Abstract
In-orbit satellite REIMEI, developed by the Japan Aerospace Exploration Agency, has been relying on off-the-shelf Li-ion batteries since its launch in 2005. The performance and durability of Li-ion batteries is impacted by various degradation mechanisms, one of which is the growth of the solid-electrolyte interphase (SEI). In this article, we analyse the REIMEI battery and parameterize a full-cell model with electrochemical cycling data, computer tomography images, and capacity fading experiments using image processing and surrogate optimization. We integrate a recent model for SEI growth into a full-cell model and simulate the degradation of batteries during cycling. To validate our model, we use experimental and in-flight data of the satellite batteries. Our combination of SEI growth model and microstructure-resolved 3D simulation shows, for the first time, experimentally observed inhomogeneities in the SEI thickness throughout the negative electrode for the degraded cells.
Highlights
Lithium-ion batteries are the technology of choice for various applications like laptops, smartphones and electric vehicles
Two identical batteries are connected in parallel on board of the satellite REIMEI, each consisting of seven pouch cells connected in series
The modeling is based on experimental work and in-flight data of the batteries of small scientific satellite REIMEI, which was developed by Japanese Aerospace Exploration Agency (JAXA)
Summary
Lithium-ion batteries are the technology of choice for various applications like laptops, smartphones and electric vehicles. Access to cells of the same kind than those used in the mission might be difficult For these reasons, it is essential to have physics-based models available, which can predict the performance and degradation of the cells for any given operation of the satellite. The major degradation process taking place in Li-ion batteries is the growth of the solid-electrolyte interphase (SEI) This passivation layer builds on the anode surface during the first cycles of the cell, when solvents from the electrolyte react with Li-ions and electrons. REIMEI is a small scientific satellite developed by the Japanese Aerospace Exploration Agency (JAXA) It was launched in 2005 with the main scientific mission to observe the aurora and demonstrate advanced satellite technology, one of which is Li-ion batteries that use off-theshelf pouch cells. In sec. 5 we determine the parameters of the degradation model and discuss the results of the degradation and SEI growth simulation
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