Significant Improvement in Dissolving Lithium-Ion Battery Cathodes Using Novel Deep Eutectic Solvents at Low Temperature

Abstract

Mild and green dissolution of lithium cobalt oxide (LCO) with high efficiency is challenging. Here, novel DESs based on poly­(ethylene glycol) 200 and p-toluenesulfonic acid monohydrate are designed and found to dissolve LCO with nearly a 100% leaching efficiency at 100 °C within 24 h, which is much higher than the leaching efficiency by DESs in the reported references. The dissolution mechanism investigation shows that the interaction between DESs and LCO is a physical process. This work provides a new strategy for the mild and efficient dissolution of LCO by cheap and green solvents.

Thermal, chemical, electrochemical, radiolytic and biological stability of ionic liquids and deep eutectic solvents

“…such as thermal separation/conversion, electrochemical catalysis, material synthesis, energy storage, catalysis, biological applications and biochemistry. [3][4][5][6][7][8][9][10][11] For example, a high leaching efficiency (490%) of Co and Li from LiCoO 2 by DESs could only be achieved at high temperature (4180 1C) for 24 h. 11 The selective conversion of CO 2 into CH 4 could be achieved in IL media under visible light irradiation for 10 h. 3 A high faradaic efficiency for the electrochemical conversion of CO 2 to CH 4 and CO could be obtained at À2.2 V vs. Ag/Ag + in ILs. 12 These applications are powered by heat, chemical energy, electricity, and light or exposure to microorganisms.…”

“…Thus, the design of controllable degradable ILs and DESs under special conditions will be favorable. (9) Impurities in ILs and DESs should be determined before the analysis of their stability. The effect of impurities on their stability is obvious.…”

Decomposition of Deep Eutectic Solvent Aids Metals Extraction in Lithium‐Ion Batteries Recycling

“…Recently, attracted by these peculiarities, researchers have extended the application of DESs to the recycling of LIBs as metal leaching agents [5] . Different combinations of hydrogen bond donor and hydrogen bond acceptor in DES formulation were tested with the aim to maximize the metal extraction yields [4,6–11] . However, despite this interest of the scientific community, only very few studies attempted to develop a description of the mechanisms driving the dissolution of metal oxides in the employed DESs [12,13] .…”

A Weak Acidic and Strong Coordinated Deep Eutectic Solvent for Recycling of Cathode from Spent Lithium‐Ion Batteries

“…[20] PEG/p-toluenesulfonic acid [21] 60 °C, 24 Leaching efficiencies of LCO up to 99.5%. Table S2 shows a comparation of the leaching efficiencies of LA/GHC with other reported DES.…”