Polymeric concentrated electrolyte enables simultaneous stabilization of electrode/electrolyte interphases for quasi‐solid‐state lithium metal batteries

Abstract

To achieve next-generation lithium metal batteries (LMBs) with desirable specific energy and reliability, the electrolyte shown simultaneously high reductive stability toward lithium metal anode and oxidative stability toward highvoltage cathode is of great importance. Here, we report for the first time that high-concentration lithium bis(fluorosulfonyl)imide (LiFSI) initiates ringopening polymerization of 1,3-dioxolane in presence of ethylene carbonate and ethylmethyl carbonate to produce in-situ a novel polymeric concentrated quasi-solid electrolyte (poly-CQSE). The unique poly-CQSE with 10 M LiFSI forms a mixed-lithiophobic-conductive LiF-Li 3 N solid electrolyte interphase on lithium metal anode, and a F-rich conformal cathode electrolyte interphase on LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode simultaneously. As a result, the poly-CQSE not only enables stable Li plating/stripping of metallic Li anode at a sound Coulombic efficiency of 95.3% without dendrite growth, but also enables a stable cycling of the LijjNCM523 quasi-solid-state LMB at a capacity retention of 94% over 100 cycles.

Nanocomposite with Fast Li+ Ion Conductivity: A Solvent-Free Polymer Electrolyte Reinforced with Decorated Fe3O4 Nanoparticles

“…The solution-casting method is typically applied to synthesize thin polymer membranes as solvent-free polymer electrolytes. There is a large volume of published studies describing the effect of various polymer host matrixes, including polyethylene oxide (PEO), poly methyl methacrylate, polyvinyl chloride, and many more, on the electrochemical behavior of the SPEs . Among various investigated polymers, PEO has been identified to meet all the requirements as the polymer host matrix for LIBs.…”

Lithium metal batteries with in situ copolymerized fluorinated polyether electrolytes

“…5d), the peaks of common carbon bonds, including C-C/C-H (at z285 eV), C-O (at z286.5 eV), C]O (at z289 eV), and C-F/CO 3 2− (at z291 eV), were present. 22,62,63 Notably, in the C 1s spectrum of the 0.03TB-TFPO/9DOL sample (Fig. 5e), a new signal peak was observed at the bond energy of 287 eV.…”

Molecular Engineering toward Robust Solid Electrolyte Interphase for Lithium Metal Batteries

“…[108,109] The elaborately tailored polymer electrolyte with Li metal can produce a passivation layer that further evolves into a tunable artificial SEI. [110,111] A polymer electrolyte, polyvinylidene fluoride-based composite polymer electrolytes ((PVDF-CPEs), was polymerized at the interface by a UV curing process, and a high concentrated electrolytes (HCEs) layer was generated. [59] Figure 5h depicts the formation process of the UV-polymerized HCE layer.…”