Porous polyimide framework based on perylene and triazine for reversible potassium-ion storage

Abstract

Potassium-ion batteries have attracted considerable attentions as an emerging energy storage solution due to the abundance of potassium resources. The current development of potassium-ion batteries is, however, largely impeded by...

2D Molecular Sheets of Hydrogen‐Bonded Organic Frameworks for Ultrastable Sodium‐Ion Storage

“…[17][18][19] A number of conjugated polymers (such as covalent organic frameworks or COFs) with different building units and topologies have been accordingly explored. [20][21][22][23][24][25] They often have low structural crystallinity and unsatisfactory cycling stability limited to a few hundreds of cycles.In addition to covalent bonding, some organic building blocks (such as those containing carboxylic acid or amine functionalities) may also self-assemble through weak hydrogen bonding to form ordered two-dimensional (2D) or three-dimensional (3D) frameworks known as hydrogen bonded organic frameworks (HOFs). [26][27][28][29] They generally have great structural crystallinity, large surface areas and porosity, and have been widely investigated for gas separation, sensing, proton conduction and so on.…”

“…[17][18][19] A number of conjugated polymers (such as covalent organic frameworks or COFs) with different building units and topologies have been accordingly explored. [20][21][22][23][24][25] They often have low structural crystallinity and unsatisfactory cycling stability limited to a few hundreds of cycles.…”

Room‐temperature metal–sulfur batteries: What can we learn from lithium–sulfur?

“…[6][7][8][9] Hence, the search of next-generation batteries with higher energy density and abundant resources than the current LIBs is a central research activity in the continuing development of energy storage devices. [10][11][12][13] Sulfur, as a byproduct in the petroleum industry, is regarded as one of the most promising electrode materials for energy storage because of its high theoretical capacity and abundant resource. [14][15][16][17] The theoretical capacity of sulfur (~1672 mAh g À1 ) is nearly an order of magnitude higher than conventional insertion-type cathode materials.…”

“…Additionally, the growing cost of LIB raw materials has led to the concern of its long‐term sustainability as a result of limited supply of raw materials 6–9 . Hence, the search of next‐generation batteries with higher energy density and abundant resources than the current LIBs is a central research activity in the continuing development of energy storage devices 10–13 …”

Poly(benzobisthiazole-dione) Frameworks for Highly Reversible Sodium- and Potassium-Ion Storage

“…Organic electrode materials (OEMs) have great functional flexibility and tunability and are potentially capable of accommodating large-sized ions. − Their electrochemical reactions with Na + and K + proceed through the redox process of their electroactive functionalities instead of the cation intercalation/deintercalation and are thereby subjected to little structural changes and a minimized ion-size effect. − Moreover, metal-free OEMs are generally more environmentally benign and have lower costs than their inorganic counterparts. − As an important class of OEMs, carbonyl compounds (including quinones, anhydrides, and imides) have attracted considerable attention because of their high electrochemical reversibility and large theoretical capacities. , Their small molecules, unfortunately, often have significant solubility in common organic solvents, giving rise to very poor cycle stability and sometimes a shuttle effect.…”