Journal
ADVANCED MATERIALS
Volume 35, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202210937
Keywords
batteries; intraparticle phase-separation; lithium iron phosphate; phase-separating materials; voltage hysteresis
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It is shown that the hysteretic behavior of phase-separating battery materials can be deeply entered with finite battery currents. This observation is related to the intraparticle phase-separated state of the active material and significantly affects the DC and AC characteristics of the battery. These findings will advance the understanding, control, diagnostics, and monitoring of batteries composed of phase-separating materials while motivating battery design and performance enhancement.
Hysteresis is a general phenomenon regularly observed in various materials. Usually, hysteretic behavior is an intrinsic property that cannot be circumvented in the nonequilibrium operation of the system. Herein, it is shown that, at least with regard to the hysteretic behavior of phase-separating battery materials, it is possible to enter (deeply) the hysteretic loop at finite battery currents. This newly observed electric response of the electrode, which is inherent to phase-separating materials, is related to its microscopic origin arising from a (significant) share of the active material residing in an intraparticle phase-separated state. This intriguing observation is further generalized by revealing that a phase-separating material can feature (significantly) different chemical potentials at the same bulk lithiation level and temperature when exposed to the same finite current and external voltage hysteresis. Therefore, the intraparticle phase-separated state significantly affects the DC and AC characteristics of the battery. The experimental evidence for entering the intraparticle phase-separated state is supported by thermodynamic reasoning and advanced modeling. The current findings will help advance the understanding, control, diagnostics, and monitoring of batteries composed of phase-separating materials while also providing pertinent motivation for the enhancement of battery design and performance.
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