Application of a Modified Porphyrin in a Polymer Electrolyte with Superior Properties for All-Solid-State Lithium Batteries

Abstract

Porphyrins and their derivatives are a unique class of multifunctional and modifiable π-conjugated heterocyclic organic molecules, which have been widely applied in the fields of optoelectronic devices and catalysis. However, the application of porphyrins in polymer electrolytes for all-solid-state lithium-ion batteries (ASSLIBs) has rarely been reported. Herein, porphyrin molecules modified by polyether chains are used for composite solid-state polymer electrolytes (CSPEs) for the first time. The introduction of a modified porphyrin in an electrolyte can not only promote the electrochemical properties by constructing ordered ion channels via the intermolecular interaction between π-conjugated heterocyclic porphyrins, but also significantly improve the mechanical strength and interface contact between the electrolyte membrane and the lithium metal anode. Consequently, the all-solid-state batteries assembled by the modified porphyrin composite polymer electrolyte, LiFePO 4 cathodes, and Li anodes deliver a higher discharge capacity of 158.2 mA h g −1 at 60 °C, 0.2 C, which remains at 153.6 mA h g −1 after 120 cycles with an average coulombic efficiency of ∼99.60%. Furthermore, the flexible porphyrin-based composite polymer electrolyte can also enable a Li || LiCoO 2 battery to exhibit a maximum discharge capacity of 108.6 mA h g −1 at 60 °C, 0.1 C with an active material loading of 2−3 mg cm −2 , which is unable to realize for the corresponding batteries with a pure PEO-based polymer electrolyte. This work not only broadens the application scope of porphyrins, but also proposes a novel method to fabricate CSPEs with improved electrochemical and mechanical properties, which may shed new light on the development of CSPEs for next-generation high-energy-density lithium-ion batteries.

A Highly Salt-Soluble Ketone-Based All-Solid-State Polymer Electrolyte with Superior Performances for Lithium-Ion Batteries

“…The inset represents the impedance spectra before and after polarization at 60 °C. (d) Comparison of t Li+ of the PAD electrolyte with the previous reported other electrolytes. ,,− …”

Advances and prospects of porphyrin derivatives in the energy field

“…The introduction of modified porphyrins into polymer electrolytes of all-solid-state lithium-ion batteries (ASSLIB) has improved the electrochemical properties of the electrolytes, and this work has broadened the application range of porphyrins. 106…”

Recent Advances in Porous Polymers for Solid-State Rechargeable Lithium Batteries

“…To this end, researchers have made many attempts to improve the performance of all-solid-state lithium batteries since the initial exploration of electrolyte materials. Some combine the advantages of organic materials [12][13][14] such as polymer electrolytes and inorganic materials [15][16][17] such as ceramic electrolytes to prepare hybrid electrolytes to improve ionic conductivity [18][19][20][21]; some add functional additives to electrodes and electrolytes to increase interfacial contact [22,23]; Some insert new coatings between electrolytes to reduce interfacial resistance [24][25][26], etc. Most of these attempts are inseparable from the participation of polymers, which play a significant role in the improvement of battery performance.…”