Journal
ADVANCED ENERGY MATERIALS
Volume 13, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202204077
Keywords
accurate electrochemical behaviors; high-capacity electrodes; lithium-ion batteries; three-electrode configuration
Ask authors/readers for more resources
Developing high-capacity electrodes requires accurate evaluation of electrochemical behaviors under increasing current density. The polarization at the lithium counter electrode has become a barrier for accurate evaluation of battery electrodes. In this study, the impact of the lithium counter electrode was minimized by decoupling the electrochemical behavior of high-capacity electrodes using a single-channel three-electrode vehicle. The accurate evaluations revealed excellent rate capability and stable cycling performance of the high-capacity graphite electrode.
Developing high-capacity electrodes requires the evaluation of electrochemical behaviors with an increasing current density. Currently, the current density for evaluation of high-capacity electrodes has reached a new stage where the polarization at the lithium counter electrode has become a technical barrier for the accurate evaluation of battery electrodes, resulting in severe performance and mechanism mischaracterizations. Here, the accurate electrochemical behavior for high-capacity electrodes via a single-channel three-electrode vehicle is decoupled, by which the impact of lithium counter electrode is minimized. The testing high-capacity graphite electrode is capable of delivering an excellent rate capability with 81.7% capacity retention at 0.3 C, as well as stable cycling performance retaining 97.5% practical reversible capacity after 225 cycles, much higher than the graphite electrode tested with traditional half-cell testing vehicle but in close agreement with the results obtained from a well-matched full cell, reflecting accurate electrochemical performance evaluations of high-capacity electrodes. Moreover, detailed electrochemical mechanisms of impedance and diffusion properties for working electrodes are also successfully decoupled individually. This work uncovers the mismatch between traditional evaluation configuration and increasing testing current density and provides a guideline for accurate electrochemical evaluation for ever-increasing high-capacity electrodes, which is of great significance for high-energy lithium or other alkali-metal ion batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available