Novel functional separator with self-assembled MnO2 layer via a simple and fast method in lithium-sulfur battery

Wang, Xin; Yang, Liwen; Wang, Yang; Li, Qian; Chen, Changtao; Zhong, Benhe; Chen, Yanxiao; Guo, Xiaodong; Wu, Zhenguo; Liu, Yang; Sun, Yan

doi:10.1016/j.jcis.2021.08.062

Cited by 35 publications

(21 citation statements)

References 69 publications

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“…The polar metal oxides can effectively chemisorb polysulfides to prevent the shuttle effect, such as MnO 2 , − MoO 3 , Al 2 O 3 , Fe 3 O 4 , etc. Among these polar metal oxides, MnO 2 could not only hinder the dissolution of long-chain polysulfides into electrolytes but also promote the deposition of short-chain polysulfides with nontoxicity . Lai et al synthesized a hollow carbon nanofiber@mesoporous δ-MnO 2 nanosheets (HCNF@pδ-MnO 2 ) and decorated them on the PP separator for Li–S batteries.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Separator with Ultra-Lightweight MnO₂ Coating for Highly Stable Lithium–Sulfur Batteries

Tian

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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The severe shuttling behavior in the discharging–charging process largely hampers the commercialization of lithium–sulfur (Li–S) batteries. Herein, we design a bifunctional separator with an ultra-lightweight MnO2 coating to establish strong chemical adsorption barriers for shuttling effect alleviation. The double-sided polar MnO2 layers not only trap the lithium polysulfides through extraordinary chemical bonding but also ensure the uniform Li+ flux on the lithium anode and inhibit the side reaction, resulting in homogeneous plating and stripping to avoid corrosion of the Li anode. Consequently, the assembled Li–S battery with the MnO2-modified separator retains a capacity of 665 mA h g–1 at 1 C after 1000 cycles at the areal sulfur loading of 2.5 mg cm–2, corresponding to only 0.028% capacity decay per cycle. Notably, the areal loading of ultra-lightweight MnO2 coating is as low as 0.007 mg cm–2, facilitating the achievement of a high energy density of Li–S batteries. This work reveals that the polar metal oxide-modified separator can effectively inhibit the shuttle effect and protect the Li anode for high-performance Li–S batteries.

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Section: Introductionmentioning

confidence: 99%

Bifunctional Separator with Ultra-Lightweight MnO₂ Coating for Highly Stable Lithium–Sulfur Batteries

Tian

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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“…In order to accomplish the same concept, commercial polypropylene separators are modified using diverse functional materials that can function as barriers to the polysulfides. − Carbon-based nanomaterials have gained much interest and are extensively employed as separator modifiers in lithium–sulfur batteries. , However, these materials can only offer physical interactions with the polysulfides leading to unsatisfactory results during long-term cycling . Hitherto, numerous polar materials, such as metal oxides, − sulfides, − nitrides, ,, carbides, , heteroatom-doped carbon, , conducting polymers, − metal–organic frameworks, , etc., were explored. These polar materials afford chemical interactions with polysulfides, blocking their movement toward the lithium anode, greatly enhancing the cyclability of lithium–sulfur batteries.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Restriction to Polysulfides by a Carbon Nanotube/Manganese Sulfide-Decorated Separator for Advanced Lithium–Sulfur Batteries

Kannan

Hareendrakrishnakumar

Joseph

et al. 2022

Energy Fuels

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Polysulfide dissolution and shuttling limit the capacity output and cycle life of lithium−sulfur batteries to a great extent. Separator modification using polar materials exploiting the ability to entrap polysulfides has been demonstrated as an effective approach to deal with the conundrum of polysulfide shuttling. Herein, a carbon nanotube/manganese sulfide nanocomposite is designed as a separator modifier in lithium−sulfur batteries for the first time. Furthermore, the carbon nanotube network provides a continuous network for rapid electronic conduction, imparts structural stability, and acts as a secondary barrier for polysulfides. Consequently, the cell displays an initial discharge capacity of 876 mAh g −1 at 0.5 C and sustains excellent stability with a retained capacity of 76% after 500 cycles. The self-discharge of the cell is also conspicuously reduced, maintaining a constant voltage for 100 h under open-circuit conditions. The electrochemical results represent an effective strategy to realize better performing Li−S batteries.

