Intrinsically Nonflammable Ionic Liquid‐Based Localized Highly Concentrated Electrolytes Enable High‐Performance Li‐Metal Batteries

Abstract

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Advanced Electrolyte Design for High‐Energy‐Density Li‐Metal Batteries under Practical Conditions

“…Basile et al investigated Li deposition in several kinds of ionic-liquid-based electrolytes for Li-metal batteries.Along cycle stability over 5000 ho fL i k Li symmetry was achieved in 1M LiAsF 6 [C3mPyr + ][FSI -] electrolytes. [127] Unfortunately,t he high viscosity and low ionic conductivity of the of ionic liquids at room temperature hinder its practical applications.A saresult, the specific capacity of Li k LiFePO 4 full cells is only 80 mAh g À1 with 1M LiAsF 6 [C3mPyr + ][FSI -]e lectrolytes.H ence,s ome co-solvents such as DOL/DME [125,128] or HFE [129] are added to the ionic liquid to decrease the viscosity.W ang et al demonstrated the synergic effect of LiNO 3 and an ionic liquid to suppress the dissolution of polysulfides (Figure 10 A). [125] Guo et al reported 2M LiTFSI PP13TFSI/DOL/DME(1:1:1) as the electrolyte for Li-metal batteries with ahigh CE of 98 % (Figure 10 B).…”

“…[128] Xu et al employed HFE as diluent for an ionic-liquid-based electrolyte to form LHCE. [129] Some novel ionic liquids have been also proposed for Limetal batteries.Dai et al reported aNa-chelated ionic liquid for Li-metal batteries (Figure 10 C). [130] After Na chelation, the viscosity of the ionic liquid decreased.…”

Advanced Electrolyte Design for High‐Energy‐Density Li‐Metal Batteries under Practical Conditions

“…As a result, the specific capacity of Li∥LiFePO 4 full cells is only 80 mAh g −1 with 1 M LiAsF 6 [C3mPyr + ][FSI ‐ ] electrolytes. Hence, some co‐solvents such as DOL/DME [125, 128] or HFE [129] are added to the ionic liquid to decrease the viscosity. Wang et al.…”

Mechanism understanding for stripping electrochemistry of Li metal anode

“…Numerous methods have been proposed to address these problems including electrolyte additives, [34][35][36][37][38][39][40][41][42][43][44][45] artificial SEI, [46][47][48][49][50][51][52][53][54][55][56] superconcentrated electrolyte, [57][58][59][60][61][62][63][64][65][66][67][68][69][70] solid-state electrolyte (SSE), [71][72][73][74][75][76][77][78][79][80] functional membrane, [81][82][83][84]…”