Function-directed design of battery separators based on microporous polyolefin membranes

Yang, Yanfei; Wang, Wankai; Meng, Guilin; Zhang, Junping

doi:10.1039/d2ta03511a

Cited by 58 publications

(32 citation statements)

References 390 publications

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“…For the PI/PP/PI-Super P separator, both sides are thoroughly wetted within 1.5 s (Figure S10), which confirms the ultrarapid electrolyte wetting capability, reflecting the better permeation effect of electrolyte to modified separator. The increased wettability of the separator for the electrolyte generally contributes to fast lithium-ions transport and tight contact between the electrolyte and the electrode. , To quantitatively evaluate the transport performance of lithium-ions through the separators, the physicochemical parameters such as ionic conductivity (σ) and lithium-ions transfer number ( t Li + ) of the electrolyte-soaked separators were characterized. As listed in Figure S11A,B and Table S2, the ionic conductivity is 1.72 mS/cm for PI/PP/PI-Super P separator, which is slightly higher than that of PP separator with 0.38 mS/cm.…”

Section: Resultsmentioning

confidence: 99%

Toward Safe and High-Performance Lithium–Sulfur Batteries via Polyimide Nanosheets-Modified Separator

Zhu

Zhang

Jin

et al. 2023

ACS Sustainable Chem. Eng.

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Lithium−sulfur batteries (LSBs) have broad application prospects in high density energy storage. Nevertheless, LSBs present serious safety concerns and rapid capacity decay due to the flammability and contractility of commercial separators at high temperatures and lithium polysulfide (LiPSs) dissolution. In view of this, a multifunctional modified separator is developed by combining a commercial polypropylene (PP) separator with a polyimide (PI)-Super P functional coating and a rigid nonflammable PI matrix. This PI/PP/PI-Super P separator provides multiple advantages: (i) strong physical blocking and chemical trapping/conversion ability for LiPSs, (ii) high flame-retardancy and dimensional stability, and (iii) superior electrolyte wettability and high efficiency lithium dendritic growth inhibition. As a result, the LSBs assembled with PI/PP/PI-Super P separators and pure sulfur cathodes exhibit an ultrahigh discharge specific capacity of 1611.8 mAh/g and excellent cycling performance (the average capacity attenuation within 100 cycles at 1 C is 0.469%) at 80 °C, which exceed the advanced results reported previously. More importantly, even when sulfur and organic electrolyte are adsorbed on PI/ PP/PI-Super P, the modified separator still shows good flame retardancy. Additionally, this modified separator is also suitable for LSBs with high sulfur loading. This work offers an innovative design concept for safe and high-performance LSBs.

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Section: Resultsmentioning

confidence: 99%

Toward Safe and High-Performance Lithium–Sulfur Batteries via Polyimide Nanosheets-Modified Separator

Zhu

Zhang

Jin

et al. 2023

ACS Sustainable Chem. Eng.

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“…Moreover, the permanent nanopores (12.294 Å, Figures S9 and S10) in the NCMP are smaller than the diameters of LiPS molecules, , which block LiPS by the molecular sieving effect (Figure S29). Typically, the sizes of LiPS in the electrolyte are significantly larger than 15 Å, for LiPS are in the form of (Li 2 S n ) m clusters . Additionally, the inherent π-conjugated structure in the NCMP can form a π-electron cloud with high electronegativity, which rejects the passage of electronegative LiPS anions via Coulombic interactions (Figure S30).…”

Section: Resultsmentioning

confidence: 99%

“…Second, in discharge–charge process, the Li + ions in the electrolyte are more likely to be adsorbed on the NCMP@PP separator because of the good affinity of Li + ions originating from their superior wettability and the noncovalent interaction between the π-electron cloud and Li + ions . Thus, isotropic distribution of Li + ions on the Li-metal anode surface/interface is achieved, which facilitates the formation of a stable solid electrolyte interphase (SEI) layer and a dendrite-free Li anode . Finally, the NCMP@PP separator can effectively reduce unwanted side reactions between the Li-metal anode and LiPS by inhibiting the LiPS shuttle (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…64 Thus, isotropic distribution of Li + ions on the Li-metal anode surface/interface is achieved, which facilitates the formation of a stable solid electrolyte interphase (SEI) layer and a dendrite-free Li anode. 62 Finally, the NCMP@PP separator can effectively reduce unwanted side reactions between the Li-metal anode and LiPS by inhibiting the LiPS shuttle (Figure 4). In contrast, the PP separator is incapable of forming a uniform Li + ion flux, leading to an unstable SEI layer, nonuniform Li dendrite nucleation, severe dead Li, and even short-circuit (Figure 5h).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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In Situ Separator Modification with an N-Rich Conjugated Microporous Polymer for the Effective Suppression of Polysulfide Shuttle and Li Dendrite Growth

