MXene‐Based Mesoporous Nanosheets Toward Superior Lithium Ion Conductors

Abstract

Although solid polymer electrolytes have some intrinsic advantages in synthesis and film processing compared with inorganic solid electrolytes, low ionic conductivities and mechanical moduli hamper their practical applications in lithium‐based batteries. Here, an efficient strategy is developed to produce a unique solid polymer electrolyte containing MXene‐based mesoporous silica nanosheets with a sandwich structure, which are fabricated via controllable hydrolysis of tetraethyl orthosilicate around the surface of MXene‐Ti3C2 under the direction of cationic surfactants. Such unique nanosheets not only exhibit individual, thin, and insulated features, but also possess abundant functional groups in mesopores and on the surface, which are favorable for the formation of Lewis acid–base interactions with anions in polymer electrolytes such as poly(propylene oxide) elastomer, enabling the fast Li+ transportation at the mesoporous nanosheets/polymer interfaces. As a consequence, a solid polymer electrolyte with high ionic conductivity of 4.6 × 10−4 S cm−1, high Young's modulus of 10.5 MPa, and long‐term electrochemical stability is achieved.

Tortuosity Modulation toward High‐Energy and High‐Power Lithium Metal Batteries

“…The inorganic fillers are introduced into SCEs to enhance their ionic conductivity and mechanical strength, which can be divided into passive and active fillers based on their ion-conductive behavior. [18] Passive fillers generally include Al 2 O 3 , [146] SiO 2 , [147][148] TiO 2 , [149][150] GO sheets, [151][152] vermiculite sheets, [153] and MXene-Ti 3 C 2 layers, [154][155] which would reduce the polymer crystallinity and enhance segmental motions of polymer chains at inorganic/polymer interfaces, thereby facilitating lithium-ion transport. In addition, functional groups (OH, F) on the surface of passive fillers may improve the lithium-ion transference number via Lewis acid-base interaction with ionic species.…”

Macromolecular Design of Lithium Conductive Polymer as Electrolyte for Solid‐State Lithium Batteries

“…Reproduced with permission. [ 169 ] Copyright 2020, John Wiley and Sons. f) Schematic representation of the anion‐immobilized CMOF.…”

“…Moreover, the interactions between inorganic fillers and PEO protect ether groups from oxidation, which renders CPE a wide electrochemical stable window. Yangshu Bin's group [ 169 ] prepared MXene‐Ti 3 C 2 ‐based mesoporous silica nanosheet (MXene‐mSiO 2 ) via hydrolysis of tetraethyl orthosilicate around the MXene under the guiding of cetyltrimethyl ammonium bromide. Furthermore, the rigid Mxene‐mSiO 2 is dispersed in PPO polymer matrix via hydrogen bonding, showing a good mechanical strength and elasticity and a 34 times higher Young's modulus than Si/PPO CPE (specifically 10.5 MPa).…”

The development, application, and performance of black phosphorus in energy storage and conversion

“…1 (a) Comparison of common 2D materials. [5][6][7][8][9][10][11] (b) The pie chart showing different ratios of publications on energy storage and conversion in the year of 2020 based on the data source of Web of Science.…”