Ultra-stable K metal anode enabled by oxygen-rich carbon cloth

Xie, Yangyang; Hu, Junxian; Han, Zheng; Fan, Hailin; Xu, Jingyu; Lai, Yanqing; Zhang, Zhian

doi:10.1007/s12274-020-2984-5

Cited by 28 publications

(21 citation statements)

References 37 publications

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“…The volume expansion problem is more prominent for anode materials. Particularly, potassium metal anode that has a higher theoretical specific capacity (687 mAh g –1 ) than other PIB anodes suffers from more serious dendrite growth problems and presents worse plating/stripping performance. ,,,− Additionally, the higher reactivity of K metal anodes may cause more severe side reactions with electrolytes to form an unstable solid electrolyte interphase (SEI) layer on the surface as compared to Li. , …”

Section: Introductionmentioning

confidence: 99%

“…To deal with these issues, many efforts have been made, including surface chemistry modification, geometrical structure engineering, electrolyte optimization, and sustainable SEI layer construction. − 3D current collectors have been extensively studied in Li metal anodes owing to their interconnected conductive network and large amount of interior void space, which can effectively accommodate the volume expansion . Carbon nanotube/fiber films have been used as hosts for K metal anodes and achieved improved electrochemical performance. ,, It is found that the wetting property of the carbon host is a critical property in determining the cycling stability of K anodes.…”

Section: Introductionmentioning

confidence: 99%

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Highly Potassiophilic Carbon Nanofiber Paper Derived from Bacterial Cellulose Enables Ultra-Stable Dendrite-Free Potassium Metal Anodes

Zhou

et al. 2021

ACS Appl. Mater. Interfaces

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Potassium−metal batteries are attractive candidates for low-cost and large-scale energy storage systems due to the abundance of potassium. However, K metal dendrite growth as well as volume expansion of K metal anodes on cycling have significantly hindered its practical applications. Although enhanced performance has been reported using carbon hosts with complicated structure engineering, they are not suitable for mass production. Herein, a highly potassiophilic carbon nanofiber paper with abundant oxygen-containing functional groups on the surface and a 3D interconnected network architecture is fabricated through a facile, scalable, and environmental-friendly biosynthesis method. As a host for K metal anode, uniform K nucleation and stable plating/stripping performance are demonstrated, with a stable cycling of 1400 h and a low overpotential of 45 mV, which are much better than all carbon hosts without complicated structure engineering. Moreover, full cells pairing the carbon nanofiber paper/K composite anodes with K 4 Fe(CN) 6 cathodes exhibit excellent cycle stability and rate capability. The results provide a promising way for realizing dendrite-free K metal anodes and high-performance potassium−ion batteries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Potassiophilic Carbon Nanofiber Paper Derived from Bacterial Cellulose Enables Ultra-Stable Dendrite-Free Potassium Metal Anodes

Zhou

et al. 2021

ACS Appl. Mater. Interfaces

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“…K metal batteries have become a strong contender for large‐scale energy storage due to their advantages in sustainability and cost. [ 2c,d,3b,8d,16 ] Previous achievements in the stabilization of K‐metal anodes have mainly been achieved using 3D porous collectors, [ 16a,17 ] artificial SEI layers, [ 15a,b ] surface modification of potassium or copper plates, [ 18 ] modified test protocols, [ 19 ] and mostly in ether‐based electrolytes. [ 3b,20 ] In contrast, the progress with carbonate‐based electrolytes is not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Critical Roles of Mechanical Properties of Solid Electrolyte Interphase for Potassium Metal Anodes

Gao

Hou

Zhou

et al. 2022

Adv Funct Materials

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The mechanical properties of the solid electrolyte interphase (SEI) have attracted increasing attention, but their importance in guiding electrolyte design remains ambiguous. Here it is revealed that, despite a decrease in ionic conductivity for both electrolyte and SEI, exceptional cycling performance of K-metal batteries is achieved in a low concentration carbonate electrolyte by optimizing the mechanical stability of the SEI. The SEI formed in the studied carbonate electrolytes is predominantly organic. Its inorganic content increases with increasing electrolyte concentration and corresponds to an increase in Young's modulus (E) and ionic conductivity of SEI and a decrease in elastic strain limit (ε Y ). The maximum elastic deformation energy combines effects of E and ε Y , achieving a maximum in 0.5 m electrolyte. Finite element simulations indicate that SEI with low either E or ε Y inevitably triggers dendrite growth. These findings foreshadow an increased focus on the mechanical properties of the SEI, where low concentrations of carbonate electrolytes display merit.

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“…Generally, bioderived carbonaceous materials have complex and disordered microstructures, which cause a big difficulty for tuning the structure and performance. − Inspired by the surface structure of the lotus leaf, herein we propose a novel “plains–hills” model for solving this problem. In such a structure, the protuberances on the carbon sheets are considered as the “hills”, which are mainly built by amorphous carbon with rich oxygen defects to enhance the pseudocapacitance.…”

Section: Introductionmentioning

confidence: 99%

“Plains–Hills”: A New Model to Design Biomass-Derived Carbon Electrode Materials for High-Performance Potassium Ion Hybrid Supercapacitors

Ming

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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Enhancing the pseudocapacitance of carbon electrodes by doping them with heteroatoms becomes one promising way for fabricating high energy density supercapacitors. Nevertheless, rich doping with heteroatoms often arouses an inevitable contradiction between pseudocapacitance and conductivity. In this paper, inspired by the surface structure of the lotus leaf, a novel "plains−hills" model of carbon structure is proposed to solve this problem. For achieving this plains−hills structure, CaCl 2 is employed as both a complexing agent and an oxygen scavenger in Ca 2+ −biogels via host−guest complexation, resulting in an ultrathin carbon unstacked nanosheet ("plains" domain) with numerous protuberances ("hills" domain) by a facile one-step pyrolysis. The obtained plains−hills architecture containing the defectrich hills and the ordered plains achieves a harmonious coexistence of high pseudocapacitance and good conductivity in heteroatom-doped carbon materials. As expected, this kind of plains−hills carbon electrode exhibits a reversible capacity of 147.2 mAh g −1 at 10 A g −1 after 5000 cycles, leading to an obvious energy density enhancement of potassium ion hybrid supercapacitors.

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Ultra-stable K metal anode enabled by oxygen-rich carbon cloth

Cited by 28 publications

References 37 publications

Highly Potassiophilic Carbon Nanofiber Paper Derived from Bacterial Cellulose Enables Ultra-Stable Dendrite-Free Potassium Metal Anodes

Highly Potassiophilic Carbon Nanofiber Paper Derived from Bacterial Cellulose Enables Ultra-Stable Dendrite-Free Potassium Metal Anodes

Critical Roles of Mechanical Properties of Solid Electrolyte Interphase for Potassium Metal Anodes

“Plains–Hills”: A New Model to Design Biomass-Derived Carbon Electrode Materials for High-Performance Potassium Ion Hybrid Supercapacitors

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