Of note is the lack of fluoride impurities in these hydro-regenerated samples when compared with the direct solid-state regenerated samples. In order to evaluate whether the fluorine had been retained in the filtrate obtained after the treatment, this was evaporated and characterised with PXRD/SEM-EDX (Figure ). The results indicate the presence of Na2CO3 and NaF in the precipitate. This suggests that the hydroxide treatment has two additional benefits: 1) the hydroxide treatment decomposes the PVDF binder, therefore reducing the likelihood of fluorine contamination in the resultant LO samples; 2) Na2CO3 is generated as a by-product which could, if required, be used to precipitate Li from the solution as Li2CO3 once multiple fractions are combined.