Separator impregnated with polyvinyl alcohol to simultaneously improve electrochemical performances and compression resistance

Ding, Lei; Yan, Ning; Zhang, Sihang; Xu, Ruizhang; Wu, Tong; Yang, Feng; Cao, Ya; Xiang, Ming

doi:10.1016/j.electacta.2021.139568

Cited by 18 publications

(10 citation statements)

References 54 publications

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“…PP separator battery has a voltage platform at 3.36 V at 0.2 C. As the current density increases, the voltage platform will decrease to 3.09 V. However, PP‐TD2 the separator battery, the discharge voltage drops from 3.38 to 3.34 V. From 0.2 to 2 C, the discharge voltage plateau of the PP‐TD2 separator battery remains almost unchanged. The voltage platform of PP‐TD2 separator varies much less under different current density, and its discharge process is more stable 33,46 . The results show that the electrochemical polarization of the battery is reduced by the modified separator under high current density and the increased σ and t + of the PP‐TD2 separator can achieve rapid transmission of Li + .…”

Section: Resultsmentioning

confidence: 92%

“…The voltage platform of PP-TD2 separator varies much less under different current density, and its discharge process is more stable. 33,46 The results show that the electrochemical polarization of the battery is reduced by the modified separator under high current density and the increased σ and t + of the PP-TD2 separator can achieve rapid transmission of Li + .…”

Section: Electrochemical Performance Of Pp and Pp-td Separatorsmentioning

confidence: 95%

“…29 As a suitable substitute, organic coatings were applied on the surface of polyolefin microporous films. Organic coatings such as polydopamine (PDA), 30 polyvinylidene fluoride (PVDF), 31 cellulose diacetate (CDA), 32 polyvinyl alcohol (PVA), 33 aramid nanofiber (ANF), 34 poly(methyl methacrylate) (PMMA), 35 polyimide (PI), 36 and poly(pphenylene terephthalamide) (PPTA) 37 are applied to polyolefin separators. The reason for organic coatings to be applied to the surface of polyolefins is because there are a large number of polar groups in the organic coatings, which have affinity for the electrolyte, thereby enhancing the absorption and retention capacity of polyolefin separator for the electrolyte and improving battery performance.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical self‐assembly of tannic acid/diethylenetriamine on polypropylene for high‐performance separator

Wang,

Han,

Liu

et al. 2024

J of Applied Polymer Sci

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In lithium‐ion batteries (LIBs), separator is used to provide a barrier between the anode and cathode and provide freedom for the transport of lithium‐ions, which serves a key function in inhibiting internal short circuit and improving the battery safety. The limited wettability of commercial polyolefin separators in electrolytes restricts its utilization in extreme environmental conditions. In our work, we choose polypropylene (PP) as the precursor and can address the issue of poor wettability through suitable modification methods. Tannic acid (TA) and diethylenetriamine (DETA) were utilized to coat PP separator via hierarchical self‐assembly approach, and the coating is further stabilized by taking advantage of the specific oxidizing properties of sodium periodate. This method scarcely increases the separator thickness or sacrifices the microporous structure of the original separator. The improved separator not only exhibits outstanding wetting capability and relatively high ion conductivity (1.24 mS cm−1), but also has the highest lithium‐ion migration number of 0.74. This indicates that when the modified separator is applied to LIBs, its electrochemical performance is significantly enhanced. The enhancement in electrochemical performance of LIBs is attributed to the strong absorption and retention ability of the coating on the separator. The reversible capacity of Li/PP‐TD2 separator/LiFePO4 battery is 144.3 mAh g−1 at 2C, which is higher than that of PP separator (117.1 mAh g−1) under the same current density. Even after 200 cycles, the PP‐TD2 separator with two‐layer assembly modification still maintains a higher coulombic efficiency of 97.55% and a discharge capacity of 96.6%. This hierarchical self‐assembly modification of PP provides an effective approach for fabricating high‐performance separator.

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Section: Resultsmentioning

confidence: 92%

Section: Electrochemical Performance Of Pp and Pp-td Separatorsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hierarchical self‐assembly of tannic acid/diethylenetriamine on polypropylene for high‐performance separator

Wang,

Han,

Liu

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Among the essential components of a LIB, the separator serves as a physical barrier between the cathode and anode to prevent internal short circuits, while providing tunnels for lithium-ion migrations during the charge–discharge cycling process with the aid of a liquid electrolyte. − In this regard, enough thermal resistance, high mechanical strength, moderate porosity, good electrolyte affinity, and electrochemical stability are essential to a LIB separator. To date, commercially available separator materials are mainly polyolefins such as polyethylene (PE) and polypropylene (PP). − However, these products still suffer from several intrinsic defects that heavily hinder their applications in next-generation high-performance battery systems. For instance, the insufficient porosity of commercial polyolefin separators and the inferior compatibility between nonpolar polyolefins and polar liquid electrolytes would enhance the internal resistance, decrease the ionic conductivity, and deteriorate the overall performance of the batteries. − More importantly, the poor thermal stability of polyolefins would cause shrinkage of the separator at an elevated temperature owing to misuse, external impact, or being operated under other harsh conditions, leading to severe short circuit, combustion, and subsequent explosion of the battery. − …”

Section: Introductionmentioning

confidence: 99%

Grafting Polyethyleneimine–Poly(ethylene glycol) Gel onto a Heat-Resistant Polyimide Nanofiber Separator for Improving Lithium-Ion Transporting Ability in Lithium-Ion Batteries

