evolution model.
- Statistical analysis of thousands of particles using x-ray phase contrast holotomography.
- Investigation of a lithium nickel manganese cobalt oxide (LiNi0.8Mn0.1Co0.1O2)-based cathode.
Main Results:
- Local network heterogeneity leads to asynchronous electrochemical activity in early battery cycles.
- Particle assemblies transition towards synchronous behavior over operational cycles.
- Chemomechanical behavior of individual particles was pinpointed.
Conclusions:
- The study elucidates the relationship between network structure, particle activity, and mechanical stability in composite electrodes.
- Optimizing conductive network design can enhance the utilization of active materials.
- This research enables improved battery electrode designs for better operational efficiency.
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