Effect of porosity on PVdF-co-HFP–PMMA-based electrolyte

Sundaram, N.; Musthafa, O. T. Muhammed; Sannegowda, Lokesh Koodlur; Angaiah, Subramania

doi:10.1016/j.matchemphys.2007.12.024

Cited by 17 publications

(5 citation statements)

References 23 publications

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“…Plenty of works have demonstrated that GPEs have higher acceptable ionic conductivity than solid electrolytes at ambient temperature and higher thermal and mechanical stability than liquid electrolytes. A series of polymer hosts, such as poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO), poly(acrylonitrile) (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVdF), poly(vinylidene fluoride- co -hexafluoro propylene)(PVdF- co -HFP), and poly(vinylpyrrolidone) (PVP) have been developed for many years. Though considered to have a relatively better surface contact due to the flexibility of the polymer, few of them are compatible with high-voltage cathodes caused by a limited voltage window.…”

Section: Electrolyte Additivesmentioning

confidence: 99%

Realizing High Voltage Lithium Cobalt Oxide in Lithium-Ion Batteries

Wang

Lü

2019

Ind. Eng. Chem. Res.

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The combination of high voltage cathode and metal or graphite anodes provides a feasible way for future high-energy batteries. Among various battery cathodes, lithium cobalt oxide is outstanding for its excellent cycling performance, high specific capacity, and high working voltage and has achieved great success in the field of consumer electronics in the past decades. Recently, demands for smarter, lighter, and longer standby-time electronic devices have pushed lithium cobalt oxide-based batteries to their limits. To obtain high voltage batteries, various methods have been adopted to lift the cutoff voltage of the batteries above 4.45 V (vs Li/Li+). This review summarizes the mechanism of capacity decay of lithium cobalt oxide during cycling. Various modifications to achieve high voltage lithium cobalt oxide, including coating and doping, are also presented. We also extend the discussion of popular modification methods for electrolytes including electrolyte additives, quasi-solid electrolytes, and electrode/electrolyte interfaces.

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Section: Electrolyte Additivesmentioning

confidence: 99%

Realizing High Voltage Lithium Cobalt Oxide in Lithium-Ion Batteries

Wang

Lü

2019

Ind. Eng. Chem. Res.

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“…The as-fabricated MPPBM was found to have better ionic conductivity than MPPBM created using the conventional blending method. The added advantages of the prepared membrane included higher ionic conductivity, good adhesion to an electrode, and good thermal stability at high temperatures [ 28 ]. Building on this work, Xiao et al developed a novel “sandwiched” membrane for use in LIBs comprising a PMMA film sandwiched between two layers of electrospun PVDF-HFP fibrous films.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stable PVDF-HFP-Based Gel Polymer Electrolytes for High-Performance Lithium-Ion Batteries

et al. 2022

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The development of gel polymer electrolytes (GPEs) for lithium-ion batteries (LIBs) has paved the way to powering futuristic technological applications such as hybrid electric vehicles and portable electronic devices. Despite their multiple advantages, non-aqueous liquid electrolytes (LEs) possess certain drawbacks, such as plasticizers with flammable ethers and esters, electrochemical instability, and fluctuations in the active voltage scale, which limit the safety and working span of the batteries. However, these shortcomings can be rectified using GPEs, which result in the enhancement of functional properties such as thermal, chemical, and mechanical stability; electrolyte uptake; and ionic conductivity. Thus, we report on PVDF-HFP/PMMA/PVAc-based GPEs comprising poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) and poly(methyl methacrylate) (PMMA) host polymers and poly(vinyl acetate) (PVAc) as a guest polymer. A physicochemical characterization of the polymer membrane with GPE was conducted, and the electrochemical performance of the NCM811/Li half-cell with GPE was evaluated. The GPE exhibited an ionic conductivity of 4.24 × 10−4 S cm−1, and the NCM811/Li half-cell with GPE delivered an initial specific discharge capacity of 204 mAh g−1 at a current rate of 0.1 C. The cells exhibited excellent cyclic performance with 88% capacity retention after 50 cycles. Thus, this study presents a promising strategy for maintaining capacity retention, safety, and stable cyclic performance in rechargeable LIBs.

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“…12,13 Furthermore, the fibrous membrane exhibits excellent wettability to liquid electrolyte because of the extensive choice of high polar polymers, which greatly improves the electrochemical property of lithium-ion battery. To date, a large number of polymers including polyvinyli-denefluoride (PVDF), 14,15 polyacrylonitrile (PAN), 16 poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), 17 –19 poly (methyl methacrylate) (PMMA), 20 polyvinyl acetate (PVA), 21 polyvinyl chloride (PVC), 22 polyethylene terephthalate (PET), 23 polyimide (PI), 24,25 nylon 6,6, 26 and cellulose 27,28 have been fabricated as lithium-ion battery separators using the electrospinning technique. Generally, the separator needs to be mechanically strong, so that it could withstand the tensile stress in the process of the winding operation during battery assembly.…”

Section: Introductionmentioning

confidence: 99%

A high-strength PPESK/PVDF fibrous membrane prepared by coaxial electrospinning for lithium-ion battery separator

Gong

Wang

et al. 2018

High Performance Polymers

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Electrospinning fibrous membranes have attracted a great deal of attention because of their advantages, including uniform pore size, large ratio surface area, and high porosity. For extended application in lithium-ion battery, it is essential to further improve their electrochemical, mechanical, and thermal properties. In this work, a new poly (phthalazine ether sulfone ketone) (PPESK)/polyvinyli-denefluoride (PVDF) core/shell fibrous membrane was fabricated via the coaxial electrospinning technique, followed by hot press. The PPESK/PVDF membrane hot pressed at 160°C exhibits excellent comprehensive performance, including large porosity (80%), high electrolyte uptake (805%), and excellent thermal stability (at 200°C). Moreover, due to the improved bonding effect derived from the solidification of the PVDF shell layer after the hot press, the mechanical property of the membrane is effectively enhanced. The electrochemical tests also indicate that the PPESK/PVDF membrane shows larger ionic conductivity and lower interfacial resistance when compared with commercial microporous polypropylene separator. In addition, simulated cells assembled with the PPESK/PVDF membrane present superior discharge capacity, stable cycle performance, and excellent rate capability. Therefore, the hot-pressed coaxial PPESK/PVDF fibrous membrane has the potential to be a promising candidate as the separator for high-performance lithium-ion battery.

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Effect of porosity on PVdF-co-HFP–PMMA-based electrolyte

Cited by 17 publications

References 23 publications

Realizing High Voltage Lithium Cobalt Oxide in Lithium-Ion Batteries

Realizing High Voltage Lithium Cobalt Oxide in Lithium-Ion Batteries

Thermally Stable PVDF-HFP-Based Gel Polymer Electrolytes for High-Performance Lithium-Ion Batteries

A high-strength PPESK/PVDF fibrous membrane prepared by coaxial electrospinning for lithium-ion battery separator

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