K2Ti6O13 nanorods for potassium-ion battery anodes

Metal chalcogenides for potassium storage

“…Inspired by the existing pioneering work involving graphite, tremendous efforts have been devoted to this area of research. To date, several categories of materials are verified to be effective for potassium storage in terms of anodes, including carbon nanophases (eg, hard carbon, graphite, and heteroatom‐doped carbon), alloy‐type (semi‐)metals (eg, Sn, Bi, Sb, and P), metal oxides (eg, Nb 2 O 5 , SnO 2 , Fe x O, and Sb 2 MoO 6 )/sulfides (eg, MoS 2 , VS 2 , SnS 2 , and Sb 2 S 3 ) and phosphides (eg, FeP, CoP, Sn 4 P 3 , and GeP 5 ), sylvite compounds (eg, KVPO 4 F, K 2 V 3 O 8 , KTi 2 (PO 4 ) 3 , and K x Mn y O z ), metal‐organic composites (eg, Co 3 [Co(CN) 6 ] 2 and K 1.81 Ni[Fe(CN) 6 ] 0.97 ·0.086H 2 O), and pure organic polymers (eg, boronic ester, fluorinated covalent triazine, perylene‐tetracarboxylate, perylenetetracarboxylic diimide, azobenzene‐4,4′‐dicarboxylic acid potassium, 2,2′‐azobis[2‐methylpropionitrile], and poly[pyrene‐ co ‐benzothiadiazole]). However, most carbon materials barely deliver reversible capacities exceeding 300 mAh g −1 despite their excellent electrochemical cyclability.…”

State-of-the-art anodes of potassium-ion batteries: synthesis, chemistry, and applications

“…13i ). 118 Moreover, self-assembled Ti 3 C 2 MXene and N-rich porous carbon hybrids (PDDA-NPCN/Ti 3 C 2 ) were reported and further applied as active materials for potassium storage ( Fig. 13j ).…”

Controllable synthesis of Na, K-based titanium oxide nanoribbons as functional electrodes for supercapacitors and separation of aqueous ions

“…17,18 Many studies have confirmed that titanium oxides with a layer structure and connected framework can be beneficial for the fast insertion of aqueous ions with favorable transport and characteristic pseudocapacitance. 19,20 Such materials have also exhibited the structural stability of compounds by the existence of alkali ions in the crystal system, with Na 2 Ti 3 O 7 , 20 Na 2 Ti 6 O 13 , 21,22 and K 2 Ti 6 O 13 23,24 regarded as potential anode materials with excellent rate capability for battery applications. 19 Chen and colleagues synthesized layered Na 2 Ti 3 O 7 nanoribbons as a high-performance anode for rechargeable Mg–ion batteries with good rate capability.…”

“…19,20 Such materials have also exhibited the structural stability of compounds by the existence of alkali ions in the crystal system, with Na 2 Ti 3 O 7 , 20 Na 2 Ti 6 O 13 , 21,22 and K 2 Ti 6 O 13 23,24 regarded as potential anode materials with excellent rate capability for battery applications. 19 Chen and colleagues synthesized layered Na 2 Ti 3 O 7 nanoribbons as a high-performance anode for rechargeable Mg–ion batteries with good rate capability. 17 Additionally, Wang's group prepared K 2 Ti 6 O 13 nanobelts on a graphene platform for a K–ion capacitor with high energy/power densities and a long cycle life.…”