Ultrafast Sodium/Potassium‐Ion Intercalation into Hierarchically Porous Thin Carbon Shells

Abstract

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201805430. Anode MaterialsLithium-ion batteries (LIBs) have been playing a vital role in the development of portable electronics for the last couple of decades, thanks to their high energy storage capabilities and longer cyclic lives. However, the long-term applications of LIBs at larger scale (such as automotive) face severe challenges due

A 3D Trilayered CNT/MoSe2/C Heterostructure with an Expanded MoSe2 Interlayer Spacing for an Efficient Sodium Storage

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attention because of its low cost and abundant supply of sodium. [4][5][6] Further, the large radius of Na + in SIB electrodes produces sluggish electrochemical kinetics, provides higher diffusion barriers, and causes large volume expansion which leads to low rate capability and poor cyclic stability. [4][5][6] Further, the large radius of Na + in SIB electrodes produces sluggish electrochemical kinetics, provides higher diffusion barriers, and causes large volume expansion which leads to low rate capability and poor cyclic stability.

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

“…The MCCF-2 electrode exhibits excellent long-term cycling stability with a reversible capacity of 110.9 mAh g −1 over 2000 cycles, implying a capacity decay of only 0.0206% per cycle, which is better than that of many other reported carbon anode for PIB, as shown in Table 1. [2,4,7,8,24,25,33,34,39,40] The better electrochemical performance of the MCCF-2 electrode should be attributed to its optimal multichannel structure (relatively higher specific surface areas and well mechanical property). In detail, MCCF-2 sample has hierarchical pores, in which, the micro-and mesopores can provide access for electrolyte penetration, facilitating the transportation of K + and buffering the volume change during the charge/discharge process, [32,41] thus improving the cycle stability accordingly; and macropores can increase the specific surface areas of carbon electrode, facilitating the adsorption of K + increasing the pseudocapacitance.…”

“…Interfaces 2020, 7,1901829 Activated carbon (AC-2) 50 260 100.3 mAh g −1 after 100 cycles at 200 mA g −1 [4] Potato biomass porous carbon (PBPC) 100 248 196 mAh g −1 after 400 cycles at 500 mA g −1 [8] N-doped porous carbon (NPC) 50 349.4 121.3 mAh g −1 after 1000 cycle at 500 mA g −1 [24] Three-shelled hollow carbon nanospheres (3S-HCNs) 28 298 212 mAh g −1 after 100 cycles at 560 mA g −1 [25] Nitrogen/oxygen dual-doped hierarchical porous hard carbon (NOHPHC) 50 315 130 mAh g −1 after 1100 cycles at 1050 mA g −1 [34] N-doped carbon nanofibers (NCFs) 0.1C (1C = 279 mAh g −1 ) 240.1 103.4 mAh g −1 after 500 cycles at 2C [7] Few-layer nitrogen-doped graphene (FLNG) 50 390 150 mAh g −1 after 500 cycles at 500 mA g −1 [33] N-doped hierarchical porous carbon (NHPC) 100 263.6 119.9 mAh g −1 after 1000 cycles at 1000 mA g −1 [39] S and N codoped interconnected thin carbon shells (S/N@C) 50 320 65 mAh g −1 after 900 cycles at 2000 mA g −1 [40] www.advmatinterfaces.de Figure 6 schematically illustrates the unique multichannel structure of MCCF-2 anode for potassium-ion battery and the excellent electrochemical performance of MCCF-2 can be explained by the following reasons: i) the amorphous characteristic of MCCF-2 means a plenty of space in MCCF-2 compared with graphite, which is beneficial to buffering the volume expansion; ii) the multichannels in MCCF-2 not only provide much spaces for volume change during the charge/discharge process, but also benefit the infiltration of the electrolyte into the structure; iii) the high conductivity and interconnected structure of MCCF-2 enable the electron and K + to transfer faster; iv) the in situ N-, O-doping in MCCF-2 is beneficial to storage of more potassium ions as many reports declared. Mater.…”

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.…”