Realizing Superior Prussian Blue Positive Electrode for Potassium Storage via Ultrathin Nanosheet Assembly

Abstract

Prussian blue analogues have attracted growing attention as the positive electrode materials in rechargeable potassium-ion batteries (KIBs) due to the intrinsic open frameworks and high theoretical capacities. However, the bulk synthesized Prussian blue which is accompanied by aggregation inevitably results in the limited K+ ion mobility and suppressed potassium storage performance. In this work, ultrathin nanosheet-assembled hierarchical Prussian blue materials (K1.4Fe4[Fe­(CN)6]3) are synthesized via a facile dissolution-recrystallization strategy. On the strength of this architecture, the positive electrode displays both high rate (71 and 24.9 mAh g–1 at 50 and 600 mA g–1) and long life-span properties (75.2% of the primal capacity retained after 100 cycles) for potassium storage. The enhanced diffusion kinetics and structural stability are further demonstrated through the galvanostatic intermittent titration technique analysis and ex-situ X-ray diffraction. Our work provides a new nanostructuring strategy for improving the potassium storage in intercalation electrodes.

Boosting Superior Lithium Storage Performance of Alloy‐Based Anode Materials via Ultraconformal Sb Coating–Derived Favorable Solid‐Electrolyte Interphase

“…[10][11][12][13][14][15][16][17][18][19][20][21] For example, the capacity of Si nanowires after 10 cycles is ≈3500 mAh g −1 , which is four times that of Si micrometer particles (≈800 mAh g −1 ). [10][11][12][13][14][15][16][17][18][19][20][21] For example, the capacity of Si nanowires after 10 cycles is ≈3500 mAh g −1 , which is four times that of Si micrometer particles (≈800 mAh g −1 ).…”

The Rise of Prussian Blue Analogs: Challenges and Opportunities for High‐Performance Cathode Materials in Potassium‐Ion Batteries

“…Reproduced with permission. [ 87 ] Copyright 2019, American Chemical Society. h) TEM and i) HRTEM images of MoS 2 nanosheets decorated by PBA nanoparticles.…”

“…[ 48,49 ] Manipulating cathode materials with exquisite morphology provides abundant active sites and fast diffusion channels for K + transport. Accordingly, Qin et al [ 87 ] prepared a self‐assembled hierarchical cathode material (K 1.4 Fe 4 [Fe(CN) 6 ] 3 ) through a dissolution‐recrystallization method. The nanosheet‐assembled microstructure presents a unique flower‐like morphology with a diameter from 400 to 600 nm (Figure 6d–f).…”

High-performance solid-state Zn batteries based on a free-standing organic cathode and metal Zn anode with an ordered nano-architecture

“…4,6 Compared with prevalent lithium-ion batteries based on ammable organic electrolytes, aqueous batteries are more suitable candidates for exible electronics due to their low-cost, good safety, environment friendliness, and simple fabrication process without needing a glovebox. [7][8][9][10] Among various aqueous batteries, zinc-ion batteries are more attractive than alkalineion batteries (Li + , Na + , K + and Mg 2+ ) owing to the excellent properties of zinc metals, which include a relatively low redox potential versus the standard hydrogen electrode (À0.76 V), high theoretical capacity (819 mA h g À1 ), good electrochemical stability against water and oxygen which provides a high operating voltage window ($2 V) and large abundance in the earth's crust. [11][12][13] However, bulk zinc foils are not ideal electrodes for exible electronics because of their rigid characteristics and high density.…”