Bifunctional LiI additive for poly(ethylene oxide) electrolyte with high ionic conductivity and stable interfacial chemistry

Wang, Haonan; Hou, Tianyi; Cheng, Hang; Jiang, Bowen; Xu, Henghui; Huang, Yunhui

doi:10.1016/j.jechem.2022.02.041

Cited by 44 publications

(23 citation statements)

References 57 publications

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“…Generally, the electrolyte wetting for thick electrodes takes a longer time. Here, in situ ultrasonic transmission mapping technology developed by our group − was applied to investigate the electrolyte wetting rate of different thick electrodes. Figure shows the time-dependent ultrasonic images of thick LFP-based pouch cells after electrolyte injection.…”

Section: Results and Discussionmentioning

confidence: 99%

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO₄ Cathodes with Low Tortuosity

Wang

Miao

et al. 2023

ACS Appl. Mater. Interfaces

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Thickening electrodes are expected to increase the energy density of batteries. Unfortunately, the manufacturing issues, sluggish electrolyte infiltration, and restrictions on electron/ion transport seriously hamper the development of thick electrodes. In this work, an ultrathick LiFePO 4 (LFP) electrode with hierarchically vertical microchannels and porous structures (I-LFP) is rationally designed by combining the template method and the mechanical channel-making method. By using ultrasonic transmission mapping technology, it is proven that the open and vertical microchannels and interconnected pores can successfully overcome the electrolyte infiltration difficulty of conventional thick electrodes. Meanwhile, both the electrochemical and simulation characterizations reveal the fast ion transport kinetics and low tortuosity (1.44) in the I-LFP electrode. As a result, the I-LFP electrode delivers marked improvements in rate performance and cycling stability even under a high areal loading of 180 mg cm −2 . Moreover, according to the results of operando optical fiber sensors, the stress accumulation in the I-LFP electrode is effectively alleviated, which further confirms the improvement of mechanical stability.

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Section: Results and Discussionmentioning

confidence: 99%

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO₄ Cathodes with Low Tortuosity

Wang

Miao

et al. 2023

ACS Appl. Mater. Interfaces

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“…The chemical characteristics of gelatin, GTA, Gel-g-GTA, FW, PG-SINH, and PGW-SINCH were examined by Fourier transform infrared spectroscopy (FTIR, Spectrum One FTIR spectrophotometer). The ionic conductivities (σ, S cm –1 ) of PGW-SINCH electrolytes were characterized by an electrochemical workstation (CHI660E) and calculated from the following eq : σ = L R b × S where L (cm) represents the thickness of the electrolyte, R b (Ω) is the bulk resistance of the electrolyte, and S (cm 2 ) is the effective interface area between the electrolyte and stainless-steel electrode. The swelling ratios ( TSR represents thickness swelling ratio and VSR is the volume swelling ratio) of PG-SINH and PGW-SINCH were calculated according to the following eqs and : T S R = T 1 − T 0 T 0 × 100 % V S R = V 1 − V 0 V 0 × 100 % where T 0 (cm) and V 0 (cm 3 ) are the thickness and volume of PG-SINH and PGW-SINCH before immersing in 1 M Li 2 SO 4 ; T 1 (cm) and V 1 (cm 3 ) are the thickness and volume of PG-SINH and PGW-SINCH after immersing in 1 M Li 2 SO 4 .…”

Section: Experimental Sectionmentioning

confidence: 99%

“…T h i s c o n t e n t i s o n l y l i c e n s e d f o r c o n s u m p t i o n b y A u t h o r i z e d U s e r s a f f i l i a t e i n d i v i d u a l n o t d i r e c t l y a s s o c i a t e d w i t h s c i t e i s p r o h i b i t e d .electrochemical workstation (CHI660E) and calculated from the following eq 1:25 …”

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confidence: 99%

Flexible Wood Enhanced Poly(acrylic acid-co-acrylamide)/Quaternized Gelatin Hydrogel Electrolytes for High-Energy-Density Supercapacitors

Gao

Wei

et al. 2023

ACS Appl. Mater. Interfaces

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Hydrogels with good flexibility and strong hydrophilicity can be candidates for excellent flexible electrolyte materials. However, the poor structural stability, uncontrollable swelling, and lower potential window of hydrogel electrolytes need to be improved. This work combined quaternized gelatin with cross-linked poly(acrylic acid-co-acrylamide) to form a semiinterpenetrating network and gelatinized in situ in a flexible porous wood skeleton. The flexible wood (FW) skeleton enhances the hydrogel and limits the swelling of the hydrogel. In addition, quaternary ammonium groups and FW act synergistically to provide the composite hydrogel electrolyte with a high ionic conductivity of 5.57 × 10 −2 S cm −1 . The composite hydrogel electrolyte can enable the flexible supercapacitor to operate safely in a potential window of 0−2 V. The optimized supercapacitor has a high specific capacitance of 286.74 F g −1 and provides an outstanding energy density of 39.09 W h kg −1 . The flexible supercapacitor shows a capacitance retention of up to 94.6% after 10,000 charge−discharge cycles, indicating dramatic cycling stability. Simultaneously, a capacitance retention of nearly 90% can be maintained by the flexible supercapacitor after 180°bends for 1000 times. A viable idea for developing high-performance hydrogel electrolytes and flexible supercapacitors is provided in this research.

