Engineering Fast Ion Conduction and Selective Cation Channels for a High‐Rate and High‐Voltage Hybrid Aqueous Battery

Abstract

The rechargeable aqueous metal-ion battery (RAMB) has attracted considerable attention due to its safety,l ow costs,a nd environmental friendliness.Y et the poor-performance electrode materials lead to al ow feasibility of practical application. Ahybrid aqueous battery (HAB) built from electrode materials with selective cation channels could increase the electrode applicability and thus enlarge the application of RAMB.H erein, we construct ah igh-voltage K-Na HAB based on K 2 FeFe(CN) 6 cathode and carboncoated NaTi 2 (PO 4 ) 3 (NTP/C) anode.Due to the unique cation selectivity of both materials and ultrafast ion conduction of NTP/C,t he hybrid battery delivers ah igh capacity of 160 mAh g À1 at a0 .5 Cr ate.C onsiderable capacity retention of 94.3 %i sa lso obtained after 1000 cycles at even 60 Cr ate. Meanwhile,h igh energy density of 69.6 Wh kg À1 based on the total mass of active electrode materials is obtained, which is comparable and even superior to that of the lead acid, Ni/Cd, and Ni/MH batteries.

Ultrafast Aqueous Potassium‐Ion Batteries Cathode for Stable Intermittent Grid‐Scale Energy Storage

“…The schematic diagram of the full cell and the ion‐transport mechanism between two electrodes are proposed (Figure S16, Supporting Information). For NiFC‐porous cathode and NaTi 2 (PO) 3 /C anode, it is clearly observed that the dominate insertion ions in K + /Na + electrolyte are K + and Na + , respectively, consisting with recently reported K 2 FeFe(CN) 6 //NaTi 2 (PO) 3 hybrid full‐cells . Figure 6 a shows the galvanostatic voltage profiles of the full‐cell and individual anodes/cathodes at a 10 C rate.…”

Salt-concentrated acetate electrolytes for a high voltage aqueous Zn/MnO2 battery

“…However, the charge/discharge mechanism and performance of MnO2 is dependent on the particle size and the difference in crystallographic polymorphs (α, β, γ, δ, λ, and amorphous) [22]. In addition, aqueous rechargeable Zn/MnO2 batteries usually exhibit poor stability and restricted energy density due to water splitting in the aqueous electrolytes providing further challenges [23,24].…”

NASICON-Structured NaTi2(PO4)3 for Sustainable Energy Storage

“…Meanwhile, a high energy density of 69.6 Wh kg −1 calculated on the total mass of active electrode materials could be obtained, which is comparable to or even superior to that of current commercial aqueous batteries (Fig. 11 b) [ 186 ]. Using this strategy for integrating different electrode materials with unique cation selectivity toward metal ions, a high-voltage rechargeable aqueous battery will be realized with a high capacity, remarkable energy density, and considerable capacity retention at a high rate.…”

“…e Rate performance of the HAB. f Long-term cycling stability of the HAB at the rate of 60 C [ 186 ]. Copyright 2018, Wiley-VCH Verlag …”