A Novel Cathode Based on Selenium Confined in Biomass Carbon and Graphene Oxide for Potassium‐Selenium Battery

Cai, Ruizheng; Chen, Xinxin; Liu, Penggao; Chen, Tao; Liu, Weifang; Fan, Xiaowen; Ouyang, Baixue; Chen, Tao

doi:10.1002/celc.202001178

Cited by 15 publications

(9 citation statements)

References 36 publications

(65 reference statements)

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“…PC/Se/GO [66] 40 0.8 m KPF 6 in EC/DEC 0.5-2.5 0.5C/150/316.8 c-PAN-Se [32] 39 1 m KPF 6 in EC/PC 0.7-2.3 5C/200/175 Se@NPCFs [38] 62 0.7 m KPF 6 in EC/DEC 0.5-3.0 0.5 A g −1 /1675/367 Se@NPCS [35] 60 1 m KPF 6 in EC/PC 0.5-2.5 0.5C/300/314 SeS 2 @NCNFs [77] 57 0.7 m KPF 6 in EC/DEC 0.5-2.8 0.5 A g −1 /1000/417 OC/SeS 2 [78] 39.4 1 m KPF 6 in EC/PC 0.5-2.5 0.5 A g −1 /500/216…”

Section: Methodsmentioning

confidence: 99%

“…For example, Wang and co‐workers harnessed natural cotton fibers to synthesize a N‐doped porous carbon (NDPC) by rational annealing and activation ( Figure a), which presented a 3D interconnected foam‐like morphology (labeled as FNDPC), as displayed in Figure 11b,c. [ 66 ] The NDPC proposal realized a perfect combination of multiple advantages. Firstly, the 3D interlinked porous architecture exhibits favorable channels for electrolyte penetration and also robustly relieves the volume change of cathode materials upon cycling.…”

Section: Cathode Materials Designmentioning

confidence: 99%

“…Walnut shells were used to fabricate a PC carrier for Se by Liu and co‐workers, and additionally, graphene was further composited with the as‐obtained PC/Se composite to produce a PC/Se/GO composite. [ 66 ] When applying the PC/Se/GO composite in assembled K–Se batteries, it delivered a high initial capacity of 1050 mA h g −1 and still maintained a capacity of 316 mA h g −1 after 150 cycles at 0.5C. The high capacity resulted from two main causes: 1) the unique porous carbon structure endowing a high electronic conductivity of the underlying carbon carrier and mitigation of the large volume expansion of Se species during redox reactions; 2) the added graphene was able to preserve the structural integrity of cathode as well as facilitating fast electron/ion transfer.…”

Section: Cathode Materials Designmentioning

confidence: 99%

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Rechargeable Potassium–Selenium Batteries

Huang

Guo

Dou

et al. 2021

Adv Funct Materials

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Rechargeable potassium-selenium (K-Se) batteries, as an emerging electrochemical energy storage system, has recently captured intensive attention due to the desirable natural abundance and low redox potential of elemental potassium as well as the relatively high electronic conductivity and impressive theoretical volumetric capacity of elemental selenium. Although great progress on cathode materials design and electrochemical performance improvement has been made, K-Se batteries are still confronted with a series of key challenges, including low reactive activity, shuttle effect, volume expansion, potassium dendrite growth, and high chemical activity of potassium metal. The recent advances in rechargeable K-Se batteries are comprehensively summarized with an emphasis on discussing the electrochemical mechanisms and central challenges, presenting the synthesis, properties, and electrochemical performance of selenium-based cathode materials, and extending potential tactics for tackling the key issues and developmental directions for future research.

