Polyethylene separators modified by ultrathin hybrid films enhancing lithium ion transport performance and Li-metal anode stability

Wang, Yanan; Shi, Liyi; Zhou, Hualan; Wang, Zhuyi; Li, Rui; Zhu, Jiefang; Qiu, Zhengfu; Zhao, Yin; Zhang, Meihong; Yuan, Shuai

doi:10.1016/j.electacta.2017.10.120

Cited by 63 publications

(48 citation statements)

References 45 publications

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“…Moreover, the R SEI for the cell with CPS is stabilized after 50 cycles, indicating more stable and suppressed SEI layer formation, which facilitates Li + transport through the interfacial layer (code 3–16). Similar changes in impedance also appear in other cells with filler‐coated PE separators, including SiO 2 ‐, [ 90 ] Al 2 O 3 ‐, [ 112,128 ] ZrO 2 ‐, [ 75 ] ZSM‐, [ 86 ] and OAPS‐coated [ 71 ] separators, indicating improved electrolyte/electrode interfaces and stable and suppressed SEI layer formation due to the filler coatings. These results were ascribed to the fact that the surface coated fillers enhance hydrophilicity and affinity with the electrolyte, leading to improved electrolyte adsorption and ion conduction in the coated separators.…”

Section: Composite Polymer Separator For Conventional Li‐based Secondsupporting

confidence: 68%

Section: Composite Polymer Separator For Conventional Li‐based Secondmentioning

confidence: 99%

“…Another example is presented by the same group, who coated a PE separator with an octaammonium polyhedral oligomeric silsesquioxane (OAPS)/PDA crosslinked layer by dipping the PE in an OAPS/dopamine mixed solution to promote polymerization through imidization between o ‐quinone groups and amine groups (Figure 2f). [ 71 ] They found that the thickness and porous structure of separators were maximally preserved due to the intrinsic characteristics of the dopamine self‐polymerization modification method. Therefore, owing to the synergistic contributions of increased wettability and the well‐preserved porous structure, the prepared OAPS/PDA CPS exhibits apparent improvements in EU (η EU = 178.3%), σ ( η σ = 25%) and t Li + ( η t = 27%) (code 1–12).…”

Section: Composite Polymer Separator For Conventional Li‐based Secondmentioning

confidence: 99%

See 2 more Smart Citations

Tough and Flexible, Super Ion‐Conductive Electrolyte Membranes for Lithium‐Based Secondary Battery Applications

Mong

Shi

Jeon

et al. 2020

Adv Funct Materials

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Recently, stringent requirements brought on by environmental regulations and safety issues are driving the development of solid electrolytes to replace conventional liquid electrolyte systems for lithium‐based secondary batteries (LiBs). However, the low Li‐ion conductivity and/or poor mechanical properties of electrolytes remain the main obstacles hindering their commercialization. Hierarchitectural and composite polymer separators (CPSs) based on electrolyte membranes have been reported as promising tools for both high ionic conductivity and mechanical stability. In light of such work, the new types of flexible electrolytes based on phase‐separated and mixed‐phase morphologies achieved via self‐assembly and the use of functional molecular composites are reviewed along with the fundamental mechanisms associated with such systems. In particular, the structure and morphology, ionic conductivity, thermal/mechanical stability, and fabrication of polymer electrolytes are introduced. Additionally, recent advancements in CPSs including methods of ensuring low interfacial resistance, the respective contributions of these critical factors to the significant functional properties of CPSs, and directions for development and essential applications in the field of CPSs for LiBs are presented. Based on previous works, the perspectives put forth will aid in the design of advanced electrolytes for practical Li secondary batteries in the near future.

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Section: Composite Polymer Separator For Conventional Li‐based Secondsupporting

confidence: 68%

Section: Composite Polymer Separator For Conventional Li‐based Secondmentioning

confidence: 99%

Section: Composite Polymer Separator For Conventional Li‐based Secondmentioning

confidence: 99%

See 1 more Smart Citation

Tough and Flexible, Super Ion‐Conductive Electrolyte Membranes for Lithium‐Based Secondary Battery Applications

Mong

Shi

Jeon

et al. 2020

Adv Funct Materials

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show abstract

“…The Li + transference number is affected by the many factors such as the thickness of separators, the porous structure of separators, and the affinity of separators to the electrolyte. The increased separators thickness and difference in surface components may lead to the decrease of the Li + ion transference number …”

Section: Resultsmentioning

confidence: 99%

Delamination‐Free Multifunctional Separator for Long‐Term Stability of Lithium‐Ion Batteries

Lee

Kim

Kim³

et al. 2019

Small

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Next‐generation lithium‐ion batteries (LIBs) that satisfy the requirements for an electric vehicle energy source should demonstrate high reliability and safety for long‐term high‐energy‐density operation. This inevitably calls for a novel approach to advance major components such as the separator. Herein, a separator is designed and fabricated via application of multilayer functional coating on both sides of a polyethylene separator. The multilayer‐coated separator (MCS) has a porous structure that does not interfere with lithium ion diffusion and exhibits superior heat resistance, high electrolyte uptake, and persistent adhesion with the electrode. More importantly, it enables high capacity retention and reduced impedance build up during cycling when used in a coin or pouch cell. These imply its promising application in energy sources requiring long‐term stability. Fabrication of the MCS without the use of organic solvents is not only environmentally beneficial but also effective at cost reduction. This approach paves the way for the separator, which has long been considered an inactive major component of LIBs, to become an active contributor to the energy density toward achieving longer cycle stability.

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“…In addition, the use of functional nanomaterials dispersible in a polar solvent is strictly limited. To overcome these problems, significant research has been performed that includes mussel-inspired dopamine coating of separators 22,24–26 .…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide Induced Surface Modification for Functional Separators in Lithium Secondary Batteries

Kim

Shin

Kim

et al. 2019

Sci Rep

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Functional separators, which have additional functions apart from the ionic conduction and electronic insulation of conventional separators, are highly in demand to realize the development of advanced lithium ion secondary batteries with high safety, high power density, and so on. Their fabrication is simply performed by additional deposition of diverse functional materials on conventional separators. However, the hydrophobic wetting nature of conventional separators induces the polarity-dependent wetting feature of slurries. Thus, an eco-friendly coating process of water-based slurry that is highly polar is hard to realize, which restricts the use of various functional materials dispersible in the polar solvent. This paper presents a surface modification of conventional separators that uses a solution-based coating of graphene oxide with a hydrophilic group. The simple method enables the large-scale tuning of surface wetting properties by altering the morphology and the surface polarity of conventional separators, without significant degradation of lithium ion transport. On the surface modified separator, superior wetting properties are realized and a functional separator, applicable to lithium metal secondary batteries, is demonstrated as an example. We believe that this simple surface modification using graphene oxide contributes to successful fabrication of various functional separators that are suitable for advanced secondary batteries.

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Polyethylene separators modified by ultrathin hybrid films enhancing lithium ion transport performance and Li-metal anode stability

Cited by 63 publications

References 45 publications

Tough and Flexible, Super Ion‐Conductive Electrolyte Membranes for Lithium‐Based Secondary Battery Applications

Tough and Flexible, Super Ion‐Conductive Electrolyte Membranes for Lithium‐Based Secondary Battery Applications

Delamination‐Free Multifunctional Separator for Long‐Term Stability of Lithium‐Ion Batteries

Graphene Oxide Induced Surface Modification for Functional Separators in Lithium Secondary Batteries

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