Defect‐Selectivity and “Order‐in‐Disorder” Engineering in Carbon for Durable and Fast Potassium Storage (Adv. Mater. 7/2022)

Chen, Yaxin; Xi, Baojuan; Huang, Menglin; Shi, Lifeng; Huang, Shaozhuan; Guo, Nannan; Li, Da; Ju, Zhicheng

doi:10.1002/adma.202270056

Cited by 33 publications

(45 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, ECM‐900 exhibits the lowest disordered structure due to the generation of some pseudo‐graphite domain units at a higher temperature, which is similar to previous reports. [ 16,28 ] These results signify that pyrolysis temperature has a decisive effect on the formation of disordered configurations in carbon matrix, and therefore exhibiting different electron transfer abilities, as evidenced by Table S1 (Supporting Information). It is worth noting that a large number of disordered regions in ECM‐800 can expose more edge sites to electrolyte, [ 10,23 ] which is expected to boost K + adsorption storage.…”

Section: Resultsmentioning

confidence: 88%

“…It is easy to observe that the degree of disordered structure first increases and then decreases with increasing temperature, that is, ECM-800 has the most disordered structure. This is because some organic molecules cannot completely decompose at lower temperature, [2,16] thus resulting in ECM-700 has a relatively low disordered structure. Moreover, ECM-900 exhibits the lowest disordered structure due to the generation of some pseudo-graphite domain units at a higher temperature, which is similar to previous reports.…”

Section: Synthesis and Structural Analysis Of Materialsmentioning

confidence: 99%

“…Carbonaceous anodes, featured by low cost, flexible structure and high physicochemical stability, have been proven to be an effective host material to reversibly store potassium via a hybrid mechanism, namely adsorption-induced capacitive behavior and diffusion-controlled intercalation process. [12][13][14] Particularly, it is widely accepted that capacitive behavior mainly takes place at surface or near surface region, [14][15][16] which benefits fast reaction kinetics while protecting the bulk electrode structure from collapse, leading to improved rate capability and cycling stability. Furthermore, capacitive behavior has been demonstrated to be closely related to defects level in active materials; accordingly, many efforts have been devoted to regulating the microstructure or configuration of carbon with the aim of obtaining abundant defects toward high capacitive contribution, [17][18][19] in which heteroatom doping (including F, N, P, S, etc.)…”

mentioning

confidence: 99%

See 2 more Smart Citations

Unraveling the Effect of Intrinsic Carbon Defects on Potassium Storage Performance

Yuan

Shi

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Defects engineering is an attractive strategy to improve the potassium storage performance of carbon anodes. The current studies mainly focus on the introduction of external defects via heteroatom doping, however, the exploration on the effect of intrinsic defects caused by the loss of atoms or distortion in the crystal lattice on potassium storage is still lacking to date. Hence, a series of carbon materials with different intrinsic defect levels are developed via a soft-template assisted method. It is found that intrinsic defects content in carbon is synergistically determined by the application of template and pyrolysis temperature, and a higher defects content is more likely to expose enormous edge active sites. This greatly promotes K-adsorption storage during surface-induced capacitive process, and therefore a strong positive correlation between capacity/capacity retention and intrinsic defects content is confirmed. As a result, the electrode with maximum defects content realizes a good capacity and a rate capability with long cycle lifespan (225.9 mAh g −1 at 2 A g −1 over 2000 cycles). This study offers an insight into the role of intrinsic defects of carbon materials in potassium storage performance.

show abstract

Section: Resultsmentioning

confidence: 88%

Section: Synthesis and Structural Analysis Of Materialsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Unraveling the Effect of Intrinsic Carbon Defects on Potassium Storage Performance

Yuan

Shi

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Compared with the recent studies on carbon‐based PIBs anodes (Figure 2j), the OLSC exhibits an excellent rate performance and stability while ensuring a lower voltage plateau. [ 11,27,37–41 ] The full‐cell tests of OLSC further proved the practical application of OLSC in potassium‐ion batteries. As shown in Figure S7 (Supporting Information), the K 2 MnFe(CN) 6 ||OLSC full cell showed a suitable voltage plateau about 1.5 V, and a discharge capacity of 78.6 mAh g –1 after 100 cycles.…”