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Section: Methodsmentioning

confidence: 99%

Section: Cathode Materials Designmentioning

confidence: 99%

Section: Cathode Materials Designmentioning

confidence: 99%

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Rechargeable Potassium–Selenium Batteries

Huang

Guo

Dou

et al. 2021

Adv Funct Materials

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“…The approach of establishing selenium/carbon composites was widely employed. By virtue of versatile architecture, porosity, and surface chemistry of carbon matrices, the electrochemical behaviors of the selenium phase in the composite, e.g., reaction activity, volume change, and polyselenide translation, have been effectively optimized. , Selenium chemistry modulations including but not limited to tuning of the selenium molecular configuration, , functionalization of the selenium–matrix interface, , adjustment of the electrolyte composition, or a combination of multiple strategies are effective in changing the intrinsic electronic conductivity, reaction pathway, and ion diffusion kinetics. As a result, the electrochemical performances of K–Se batteries have been greatly improved in terms of specific capacity and long-term cycling stability. , However, due to the extremely sluggish diffusion kinetics of large K + ions, it is still a great challenge to develop a selenium cathode with superior rate capability and high power characteristics.…”

Section: Introductionmentioning

confidence: 99%

Toward Theoretical Capacity and Superhigh Power Density for Potassium–Selenium Batteries via Facilitating Reversible Potassiation Kinetics

Ding

Wang

Huang

et al. 2022

ACS Appl. Mater. Interfaces

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Potassium−selenium (K−Se) batteries attract tremendous attention because of the two-electron transfer of the selenium cathode. Nonetheless, practical K− Se cells normally display selenium underutilization and unsatisfactory rate capability. Herein, we employ a synergistic spatial confinement and architecture engineering strategy to establish selenium cathodes for probing the effect of K + diffusion kinetics on K−Se battery performance and improving the charge transfer efficiency at ultrahigh rates. By impregnating selenium into hollow and solid carbon spheres with similar diameters and porous structures, the obtained parallel Se/C composites possess nearly identical selenium loadings, molecular structures, and heterogeneous interfaces but enormously different paths for K + diffusion. Remarkably, as the solid-state K + diffusion distance is significantly reduced, the K−Se cell achieves 96% of 2e − transfer capacity (647.1 mA h g −1 ). Reversible capacities of 283.5 and 224.1 mA h g −1 are obtained at 7.5 and 15C, respectively, corresponding to an unprecedented high power density of 8777.8 W kg −1 . Quantitative kinetic analysis demonstrated a twofold higher capacitive charge storage contribution and a 1 order of magnitude higher K + diffusion coefficient due to the short K + diffusion path. By combining the determination of potassiation products by ex situ characterization and density functional theory (DFT) calculations, it is identified that the kinetic factor is decisive for K−Se battery performances.

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“…Lithium–ion batteries (LIBs), commercialized since the 1990s, have been leading the secondary battery market [ 1 , 2 ]. However, the development of LIBs is constrained by their limited theoretical energy density [ 3 , 4 , 5 ]. The booming Li-S battery has emerged as the most prospective battery due to its salient theoretical specific capacities of lithium and sulfur [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube-Modified Nickel Hydroxide as Cathode Materials for High-Performance Li-S Batteries

Jin

Yan

et al. 2022

Nanomaterials

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The advantages of high energy density and low cost make lithium–sulfur batteries one of the most promising candidates for next-generation energy storage systems. However, the electrical insulativity of sulfur and the serious shuttle effect of lithium polysulfides (LiPSs) still impedes its further development. In this regard, a uniform hollow mesoporous Ni(OH)2@CNT microsphere was developed to address these issues. The SEM images show the Ni(OH)2 delivers an average size of about 5 μm, which is composed of nanosheets. The designed Ni(OH)2@CNT contains transition metal cations and interlayer anions, featuring the unique 3D spheroidal flower structure, decent porosity, and large surface area, which is highly conducive to conversion systems and electrochemical energy storage. As a result, the as-fabricated Li-S battery delivers the reversible capacity of 652 mAh g−1 after 400 cycles, demonstrating excellent capacity retention with a low average capacity loss of only 0.081% per cycle at 1 C. This work has shown that the Ni(OH)2@CNT sulfur host prepared by hydrothermal embraces delivers strong physical absorption as well as chemical affinity.

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A Novel Cathode Based on Selenium Confined in Biomass Carbon and Graphene Oxide for Potassium‐Selenium Battery

Cited by 15 publications

References 36 publications

Rechargeable Potassium–Selenium Batteries

Rechargeable Potassium–Selenium Batteries

Toward Theoretical Capacity and Superhigh Power Density for Potassium–Selenium Batteries via Facilitating Reversible Potassiation Kinetics

Carbon Nanotube-Modified Nickel Hydroxide as Cathode Materials for High-Performance Li-S Batteries

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