Ultra‐High Pyridinic N‐Doped Porous Carbon Monolith Enabling High‐Capacity K‐Ion Battery Anodes for Both Half‐Cell and Full‐Cell Applications

Abstract

An ultrahigh pyridinic N-content-doped porous carbon monolith is reported, and the content of pyridinic N reaches up to 10.1% in overall material (53.4 ± 0.9% out of 18.9 ± 0.4% N content), being higher than most of previously reported N-doping carbonaceous materials, which exhibit greatly improved electrochemical performance for potassium storage, especially in term of the high reversible capacity. Remarkably, the pyridinic N-doped porous carbon monolith (PNCM) electrode exhibits high initial charge capacity of 487 mAh g at a current density of 20 mA g , which is one of the highest reversible capacities among all carbonaceous anodes for K-ion batteries. Moreover, the K-ion full cell is successfully assembled, demonstrating a high practical energy density of 153.5 Wh kg . These results make PNCM promising for practical application in energy storage devices and encourage more investigations on a similar potassium storage system.

Ultrastable Potassium Storage Performance Realized by Highly Effective Solid Electrolyte Interphase Layer

“…The cycle performance is still far from commercial applications, although some carbonaceous materials have been developed for potassium storage. In addition, most attentions on PIBs are devoted to developing new materials, whereas the effects of the electrolyte are neglected. Nonetheless, electrolytes also play important roles in metal‐ion batteries, because they could form a passivation layer (solid‐electrolyte interphase, SEI) which is critical to the battery performance .…”

Constructing Multichannel Carbon Fibers as Freestanding Anodes for Potassium‐Ion Battery with High Capacity and Long Cycle Life

“…On the other hand, the Raman spectra shown in Figure 2d and Figure S2d More information of surface atoms states were investigated by X-ray photoelectron spectroscopy (XPS) and shown in Figure 3. The N and O heteroatoms doping provide more active sites for K + storage, improve the specific capacity, [29,30] the N 1s can be deconvoluted into three peaks, namely pyridinic N (N-6) at 398.4 eV, pyrrolic N (N-5) at 400.85 eV, and graphitic N (N-Q) at 401.6 eV. The N and O heteroatoms doping provide more active sites for K + storage, improve the specific capacity, [29,30] the N 1s can be deconvoluted into three peaks, namely pyridinic N (N-6) at 398.4 eV, pyrrolic N (N-5) at 400.85 eV, and graphitic N (N-Q) at 401.6 eV.…”

“…[28,31,32] Among them, relative ratios of N-6 and N-5 are 40.5% and 39.4%, respectively. [17,29,30] N-Q, located inside the carbon plane, can noticeably enhance the electronic conductivity of carbons. [33] Especially, N-6 can induce the local electron deficiency, which has an extremely high affinity for the electron from the adjacent K atom, facilitating the interaction of active materials and K atom.…”

Nature of Bimetallic Oxide Sb2MoO6/rGO Anode for High‐Performance Potassium‐Ion Batteries

“…[1][2][3][4][5] Because of the natural abundance of potassium, a similar redox potential of potassium to lithium, and the low cost, potassiumion batteries (KIBs) serve as a promising substitution to LIBs, [6][7][8][9][10][11] especially attractive in the largescale energy storage systems which strive intensively to lower the price to be competitive with other energy storage techniques. which are being explored vigorously but yield a relatively low specific capacity, [17][18][19][20][21][22][23][24][25][26][27] metal oxides, such as iron oxides, [28] molybdenum oxides, [29,30] niobium pentoxides, [31] tin oxides, [32] and titanium oxides, [33] are interesting anode candidates considering their high gravimetric and volumetric specific capacity, which are able to provide high performance anodes for KIBs. [12][13][14][15][16] Therefore, searching for the high performance KIBs anode (a critical component of KIBs) to alleviate the dramatic volume change is highly demanded to build high performance KIBs.…”

“…which are being explored vigorously but yield a relatively low specific capacity, [17][18][19][20][21][22][23][24][25][26][27] metal oxides, such as iron oxides, [28] molybdenum oxides, [29,30] niobium pentoxides, [31] tin oxides, [32] and titanium oxides, [33] are interesting anode candidates considering their high gravimetric and volumetric specific capacity, which are able to provide high performance anodes for KIBs. which are being explored vigorously but yield a relatively low specific capacity, [17][18][19][20][21][22][23][24][25][26][27] metal oxides, such as iron oxides, [28] molybdenum oxides, [29,30] niobium pentoxides, [31] tin oxides, [32] and titanium oxides, [33] are interesting anode candidates considering their high gravimetric and volumetric specific capacity, which are able to provide high performance anodes for KIBs.…”