Bifunctional MOF Doped PEO Composite Electrolyte for Long-Life Cycle Solid Lithium Ion Battery

Abstract

A highly stable composite electrolyte was developed in this research to address the performance decline over time in a solid lithium ion battery (SLIB). It involved the synthesis of bifunctional MOF material (MOF-2) from two different functionalized UiO-66 materials containing carboxyl groups and amine groups, respectively, and the subsequent blending of PEO (polyethylene oxide) with the MOF-2 to form the novel composite solid electrolyte (PEO-MOF-2). The composite electrolytes showed higher ionic conductivity (5.20 × 10–4 S/cm) than that of pristine PEO. The LiFePO4||Li cells constructed with PEO-MOF-2 exhibited 98.45% capacity retention with 149.92 mA h/g after 100 cycles operation at 1.0 C, which was higher than those cells prepared with pristine PEO electrolyte or with PEO-based electrolytes that were only doped by aminated MOF or carboxylated MOF. Furthermore, our experiments showed that there was about a 40% increase in the potential window (from 3.5 to 5.0 V) and 80% increase in the lithium ion transfer number (from 0.20 to 0.36 at 60 °C) as a result of replacing pristine PEO electrolyte with PEO-MOF-2.

In Situ Topological Interphases Boosting Stable Solid‐State Lithium Metal Batteries

“…This undesirable SEI results in sluggish Li + transport kinetics, increased overpotential, and [26] MIP-SPE, [27] PEO/MnO, [28] PVA/UPy/PEG, [29] IMFPIL-LiTFSI, [30] CHPEs-Li, [31] PEO-LPS, [32] CN-PEO, [33] PEO-MOF-2. [34] eventually causes capacity fading with a lower capacity retention of 80.7% after 300 cycles (Figure 5b and Figure S27a, Supporting Information). Impressively, the long-term cycling performance of LiFePO 4 /CPDOL-SPE/Li battery under higher current density and practical conditions is also much more stable than that of the PDOL-SPE counterpart.…”

“…b) Comparison of the cycle life of symmetric cells with CPDOL-SPE and those of previously reported excellent SPEs at 60 °C. PEO with LAGP,[26] MIP-SPE,[27] PEO/MnO,[28] PVA/UPy/PEG,[29] IMFPIL-LiTFSI,[30] CHPEs-Li,[31] PEO-LPS,[32] CN-PEO,[33] PEO-MOF-2 [34]. c) Fitting results of interface impedances of Li/Li cells assembled with CPDOL-SPE and PDOL-SPE at different cycles.…”

Cathode materials for halide-based aqueous redox flow batteries: recent progress and future perspectives

“…Recently, lead-acid and Li-ion batteries have been considered as the two types of the most common energy storage batteries (ESB), showing lower storage efficiency and environmentally hazardous, high-cost, and risky flammable organic electrolytes, respectively, restricting and making them powerless to applications in practical large-scale energy storage applications (LSESA). 6,7 Among the most effective ESS for stationary applications, a special place is occupied by RFB technology, encompassing easy scalability of power density and energy capacity, low self-discharge, long cycle life, and cost efficiency to LSESA. [8][9][10] Relative to the traditional Li-ion ESB storing energy methods such as "rocking-chair type", RFB stores the electrical energy by virtue of the soluble redox couples, converting excess electrical energy to chemical energy and vice versa.…”

UiO‐66‐NH2@67 Core–Shell Metal–Organic Framework as Fillers in Solid Composite Electrolytes for High‐Performance All‐Solid‐State Lithium Metal Batteries

“…[23,24] In details, neat MOFs can absorb Li-containing compounds and transport Li þ through nanopores, so as to work as the lithium-ion conductors. [25][26][27] Additionally, the migration of Li þ in the polymer matrixes mainly relies on the motion of the polymeric chains and this happens mostly in amorphous phases. [28,29] By adding MOFs into SCEs, the regular arrangement of polymer chains can also be disordered for decreasing the crystallinity of polymer matrixes, which plays an important role for obtaining a high ionic conductivity.…”