Magnetic Field Assisted Construction of Hollow Red P Nanospheres Confined in Hierarchical N‐Doped Carbon Nanosheets/Nanotubes 3D Framework for Efficient Potassium Storage

Abstract

properties between elemental K and Li. [1-3] Moreover, the intrinsic advantage of a relative lower negative redox potential of K + /K (-2.93 V) than Na + /Na (-2.71 V) yet closed to the Li + /Li (-3.04 V) entrusts the higher operating voltage/energy densities of PIBs. [4,5] Unfortunately, compared to the Li + (0.76 Å), the larger ionic radius of K + itself (1.38 Å) makes it difficultly insert into the lattice of active materials due to a sluggish kinetic and substantial volume changes, particularly during the (de) alloying process. [6,7] As a result, it is highly desirable to explore appropriate electrode materials to accommodate the large-size K ions, and achieve large reversible capacities and expedited electrochemical kinetics toward efficient potassium storage. Red P, thanks to its high theoretical capacity of ≈2171.7 mAh g-1 and abundance in the nature, stands out from other anodes as the intriguing low-cost electroactive material for PIBs. [8-11] However, the involved electron insulation property, huge volumetric expansion/compression force, and low utilization efficiency of red

An Open‐Ended Ni3S2–Co9S8 Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

“…In terms of structure optimization, designing complex hollow nanostructure can not only inherit the features of traditional hollow structure associated with reduced ion transport distance and enhanced reaction kinetics, but improve the utilization of active species and structure stability of electrode material. [32][33][34] Moreover, combining sulfides with conductive carbon substrate can further improve the electrical conductivity and alleviate the particles' agglomeration or fragmentation during the conversion reaction process, and thus promoting the performances of PIBs. Combining the advantages of the above strategies, one can expect that the complicated bimetallic sulfide heterostructure could markedly enhance the potassium-storage performances.…”

Prospects of Electrode Materials and Electrolytes for Practical Potassium‐Based Batteries

“…In addition to the above mentioned examples, several other reports of full batteries based on organic cathode materials exist, such as, PTCDA||PNCM, [ 189 ] polyimide@graphite nanosheets||soft carbon, [ 158 ] PTCDA‐0C||K 2 TP, [ 398 ] PTCDA||Bi 1.11 Sb 0.89 S 3 , [ 399 ] PTCDI||graphite, [ 159 ] PTCDA||Bi 0.5 Sb 0.5 @P, [ 238 ] PTCDA||N‐doped carbon microspheres, [ 199 ] PTCDA||N‐doped partially graphitized hard carbon, [ 400 ] PTCDA//Bi 2 MoO 6 , [ 401 ] PTCDA||H‐P@NCNS/NCNT, [ 402 ] PTCDA||PASP@SnS 2 @CN, [ 403 ] PTCDA||Bi 0.51 Sb 0.49 OCl/RGO, [ 404 ] Polyimide@KB||soft carbon, [ 405 ] PTCDA||3D nitrogen‐doped turbostratic carbon, [ 406 ] PTCDA||graphite, [ 358 ] and PI@rGO||FeS 2 @NC. [ 407 ]…”

Perspective on Carbon Anode Materials for K+ Storage: Balancing the Intercalation‐Controlled and Surface‐Driven Behavior

“…The strategies include: 1) enhancing specific surface area by introducing nanopores or designing various nanostructures, [ 41–52 ] 2) producing tremendous intrinsic carbon layer defects, [ 36,53 ] and 3) incorporating doped heteroatom functional groups. [ 39,40,54–97 ] Some representative electrochemical results in terms of capacity, cycle stability, and rate performances are summarized in Figure 3e.…”