Fig. 1

Structure diagrams of DILs and MILs"

Table 1

Common anions, cations and link groups in DILs"

阳离子	连接基团	阴离子

Fig. 2

Synthesis of symmetric DILs linked with alkyl chain"

Fig. 3

Synthetic route of dichloride salt [m-C6H4 (CH2ImMe)2] Cl2[ 36]"

Fig. 4

Synthesis of DILs [ 38]"

Fig. 5

(a) Comparative C 1?s XPS spectra of graphite electrodes with IL and without IL after 10 cycles; (b) P 2p XPS spectra of graphite electrodes with IL and without IL after 10 cycles; (c) F 1?s XPS spectra of graphite electrodes with IL and without IL after 10 cycles [ 46]"

Fig. 6

(a) Thermogravimetric analysis curves of three DILs; (b) Electrochemical impedance spectroscopy(EIS); (c) Electrochemical stability window of DILs; (d) Cycling test [ 47]"

Fig. 7

(a) Molecular structures and nomenclature of DILs; (b) Rate performance at 60 ℃; (c) The charge-discharge test of IL-1 electrolyte at 0.2 C [ 48]"

Fig. 8

(a) Molecular structures and nomenclature of the synthesized asymmetrical imidazolium-trialkylammonium dicationic; (b) Thermogravimetric curves of three DILs; (c, d) Comparison of rate and cycling performance [ 49]"

Fig. 9

(a) Graphical illustration and chemical configuration of the dicationic imidazolium-based cross-linker, XVIm-TFSI; (b) Schematic diagram for the roll-to-roll assembly of a Li||LiFePO4 cell; (c) Preparation and schematic display of the electrolyte [ 50]"

Fig. 10

(a) Photographs of the PVT-EMIMTFSI electrolytes during the self-healing process; (b) the electrochemical window of PVT-EMIMTFSI electrolytes; (c) the cycling stabilities of Li/PVT-45%EMIMTFSI/LiFePO4 cells at room temperature;[ 51](d) the mechanical properties of DPIL-6-SPE at different repairing time; (e) the cycling performance of LiFePO4/DPIL-6-SPE/Li batteries at 0.1 C at 60 ℃ [ 52]"

Fig. 11

Figure (left) shows the comparative CV of the device at the 1st and 10000th charge discharge cycle; (Right) inset shows the comparative charge discharge plot for the normal device and devices after complete bending and subsequent relaxing [ 55]"