A novel low-cost and environment-friendly cathode with large channels and high structure stability for potassium-ion storage

Wang, Weike; Ji, Bifa; Yao, Wenjiao; Zheng, Yongping; Zhou, Xiaolong; Kidkhunthod, Pinit; He, Hong; Tang, Yongbing

doi:10.1007/s40843-020-1512-0

Cited by 21 publications

(6 citation statements)

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“…In our calculations, we have applied a U value of 4.0 eV to address the interactions of Fe d-electrons and improve the accuracy of the results. This value was chosen based on previous research on oxalate-based materials with Fe as a transition metal. ,,, A kinetic energy cutoff of 520 eV was employed. Geometry optimizations of the unit cell were made by relaxing the atomic coordinates with forces less than 0.01 eV Å –1 and energy change smaller than 10 –5 eV.…”

Section: Methodsmentioning

confidence: 99%

K₂Fe(C₂O₄)₂: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

et al. 2023

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The development of multielectron redox-active cathode materials is a top priority for achieving high energy density with long cycle life in the next-generation secondary battery applications. Triggering anion redox activity is regarded as a promising strategy to enhance the energy density of polyanionic cathodes for Li/Na-ion batteries. Herein, K2Fe(C2O4)2 is shown to be a promising new cathode material that combines metal redox activity with oxalate anion (C2O4 2–) redox. This compound reveals specific discharge capacities of 116 and 60 mAh g–1 for sodium-ion batterie (NIB) and lithium-ion batterie (LIB) cathode applications, respectively, at a rate of 10 mA g–1, with excellent cycling stability. The experimental results are complemented by density functional theory (DFT) calculations of the average atomic charges.

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Section: Methodsmentioning

confidence: 99%

K₂Fe(C₂O₄)₂: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

et al. 2023

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“…Other full batteries based on polyanions cathodes include KVPO 4 F||KVPO 4 F symmetric battery, [ 104 ] K 3 V 2 (PO 4 ) 3 ||K 3 V 2 (PO 4 ) 3 symmetric battery, [ 99 ] KLi 3 Fe(C 2 O 4 ) 3 @C||soft carbon, [ 408 ] KFeC 2 O 4 F||soft carbon, [ 160 ] and K 4 Fe 3 (C 2 O 4 ) 3 (SO 4 ) 2 ||soft carbon. [ 409 ]…”

Section: Potassium‐based Full Batteriesmentioning

confidence: 99%

Prospects of Electrode Materials and Electrolytes for Practical Potassium‐Based Batteries

et al. 2021

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smtd.202101131. Potassium-ion batteries (PIBs) have attracted tremendous attention becauseof their high energy density and low-cost. As such, much effort has focused on developing electrode materials and electrolytes for PIBs at the material levels. This review begins with an overview of the high-performance electrode materials and electrolytes, and then evaluates their prospects and challenges for practical PIBs to penetrate the market. The current status of PIBs for safe operation, energy density, power density, cyclability, and sustainability is discussed and future studies for electrode materials, electrolytes, and electrode-electrolyte interfaces are identified. It is anticipated that this review will motivate research and development to fill existing gaps for practical potassium-based full batteries so that they may be commercialized in the near future.

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“…The reserve of potassium in the earth crust is more than a thousand times that of lithium, and the volume of solvated potassium ions is relatively small [7]. Therefore, potassium-ion batteries (PIBs) are considered to be a promising large-scale energy storage system [8,9]. In recent years, researchers have carried out a series of studies on potential PIB anode materials such as carbon materials [10], transition metal compounds [11], organic compounds [12], and alloy materials [13].…”

Section: Introductionmentioning

confidence: 99%

Anchoring ultrafine CoP and CoSb nanoparticles into rich N-doped carbon nanofibers for efficient potassium storage

et al. 2021

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Transition-metal compounds have received extensive attention from researchers due to their high reversible capacity and suitable voltage platform as potassium-ion battery anodes. However, these materials commonly feature a poor conductivity and a large volume expansion, thus leading to underdeveloped rate capability and cyclic stability. Herein, we successfully encapsulated ultrafine CoP and CoSb nanoparticles into rich N-doped carbon nanofibers (NCFs) via electrospinning, carbonization, and phosphorization (antimonization). The N-doped carbon fiber prevents the aggregation of nanoparticles, buffers the volume expansion of CoP and CoSb during charging and discharging, and improves the conductivity of the composite material. As a result, the CoP/NCF anode exhibits excellent potassium-ion storage performance, including an outstanding reversible capacity of 335 mA h g −1 , a decent capacity retention of 79.3% after 1000 cycles at 1 A g −1 and a superior rate capability of 148 mA h g −1 at 5 A g −1 , superior to most of the reported transition-metalbased potassium-ion battery anode materials.

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A novel low-cost and environment-friendly cathode with large channels and high structure stability for potassium-ion storage

Cited by 21 publications

References 50 publications

K₂Fe(C₂O₄)₂: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

K₂Fe(C₂O₄)₂: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

Prospects of Electrode Materials and Electrolytes for Practical Potassium‐Based Batteries

Anchoring ultrafine CoP and CoSb nanoparticles into rich N-doped carbon nanofibers for efficient potassium storage

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A novel low-cost and environment-friendly cathode with large channels and high structure stability for potassium-ion storage

Cited by 21 publications

References 50 publications

K2Fe(C2O4)2: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

K2Fe(C2O4)2: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

Prospects of Electrode Materials and Electrolytes for Practical Potassium‐Based Batteries

Anchoring ultrafine CoP and CoSb nanoparticles into rich N-doped carbon nanofibers for efficient potassium storage

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K₂Fe(C₂O₄)₂: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox

K₂Fe(C₂O₄)₂: An Oxalate Cathode for Li/Na-Ion Batteries Exhibiting a Combination of Multielectron Cation and Anion Redox