Inside Back Cover: Ultrastable Surface‐Dominated Pseudocapacitive Potassium Storage Enabled by Edge‐Enriched N‐Doped Porous Carbon Nanosheets (Angew. Chem. Int. Ed. 44/2020)

Xu, Fei; Zhai, Yixuan; Zhang, En; Liu, Qianhui; Xu, Xiaosa; Qiu, Yuqian; Liu, Xiaoming; Wang, Hongqiang; Kaskel, Stefan

doi:10.1002/anie.202011893

Cited by 24 publications

(26 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 44,45 ] The corresponding XPS spectra of the FeS 2 @NS‐3DHCs and pure FeS 2 are shown in Figure S3 (Supporting Information), explaining the composition of valence bonds similar to FeS 2 @G@NS‐3DHCs. According to the previous reports, [ 38,46 ] S doping can improve the charge transfer and electron diffusion capabilities. N doping will create defects for the carbon matrix and enhance the adsorption of K + , thereby increasing the capacity.…”

Section: Resultsmentioning

confidence: 94%

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS₂: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Chen

Ding

Bai

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Resource‐rich FeS2 is a promising anode for potassium‐ion batteries (PIBs). However, polysulfides emerge due to FeS2 conversion during discharging, which dissolve into the ether‐based electrolyte and cause the continuous capacity degradation in PIBs. To address the polysulfides dissolution in PIBs, a graphene–shell‐encapsulated FeS2 is fabricated and embedded in N/S codoped 3D hollow carbon spheres. As a protective pocket, the graphene–shell can effectively accommodate polysulfides inside the core–shell, inhibiting the polysulfides shuttle effect to enhance cycle stability of electrode. The density functional theory (DFT) calculations demonstrate that graphene–shells have a strong adsorption capacity for polysulfides, and the interfacial interaction between KFeS2 and graphene–shell can boost the K ion mobility. As a result, the composite exhibits superior‐rate properties (524 and 224 mA h g−1 at 0.1 and 8 A g−1, respectively) and long‐term cycle stability. This work demonstrates the promotion and protective effect of the graphene–shell for the FeS2 to storage K from both experimental and computational perspectives. These research outputs can provide guidance for designing other metal‐based sulfide electrodes for PIBs.

show abstract

Section: Resultsmentioning

confidence: 94%

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS₂: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Chen

Ding

Bai

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…[ 47 ] The specific formula is as follows

\begin{matrix} i (V) = k_{1} v + k_{2} v^{1 / 2} \end{matrix}

where v is the scanning rate (mV s −1 ), and then the capacitive contributions ( k 1 v ) and diffusion‐controlled contributions ( k 2 v 1/2 ) can be calculated at different scanning rates (Figure S5, Supporting Information). [ 27,29,47 ] In the same voltage window, higher scanning rates will cause less diffusion proportion of the capacity but not significantly affect the capacitive part. [ 48 ] Figure a shows the capacitive proportions of three samples at different scanning speeds.…”

Section: Resultsmentioning

confidence: 99%

“…[ 26 ] On the one hand, it is well known that adsorption in defect sites and intercalation in graphitic regions are common storage ways of K ions. [ 27,28 ] The adsorption referring to a capacitive process is usually considered fast and easy. [ 29 ] This capacitive process can maintain excellent structure stability and improve rate performance.…”

Section: Introductionmentioning

confidence: 99%

Fast Intercalation in Locally Ordered Carbon Nanocrystallites for Superior Potassium Ions Storage

Han

Chen

Zhang

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Hard carbons (HCs) have great potential as anode material for high‐performance potassium ion batteries (PIBs). However, due to the complexity of HCs, the relationship between their structures and potassium (K) storage behaviors is still not quite clear. Here, three types of HCs with different structures are designed for further understanding the electrochemical storage processes. Among them, the carbon spheres (CS) exhibit impressive rate performance (161.6 mAh g−1 at 2 A g−1) and cycle stability (140.2 mAh g−1 at 2 A g−1 after 500 cycles). The superior performance of CS can be mainly ascribed to the intercalation into its locally‐ordered carbon nanocrystallites, and the charge/discharge processes are further characterized with significant pseudocapacitive dominating. Suitable nanocrystalline size and the ratio of defects with proper morphology are the key factors to improve K storage efficiency. This work will contribute to understanding the role of these factors in the K storage performance of carbon materials.

show abstract

“…Except for graphite, various carbonaceous materials (soft carbon, [ 162,165–173 ] hard carbon, [ 74,174–188 ] heteroatomic doped carbon, [ 189–207 ] graphitic carbon [ 164,208–215 ] ) with either long cycle stability or superior rate performance have been well developed in recent years. Though these carbonaceous materials usually suffer from relatively larger polarization voltage and lower initial coulombic efficiency than graphite anode, their discharge capacity, cycle stability, and rate performance are generally enhanced significantly.…”

Section: Anode Materialsmentioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Inside Back Cover: Ultrastable Surface‐Dominated Pseudocapacitive Potassium Storage Enabled by Edge‐Enriched N‐Doped Porous Carbon Nanosheets (Angew. Chem. Int. Ed. 44/2020)

Cited by 24 publications

References 0 publications

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS₂: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS₂: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Fast Intercalation in Locally Ordered Carbon Nanocrystallites for Superior Potassium Ions Storage

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

Contact Info

Product

Resources

About

Inside Back Cover: Ultrastable Surface‐Dominated Pseudocapacitive Potassium Storage Enabled by Edge‐Enriched N‐Doped Porous Carbon Nanosheets (Angew. Chem. Int. Ed. 44/2020)

Cited by 24 publications

References 0 publications

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS2: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS2: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Fast Intercalation in Locally Ordered Carbon Nanocrystallites for Superior Potassium Ions Storage

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

Contact Info

Product

Resources

About

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS₂: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries

Engineering Pocket‐Like Graphene–Shell Encapsulated FeS₂: Inhibiting Polysulfides Shuttle Effect in Potassium‐Ion Batteries