Journal ArticleDOI
Effect of molecular weight on the mechanical and electrical properties of block copolymer electrolytes
Mohit Singh,Omolola Odusanya,Gregg M. Wilmes,Hany Basam Eitouni,Enrique D. Gomez,Amish J. Patel,Vincent Chen,Moon Jeong Park,Panagiota G. Fragouli,Hermis Iatrou,Nikos Hadjichristidis,David Cookson,Nitash P. Balsara +12 more
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TLDR
The relationship between ionic conductivity, morphology, and rheological properties of polystyrene-block-poly(ethylene oxide) copolymers (SEO) doped with a lithium salt, Li[N(SO2CF3)2], is elucidated in this article.Abstract:
The relationship between ionic conductivity, morphology, and rheological properties of polystyrene-block-poly(ethylene oxide) copolymers (SEO) doped with a lithium salt, Li[N(SO2CF3)2], is elucidated. We focus on lamellar samples with poly(ethylene oxide) (PEO) volume fractions, φ, ranging from 0.38 to 0.55, and PEO block molecular weights, MPEO, ranging from 16 to 98 kg/mol. The low-frequency storage modulus (G‘) at 90 °C increases with increasing MPEO from about 4 × 105 to 5 × 107 Pa. Surprisingly, the conductivity of the SEO/salt mixtures with the molar ratio of Li to ethylene oxide moieties of 0.02 σ, also increases with increasing MPEO, from 6.2 × 10-5 to 3.6 × 10-4 S/cm at 90 °C. We compare σ with the conductivity of pure PEO/salt mixtures, σPEO, and find that σ/[φσPEO] of our highest molecular weight sample is close to 0.67, the theoretical upper limit for transport through randomly oriented lamellar grains.read more
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Reviving the lithium metal anode for high-energy batteries
TL;DR: The current understanding on Li anodes is summarized, the recent key progress in materials design and advanced characterization techniques are highlighted, and the opportunities and possible directions for future development ofLi anodes in applications are discussed.
Journal ArticleDOI
Lithium metal anodes for rechargeable batteries
Wu Xu,Jiulin Wang,Jiulin Wang,Fei Ding,Xilin Chen,Eduard Nasybulin,Yaohui Zhang,Yaohui Zhang,Ji-Guang Zhang +8 more
TL;DR: In this article, various factors that affect the morphology and Coulombic efficiency of Li metal anodes have been analyzed, and the results obtained by modelling of Li dendrite growth have also been reviewed.
Journal ArticleDOI
Poly(ethylene oxide)-based electrolytes for lithium-ion batteries
Zhigang Xue,Dan He,Xiaolin Xie +2 more
TL;DR: In this article, a review of the recent developments and issues concerning polyethylene oxide (PEO) based electrolytes for lithium-ion batteries is presented, including blending, modifying and making PEO derivatives.
Journal ArticleDOI
Single-ion BAB triblock copolymers as highly efficient electrolytes for lithium-metal batteries
Renaud Bouchet,Sébastien Maria,Rachid Meziane,Abdelmaula Aboulaich,Livie Liénafa,Jean-Pierre Bonnet,Trang N. T. Phan,Denis Bertin,Didier Gigmes,Didier Devaux,Renaud Denoyel,Michel Armand +11 more
TL;DR: A multifunctional single-ion polymer electrolyte based on polyanionic block copolymers comprising polystyrene segments overcomes most of the above limitations, with a lithium-ion transport number close to unity, excellent mechanical properties and an electrochemical stability window spanning 5 V versus Li(+)/Li.
Journal ArticleDOI
Detection of subsurface structures underneath dendrites formed on cycled lithium metal electrodes.
Katherine J. Harry,Daniel T. Hallinan,Dilworth Y. Parkinson,Alastair A. MacDowell,Nitash P. Balsara +4 more
TL;DR: Synchrotron hard X-ray microtomography experiments on symmetric lithium-polymer-lithium cells cycled at 90 °C show that during the early stage of dendrite development, the bulk of the dendritic structure lies within the electrode, underneath the polymer/electrode interface.
References
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Journal ArticleDOI
Issues and challenges facing rechargeable lithium batteries
TL;DR: A brief historical review of the development of lithium-based rechargeable batteries is presented, ongoing research strategies are highlighted, and the challenges that remain regarding the synthesis, characterization, electrochemical performance and safety of these systems are discussed.
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TL;DR: In this article, the authors describe the nature of Viscoelastic behavior of polymeric systems and approximate relations among the linear Viscoels and approximate interrelations among the Viscelastic Functions.
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Connection between polymer molecular weight, density, chain dimensions, and melt viscoelastic properties
TL;DR: In this article, it was found that the mean square unperturbed end-to-end distance 0, the density ρ and molecular weight M are related to the plabteau modulus, G 0, G N 0 ∞ { 0 ρ/M} 3, a finding in accord with that of Ronca.
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