Huang

Zhou

Qian

et al. 2023

ACS Appl. Mater. Interfaces

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To improve the lithium-ion transporting ability in lithium-ion batteries, a high-performance polyimide-based lithium-ion battery separator (PI-mod) was prepared by chemically grafting poly(ethylene glycol) (PEG) onto the surface of a heat-resistant polyimide nanofiber matrix with the assistance of amino-rich polyethyleneimine (PEI). The resulted PEI–PEG polymer coating exhibited unique gel-like properties with an electrolyte uptake rate of 168%, an area resistance as low as 2.60 Ω·cm2, and an ionic conductivity up to 2.33 mS·cm–1, which are 3.5, 0.10, and 12.3 times that of the commercial separator Celgard 2320, respectively. Meanwhile, the heat-resistant polyimide skeleton can effectively avoid thermal shrinkage of the modified separator even after 200 °C treatment for 0.5 h, which ensures the safety of the battery working under extreme conditions. The modified PI separator possessed a high electrochemical stability window of 4.5 V. Compared with the batteries from the commercial separator Celgard 2320 and the pure polyimide matrix, the assembled coin cell with the PI-mod separator showed much better rate capabilities and capacity retention due to the high electrolyte affinity of the PEI-PEG polymer coating. The developed strategy of using the electrolyte-swollen polymer to modify the thermal-resistant separator network provides an efficient way for establishing high-power lithium-ion batteries with good safety performance.

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“…Polyvinyl alcohol (PVA) is a water-soluble polyhydroxy polymer that can be physically or chemically cross-linked to form the hydrogel as a matrix material for tissue repair and regeneration [ 22 , 23 , 24 ]. PVA hydrogels have a large number of microporous structures, as well as excellent elastic and compressive properties [ 25 ]. Furthermore, PVA has an osmotic equilibrium with the surrounding joint soft tissue.…”

Section: Introductionmentioning

confidence: 99%

Construction and Evaluation of Alginate Dialdehyde Grafted RGD Derivatives/Polyvinyl Alcohol/Cellulose Nanocrystals IPN Composite Hydrogels

Wang,

Yin,

Chen

et al. 2023

Molecules

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To enhance the mechanical strength and cell adhesion of alginate hydrogel, making it satisfy the requirements of an ideal tissue engineering scaffold, the grafting of Arg-Gly-Asp (RGD) polypeptide sequence onto the alginate molecular chain was conducted by oxidation of sodium periodate and subsequent reduction amination of 2-methylpyridine borane complex (2-PBC) to synthesize alginate dialdehyde grafted RGD derivatives (ADA-RGD) with good cellular affinity. The interpenetrating network (IPN) composite hydrogels of alginate/polyvinyl alcohol/cellulose nanocrystals (ALG/PVA/CNCs) were fabricated through a physical mixture of ion cross-linking of sodium alginate (SA) with hydroxyapatite/D-glucono-δ-lactone (HAP/GDL), and physical cross-linking of polyvinyl alcohol (PVA) by a freezing/thawing method, using cellulose nanocrystals (CNCs) as the reinforcement agent. The effects of the addition of CNCs and different contents of PVA on the morphology, thermal stability, mechanical properties, swelling, biodegradability, and cell compatibility of the IPN composite hydrogels were investigated, and the effect of RGD grafting on the biological properties of the IPN composite hydrogels was also studied. The resultant IPN ALG/PVA/CNCs composite hydrogels exhibited good pore structure and regular 3D morphology, whose pore size and porosity could be regulated by adjusting PVA content and the addition of CNCs. By increasing the PVA content, the number of physical cross-linking points in PVA increased, resulting in greater stress support for the IPN composite hydrogels of ALG/PVA/CNCs and consequently improving their mechanical characteristics. The creation of the IPN ALG/PVA/CNCs composite hydrogels’ physical cross-linking network through intramolecular or intermolecular hydrogen bonding led to improved thermal resistance and reduced swelling and biodegradation rate. Conversely, the ADA-RGD/PVA/CNCs IPN composite hydrogels exhibited a quicker degradation rate, attributed to the elimination of ADA-RGD by alkali. The results of the in vitro cytocompatibility showed that ALG/0.5PVA/0.3%CNCs and ADA-RGD/PVA/0.3%CNCs composite hydrogels showed better proliferative activity in comparison with other composite hydrogels, while ALG/PVA/0.3%CNCs and ADA-RGD/PVA/0.3%CNCs composite hydrogels displayed obvious proliferation effects, indicating that PVA, CNCs, and ADA-RGD with good biocompatibility were conducive to cell proliferation and differentiation for the IPN composite hydrogels.

show abstract

Separator impregnated with polyvinyl alcohol to simultaneously improve electrochemical performances and compression resistance

Cited by 18 publications

References 54 publications

Hierarchical self‐assembly of tannic acid/diethylenetriamine on polypropylene for high‐performance separator

Hierarchical self‐assembly of tannic acid/diethylenetriamine on polypropylene for high‐performance separator

Grafting Polyethyleneimine–Poly(ethylene glycol) Gel onto a Heat-Resistant Polyimide Nanofiber Separator for Improving Lithium-Ion Transporting Ability in Lithium-Ion Batteries

Construction and Evaluation of Alginate Dialdehyde Grafted RGD Derivatives/Polyvinyl Alcohol/Cellulose Nanocrystals IPN Composite Hydrogels

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