Observation of preferential sputtering of Si/graphite anodes from Li-ion cells by GD-OES and its validation by neutron depth profiling

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00583172" target="_blank" >RIV/61389005:_____/24:00583172 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.jpowsour.2023.233972" target="_blank" >https://doi.org/10.1016/j.jpowsour.2023.233972</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jpowsour.2023.233972" target="_blank" >10.1016/j.jpowsour.2023.233972</a>

Result language
angličtina
Original language name
Observation of preferential sputtering of Si/graphite anodes from Li-ion cells by GD-OES and its validation by neutron depth profiling
Original language description
Although the loss of Li inventory (LLI) is a common aging mechanism in Li-ion batteries, there are only few methods capable of comprehensive depth profiling within the bulk of the electrode to locate the residual Li. Two post-mortem analytical methods, which can be used to obtain quantified Li depth profiles to depths greater than 10 mu m from the electrode surface are neutron depth profiling (NDP) and glow discharge optical emission spectroscopy (GD-OES). In this work, the validation of GD-OES using NDP by examining the Si/graphite anodes of cylindrical 21700 cells is presented. One anode was in a pristine/fresh state, two anodes were aged to the state of health (SOH) 90% and 76% at 45 C-degrees respectively, and suffered from heavy solid electrolyte interphase (SEI) growth, and the fourth anode was aged to SOH 60% at 0 C-degrees and exhibited Li plating. It is demonstrated that Li plating leads to a faster sputter rate of the Li-rich anode surface. An adapted method is introduced to incorporate the changing sputter rate into the depth profile calculation. For the aged anodes, the progressive aging of the anodes leads to a higher amount of irreversibly bound Li on the anode surface.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project
<a href="/en/project/EF16_013%2F0001812" target="_blank" >EF16_013/0001812: Center of Accelerators and Nuclear Analytical Methods - OP</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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