Ion transport in composite polymer electrolytes

Materials Advances, Год журнала: 2022, Номер 3(9), С. 3809 - 3819

Опубликована: Янв. 1, 2022

Composite polymer electrolytes have excellent comprehensive properties among all electrolytes; the detailed ion-transport mechanisms in composite are reviewed.

Язык: Английский

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Covalent Organic Framework with Multi‐Cationic Molecular Chains for Gate Mechanism Controlled Superionic Conduction in All‐Solid‐State Batteries

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(25)

Опубликована: Март 30, 2023

Although solid-state batteries (SSBs) are high potential in achieving better safety and higher energy density, current electrolytes (SSEs) cannot fully satisfy the complicated requirements of SSBs. Herein, a covalent organic framework (COF) with multi-cationic molecular chains (COF-MCMC) was developed as an efficient SSE. The MCMCs chemically anchored on COF channels were generated by nano-confined copolymerization cationic ionic liquid monomers, which can function Li+ selective gates. coulombic interaction between anions leads to easier dissociation from coordinated states, thus transport is accelerated. While movement restrained due charge interaction, resulting conductivity 4.9×10-4 S cm-1 transference number 0.71 at 30 °C. SSBs COF-MCMC demonstrate excellent specific density 403.4 Wh kg-1 cathode loading limited Li metal source.

Язык: Английский

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Multicomponent Covalent Organic Framework Solid Electrolyte Allowing Effective Li-Ion Dissociation and Diffusion for All-Solid-State Batteries

ACS Nano, Год журнала: 2023, Номер 17(17), С. 17372 - 17382

Опубликована: Авг. 25, 2023

Organic solid electrolytes compatible with all-solid-state Li metal batteries (LMBs) are essential to ensuring battery safety, high energy density, and long-term cycling performance. However, it remains a challenge develop an approach provide organic capabilities for the facile dissociation of strong Li-ion pairs fast transport ionic components. Herein, diethylene glycol-modified pyridinium covalent framework (DEG-PMCOF) well-defined periodic structure is prepared as multicomponent electrolyte cationic moiety polarity, additional flexible ion-transporter, ordered channel LMBs. The DEG-containing groups DEG-PMCOF allow lower salts smaller barrier transport, leading ion conductivity (1.71 × 10-4 S cm-1) large transfer number (0.61) at room temperature in electrolyte. exhibits wide electrochemical stability window effectively suppresses formation dendrites dead Molecular dynamics density functional theory simulations insights into mechanisms enhanced driven by integrated diffusion process based on hopping motion, vehicle free DEG-PMCOF. LMB assembled displays specific capacity retention 99% outstanding Coulombic efficiency various C-rates during cycling. This can offer effective route design solid-state batteries.

Язык: Английский

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Decoding Polymer Architecture Effect on Ion Clustering, Chain Dynamics, and Ionic Conductivity in Polymer Electrolytes

ACS Applied Energy Materials, Год журнала: 2023, Номер 6(7), С. 4053 - 4064

Опубликована: Март 23, 2023

Poly(ethylene oxide) (PEO)-based polymer electrolytes are a promising class of materials for use in lithium-ion batteries due to their high ionic conductivity and flexibility. In this study, the effects architecture including linear, star, hyperbranched salt (lithiumbis(trifluoromethanesulfonyl)imide (LiTFSI)) concentration on glass transition (Tg), microstructure, phase diagram, free volume, bulk viscosity, all which play significant role determining electrolyte, have been systematically studied PEO-based electrolytes. The branching PEO widens liquid toward lower concentrations, suggesting decreased crystallization improved ion coordination. At loadings, clustering is common electrolytes, yet cluster size distribution appear be strongly architecture-dependent. Also, maximized at [Li/EO ≈ 0.085] architectures, highly branched polymers displayed as much three times higher (with respect linear analogue) same total molar mass. architecture-dependent attributed enhanced volume measured by positron annihilation lifetime spectroscopy. Interestingly, despite strong dependence conductivity, addition architectures results accelerated similar monomeric friction coefficients these polymers, offering potential decoupling from segmental dynamics leading outstanding battery performance.

Язык: Английский

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Typology of Battery Cells – From Liquid to Solid Electrolytes

Advanced Science, Год журнала: 2023, Номер 10(33)

Опубликована: Сен. 26, 2023

Abstract The field of battery research is bustling with activity and the plethora names for batteries that present new cell concepts indicative this. Most have grown historically, each focus in their own time, e.g. lithium‐ion batteries, lithium‐air solid‐state batteries. Nevertheless, all are essentially made two electrode layers an electrolyte layer. This lends itself to a systematic comprehensive approach by which identify type chemistry at glance. recent increase hybridized potentially opens world types. To retain overview this dynamic field, briefly discussed typology cells proposed form short universal naming system AAM XEB CAM (AAM: anode active material; X: L (liquid), G (gel), PP (plasticized polymer), DP (dry S (solid), H (hybrid); EB: battery; CAM: cathode material). classification based on principal ion conduction mechanism during operation. Even though presented initiates from fields lithium‐ion, hybrid concepts, it applicable any chemistry.

Язык: Английский

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