A Metal–Organic Framework‐5‐Incorporated All‐Solid‐State Composite Polymer Electrolyte Membrane with Enhanced Performances for High‐Safety Lithium‐Ion Batteries

Abstract

Solid polymer electrolytes (SPEs) have been one of the most promising candidates to replace nonaqueous liquid electrolyte for achieving high‐safety lithium‐ion batteries (LIBs). However, the extremely low ionic transport capacities of SPEs have seriously hindered their applications in LIBs. Herein, a metal–organic framework (MOF) material MOF‐5 is applied to polymer electrolyte for enhancing electrochemical performances of SPEs. Specifically, a polymer matrix is first obtained via a strategy of random copolymerization of trifluoroethyl methacrylate (TFEMA) and poly(ethylene glycol) methacrylate (PEGMA). Then, a free‐standing flexible composite SPE (CSPE) membrane composed of P(TFEMA‐ran‐PEGMA) polymer, lithium salt, and MOF‐5 (nanofillers) is prepared by the solution casting technique. The results indicate that the room temperature ionic conductivity of the CSPE is 1.5 times higher than that of neat SPEs and lithium‐ion transference number of CSPE remarkably enhances from 0.25 to 0.51. In addition, the as‐prepared CSPE has a very wide electrochemical window of 5.38 V. Moreover, the assembled solid cell LiFePO4/CSPE/Li presents an outstanding specific discharge capacity retention of 92.2% after 25 cycles. Thus, the superior comprehensive properties of the MOF‐incorporated composite polymer electrolyte exhibit a promising potential application in solid electrolyte for high‐safety solid LIBs.

Metal organic framework optimized hybrid solid polymer electrolytes with a high lithium-ion transference number and excellent electrochemical stability

“…On the other hand, it can also improve mechanical properties and re resistance, so as to increase the safety factor. 34,35 As expected, the prepared electrolyte exhibited excellent properties.…”

Tunable Interaction between Metal‐Organic Frameworks and Electroactive Components in Lithium–Sulfur Batteries: Status and Perspectives

“…With PANI@C/S cathode, the discharge capacities of 1520 mAh g −1 in the first cycle at 0.2 C and 325 mAh g −1 in the 1000th cycle at 4 C are obtained at 80 °C. [ 138 ] Beyond MIL‐53(Al), MOF‐5, [ 139 ] UIO‐66‐NH 2 , [ 140 ] and Ni‐MOFs nanosheets [ 141 ] have been acted as fillers, and similar tendencies toward higher ionic conductivity were observed.…”

Metal–organic frameworks and zeolite materials as active fillers for lithium-ion battery solid polymer electrolytes

“…144 This MOF is also able to significantly increase the lithium transference number and ionic conductivity of a TFEMA/PEGMA blend, due to the increase in the amorphous phase content and the microphase separation morphology caused by the addition of the MOF. 138 A comparison between magnesium (Mg)-TPA and Mg-TMA MOFs fillers in a PEO/LiTFSI matrix was performed. The addition of the MOFs promoted a reduction of the degree of crystallinity, further improving the conduction mechanism and increasing the ionic conductivity (Fig.…”