Process optimization for producing hierarchical porous bamboo-derived carbon materials with ultrahigh specific surface area for lithium-sulfur batteries

Yan, Yinglin; Shi, Mangmang; Wei, Yiqi; Zhao, Chao; Carnie, Matthew J.; Yang, Rong; Xu, Yunhua

doi:10.1016/j.jallcom.2017.11.212

Cited by 62 publications

(17 citation statements)

References 36 publications

(54 reference statements)

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“…The high sulfur utilization and cycling performance is much better than most previously reported high sulfur loading cathodes . In contrast, the S/NCNT@SnS 2 electrodes remaining capacity and capacity retention are only 346 mA h g −1 and 32.7% (calculated based on the fifth cycle), respectively . Figure S14 (Supporting Information) demonstrates that the energy efficiency of S/NCNT@Co‐SnS 2 electrodes is higher than that of S/NCNT@SnS 2 electrodes.…”

Section: Resultsmentioning

confidence: 83%

Cobalt‐Doped SnS₂ with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Gao

Yang

et al. 2019

Adv Funct Materials

197

114

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The application of Li-S batteries is hindered by low sulfur utilization and rapid capacity decay originating from slow electrochemical kinetics of polysulfide transformation to Li 2 S at the second discharge plateau around 2.1 V and harsh shuttling effects for high-S-loading cathodes. Herein, a cobalt-doped SnS 2 anchored on N-doped carbon nanotube (NCNT@Co-SnS 2 ) substrate is rationally designed as both a polysulfide shield to mitigate the shuttling effects and an electrocatalyst to improve the interconversion kinetics from polysulfides to Li 2 S. As a result, high-S-loading cathodes are demonstrated to achieve good cycling stability with high sulfur utilization. It is shown that Co-doping plays an important role in realizing high initial capacity and good capacity retention for Li-S batteries. The S/NCNT@Co-SnS 2 cell (3 mg cm −2 sulfur loading) delivers a high initial specific capacity of 1337.1 mA h g −1 (excluding the Co-SnS 2 capacity contribution) and 1004.3 mA h g −1 after 100 cycles at a current density of 1.3 mA cm −2 , while the counterpart cell (S/NCNT@SnS 2 ) only shows an initial capacity of 1074.7 and 843 mA h g −1 at the 100th cycle. The synergy effect of polysulfide confinement and catalyzed polysulfide conversion provides an effective strategy in improving the electrochemical performance for high-sulfur-loading Li-S batteries.

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Section: Resultsmentioning

confidence: 83%

Cobalt‐Doped SnS₂ with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Gao

Yang

et al. 2019

Adv Funct Materials

197

114

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“…The Brunauer–Emmett–Teller (BET) measurement data were also analyzed by different models including density functional theory (DFT), Langmuir, Barrett–Joyner–Halenda (BJH), and Satio–Foley (SF). The reasons for recalculation were that those methods were more suitable for calculation of micro‐ or mesopores . The results are also listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Improving Supercapacitance of Electrospun Carbon Nanofibers through Increasing Micropores and Microporous Surface Area

Wang

et al. 2019

Adv Materials Inter

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Previous papers about electrospun carbon nanofibers do not provide systemic understandings about how in situ activation agents affect the porous structure of carbon nanofibers. In this study, poly(vinylpyrrolidone), poly(methyl methacrylate), and high‐amylose starch (HAS) are used as activation agent to separately prepare porous carbon nanofibers from electrospun polyacrylonitrile nanofibers, and the effects of the polymer activation agents on the porous structure and supercapacitive properties of the resulting carbon nanofibers are examined. The studies indicate that melting point and decomposition temperature are two important parameters deciding the pore size profile. The one with high melting point and low decomposition temperature, such as HAS, allows to form micropore‐dominant porous structure with large specific surface area. The HAS‐activated carbon nanofibers have a micropore specific surface area as high as ≈809 m2 g−1, total pore volume of ≈0.42 cm3 g−1, and micropore content as high as ≈59%. The corresponding electrodes have a capacitance of 282 F g−1 at the current density of 1.0 A g−1 with excellent cycling durability. These novel understandings may be useful for the development of effective carbon nanofibers for high‐performance supercapacitor and other applications.

