Excellent rate capability and cycle life of Li metal batteries with ZrO2/POSS multilayer-assembled PE separators

Chi, Mingming; Shi, Liyi; Wang, Zhuyi; Zhu, Jiefang; Mao, Xufeng; Zhao, Yin; Zhang, Meihong; Sun, Lining

doi:10.1016/j.nanoen.2016.07.037

Cited by 128 publications

(64 citation statements)

References 31 publications

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“…Coating is one of the most useful techniques to modulate the properties of commercial separators. Relevant materials, such as mussel‐inspired polydopamine, boron‐nitride (BN) nanosheets, ultrathin nitrogen/sulfur co‐doped graphene nanosheets (NSG), ZrO 2 /POSS multilayer, Al 2 O 3 /poly(phenyl‐ co ‐methacryloxypropyl)silsesquioxane composites, etc., have been adopted with different functions. Specifically, the polydopamine coating increases the wettability between the PE separators and electrolytes, and thus enables a well‐distributed lithium‐ion flux over the whole lithium surface.…”

Section: Strategies To Revive Lithium‐metal Anode In Loesmentioning

confidence: 99%

Reviving Lithium‐Metal Anodes for Next‐Generation High‐Energy Batteries

2017

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Lithium-metal batteries (LMBs), as one of the most promising next-generation high-energy-density storage devices, are able to meet the rigid demands of new industries. However, the direct utilization of metallic lithium can induce harsh safety issues, inferior rate and cycle performance, or anode pulverization inside the cells. These drawbacks severely hinder the commercialization of LMBs. Here, an up-to-date review of the behavior of lithium ions upon deposition/dissolution, and the failure mechanisms of lithium-metal anodes is presented. It has been shown that the primary causes consist of the growth of lithium dendrites due to large polarization and a strong electric field at the vicinity of the anode, the hyperactivity of metallic lithium, and hostless infinite volume changes upon cycling. The recent advances in liquid organic electrolyte (LOE) systems through modulating the local current density, anion depletion, lithium flux, the anode-electrolyte interface, or the mechanical strength of the interlayers are highlighted. Concrete strategies including tailoring the anode structures, optimizing the electrolytes, building artificial anode-electrolyte interfaces, and functionalizing the protective interlayers are summarized in detail. Furthermore, the challenges remaining in LOE systems are outlined, and the future perspectives of introducing solid-state electrolytes to radically address safety issues are presented.

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Section: Strategies To Revive Lithium‐metal Anode In Loesmentioning

confidence: 99%

Reviving Lithium‐Metal Anodes for Next‐Generation High‐Energy Batteries

2017

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“…To address the problems associated with Li metal anodes, researchers have investigated various approaches, including artificial SEI layers on the Li metal electrodes, optimized electrolyte compositions, modified current collectors, 3D composite Li anodes, and guiding matrixes on Li anodes . While most of the strategies, aiming at stabilizing the SEI layer and/or decreasing the effective current density on the Li metal, were focused on the Li metal and electrolytes, little effort has so far been made to circumvent the problems by modifying the separator . This is somewhat surprising given that the separator is one of the indispensable components in batteries .…”

Section: Introductionmentioning

confidence: 99%

Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries

Pan

Sun

et al. 2018

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Poor cycling stability and safety concerns regarding lithium (Li) metal anodes are two major issues preventing the commercialization of high-energy density Li metal-based batteries. Herein, a novel tri-layer separator design that significantly enhances the cycling stability and safety of Li metal-based batteries is presented. A thin, thermally stable, flexible, and hydrophilic cellulose nanofiber layer, produced using a straightforward paper-making process, is directly laminated on each side of a plasma-treated polyethylene (PE) separator. The 2.5 µm thick, mesoporous (≈20 nm average pore size) cellulose nanofiber layer stabilizes the Li metal anodes by generating a uniform Li flux toward the electrode through its homogenous nanochannels, leading to improved cycling stability. As the tri-layer separator maintains its dimensional stability even at 200 °C when the internal PE layer is melted and blocks the ion transport through the separator, the separator also provides an effective thermal shutdown function. The present nanocellulose-based tri-layer separator design thus significantly facilitates the realization of high-energy density Li metal-based batteries.

