Molecular engineering regulation redox‐dual‐active‐center covalent organic frameworks‐based anode for high‐performance Li storage

Abstract

Covalent organic frameworks (COFs) show considerable attention and potential value in energy storage and conversion. However, design and preparation novel dual-active-center modified COFs for high-performance Li storage and accelerating Li diffusion are still challengeable. In this work, we synthesize dual-active-group of C N and C O decorated COF (denoted as Tp-Ta-COF) as the anode material for lithium-ion batteries (LIBs). Benefiting from the dual-active-site, the Li + diffusion kinetics on the Tp-Ta-COF are improved and Tp-Ta-COF electrode delivers high reversible capacity of 413 mAh g À1 under current density with 200 mA g À1 . Moreover, 18 Li + can be embed in Tp-Ta-COF with C N and C O containers. The mechanism between Li + and active-site is deeply deduced and studied by multiple in situ techniques and density functional theory (DFT) theoretical calculation, suggesting interactions of Li + and active-group are highly reversible procedures. Consequently, we expect this work could create a universal strategy for construction high-performance Li storage COF-based materials.

SnS@C nanoparticles anchored on graphene oxide as high-performance anode materials for lithium-ion batteries

“…However, the mainstream commercial anode electrode materials of graphite suffer from a theoretical specific capacity of 372 mAh g −1 , which limits the further improvement of the energy density of LIBs ( Choi et al, 2012 ; Ding et al, 2022a ). Therefore, developing high-capacity anode electrode materials becomes the essential strategy to achieve high energy density LIBs ( Shen et al, 2018 ; Cui et al, 2020 ; Ding et al, 2022b ; Zhao et al, 2022 ). Up to now, a large number of high-capacity anode electrode materials, including alloy-based anodes, metal oxides, and metal sulfides, are being investigated as promising anode materials for the next-generation of high energy density LIBs owing to their high capacity ( Li et al, 2017 ; Pan et al, 2018 ; Pan et al, 2020 ).…”

Metal‐organic framework derived porous structures towards lithium rechargeable batteries

“…Li metal is attracting attention as a very interesting candidate material for anode because it has a high theoretical capacity up to 3860 mAh g À1 and has the lowest standard reduction potential (3.04 V vs. standard hydrogen electrode [SHE]), 596,597 although commercial applications suffer from the following problems: (1) safety issues (short circuits and thermal runaway) caused by uncontrolled Li dendrite growth during charging; (2) capacity and lifetime reduction issues caused by the accumulation of dead Li in the anode, which increases the internal resistance of the battery; (3) unstable and brittle SEI layer on the Li metal, which consumes much of the electrolyte and fresh Li; and (4) volume changes in the cycling process, which cause the intrinsic SEI layer to fall off the Li metal surface, further impairing the interfacial stability. 98 Numerous approaches have been proposed to resolve these issues [598][599][600][601] : (1) construction of a 3D Li anode structure to reduce volume changes and enable dendrite-free Li deposition [602][603][604][605][606][607][608][609][610] ; (2) application of artificial SEI layers to reduce the consumption of organic electrolytes and fresh Li [611][612][613][614][615][616] ; (3) that cam produce a tough physical layer as a coating to inhibit Li dendrite growth; (4) lithiophilic material to induce Li nucleation 617,618 ; (5) utilization of well-designed solid-state electrolytes (SSEs) with excellent chemical stability, a high Young's modulus and good Li + conductivity [619][620][621] ; (6) the introduction of additives to help minimize side reactions and obtain a stable SEI layer 622,623 ; and (7) modification of the separator to provide a uniform channel for Li + flux and induce uniform Li deposition, as well as preventing Li dendrite growth due to its mechanical strength. [624]…”

“…Metal–organic frameworks (MOFs) are considered as tempting candidates to satisfy the demands of advanced energy storage technologies 5,33,97–109 . MOFs, which have great advantages such as large surface area, large pore volume, and can be design with desired properties by selecting and processing appropriate building blocks during synthesis, are porous material composed of a metal nodes and organic linker 110–117 .…”

“…Metal-organic frameworks (MOFs) are considered as tempting candidates to satisfy the demands of advanced energy storage technologies. 5,33,[97][98][99][100][101][102][103][104][105][106][107][108][109] MOFs, which have great advantages such as large surface area, large pore volume, and can be design with desired properties by selecting and processing appropriate building blocks during synthesis, are porous material composed of a metal nodes and organic linker. [110][111][112][113][114][115][116][117] Because the material properties required for each type of Li battery are different, this synthetic versatility of being able to synthesize variously through the combination of metal nodes and organic linkers constituting the MOF provides a way to overcome material limitations and optimize them for devices.…”

COF‐based single Li+ solid electrolyte accelerates the ion diffusion and restrains dendrite growth in quasi‐solid‐state organic batteries

“…Rechargeable lithium-ion (Li-ion) batteries play an important role in electrochemical energy storage systems and lead to many benefits in the field of portable energy as well as other fields. [1][2][3] Nevertheless, Li-ion liquid electrolytes have several disadvantages such as a limited electrochemical window, tendency to short circuit, combustibility, explosibility, and other safety hazards in applications. 4 Theoretically, solid-state Li-ion batteries (SSLIBs) have higher energy densities and better safety characteristics than solvent-based Li-ion batteries (LIBs).…”