Enabling rapid polysulfide conversion kinetics by using functionalized carbon nanosheets as metal-free electrocatalysts in durable lithium-sulfur batteries

Ruan, Songju; Huang, Zhichao; Cai, Wendi; Ma, Cheng; Liu, Xiaojun; Wang, Jitong; Qiao, Wenming; Ling, Licheng

doi:10.1016/j.cej.2019.123840

Cited by 44 publications

(20 citation statements)

References 53 publications

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“…For the electrodes with both 15 and 30 % CoC 2 O 4 , conventional two redox peak patterns were observed. The two redox peaks observed at ‐0.1 V and ‐0.35 V in the cathodic scan (0.1 V and 0.35 V in the anodic scan) corresponded to the reduction reaction of a longer‐chain (Li 2 S x , 4≤ x ≤8) and a shorter‐chain (Li 2 S x , 2≤ x ≤4) LiPS, respectively [25–27] . Notably, an additional peak over 0 V has rarely been reported in the CV studies of symmetric cells with liquid Li 2 S 6 .…”

Section: Resultsmentioning

confidence: 95%

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC₂O₄ as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

et al. 2020

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The performance of cobalt oxalate as an electrocatalyst in a lithium‐sulfur battery (LSB) is improved owing to the suitable adsorbent properties of sulfur. The adsorption mechanism is elucidated by UV/Vis spectroscopy and surface analysis through X‐ray photoelectron spectroscopy. Li2S6 is converted into thiosulfate and polythionate by a catenation reaction on the interfacial boundary of CoC2O4 contacted with carbon. Following this, the active polythionate and short‐chained liquid lithium polysulfides (LiPS) bound to the cobalt surface are further reduced as CoC2O4 reduces the overpotential to facilitate the LiPS redox reaction, leading to high specific capacity, lower self‐discharge rate, and stable long‐term cycling performance.

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Section: Resultsmentioning

confidence: 95%

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC₂O₄ as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

et al. 2020

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“…We can see that the coating of the CNTs@CP/rGO does not increase the resistance of the separator. This result could be attributed to the abundant mesopores of CNTs@CP/rGO providing a highway for Li + ion transfer and the adsorbed electronegative components on CNTs@CP/rGO allowing for hopping transfer of the positively charged Li + ions. , …”

Section: Resultsmentioning

confidence: 99%

“…This result could be attributed to the abundant mesopores of CNTs@CP/rGO providing a highway for Li + ion transfer and the adsorbed electronegative components on CNTs@CP/rGO allowing for hopping transfer of the positively charged Li + ions. 40,57 The electrochemical performances of Li−S batteries using the as-prepared CNTs@CP/rGO separator were tested to evaluate the advantages of this multifunctional separator. To highlight the effect of the CNTs@CP/rGO separator, we prepared the sulfur cathode without any other polysulfide hosts.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Cationic-Polymer-Functionalized Separator As a High-Efficiency Polysulfide Shuttle Barrier for Long-Life Li–S Battery

Jiao

et al. 2021

ACS Appl. Energy Mater.

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Because of the advantages of high theoretical capacity, low cost, and environmental friendliness, lithium−sulfur (Li−S) batteries have attracted wide attention as promising energy storage system for electric vehicles and smart power grids. However, their commercialization is still greatly restricted by their poor cycle stability, resulting from the severe shuttling of soluble lithium polysulfides (LiPSs) during cycling. Herein, we designed a CNT@cationic polymer/rGO (CNT@CP/rGO) blocking layer on a commercial PP separator. Such a blocking layer can strongly fix LiPSs by the electrostatic attraction effect between the cationic polymer backbones and the polysulfide anions. As a result, a Li−S battery equipped with a CNTs@CP/ rGO-functionalized separator showed much improved cycling stability with a capacity fading rate as low as 0.06% per cycle during 700 cycles at 1 C. Especially, high areal capacity of 6.3 mAh cm −2 was also achieved with a high sulfur loading of 8.5 mg cm −2 after 50 cycles. This work highly emphasizes that the electrostatic attraction mechanism between cationic polymers and polysulfides can effectively restrain the polysulfide shuttling and thus significantly improve the electrochemical performance of Li−S batteries.

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“…However, recent research found that if the sluggish redox kinetics, with increased internal resistance cause low S/Se utilization and poor Coulombic efficiency (CE) did not address (Gu and Lai, 2019;He and Manthiram, 2019;Lim et al, 2019;Song et al, 2019;Ruan et al, 2020) the cathode problems of Li-S/Se batteries, these problems would be impossible to solve completely even if the immediate shuttle effect was effectively restrained using various carbon-based hosts. Therefore, researchers around the world are gradually focusing on how to improve redox kinetics and limit the shuttle effects of LiPS/LiPSe simultaneously (Zhang et al, 2019f;Hong et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Metal Atom-Decorated Carbon Nanomaterials for Enhancing Li-S/Se Batteries Performances: A Mini Review

Deng

Ren

2021

Front. Energy Res.

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Lithium-sulfur (Li-S) and lithium-selenium (Li-Se) batteries are both facing the cathode issues of low Coulombic efficiency and unstable cycling stability due to the severe shuttle effect of lithium polysulfides or lithium polyselenides. Simultaneously inhibiting polysulfides/polyselenides dissolution in organic electrolytes and propelling them to conversion via introducing polar, catalytic materials has been proven as an effective strategy to enhance the durability of Li-S and Li-Se batteries. In this mini review, we systematically introduce various metal atom-decorated carbon nanomaterials to determine how to enhance the electrochemical performances of Li-S and Li-Se batteries by inhibiting the polysulfides/polyselenides shuttle phenomenon as well as catalyzing them toward quick redox conversions. We also briefly include the drawbacks and bottlenecks of this kind of material when used in Li-S and Li-Se batteries

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Enabling rapid polysulfide conversion kinetics by using functionalized carbon nanosheets as metal-free electrocatalysts in durable lithium-sulfur batteries

Cited by 44 publications

References 53 publications

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC₂O₄ as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC₂O₄ as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

Cationic-Polymer-Functionalized Separator As a High-Efficiency Polysulfide Shuttle Barrier for Long-Life Li–S Battery

Metal Atom-Decorated Carbon Nanomaterials for Enhancing Li-S/Se Batteries Performances: A Mini Review

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Enabling rapid polysulfide conversion kinetics by using functionalized carbon nanosheets as metal-free electrocatalysts in durable lithium-sulfur batteries

Cited by 44 publications

References 53 publications

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC2O4 as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC2O4 as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

Cationic-Polymer-Functionalized Separator As a High-Efficiency Polysulfide Shuttle Barrier for Long-Life Li–S Battery

Metal Atom-Decorated Carbon Nanomaterials for Enhancing Li-S/Se Batteries Performances: A Mini Review

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Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC₂O₄ as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC₂O₄ as a Polysulfide Catenator for a High‐Capacity Lithium‐Sulfur Battery