Separator modified by Ketjen black for enhanced electrochemical performance of lithium–sulfur batteries

Zhao, Di; Qian, Xinye; Jin, Lina; Yang, Xiaolong; Wang, Shanwen; Shen, Xiangqian; Yao, Shanshan; Rao, Dewei; Zhou, Yong; Xi, Xiaoming

doi:10.1039/c5ra26476f

Cited by 59 publications

(27 citation statements)

References 30 publications

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“…Figure f–i and Figure S3 in the Supporting Information show scanning electron microscopy (SEM) images of the pristine separator and the MoO 3 ‐modified separator under different magnification. The pristine separator contains slit‐like porous structure of around several hundred nanometers, which allows easy penetration of electrolyte, fast lithium‐ion transportation, and electronic transfer during redox reactions . The SEM images of the coated separator clearly reveal that the latter is fully coated with the MoO 3 layer and the structure of the MoO 3 is like a nanobelt, consistent with XRD patterns (Figure S1b, Supporting Information) and literature .…”

Section: Resultssupporting

confidence: 82%

“…The digital images of the coated separator demonstrate that the polypropylene separator is completely coated with MoO 3 ( Figure a and b). The MoO 3 ‐modified separator has the ability to hold its initial shape after being fully folded or crumpled (Figure c‐e), which suggests that MoO 3 is thoroughly bound to the separator and has high mechanical strength, robust structure, and sufficient flexibility …”

Section: Resultsmentioning

confidence: 99%

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Electrocatalysis on Separator Modified by Molybdenum Trioxide Nanobelts for Lithium–Sulfur Batteries

Imtiaz

Zafar

Razaq

et al. 2018

Adv Materials Inter

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has substantially increased. [1] Accordingly, lithium-sulfur batteries (LSBs) have gained much attraction as future-generation rechargeable batteries due to the exceptional-specific energy density of 2600 Wh kg −1 and theoretical-specific capacity of 1675 mAh g −1 , which are significantly higher than those of the traditional lithium-ion batteries. [2] Regardless of the great potential, LSBs face some great challenges that hinder their commercialization. Some of the major challenges are the low active material utilization, which is a consequence of the insulating nature of orthorhombic sulfur and its discharged products, volume expansion during redox reactions, and shuttle effect that occurs due to dissolution of long-chain lithium polysulfides (Li 2 S x , 4 ≤ x ≤ 8) into the electrolyte, allowing the formation of insoluble, insulating Li 2 S 2 /Li 2 S precipitates on the surface of lithium anode and sulfur cathode. The dissolution of polysulfides not only retards the reaction kinetics of the electrodes, but also causes low Coulombic efficiency, rapid capacity fading, and poor cycle life of the LSBs. [3] Meanwhile, the lithium is highly reactive and the gas generation during cycling also results in speedy capacity degradation of LSBs. [4] Lithium-sulfur batteries (LSBs) have been regarded as the supreme feasible future generation energy storage system for high-energy applications due to the exceptional-specific energy density of 2600 Wh kg −1 and theoretical-specific capacity of 1675 mAh g −1 . Nevertheless, some key challenges which are linked with polysulfide shuttling and sluggish kinetics of polysulfide conversion are the main obstacles in the high electrochemical performance of LSBs. Here, a molybdenum trioxide (MoO 3 ) nanobelt catalytic layer is fabricated on the separator to solve these issues. The MoO 3 layer shows strong chemical interaction with polysulfides by successfully blocking the polysulfides on the separator from shuttling and significantly accelerates the redox reaction of polysulfide conversion. Furthermore, the randomly arranged layers of MoO 3 nanobelts possess enough porous networks that provide effective space for electrolyte infiltration and facile pathway for fast ion transportation. The resultant LSBs exhibit a very high initial capacity of 1377 mAh g −1 . After 200 cycles at 0.5 C, the capacity is 684.4 mAh g −1 with the fading rate of only 0.251% per cycle. Additionally, the MoO 3 modification provides good surface protection of lithium anode and depresses the lithium anode degradation. Battery Performance

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Electrocatalysis on Separator Modified by Molybdenum Trioxide Nanobelts for Lithium–Sulfur Batteries

