Porous covalent organic frameworks for high transference number polymer-based electrolytes

Abstract

COFs with boron-containing frameworks were used to adsorb the free anion in polymer electrolytes. The Li+ transference number of the resulting electrolytes is thus dramatically improved. The optimized COFs or MOFs could be used as functional additives for future all-solid-state batteries.

Defective 2D Covalent Organic Frameworks for Postfunctionalization

“…Here, we explored the lithium‐ion conductivities of dCOF‐ImTFSI‐60@Li based electrolyte at 373, 393, and 423 K by EIS measurement, and calculated the conductivity of 2.79 × 10 −3 , 4.92 × 10 −3 , and 7.05 × 10 −3 S cm −1 , respectively (Figure S14a, Supporting Information). Interestingly, the ion conductivity reaches as high as 7.05 × 10 −3 S cm −1 at 423 K, which is the highest value of all polymeric crystalline porous materials based all‐solid‐state electrolytes (Table S8, Supporting Information) . As shown in Figure b, long‐term lithium‐ion conductivity of dCOF‐ImTFSI‐60@Li maintains a stable performance after 24 h operating at 423 K. Furthermore, solid electrolytes were soaked and washed by 1,2‐dimethoxyethane and acetone for several times to remove the Li salt from COFs (final product is named as dCOF‐ImTFSI‐60@Li@423K@washed).…”

Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

“…With their high porosity, tailorable pore surface chemistry, and valuable electric/electrochemical/photoelectric properties in many conjugated cases, emerging porous polymers have found vast applications in molecular separation, energy storage, catalysis, sensor, drug delivery, and so on. [33][34][35][37][38][39][40][41][42][43][44][45][46] At the same time, integrated with heteroatomic carbon frameworks, electric conductive network, chemical stability and versatile porous architectures, carbonaceous derivatives of porous polymers are good complementation of porous polymers in many fields, especially as the active electrode materials in energy storage. [47,48] As mentioned above, porosity and functional chemistry synergize the performances of porous polymeric and carbonaceous materials.…”

“…Recently, the emerging porous polymers, also called porous organic polymers (POPs), such as covalent organic frameworks (COFs), conjugated microporous polymers (CMPs), covalent triazine frameworks (CTFs), porous aromatic frameworks (PAFs), hypercrosslinked polymers (HCPs), and polymers of intrinsic microporosity (PIMs), have further enriched the family of porous polymers. With their high porosity, tailorable pore surface chemistry, and valuable electric/electrochemical/photoelectric properties in many conjugated cases, emerging porous polymers have found vast applications in molecular separation, energy storage, catalysis, sensor, drug delivery, and so on . At the same time, integrated with heteroatomic carbon frameworks, electric conductive network, chemical stability and versatile porous architectures, carbonaceous derivatives of porous polymers are good complementation of porous polymers in many fields, especially as the active electrode materials in energy storage …”

Porous Organic Polymers as Promising Electrode Materials for Energy Storage Devices

“…. [98][99][100] Lee and coworkers synthesized lithium sulfonated COFs (TpPaSO 3 Li, Figure 10e) by incorporating sulfonate anion units, which exhibited an ionic conductivity of 2.7 × 10 −5 S cm −1 with a t Li + of 0.9 at room temperature. [98] Zhang and coworkers synthesized a series of imidazolatecontaining ionic COFs as solid electrolyte materials and achieved outstanding ion conductivity of 7.2 × 10 −3 S cm −1 , low activation energy of 0.10 eV, and high t Li + of 0.81, which can be ascribed to the weak Li ion−imidazolate binding interactions and welldefined porous structures of COFs (Figure 10f).…”

“…For instance, Chen and coworkers designed and synthesized boroncontaining COFs (HCOF1, Figure 10g) and afforded high t Li + of 0.71. [100] Based on the above studies, it should be noted that although POPs have made significant progress in the application of rechargeable batteries, such as the realization of capacity com parable to other materials, their performance needs to be further improved. The electrochemical performances of POPs as elec trodes of rechargeable batteries are summarized in Table 2.…”