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“…Nevertheless, its poor mechanical properties make it difficult to restrain the growth of lithium dendrites, and the low ionic conductivity limits its application in solid-state batteries. , For improving the mechanical properties and ionic conductivity of SPEs, introducing nanofillers with ionic conductivity into SPEs is considered to be the direct and effective way. − Toward the inorganic nanofillers, the incorporation of inorganic nanofillers with SPEs could well improve the ionic conductivity. However, the interfacial interaction between inorganic nanofillers and the SPE matrix is relatively poor, resulting in the agglomeration of nanofillers in the SPE matrix and a low dissociation degree of lithium salts, which seriously affect the electrochemical performance of SPEs. − Accordingly, researchers have turned their attention to polymer nanofillers, using their abundant functional groups to generate strong interactions with the SPE matrix so that the compatibility of nanofillers with the SPE matrix can be improved. Ma et al introduced the electrospun polyacrylonitrile (PAN) skeleton into the PEO matrix as the SPE for the lithium–metal battery.…”

Section: Introductionmentioning

confidence: 99%

Reactive Aramid Nanofiber-Reinforced Polyvinyl-Alcohol-Based Solid Polymer Electrolyte for High-Performance Li Metal Batteries

Zheng

Tao

Guo

et al. 2023

ACS Appl. Energy Mater.

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Solid polymer electrolytes (SPEs) with high ionic conductivity and strong mechanical properties are preconditions for the stable cycling of high-performance Li metal batteries. However, single-polymer SPEs often have low ionic conductivity, which greatly limits their further application. Herein, a SPE composed of polyvinyl alcohol (PVA), reactive aramid nanofibers (RANFs), and lithium bistrifluoromethanesulfonimide (LiTFSI) is prepared using a simple solution-casting method. After introducing the RANFs, the SPE of RANFs/PVA-containing LiTFSI not only exhibits high mechanical properties but also has good thermal stability. The RANFs/PVA SPE constructed from the strong hydrogen bond interaction between rigid RANFs and flexible PVA shows high migration efficiency of lithium ions. When the loading amount of RANFs is 2 wt %, the ionic conductivity of RANFs/PVA reaches ∼7.7 × 10 –4 S·cm–1, and the lithium-ion migration number is ∼0.54 at 60 °C. Toward the Li|RANFs/PVA-2 wt %|LiFePO4 full cell, the discharge specific capacity could reach 162.5 mA h·g–1 at 60 °C and 0.1 C. Meanwhile, the Li|RANFs/PVA-2 wt %|LiFePO4 battery also shows outstanding long-term cycling performance and could maintain 81% of the initial capacity after 1200 cycles at 1 C. The solid-state Li|RANFs/PVA|LiFePO4 cell also exhibits excellent resilience in destructive tests such as cell bending, piercing, and cutting.

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Bifunctional LiI additive for poly(ethylene oxide) electrolyte with high ionic conductivity and stable interfacial chemistry

Cited by 44 publications

References 57 publications

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO₄ Cathodes with Low Tortuosity

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO₄ Cathodes with Low Tortuosity

Flexible Wood Enhanced Poly(acrylic acid-co-acrylamide)/Quaternized Gelatin Hydrogel Electrolytes for High-Energy-Density Supercapacitors

Reactive Aramid Nanofiber-Reinforced Polyvinyl-Alcohol-Based Solid Polymer Electrolyte for High-Performance Li Metal Batteries

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Bifunctional LiI additive for poly(ethylene oxide) electrolyte with high ionic conductivity and stable interfacial chemistry

Cited by 44 publications

References 57 publications

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO4 Cathodes with Low Tortuosity

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO4 Cathodes with Low Tortuosity

Flexible Wood Enhanced Poly(acrylic acid-co-acrylamide)/Quaternized Gelatin Hydrogel Electrolytes for High-Energy-Density Supercapacitors

Reactive Aramid Nanofiber-Reinforced Polyvinyl-Alcohol-Based Solid Polymer Electrolyte for High-Performance Li Metal Batteries

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Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO₄ Cathodes with Low Tortuosity

Hierarchical Electrode Architecture Enabling Ultrahigh-Capacity LiFePO₄ Cathodes with Low Tortuosity