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“…But they still cannot satisfy the urgent requirements for emerging technology, such as large‐scale energy storage and electric vehicles (EVs) . Because of the ultrahigh theoretical capacity (1675 mAh g −1 ) and theoretical energy density (2600 Wh kg −1 ) of sulfur cathode materials, lithium‐sulfur (Li‐S) batteries have drawn considerable attention with the assistance of abundance in nature and environment‐friendliness of S …”

Section: Introductionmentioning

confidence: 99%

“…2 But they still cannot satisfy the urgent requirements for emerging technology, such as largescale energy storage and electric vehicles (EVs). 3 Because of the ultrahigh theoretical capacity (1675 mAh g −1 ) and theoretical energy density (2600 Wh kg −1 ) of sulfur cathode materials, lithium-sulfur (Li-S) batteries have drawn considerable attention with the assistance of abundance in nature and environment-friendliness of S. 4,5 Despite these advantages of S cathodes, some drawbacks still hinder the practical application of Li-S batteries, such as (a) the poor electrical insulation of S (5 × 10 −30 S cm −1 at 25°C) and corresponding sulfides during cycling 6,7 ; (b) the noticeable volume changes (80%) of S cathode during the cycling 8 ; and (c) the dissolution of intermediates, as known, polysulfide (Li 2 S x , 4 ≤ x ≤ 8), 9 which would shuttle between two electrodes, leading to severe capacity fading and the deterioration of electrochemical performance. 10,11 Many research work have been made to solve these aforementioned problems.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

et al. 2019

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Summary Carbon aerogel (CA), possessing abundant pore structures and excellent electrical conductivity, have been utilized as conductive sulfur hosts for lithium‐sulfur (Li‐S) batteries. However, a serious shuttle effect resulted from polysulfide ions has not been effectively suppressed yet due to the weak absorption nature of CA, resulting in rapid decay of capacity as the cycle number increases. Herein, ultrafine (~3 nm) gadolinium oxide (Gd2O3) nanoparticles (with upper redox potential of ~ 1.58 V versus Li+/Li) are uniformly in‐situ integrated with CA through directly sol‐gel polymerization and high‐temperature carbonization. The Gd2O3 modified CA composites (named as Gdx‐CA, where x means molar ratio of Gd2O3 nanoparticles to carbon) are incorporated with S. Then, the products (S/Gdx‐CA) are acted as sulfur host materials for Li‐S batteries. The results demonstrate that adding ultrafine Gd2O3 nanoparticles can dramatically improve the electrochemical properties of the composite cathodes. The S/Gd2‐CA electrode (loading with 58.9 wt% of S) possesses the best electrochemical properties, including a high initial capacity of 1210 mAh g−1 and a relatively high capacity of 555 mAh g−1 after 50 cycles at 0.1 C. It is noteworthy that the performance of long‐term cycle (350 cycles) for the S/Gd2‐CA (317 mAh g−1 after 100 cycles and 233 mAh g−1 after 350 cycles at 1 C) is improved significantly than that of S/CA (150 mAh g−1 after 150 cycles at 1 C). Overall, the enhancement of electrochemical performances can be due to the strong polar nature of the ultrafine Gd2O3 nanoparticles, which provide strong adsorption sites to immobilize S and polysulfide. Furthermore, the Gd2O3 nanoparticles present a catalytic effect. Our research suggests that adding Gd2O3 nanoparticles into S/CA composite cathode is an effective and novelty method for improving the electrochemical performances of Li‐S batteries.

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Process optimization for producing hierarchical porous bamboo-derived carbon materials with ultrahigh specific surface area for lithium-sulfur batteries

Abstract: Process optimization for producing hierarchical porous bamboo-derived carbon materials with ultrahigh specific surface area for lithium-sulfur batteries.

Cited by 62 publications

References 36 publications

Cobalt‐Doped SnS₂ with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Cobalt‐Doped SnS₂ with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Improving Supercapacitance of Electrospun Carbon Nanofibers through Increasing Micropores and Microporous Surface Area

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

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Process optimization for producing hierarchical porous bamboo-derived carbon materials with ultrahigh specific surface area for lithium-sulfur batteries

Abstract: Process optimization for producing hierarchical porous bamboo-derived carbon materials with ultrahigh specific surface area for lithium-sulfur batteries.

Cited by 62 publications

References 36 publications

Cobalt‐Doped SnS2 with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Cobalt‐Doped SnS2 with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Improving Supercapacitance of Electrospun Carbon Nanofibers through Increasing Micropores and Microporous Surface Area

Fabrication of ultrafine Gd2O3nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries

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Resources

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Cobalt‐Doped SnS₂ with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Cobalt‐Doped SnS₂ with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

Fabrication of ultrafine Gd₂O₃nanoparticles/carbon aerogel composite as immobilization host for cathode for lithium‐sulfur batteries