Flexible, high-voltage and free-standing composite polymer electrolyte membrane based on triethylene glycol diacetate-2-propenoic acid butyl ester copolymer for lithium-ion batteries

Abstract

a b s t r a c tComposite polymer electrolytes (CPE) based on triethylene glycol diacetate-2-propenoic acid butyl ester (TEGDA-BA) incorporating Al 2 O 3 nanoparticles have been fabricated via in situ polymerization. The CPE have exhibited highly uniform morphology, excellent mechanical property (maximum stress up to $ 1.3 MPa), high ionic conductivity up to 3.92 Â 10 À 3 S cm À 1 at 25°C, coupled with very high electrochemical stability ( 45.0 V vs. Li/Li þ ). The Li | CPE|Li[Li 1/6 Ni 1/4 Mn 7/12 ]O 7/4 F 1/4 cells have demonstrated remarkably stable charge/discharge performance and great capacity retention in the potential range of 2.0-4.8 V. The unexpected growth of interface resistance has been retarded with the presence of Al 2 O 3 , indicating the enhancement of the interface stability. The results suggest that the CPE have demonstrated tremendous application potential in high-voltage lithium ion batteries.

Synergistic Coupling between Li6.75La3Zr1.75Ta0.25O12 and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

“…Nevertheless, the low room-temperature conductivity of the polymer electrolytes restricts their applications. To enhance their conductivity, several strategies such as cross-linking, forming block copolymer, adding plasticizers, and introducing ceramic fillers have been intensively explored. Among these attempts, dispersing ceramic fillers in polymer matrix to synthesize composite polymer electrolytes (CPEs) has attracted great interest because it can effectively enhance not only ionic conductivity but also mechanical properties and thermal stability of polymer electrolytes.…”

Nonflammable quasi-solid-state electrolyte for stable lithium-metal batteries

“…31 Compared to homogenous structure, sandwich-type SCE can suppress dendrite as well as form a good interface contact with the electrodes, via regulating the ratio of PEO and Ta-doping LLZO. 32 Furthermore, gelling SCEs by plasticizers, namely forming quasi-solid composite electrolytes (QCEs), together with in situ polymerization, 33,34 has proved to be a feasible way to improve rate and cycle performance of the batteries.…”

Flexible, high-voltage, ion-conducting composite membranes with 3D aramid nanofiber frameworks for stable all-solid-state lithium metal batteries

“…To explain the higher ionic conductivity (σ) of the ANF/PEO-FF electrolyte (than that of the ANF/PEO-DF electrolyte), the activation energy (E a ) was calculated by the Arrhenius relationship equation: σ = Aexp(-E a /RT), where A, E a , R and T represent the pre-exponential factor, activation energy, gas constant, and absolute temperature, respectively [71,73]. In the low-temperature range of 30-60°C, the ANF/PEO-FF electrolyte showed lower activation energy of 64 kJ mol −1 than the ANF/PEO-DF (72 kJ mol −1 ) and PEO-LiTFSI (77 kJ mol −1 ) electrolytes, indicating the relatively fast ion migration [74] and lowenergy-barrier ion transport pathway in the ANF/PEO-FF electrolyte [66]. According to the ion conductivity equation: σ = ΣC i Q i µ i , the low crystallization of the ANF/PEO-DF electrolyte (Fig.…”