Nanopore separator of cross-linked poly(propylene glycol)-<i>co</i>-pentaerythritol triacrylate for effectively suppressing polysulfide shuttling in Li–S batteries

Li, Haixia; Tang, Wentao; Huang, Yifu; Ruan, Wei; Zhang, Mingqiu

doi:10.1039/c9py00206e

Cited by 8 publications

(7 citation statements)

References 38 publications

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“…A low discharge capacity of just 151 mA h g −1 after 100 th discharge cycle was retained by the Li-S cell with PP separator. The fast capacity fade could be associated with the highly porous structure of PP separator which is permeable to Li polysulfides and the Li dendrites 71,72 . It is worth mentioning that the extended voltage profile is observed during initial charging cycle in Li-S cell with pristine PP separator triggering longer charge times before attaining the upper cut off voltage, which could possibly be associated either with the Li polysulfide shuttling phenomenon during charging process 73 or with the lower open circuit voltage of the cell 74 (lower discharge capacity was observed for the initial cycle).…”

Section: Resultsmentioning

confidence: 99%

“…It is clear that the Li-S constructed with PP separator displayed a sharp decrease in the capacity in the initial cycles and finally attaining a lower values of stable specific capacity after 100 cycles with an overall efficiency of less than 97%. The huge capacity fade in conventional Li-S cell may be ascribed to the diffusion of Li polysulfides through porous PP separator, leading to the active material loss and the inimical reactions taking place at the Li anode resulting in corrosion of Li metal and the electrolyte exhaustion 71 . The Li-S cell containing Nb-PP separator exhibited a relatively stable cyclic behaviour and good capacity retention after 100 galvanostatic cycles with nearly 100% cycling efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Metal Coated Polypropylene Separator with Enhanced Surface Wettability for High Capacity Lithium Metal Batteries

Din

Murugan

2019

Sci Rep

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Lithium metal batteries are among the strong contenders to meet the increasing energy demands of the modern world. Metallic lithium (Li) is light in weight, possesses very low standard negative electrochemical potential and offers an enhanced theoretical capacity (3860 mA h g−1). As a negative electrode Li paves way to explore variety of elements including oxygen, sulfur and various other complex oxides as potential positive electrodes with a promise of much higher energy densities than that of conventional positive electrodes. However, there are technical challenges in utilizing metallic lithium due to its higher reactivity towards liquid electrolytes and higher affinity to form Li dendrites, leading to serious safety concerns. Here, we report on preparation of niobium (Nb) metal-coated binder-free and highly hydrophilic polypropylene separator prepared via radio frequency (RF) magnetron sputtering. Thin layer of niobium metal (Nb) particles were deposited onto the polypropylene (PP) sheet for various time periods to achieve desired coating thickness. The as-prepared separator revealed excellent hydrophilic behaviour due to enhanced surface wettability. Symmetric cells display reduced interface resistance and uniform voltage profiles for 1000 cycles with reduced polarization at higher current densities suggesting smooth stripping and plating of Li and homogeneous current distribution at electrode/electrolyte interface under room temperature conditions. Nb nanolayer protected separator with LiNi0.33M0.33Co0.33O2 (LNMC) and composite sulfur cathodes revealed an enhanced cycling stability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Metal Coated Polypropylene Separator with Enhanced Surface Wettability for High Capacity Lithium Metal Batteries

Din

Murugan

2019

Sci Rep

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“…New heat‐resistant separators have been developed with high melting points and low thermal shrinkage . Zhu et al prepared a rGO‐PVDF/PVDF composite nanofiber separator via electrospinning.…”

Section: Separators With High Thermal Tolerancementioning

confidence: 99%

Mechanistic understanding of the role separators playing in advanced lithium‐sulfur batteries

Wei

Ren

Sokolowski

et al. 2020

InfoMat

233

147

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The lithium-sulfur battery is considered one of the most promising candidates for portable energy storage devices due to its low cost and high energy density.However, many critical issues, including polysulfide shuttling, self-discharge, lithium dendritic growth, and thermal hazards need to be addressed before the commercialization of lithium-sulfur batteries. To this end, tremendous efforts have been made to explore battery configurations and components, such as electrodes, electrolytes, and separators, among which the separator plays an especially critical role in addressing aforementioned issues. Thus, this review analyzes the mechanisms and interactions of these critical issues and summarizes both the function of separators and recent progress made towards remedying such issues. Additionally, promising directions for the development of separators in lithium-sulfur batteries are proposed. K E Y W O R D Slithium dendrite, lithium-sulfur batteries, self-discharge, separator, shuttle effect, thermal hazardsThe first two authors contributed equally to this work.

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“…Interaction with polar solvents or electrolytes is accordingly quite favorable, and an application as a separating membrane in lithium-sulfur batteries seems promising. 25 Crucially, with the recently developed catalyst systems for preparing UHMW-PPO and its copolymers, it should be possible to control the crosslink density over a wide range. Atactic PPO is fully amorphous, in significant contrast to PEO, for which very high molar masses have long been established and have gained practical relevance.…”

Section: Synpacts Syn Lettmentioning

confidence: 99%

Ultrahigh-Molecular-Weight Poly(propylene oxide): Preparation and Perspectives

Walther¹,

Vogler²,

Naumann³

2019

Synlett

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Conventional approaches for polymerizing substituted epoxides, especially propylene oxide, suffer from side reactions, severely limiting molar masses and control over the end groups of the resulting poly(propylene oxide) (PPO). This has not only complicated the incorporation of PPO moieties into complex defined polymer architectures, but has also hampered consideration of PPO as an interesting material in its own right. In this context, a concise summary of strategies for creating truly high-molecular-mass polyethers is provided, with a focus on a recently developed dual catalytic setup that permits access to PPO molar masses of 106 g/mol and beyond. Based on these advances in the catalytic preparation of polyethers, future perspectives for ultrahigh-molecular-weight (UHMW) PPO as a performance material are identified.

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Nanopore separator of cross-linked poly(propylene glycol)-co-pentaerythritol triacrylate for effectively suppressing polysulfide shuttling in Li–S batteries

Abstract: A nanopore polymer separator blocks the polysulfide migration more efficiently than the Celgard separator, endowing a Li–S battery with a much better discharge performance.

Cited by 8 publications

References 38 publications

Metal Coated Polypropylene Separator with Enhanced Surface Wettability for High Capacity Lithium Metal Batteries

Metal Coated Polypropylene Separator with Enhanced Surface Wettability for High Capacity Lithium Metal Batteries

Mechanistic understanding of the role separators playing in advanced lithium‐sulfur batteries

Ultrahigh-Molecular-Weight Poly(propylene oxide): Preparation and Perspectives

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