A novel three-dimensional boehmite nanowhiskers network-coated polyethylene separator for lithium-ion batteries

“…The better surface wettability increased the liquid absorption rate, and the abundant lithium-ion source provided by lithium salt facilitated the transfer of Li + between the separator and the electrode. [37] The cycling performance of LiFePO 4 /separator/Li at 0.2 C is presented in Figure 10b. The initial discharge specific capacities of PE, PE@SiO 2 , PE@L1SiO 2 , PE@L2SiO 2 , and PE@L4SiO 2 were 145, 147, 161, 162, and 165 mAh g −1 , respectively.…”

Section: Electrochemical Performancementioning

confidence: 99%

The Enhanced Performance of Polyethylene Composite Separators by the Modification of Lithium Salt@SiO₂ Nanoparticles

You

Duan

et al. 2021

Macro Materials & Eng

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Improving the dimensional thermal stability and electrochemical performance of polyethylene (PE) membrane is critical to enhance the safety performance of lithium-ion battery. In this paper, PE membranes are modified by lithium bis(trifuoromethanesulfonyl)imide (LiTFSI) solution and then coated with nano-SiO 2 /polyvinyl alcohol solution to obtain composite membranes (PE@LnSiO 2 , where n represents the concentration of LiTFSI solution). The obtained PE@L4SiO 2 (LiTFSI solution concentration is 4%) composite membrane possesses a thermal shrinkage rate of only 17% at 150°C, which is far superior to that of the PE separator. The ionic conductivity of the composite membrane is 16.9 × 10 −4 S cm −1 at room temperature (RT), and the battery impedance decreases to 154 , which is remarkably better than that of the PE membrane (188 ). The battery delivers a reversible discharge capacity of 164 mAh g −1 at 0.2 C under RT after 250 cycles, and the coulomb efficiency remains above 99%. The battery also has a high discharge capacity of 132 mAh g −1 at 2 C, which indicates that it has excellent rate performance. Therefore, this research successfully explores a simple method to effectively improve the dimensional thermal stability of PE separator, as well as the electrochemical and safety performance of lithium battery.

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“…Over the past few decades, the demand for high-energy batteries has rapidly expanded from small consumer information technology (IT) electronics to large-scale electronic systems such as electric vehicles (EVs) and energy storage systems (ESSs). These demands have prompted intensive research and development of Li secondary batteries with environmentally friendly properties, high energy density, long lifespan, and low self-discharge properties compared to other competitive secondary battery systems such as Ni-Cd batteries and Ni-MH batteries [1][2][3]. As the performance of Li secondary batteries has significantly improved, the roles of the active materials (cathode and anode materials) and electrolytes are considered to be very important.…”

Section: Introductionmentioning

confidence: 99%

Upgrading the Properties of Ceramic-Coated Separators for Lithium Secondary Batteries by Changing the Mixing Order of the Water-Based Ceramic Slurry Components

et al. 2022

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Developing uniform ceramic-coated separators in high-energy Li secondary batteries has been a challenging task because aqueous ceramic coating slurries have poor dispersion stability and coating quality on the hydrophobic surfaces of polyolefin separators. In this study, we develop a simple but effective strategy for improving the dispersion stability of aqueous ceramic coating slurries by changing the mixing order of the ceramic slurry components. The aqueous ceramic coating slurry comprises ceramics (Al2O3), polymeric binders (sodium carboxymethyl cellulose, CMC), surfactants (disodium laureth sulfosuccinate, DLSS), and water. The interaction between the ceramic slurry components is studied by changing the mixing order of the ceramic slurry components and quantitatively evaluating the dispersion stability of the ceramic coating slurry using a Lumisizer. In the optimized mixing sequence, Al2O3 and DLSS premixed in aqueous Al2O3-DLSS micelles through strong surface interactions, and they repel each other due to steric repulsion. The addition of CMC in this state does not compromise the dispersion stability of aqueous ceramic coating slurries and enables uniform ceramic coating on polyethylene (PE) separators. The prepared Al2O3 ceramic-coated separators (Al2O3–CCSs) exhibit improved physical properties, such as high wettability electrolyte uptake and ionic conductivity, compared to the bare PE separators. Furthermore, Al2O3–CCSs exhibit improved electrochemical performance, such as rate capability and cycling performance. The half cells (LiMn2O4/Li metal) comprising Al2O3–CCSs retain 90.4% (88.4 mAh g−1) of initial discharge capacity after 150 cycles, while 27.6% (26.4 mAh g−1) for bare PE. Furthermore, the full cells (LiMn2O4/graphite) consisting of Al2O3–CCSs exhibit 69.8% (72.2 mAh g−1) of the initial discharge capacity and 24.9% (25.0 mAh g−1) for bare PE after 1150 cycles.

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A novel three-dimensional boehmite nanowhiskers network-coated polyethylene separator for lithium-ion batteries

Cited by 33 publications

References 39 publications

Multiple boosting Janus membranes synergized with Li-rich PAF-6 and carbon nanoparticles for high performance lithium–sulfur batteries

Multiple boosting Janus membranes synergized with Li-rich PAF-6 and carbon nanoparticles for high performance lithium–sulfur batteries

The Enhanced Performance of Polyethylene Composite Separators by the Modification of Lithium Salt@SiO₂ Nanoparticles

Upgrading the Properties of Ceramic-Coated Separators for Lithium Secondary Batteries by Changing the Mixing Order of the Water-Based Ceramic Slurry Components

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A novel three-dimensional boehmite nanowhiskers network-coated polyethylene separator for lithium-ion batteries

Cited by 33 publications

References 39 publications

Multiple boosting Janus membranes synergized with Li-rich PAF-6 and carbon nanoparticles for high performance lithium–sulfur batteries

Multiple boosting Janus membranes synergized with Li-rich PAF-6 and carbon nanoparticles for high performance lithium–sulfur batteries

The Enhanced Performance of Polyethylene Composite Separators by the Modification of Lithium Salt@SiO2 Nanoparticles

Upgrading the Properties of Ceramic-Coated Separators for Lithium Secondary Batteries by Changing the Mixing Order of the Water-Based Ceramic Slurry Components

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The Enhanced Performance of Polyethylene Composite Separators by the Modification of Lithium Salt@SiO₂ Nanoparticles