Section: Resultsmentioning

confidence: 94%

Bitumen‐Derived Onion‐Like Soft Carbon as High‐Performance Potassium‐Ion Battery Anode

Tan

Wang

Liu

et al. 2022

Small

View full text Add to dashboard Cite

Potassium‐ion batteries (PIBs) have been regarded as a competitive alternative for lithium‐ion batteries, owing to the natural abundance, low cost, and similar rocking‐chair working mechanism of potassium element. However, it is challenging to simultaneously prepare suitable potassium ion anode materials of low voltage plateau, high capacity, and long cycle life. In this work, onion‐like soft carbon (OLSC) of high heteroatom content is prepared by using solvent‐sensitive self‐assembly properties of asphaltene molecules. The OLSC electrode exhibits a low voltage plateau because of a high degree of graphitization. Meanwhile, it possesses excellent cycling stability and rate capability due to the high stability of the onion‐like structure and fast transport of potassium ions, the latter of which is caused by heteroatom‐induced expanded interlayers as found by first‐principle calculations. Compared with existing carbon materials, the OLSC synthesized in this study exhibits a high reversible capacity of 466 mAh g–1 at 20 mA g–1, a reversible capacity of 222 mAh g–1 and capacity retention of 95% after 1600 cycles at 1 A g–1. This work connects the nanostructure of carbon materials and electrochemical performance and provides new insights in improving carbon‐based anodes for PIBs.

show abstract

“…Among all the anodes, carbonaceous materials are highly preferable and have been extensively investigated because of their excellent electrical conductivity and chemical stability. [ 9 , 10 , 11 ] Nevertheless, K‐ions with a larger size (1.38 Å for K + versus 0.76 Å for Li + ) can induce more distinct volume variation of the host electrode and sluggish kinetics for solid‐state diffusion during intercalation/de‐intercalation process, [ 12 , 13 , 14 ] eventually leading to serious capacity decay and inferior rate. Defect engineering in carbon matrix has been proven to be an effective strategy to resolve these issues, and simultaneously contributes to breaking through theoretical capacity to a large extent.…”

Section: Introductionmentioning

confidence: 99%

Rationally Tailoring Superstructured Hexahedron Composed of Defective Graphitic Nanosheets and Macropores: Realizing Durable and Fast Potassium Storage

Yuan

Shi

et al. 2022

Advanced Science

View full text Add to dashboard Cite

Multipores engineering composed of micro/mesopores is an effective strategy to improve potassium storage performance via providing enormous adsorption sites and shortened ions diffusion distance. However, a detailed exploration of the role played by macropores in potassium storage is still lacking and has been barely reported until now. Herein, a superstructure carbon hexahedron (DGN‐900) is synthesized using poly tannic acid (PTA) as precursor. Due to the spatially confined two‐step local contraction of PTA along different directions and dimensions during pyrolysis, defective nanosheets with macropores are formed, while realizing a balance between defects content and graphitization degree by regulating temperature. The presence of macropores is conducive to accelerating electrolyte ions rapid infiltration within electrode, and its pore volume can accommodate electrode structure fluctuation upon cycling, while the most suitable ratio of defects to graphitic provides rich ions adsorption sites and sufficient electrons transfer channels, simultaneously. These advantages enable a prominent electrochemical performance in DGN‐900 electrode, including high rate (202.9 mAh g −1 at 2 A g −1 ) and long cycling stability over 2000 cycles. This unique fabrication strategy, that is, defects engineering coupled with macropores structure, makes fast and durable potassium storage possible.

show abstract

Defect‐Selectivity and “Order‐in‐Disorder” Engineering in Carbon for Durable and Fast Potassium Storage (Adv. Mater. 7/2022)

Cited by 33 publications

References 0 publications

Unraveling the Effect of Intrinsic Carbon Defects on Potassium Storage Performance

Unraveling the Effect of Intrinsic Carbon Defects on Potassium Storage Performance

Bitumen‐Derived Onion‐Like Soft Carbon as High‐Performance Potassium‐Ion Battery Anode

Rationally Tailoring Superstructured Hexahedron Composed of Defective Graphitic Nanosheets and Macropores: Realizing Durable and Fast Potassium Storage

Contact Info

Product

Resources

About