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“…[ 18–20 ] The commercial polyolefin separator with a low melting point and nonpolar characteristics results in poor electrolyte affinity and difficulty in modification. [ 21,22 ] In addition, most of the functionalization strategies have not paid attention to the thickness and weight, which would apparently reduce the energy density of LSBs.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Engineering of Binder‐Free Janus Separator with Ultra‐Thin Multifunctional Layer for Simultaneous Enhancement of Both Metallic Li Anode and Sulfur Cathode

Yao

Nie

et al. 2022

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and the undesired soluble LiPSs migrate through the porous commercial separators to the metallic Li anode, causing corrosion and passivation. [8] In terms of the metallic Li anode, the Li-dendrite growth triggered by the nonuniform Li dissolution/deposition will induce an internal short circuit. [9] To counteract these negative consequences, researchers have developed hosts for sulfur encapsulation in cathode, [10][11][12][13] lithium anode protection, [14] and separator modification to prevent lithium polysulfides (LiPSs) from shuttling. [15][16][17] Proposing a rational design strategy for simultaneous enhancement of both metallic Li anode and sulfur cathode is of great significance. The separator, one of the most indispensable components, contacts both the cathode and anode directly. It is considered to be a facile and effective approach to functionalizing separators to confine LiPSs and synchronously regulate the Li dissolution/deposition in LSBs. [18][19][20] The commercial polyolefin separator with a low melting point and nonpolar characteristics results in poor electrolyte affinity and difficulty in modification. [21,22] In addition, most of the functionalization strategies have not paid attention to the thickness and weight, which would apparently reduce the energy density of LSBs.What's worse, the stripping of the coated layer from the separator extensively exists in traditional separator modification methods, which would significantly diminish practical performance and even raise serious safety concerns about Li-metal batteries. [23,24] Especially for high energy-density batteries used in electric vehicles (Tesla, 4680), a large amount of binder (polyvinylidene fluoride; PVDF) would be coated on the separator to improve cycle stability, preventing the powder from falling off during cycling, but this is still ineffective. [25,26] Magnetron sputtering, an effective approach for fiber functionalization, could be a solution to the aforementioned issues. [27] During the sputtering process, the functional target material would deposit on the substrate in the form of atoms or molecules, enhancing the adhesion to overcome stripping defects.Meanwhile, research has demonstrated that electrospun nanofibrous separators with high porosity and polar groups were easily modified to improve the electrolyte affinity and suppress the shuttle effect of LiPSs. [28,29] Polyacrylonitrile (PAN) Exploring a scalable strategy to fabricate a multifunctional separator is of great significance to overcome the challenges of lithium polysulfides (LiPSs) and dendritic growth in lithium-sulfur batteries (LSBs). Herein, a binder-free Janus separator is constructed by interfacial engineering. At the cathode interface, an ultra-thin covalent triazine piperazine film containing tailorable micropores and adsorption sites is decorated on polyacrylonitrile (PAN) membrane by in situ interfacial polymerization, building a triple barrier for LiPSs. The combination of steric hindrance and chemical adsorption reduces LiPS's migration by 81.85%. Me...

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Novel functional separator with self-assembled MnO2 layer via a simple and fast method in lithium-sulfur battery

Cited by 35 publications

References 69 publications

Bifunctional Separator with Ultra-Lightweight MnO₂ Coating for Highly Stable Lithium–Sulfur Batteries

Bifunctional Separator with Ultra-Lightweight MnO₂ Coating for Highly Stable Lithium–Sulfur Batteries

Synergistic Restriction to Polysulfides by a Carbon Nanotube/Manganese Sulfide-Decorated Separator for Advanced Lithium–Sulfur Batteries

Interfacial Engineering of Binder‐Free Janus Separator with Ultra‐Thin Multifunctional Layer for Simultaneous Enhancement of Both Metallic Li Anode and Sulfur Cathode

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Novel functional separator with self-assembled MnO2 layer via a simple and fast method in lithium-sulfur battery

Cited by 35 publications

References 69 publications

Bifunctional Separator with Ultra-Lightweight MnO2 Coating for Highly Stable Lithium–Sulfur Batteries

Bifunctional Separator with Ultra-Lightweight MnO2 Coating for Highly Stable Lithium–Sulfur Batteries

Synergistic Restriction to Polysulfides by a Carbon Nanotube/Manganese Sulfide-Decorated Separator for Advanced Lithium–Sulfur Batteries

Interfacial Engineering of Binder‐Free Janus Separator with Ultra‐Thin Multifunctional Layer for Simultaneous Enhancement of Both Metallic Li Anode and Sulfur Cathode

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Bifunctional Separator with Ultra-Lightweight MnO₂ Coating for Highly Stable Lithium–Sulfur Batteries

Bifunctional Separator with Ultra-Lightweight MnO₂ Coating for Highly Stable Lithium–Sulfur Batteries