Understanding High-Energy-Density Sn4P3 Anodes for Potassium-Ion Batteries

Zhang, Wenchao; Pang, Wei Kong; Sencadas, Vítor; Guo, Zaiping

doi:10.1016/j.joule.2018.04.022

Cited by 481 publications

(345 citation statements)

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“…We find that the electrodes using KFSI-EP and KFSI-EPF electrolytes exhibit lower impedance than those using KPF-EP and KPF-EPF electrolytes,a nd this is attributed to the higher ionic mobility of KFSI. [39] Owing to the low impedance,t he battery can exhibit ultrafast potassium-ion storage.F igure 3d shows the FTIR spectra of NCS@RGO-2 using different electrolytes after 50 cycles.A ll electrodes exhibit S À F, C À F, C = C, OCH 3 ,C O 3 ,a nd K À Fs tretching vibrations.R CH 3 is observed for the electrodes using KFSI-EP and KFSI-EPF electrolytes,w hich stems from the KFSI. [39] Owing to the low impedance,t he battery can exhibit ultrafast potassium-ion storage.F igure 3d shows the FTIR spectra of NCS@RGO-2 using different electrolytes after 50 cycles.A ll electrodes exhibit S À F, C À F, C = C, OCH 3 ,C O 3 ,a nd K À Fs tretching vibrations.R CH 3 is observed for the electrodes using KFSI-EP and KFSI-EPF electrolytes,w hich stems from the KFSI.…”

Section: Angewandte Chemiementioning

confidence: 99%

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

et al. 2019

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Metal-organic framework-derived NiCo 2.5 S 4 microrods wrapped in reduced graphene oxide (NCS@RGO) were synthesized for potassium-ion storage.Upon coordination with organic potassium salts,N CS@RGO exhibits an ultrahigh initial reversible specific capacity (602 mAh g À1 at 50 mA g À1 ) and ultralong cycle life (a reversible specific capacity of 495 mAh g À1 at 200 mA g À1 after 1900 cycles over 314 days). Furthermore,t he battery demonstrates ah igh initial Coulombic efficiency of 78 %, outperforming most sulfides reported previously.A dvanced ex situ characterization techniques,i ncluding atomic force microscopy, were used for evaluation and the results indicate that the organic potassium salt-containing electrolyte helps to form thin and robust solid electrolyte interphase layers,w hichr educe the formation of byproducts during the potassiation-depotassiation process and enhance the mechanical stability of electrodes.T he excellent conductivity of the RGO in the composites,a nd the robust interface between the electrodes and electrolytes,i mbue the electrode with useful properties;i ncluding,u ltrafast potassium-ion storage with areversible specific capacity of 402 mAh g À1 even at 2Ag À1 .

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Section: Angewandte Chemiementioning

confidence: 99%

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

et al. 2019

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“…[6] As ah opefula lternative candidate to LIBs, potassium-ion batteries (KIBs) have attracted considerable attention because the potassium source is more abundant than lithium in the Earth's crust. [9] To date, many types of anode materialsh ave been reported for KIBs. [9] To date, many types of anode materialsh ave been reported for KIBs.…”

Section: Introductionmentioning

confidence: 99%

Direct Growth of MoO₂/Reduced Graphene Oxide Hollow Sphere Composites as Advanced Anode Materials for Potassium‐Ion Batteries

et al. 2019

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Hollow MoO2/reduced graphene oxide (MoO2/rGO) sub‐microsphere composites have been fabricated through a simple hydrothermal approach followed by a heat treatment process. When employed as an anode material for potassium‐ion batteries, the as‐synthesized MoO2/rGO composite can deliver an initial charge specific capacity of 367.2 mAh g−1 at 50 mA g−1, and its reversible capacity is 218.9 mAh g−1 after 200 cycles. Even when cycled at 500 mA g−1, a high charge specific capacity of 104.2 mAh g−1 is achieved after 500 cycles. The excellent cycling capability and rate performance may be ascribed to the synergistic effects of the reduced graphene oxide and the hollow MoO2 spheres, which can increase the electrical conductivity of the composite, as well as resisting the strain arising from the repeated discharge–charge processes. These results indicate that the MoO2/rGO hollow sphere composites are promising negative electrode materials for potassium‐ion batteries.