Imtiaz

Zafar

Razaq

et al. 2018

Adv Materials Inter

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“…Other commercial carbon materials, such as Ketjen black, have also been used to preparet he coated separator to suppress the shuttle effect in Li-S batteries (Table 2entry 3). [79] The porous features of the carbon coating layer influences the battery performance of the separator.O no ne hand, ac arbon layer with disordered pore structure is beneficialf or the trapping andr eactivation of the polysulfide. On the other hand, ah ighly porous carbon coating has al ow weight, which helps to increase the energy density of the battery.B alach et al fabricated am esoporous carbon( m-C) with ah igh surface area of 843 m 2 g À1 and coated the m-C onto aP Ps eparator.…”

Section: Carbonaceous Material-coated Polyolefin Separatorsmentioning

confidence: 96%

“…Additionally, the self‐discharge of the Li–S battery can be well suppressed. Other commercial carbon materials, such as Ketjen black, have also been used to prepare the coated separator to suppress the shuttle effect in Li–S batteries (Table entry 3) …”

Section: Advanced Separators For Li–s Batteriesmentioning

confidence: 99%

Advanced Separators for Lithium‐Ion and Lithium–Sulfur Batteries: A Review of Recent Progress

et al. 2016

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Li-ion and Li-S batteries find enormous applications in different fields, such as electric vehicles and portable electronics. A separator is an indispensable part of the battery design, which functions as a physical barrier for the electrode as well as an electrolyte reservoir for ionic transport. The properties of the separators directly influence the performance of the batteries. Traditional polyolefin separators showed low thermal stability, poor wettability toward the electrolyte, and inadequate barrier properties to polysulfides. To improve the performance and durability of Li-ion and Li-S batteries, development of advanced separators is required. In this review, we summarize recent progress on the fabrication and application of novel separators, including the functionalized polyolefin separator, polymeric separator, and ceramic separator, for Li-ion and Li-S batteries. The characteristics, advantages, and limitations of these separators are discussed. A brief outlook for the future directions of the research in the separators is also provided.

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“…Unfortunately, because of the weak adsorption between the polar polysulfides and nonpolar carbon, the shuttle effect of soluble polysulfides cannot be effectively suppressed with these separators. [14][15][16] Modifying the carbon-coating layer with polysulfide anchoring materials, such as polar metal oxides [17][18][19][20][21][22][23][24] and polymers, [25][26][27][28][29] and MXene 30 can bring additional advantages and thus effectively restrain the shuttle effect of polysulfide. The trapped polysulfide on the modified carbon layer is expected to block the Li + diffusion channels.…”

mentioning

confidence: 99%

Improve redox activity and cycling stability of the lithium‐sulfur batteries via in situ formation of a sponge‐like separator modification layer

Pang

Xiao

et al. 2020

Int J Energy Res

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Summary The electronic nonconductivity of S and shuttle effect of soluble polysulfides are two fundamental issues that limit the application of lithium‐sulfur (Li‐S) batteries. Regarding these issues, herein, a sponge‐like Ketjen black (KB)‐triphenylphosphine sulfide (TPS) multifunctional modification layer was proposed to coat the separator of the advanced Li‐S batteries. The layer was formed by an in situ spontaneous reaction between triphenylphosphine (TPP) of the conventional KB‐TPP layer and Li2S6 solution. This functional layer can ensure a high e− and Li+ conductivity while inhibiting the diffusion of soluble polysulfides. As a result, the redox activity, rate capability, and cycling stability of the batteries are significantly enhanced. Comparing with the discharge capacities at 2C for the PE separator, introducing the KB‐TPS functional layer was beneficial for the capacity retentions of the cells, since the capacity increased from 16.1% to 66.6% at the same C‐rate. A capacity degeneration rate of 0.045% per cycle was obtained for the cell with an S area density of 3.6 mg cm−2. This work is a step forward in the exploration of advanced Li‐S batteries, being a valuable reference for the study of related systems.

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Separator modified by Ketjen black for enhanced electrochemical performance of lithium–sulfur batteries

Abstract: A routine separator modified by a Ketjen black (KB) layer on the cathode side has been investigated to improve the electrochemical performances of Li–S batteries.

Cited by 59 publications

References 30 publications

Electrocatalysis on Separator Modified by Molybdenum Trioxide Nanobelts for Lithium–Sulfur Batteries

Electrocatalysis on Separator Modified by Molybdenum Trioxide Nanobelts for Lithium–Sulfur Batteries

Advanced Separators for Lithium‐Ion and Lithium–Sulfur Batteries: A Review of Recent Progress

Improve redox activity and cycling stability of the lithium‐sulfur batteries via in situ formation of a sponge‐like separator modification layer

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