All‐solid‐state batteries (ASSB) are currently developed at high pace and show a strong potential for market introduction within the next years. Though their performance has improved considerably over the last years, investigation of their sustainability and the development of suitable recycling strategies have received less attention. However, their potential for efficient circular processes must be accessed comprehensively. In this article, the separation of the solid electrolyte β‐Li₃PS₄ from different lithium transition metal oxide electrode materials (LiCoO₂, LiMn₂O₄, LiNi_0.8Mn_0.1Co_0.1O₂, LiFePO₄, LiNi_0.8Co_0.15Al_0.05O₂, and Li₄Ti₅O₁₂) are investigated via an approach based on the dissolution and subsequent precipitation of the thiophosphate using N‐methylformamide as solvent. A combination of X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, inductively coupled plasma mass spectrometry, iodometric titration, and X‐ray photoelectron spectroscopy as well as electrochemical impedance spectroscopy and electrochemical characterization is used to characterize the electrolyte and electrode materials before and after separation. Herein, it is found that the presence of electrode materials in the dissolution process can lead to significant chemical reactions. These interactions can (but most not) lead to strong alteration of the electrochemical characteristics of the individual compounds. Thus, it is shown that an efficient recovery of materials likely depends on the precise material combination within an ASSB.

Despite extensive research in the field of all‐solid‐state batteries, there has been limited attention to their recycling, which is crucial for achieving long‐term sustainability. Different electrolyte and electrode combinations must be considered for the recycling of these batteries, each requiring a detailed investigation of potential recycling approaches. The halide‐based solid electrolyte, Li ₃ InCl ₆ , has attracted significant attention due to its high‐room‐temperature lithium‐ion conductivity and its ability to recover its initial crystal structure after dissolution in water without significant electrochemical deterioration. This structural reversibility could potentially enable a direct recycling approach, allowing for the separation of the electrolyte from active electrode materials when dissolved in H ₂ O. To assess the recycling compatibility, the interactions of Li ₃ InCl ₆ with different electrode materials (Li ₄ Ti ₅ O ₁₂ , LiCoO ₂ , LiMn ₂ O ₄ , carbon‐coated LiFePO ₄ , LiNi _0.8 Mn _0.1 Co _0.1 O ₂ , and LiNi _0.8 Co _0.15 Al _0.05 O ₂ ) are studied during dissolution. Interactions arising from Lewis‐acid and Lewis‐base reactions can be identified using a combination of X‐ray diffraction, X‐ray photoelectron spectroscopy, and inductively coupled plasma mass spectrometry. Depending on the material combination, these interactions significantly impact the electrochemical properties of both recycled Li ₃ InCl ₆ and the electrode materials compared to the pristine samples.

Porous metallopolymer membranes are prepared via the self-assembly and non-solvent-induced phase separation (SNIPS) process. These membranes efficiently remove (transition)metal ions and perfluorinated organic substances from the water phase.

In the context of the safe storage of high-level radioactive waste, the time-dependent retention of a waste cocktail (WC) consisting of Zr(IV), Mo(VI), Ru(III), Pd(II), Cs(I), Sm(III), Eu(III) and U(VI) was studied on the commercially available C-S-H phase Circosil^®. The herein presented results focus on Cs(I), Sm(III), Eu(III) and U(VI). Precipitation and wall adsorption studies in the absence of the solid phase show only a small amount of precipitation for Sm(III) and Eu(III) (34 ± 18%) in the high-saline diluted Gipshut solution (DGS, pH 10.6, I = 2.6 M). For Cs(I) and U(VI), no precipitation was observed. In 0.1 M NaCl (pH 10.9), the measured retention could completely be attributed to wall adsorption for all four elements. The obtained R_d values for the time-dependent retention of Sm(III), Eu(III) and U(VI) on Circosil^® of 10⁵ to 10⁶ L·kg⁻¹ are in good agreement with the literature. For Cs(I) in the strongly saline background electrolytes, slightly higher R_d values of up to 8·10² L·kg⁻¹ were determined for the crystalline Circosil^® compared to the wet chemical C-S-H phases. Overall, the commercial product Circosil^® is suitable as an alternative to synthesised C-S-H phases to observe trends in the retention behaviour of these elements. Comparison between both background electrolytes shows an increase in the amount and velocity of retention for all four elements with decreasing salinity. This confirms adsorption processes as the fastest and initial retention mechanism. Precipitation or incorporation of Eu(III), Sm(III) and U(VI) cannot be ruled out in the long term. Comparing the kinetic of this WC study to single-element studies in the literature, a longer uptake time to reach a steady state of 7 d in 0.1 M NaCl and 28 d in DGS instead of <1 d was observed for Eu(III) and Sm(III). The situation for Cs(I) is similar. This indicates competing effects between the different WC elements for adsorption sites on the C-S-H phases.