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“…In comparison, there are only one couple of redox peaks with HCE and LHCE (Figure 3a) at a low voltage range, corresponding to the formation of b-GICs. 2019, 9,1902618 (Figure 3b). Energy Mater.…”

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confidence: 99%

Localized High‐Concentration Electrolytes Boost Potassium Storage in High‐Loading Graphite

Qin

Xiao

Zheng

et al. 2019

Advanced Energy Materials

165

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graphite has a theoretical capacity of 279 mAh g −1 . [3,17] In 2015, Ji and Hu have separately demonstrated the electrochemical intercalation of K ions into graphite in potassium hexafluorophosphate (KPF 6 )/ ethylene carbonate (EC)-diethyl carbonate (DEC) electrolytes. [4,18] However, their works did not achieve a highly reversible K + insertion/extraction process in KPF 6 /EC-DEC electrolyte because the formed solid electrolyte interphase (SEI) becomes fragile and unstable due to the large volume variation (≈60%) during K + insertion/extraction. [19,20] Compared to the conventional lowconcentration electrolyte (LCE), adopting a high-concentration electrolyte (HCE, e.g., >3 m) is a promising strategy to solve the above problem because it possesses some unusual physicochemical and electrochemical properties due to the unique solvation structure of ions, which make it different from an LCE. [21][22][23][24] In 2007, Jeong adopted the concentrated lithium bisperfluoroethylsulfonyl imide LiN(SO 2 C 2 F 5 ) 2 / propylene carbonate (PC) to realize a reversible graphite anode for lithium-ion batteries. [24] Recently, Komaba and Lu have reported the highly reversible graphite anode for PIBs at concentrated potassium bis(fluorosulfonyl)imide (KFSI)/ dimethoxyethane (DME) and KFSI/ethyl methyl carbonate electrolytes, respectively. [25,26] Despite these progresses, the issues of high viscosity, low ionic conductivity, and the increased cost of the HCE still hinder its practical applications. To overcome these disadvantages in using HCE, several groups have added a low-polarity cosolvent to dilute an HCE by forming a localized high-concentration electrolyte (LHCE). It is believed that the introduced cosolvent does not participate in the solvation process. Zhang's group used the bis(2,2,2,-tri-fluoroethyl) ether to dilute the concentrated lithium bis(fluorosulfonyl) imide (LiFSI)/dimethyl carbonate and improve the coulombic efficiency (CE) of lithium metal anodes without dendrite formation. [27] They also diluted concentrated LiFSI in sulfone with a fluorinated ether for high-voltage (4.9 V) lithium metal batteries. [28] Wang's group used the same cosolvent in the concentrated LiFSI/DME to increase both coulombic efficiencies of S cathode and Li anode for Li-S batteries. [29] However, none of the LHCE reported to date has been applied in PIBs, its stability and compatibility with PIBs remain in question.Herein, our work reports for the first time that a highly reversible K + insertion/extraction into graphite interlayer can Reversible intercalation of potassium-ion (K + ) into graphite makes it a promising anode material for rechargeable potassium-ion batteries (PIBs). However, the current graphite anodes in PIBs often suffer from poor cyclic stability with low coulombic efficiency. A stable solid electrolyte interphase (SEI) is necessary for stabilizing the large interlayer expansion during K + insertion. Herein, a localized high-concentration electrolyte (LHCE) is designed by adding a highly fluorinated ether into the con...

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Understanding High-Energy-Density Sn4P3 Anodes for Potassium-Ion Batteries

Cited by 481 publications

References 29 publications

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

Direct Growth of MoO₂/Reduced Graphene Oxide Hollow Sphere Composites as Advanced Anode Materials for Potassium‐Ion Batteries

Localized High‐Concentration Electrolytes Boost Potassium Storage in High‐Loading Graphite

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Understanding High-Energy-Density Sn4P3 Anodes for Potassium-Ion Batteries

Cited by 481 publications

References 29 publications

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

Direct Growth of MoO2/Reduced Graphene Oxide Hollow Sphere Composites as Advanced Anode Materials for Potassium‐Ion Batteries

Localized High‐Concentration Electrolytes Boost Potassium Storage in High‐Loading Graphite

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Direct Growth of MoO₂/Reduced Graphene Oxide Hollow Sphere Composites as Advanced Anode Materials for Potassium‐Ion Batteries