Sustainable Recycling of Spent Ionic Liquid Dual‐Ion Batteries

Abstract

Ionic liquid (IL) dual‐ion batteries (DIBs) are widely studied as advanced electrochemical systems because of their potential nonflammability, environmental friendliness, and high working voltage. Recycling and reusing valuable IL electrolytes and metallic Ni current collectors might boost the application of IL DIBs. Herein, the preliminary results of the recycling of a spent DIB with 1,2‐dimethyl‐3‐propylimidazolium chloroaluminate (DMPI+)(AlCl4−) electrolyte are reported. Recovery rates of most components (graphite flakes, Ni current collector, and so on) of the DIB reach a range of 84–98%, whereas the IL electrolyte is only 24%. Optimistically, the cost of an IL DIB using recycled components can be reduced by around 68%. Thus, developing the recycling processes might pave the way to increase the competitiveness of IL DIBs for grid‐scale energy storage.

Machine Learning-Driven Ionic Liquids as Electrolytes for the Advancement of High-Voltage Dual-Ion Battery

“…However, there is limited research on DIBs using organic moieties of imidazolium (1-ethyl-3-methyl imidazolium and 2,3-dimethyl-1-propyl imidazolium) and pyrrolidinium-based (N-butyl-Nmethyl pyrrolidinium) cations in the graphite anode. 30,32 Exploring DIBs with other organic moieties-based cations, like morpholium, piperidinium, and thiazolium, is challenging both computationally and experimentally due to the complexities of the ion intercalation process and the sensitivity of ILs. The intercalation of ions into the graphite electrode follows a proper staging mechanism, making computational studies time-consuming and costly.…”

“…Recent studies have shown that the organic moieties of imidazolium and pyrrolidinium-based cations and counteranions such as OTf (CF 3 SO 3 ), AlCl 4 , PF 6 , and BF 4 of ILs are intercalated into the graphite anode and cathode, respectively, during the charging process. − These DIBs show the higher cutoff changing voltage of 4.0–5.0 V, due to the broad electrochemical window of ILs. However, there is limited research on DIBs using organic moieties of imidazolium (1-ethyl-3-methyl imidazolium and 2,3-dimethyl-1-propyl imidazolium) and pyrrolidinium-based ( N -butyl- N -methyl pyrrolidinium) cations in the graphite anode. , Exploring DIBs with other organic moieties-based cations, like morpholium, piperidinium, and thiazolium, is challenging both computationally and experimentally due to the complexities of the ion intercalation process and the sensitivity of ILs. The intercalation of ions into the graphite electrode follows a proper staging mechanism, making computational studies time-consuming and costly.…”

Mechanistic insights into the solvent assisted thermal regeneration of spent graphite and its upcycling into dual graphite batteries

“…31,32,35 However, only a few reports are exclusively found on utilizing regenerated graphite as an anion-storing cathode material. [36][37][38][39][40][41][42] Therefore, this study investigates the electrochemical compatibility of the regenerated graphite as both the cathode and anode. Finally, a graphite-based dual-ion full cell is fabricated, and its electrochemical performances are rigorously optimized toward developing a practical prototype.…”