Effective suppression of lithium dendrite growth using fluorinated polysulfonamide-containing single-ion conducting polymer electrolytes

Abstract

A flexible artificial SEI layer with a 3D cross-linked network structure exhibits high ionic conductivity and single-ion conductive characteristics.

Single-Ion Conducting Polymeric Protective Interlayer for Stable Solid Lithium-Metal Batteries

“…Moreover, when the current density is switched back to 0.2 C, the capacity returns to the starting value, indicating the high stability of such a battery system (Figure a). More importantly, in Figure S15, the Li/PVEC/LFP cell with the SIPPI also exhibits excellent cycling stability with a retention capacity of 119 mAh g –1 (capacity retention: 86%) after 1000 cycles at 1 C, which has a longer cycle life than most of the reported polymer electrolyte-based cells. , Comparatively, the Li/PVEC/LFP cell with the DIPPI and Li/PVEC/LFP cell could not maintain stable charging/discharging behavior and show significant capacity fading after 260 and 120 cycles under the same conditions, respectively (Figures S15 and 16). High current density (2 C) is also utilized to evaluate Li/PVEC/LFP cells.…”

Single‐Ion Conducting Polymer Electrolytes for Solid‐State Lithium–Metal Batteries: Design, Performance, and Challenges

“…By comparison with common anions including SO 4 2− , PO 4 3− , etc., the ionic liquid‐typed anions have lower pairing strength and dissociation energy barrier with Li‐ions, which could enhance the transport of Li‐ions, reaching higher cationic conductivity. [ 30,31 ] Moreover, some other approaches, such as grafting organic anions on inorganic components to form hybrid inorganic–organic materials, applying anion acceptors to suppress the mobility of anions via Lewis acid–base interactions, have also been reported to synthesize polymer electrolytes with high cationic transference numbers, i.e., unconventional SICPEs (see Figure 1 ). [ 32,33 ]…”

Artificial Single-Ion Conducting Polymer Solid Electrolyte Interphase Layer toward Highly Stable Lithium Anode

“…Especially, the more stable and efficient artificial SEI layers with well-designed structure and component for protecting Li anode were positively applied. Although varieties of artificial SEI layers composed of inorganics (LiF, 17−20 Li 3 PO 4 , 21,22 Al 2 O 3 , 23 and Li 2 S 15,24 ), organics ([LiNBH] n , 10 LP, 12 LiPLA, 13 LiPAA, 25 APL, 26 PVDF, 27 COF-Li, 28 and LFPP-SEI 29 ), and organic− inorganic hybrids (LiF/LiSb@SBR, 30 EBC-LiTFSI, 31 PECA/ LiNO 3 , 32 and SiO 2 @PMMA 33 ) prepared via various casting methods have been reported, it is hard to fabricate an ideal artificial SEI layer which may possess the following desired comprehensive features: Li). First, LiSTFSI (0.5 mmol), PTMP (0.25 mmol), and DMPA (0.025 mmol) were mixed in GBL (3 mL) under ultraviolet (UV) light reacting for 10 min to get homogeneous solution A.…”

“…Especially, the more stable and efficient artificial SEI layers with well-designed structure and component for protecting Li anode were positively applied. Although varieties of artificial SEI layers composed of inorganics (LiF, − Li 3 PO 4 , , Al 2 O 3 , and Li 2 S , ), organics ([LiNBH] n , LP, LiPLA, LiPAA, APL, PVDF, COF-Li, and LFPP-SEI), and organic–inorganic hybrids (LiF/LiSb@SBR, EBC-LiTFSI, PECA/LiNO 3 , and SiO 2 @PMMA) prepared via various casting methods have been reported, it is hard to fabricate an ideal artificial SEI layer which may possess the following desired comprehensive features: (I) high ionic conductivity ensuring a fast Li + ions diffusion and transportation; (II) superior flexibility and machinability to accommodate the huge volume change of Li metal and avoid the puncture of lithium dendrite; (III) proper thickness and structure to induce the homogeneous Li stripping/plating behavior and charge distribution suppressing dendrite nucleation and growth; (IV) excellent chemical and electrochemical stability to stabilize the Li/electrolyte interface and support wide electrochemical window; and (V) uniform and rapid ion pathways to facilitate a facile single Li-ion diffusion. , …”