Yang

et al. 2022

ACS Appl. Mater. Interfaces

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Lithium−sulfur (Li−S) batteries are very promising high-energy-density electrochemical energy storage devices, but suffer from serious Li polysulfide (LiPS) shuttle and uncontrollable Li dendrite growth. Here, we show in situ polyolefin separator modification with an N-rich conjugated microporous polymer (NCMP) for advanced Li−S battery. In situ polymerization generates an ultrathin NCMP coating on the whole external surface and the internal surface of the separator, which is substantially different from the conventional approaches with thick coatings only on the external surface. The NCMP coating with abundant N-containing groups (−NH 2 and −N�), uniform nanopores (12.294 Å), and π-conjugated structure can simultaneously inhibit LiPS shuttle and regulate uniform nucleation and growth of Li dendrites. Consequently, the NCMP-based separator endows the Li−S battery with significantly enhanced cycling stability at high S loading (5.4 mg cm −2 ), lean electrolyte (E/S = 6.3 μL mg −1 ), and limited Li excess (50 μm).

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“…LMBs use polyolefin separators such as polypropylene (PP) and polyethylene (PE) that are widely used in LIBs. Such separators have defects such as poor heat resistance, poor electrolyte wettability, low mechanical modulus, large and nonuniform pore size. , Most importantly, commercial polyolefin separators are nonionic conductors, and their pore structure cannot regulate the Li + flux, leading to a heterogeneous distribution of Li + above the electrodes, which seriously affects the safety of LMAs . Nanofibrous materials are attractive for modifying existing commercial separators or constructing untried separators due to their rich pore structure, excellent electrolyte wettability, good mechanical strength, and processability.…”

Section: Nanofibrous Materials For Separatorsmentioning

confidence: 99%

Advances in Nanofibrous Materials for Stable Lithium-Metal Anodes

Zhao

Yan

et al. 2022

ACS Nano

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Lithium metal is regarded as the most potential anode material for improving the energy density of batteries due to its high specific capacity and low electrode potential. However, the practical application of lithium-metal anodes (LMAs) still faces severe challenges such as uncontrollable dendrites growth and large volume expansion. The development of functional nanomaterials has brought opportunities for the revival of LMAs. Among them, nanofibrous materials show great application potential for LMAs protection due to their distinct functional and structural features. Here, the latest research progress in nanofibrous materials for LMAs is systematically outlined. First, the problems existing in the practical application of LMAs are analyzed. Then, prospective strategies and recent research progress toward stable LMAs based on nanofibrous materials are summarized from the aspects of artificial protective layers, three-dimensional frameworks, separators, and solid-state electrolytes. Finally, the future development of nanofibrous materials for the protection of lithium-metal batteries is summarized and prospected. This review establishes a close connection between nanofibrous materials and LMA modification and provides insight for the development of high-safety lithium-metal batteries.

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Function-directed design of battery separators based on microporous polyolefin membranes

Abstract: Separator has great influences on performance and safety of batteries, for both the separator properties and separator-electrode interfaces affect ionic diffusion. Microporous polyolefin membranes (MPM) with many excellent properties are...

Cited by 58 publications

References 390 publications

Toward Safe and High-Performance Lithium–Sulfur Batteries via Polyimide Nanosheets-Modified Separator

Toward Safe and High-Performance Lithium–Sulfur Batteries via Polyimide Nanosheets-Modified Separator

In Situ Separator Modification with an N-Rich Conjugated Microporous Polymer for the Effective Suppression of Polysulfide Shuttle and Li Dendrite Growth

Advances in Nanofibrous Materials for Stable Lithium-Metal Anodes

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