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“…The PVDF‐ co ‐HFP/7.5 wt.% SiO 2 composite separator was therefore selected to compare with pure PVDF‐ co ‐HFP and Celgard 2325 separators since it outperforms the other composition in many respects. As shown in Figure d, the incorporation of SiO 2 into the PVDF‐ co ‐HFP polymer host enhances the separator's electrolyte wettability by decreasing the solid–liquid interfacial energy due to the nano‐SiO 2 hydrophilicity . The contact angles at the early stage of electrolyte/separator contact ( t = 2 s) show that PVDF‐ co ‐HFP/7.5 wt.% SiO 2 has the lowest contact angle (14.5°), followed by PVDF‐ co ‐HFP (19.8°) and Celgard 2325 being the worst with 48.9°.…”

Section: The Crystallinity Of Pvdf‐co‐hfp/sio2 Separators With Differmentioning

confidence: 94%

“…The elemental mapping results of the as‐prepared separator, visual in Figure c–f, demonstrate the homogeneity of nano‐SiO 2 distribution in PVDF‐ co ‐HFP host with this technique. Moreover, the high surface area of the nano‐SiO 2 also impacts the as‐prepared composite separator by enhancing its electrolyte uptake, ionic conductivity, and Li + transport efficiency . The improvement in these properties shows that the electrolyte not only penetrates into the cross‐linked polymer chains, but also is absorbed and retained by the hydrophilic SiO 2 nanoparticles .…”

Section: The Crystallinity Of Pvdf‐co‐hfp/sio2 Separators With Differmentioning

confidence: 99%

An Efficient, Scalable Route to Robust PVDF‐co‐HFP/SiO₂ Separator for Long‐Cycle Lithium Ion Batteries

Boateng

Zhu

et al. 2018

Physica Rapid Research Ltrs

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A highly uniform, heterogeneous-phase composite separator is synthesized by a direct post-solidation process from the mixture of nano-SiO 2 /acetone monodisperse suspension and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP)/acetone gel, without any organic surfactants. This technique leads to the PVDF-co-HFP/SiO 2 composite separator outstanding microstructural uniformity. The incorporation of SiO 2 nanoparticles leads to reduced crystallinity (%27%), enhanced wettability (%14%), improved electrolyte uptake (%420%), and enhanced mechanical strength (>14 MPa) of the composite separator. These enhanced properties of the separator translate into remarkable LiFePO 4 /Li battery performance with reduced polarization, a high room-temperature capacity of 165 mAh g À1 at 0.5 C, a high thermal dimensional stability (%4.5% shrinkage after annealing at 160 C for 1 h) and 5.2% capacity degradation after 1500 charge/discharge cycles at 2 C.

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Excellent rate capability and cycle life of Li metal batteries with ZrO2/POSS multilayer-assembled PE separators

Cited by 128 publications

References 31 publications

Reviving Lithium‐Metal Anodes for Next‐Generation High‐Energy Batteries

Reviving Lithium‐Metal Anodes for Next‐Generation High‐Energy Batteries

Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries

An Efficient, Scalable Route to Robust PVDF‐co‐HFP/SiO₂ Separator for Long‐Cycle Lithium Ion Batteries

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Excellent rate capability and cycle life of Li metal batteries with ZrO2/POSS multilayer-assembled PE separators

Cited by 128 publications

References 31 publications

Reviving Lithium‐Metal Anodes for Next‐Generation High‐Energy Batteries

Reviving Lithium‐Metal Anodes for Next‐Generation High‐Energy Batteries

Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries

An Efficient, Scalable Route to Robust PVDF‐co‐HFP/SiO2 Separator for Long‐Cycle Lithium Ion Batteries

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An Efficient, Scalable Route to Robust PVDF‐co‐HFP/SiO₂ Separator for Long‐Cycle Lithium Ion Batteries