Poly(ionic liquid)@PEGMA Block Polymer Initiated Microphase Separation Architecture in Poly(ethylene oxide)-Based Solid-State Polymer Electrolyte for Flexible and Self-Healing Lithium Batteries

Abstract

PEO-based solid electrolytes are eagerly anticipated for being explored in batteries with remarkable performance. Their narrower electrochemical window and weak mechanical strength, however, limit the potential for wide application in safe and highcapacity electronic devices. Herein, a self-healing solid-state electrolyte (PEO@BPIL) is fabricated by the incorporation of an imidazoliumbased polymerized ionic liquid (poly(ethylene glycol) monomethacrylate (PEGMA)) block polymer into PEO, and the influence of copolymer configuration on electrochemical performances of the system is investigated in-depth. In addition to reducing the crystallinity of PEO, an inimitable orderly and orderless microphase separation structure is introduced in PEO@BPIL, which brings about a "green fast track" for Li-ion migration. This contributes to a lithium-ion transference number of 0.63 that is an unsurpassed level. The electrochemical stability window of the optimized PEO@BPIL can achieve 5.0 V (vs Li + / Li). As a result, the capacity and endurance discharge performances for PEO@BPIL based cells are significantly improved. Moreover, the bountiful charged ions on the scaffold endue the electrolyte with generous interactions, conferring the PEO@BPIL predominant adhesiveness toward lithium metal (the hanging weight = 200 g) and standout self-healing ability (recovering time <30 min, 60 °C). The restriction toward lithium dendrite is thus enhanced. The PEO@BPIL-based laminate polymer battery presents ascendant antifolding deformation ability and still exhibits good electrochemical performances after reiterative damage. In combination with the high flame retardancy of polymerized ionic liquid, this work affords a splendid idea for an emerging power supply battery.

Self-healable, super Li-ion conductive, and flexible quasi-solid electrolyte for long-term safe lithium sulfur batteries

“…3C compares σ , n Li + and τ sh of the healed PAES-g-(PU/2PEG90) and PAES-g-(PUS/2PEG90) membranes with those of other recently reported self-healing electrolytes. 83–96…”

“…3C compares s, n Li + and s sh of the healed PAES-g-(PU/2PEG90) and PAES-g-(PUS/2PEG90) membranes with those of other recently reported self-healing electrolytes. [83][84][85][86][87][88][89][90][91][92][93][94][95][96] Effect of temperature. To investigate the Li + transport mechanism of the prepared membranes, the s of the original and self-healed PSEs was examined at various temperatures, as displayed in Fig.…”

Pendant Length-Dependent Electrochemical Performances for Conjugated Organic Polymers as Solid-State Polymer Electrolytes in Lithium Metal Batteries

“…It is generally recognized that because of deformation and formation of the passivation layer, R b and R f of electrolyte materials tend to increase with the extension of test time. 12 The reduction of R b during the test may be caused by the reduction of the thickness of the electrolyte membrane under the action of the electrode clamp. After 15 days of aging, the R f gradually inclines to be stable.…”

“…The bulk resistance ( R b ) of the electrolyte is shown by the initial abscissa on the curve, and the interface resistance ( R f ) between the electrolyte film and the Li electrode is expressed by the diameter of the semicircle in the figure. It is generally recognized that because of deformation and formation of the passivation layer, R b and R f of electrolyte materials tend to increase with the extension of test time . The reduction of R b during the test may be caused by the reduction of the thickness of the electrolyte membrane under the action of the electrode clamp.…”

“…With the ever-increasing demand for efficient and clean energy, electric energy has become the optimum alternative to traditional fossil energy . Lithium battery, as a clean and portable energy storage device, has been widely used in social production and life. − However, most lithium batteries suffer from serious safety problems such as easy leakage, flammability, and explosion due to the used liquid electrolyte. − With the progress of technology and the application of wearable electronic equipment, the demand for flexible high-energy devices has reached a zenith. − By virtue of their outstanding safety, excellent flexibility, and high energy density, solid-state polymer electrolytes (SPEs) have evoked great interest of researchers. Compared with inorganic solid-state electrolytes with poor interface performance, difficulty to process, and high brittleness, SPEs show better processability for large-scale production.…”