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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polyaspartate Polyurea-Based Solid Polymer Electrolyte with High Ionic Conductivity for the All-Solid-State

Lu Bai1,2, Peng Wang1, Chengyu Li1

  • 1Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China.

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|June 19, 2023
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A new solvent-free method creates advanced polyaspartate polyurea-based solid polymer electrolytes (SPEs) for safer, high-performance batteries. These novel SPEs demonstrate excellent compatibility and stability in lithium-ion battery applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Current in situ solid polymer electrolyte (SPE) preparation often involves solvents, posing process and safety challenges.
  • Developing solvent-free in situ methods for SPEs with enhanced processability and compatibility is crucial for advanced battery technologies.

Purpose of the Study:

  • To develop a novel solvent-free in situ polymerization method for preparing polyaspartate polyurea-based SPEs (PAEPU-SPEs).
  • To investigate the effect of polymer backbone composition and LiTFSI concentration on SPE properties and performance.
  • To evaluate the electrochemical performance and interfacial compatibility of the developed SPEs in lithium-ion batteries.

Main Methods:

  • Systematic synthesis of PAEPU-based SPEs by regulating the molar ratios of isophorone diisocyanate (IPDI) and isophorone diisocyanate trimer (tri-IPDI) and LiTFSI concentrations.
  • In situ polymerization technique to achieve cross-linked structures and good interfacial compatibility.
  • Electrochemical characterization, including ionic conductivity measurements and battery performance testing (Li|LiFePO4 cells).

Main Results:

  • The optimized PAEPU-SPE@D15 (IPDI/tri-IPDI ratio 2:1, 15 wt% LiTFSI) achieved an ionic conductivity of 6.80 × 10⁻⁵ S/cm at 30 °C, reaching 10⁻⁴ S/cm above 40 °C.
  • The Li|LiFePO4 battery exhibited a wide electrochemical stability window of 5.18 V and superior interfacial compatibility.
  • The battery demonstrated high discharge capacity (145.7 mAh g⁻¹ at 100th cycle), excellent capacity retention (96.8%), and high coulombic efficiency (>98.0%).

Conclusions:

  • The developed solvent-free in situ method successfully produced PAEPU-based SPEs with excellent processability and interfacial compatibility.
  • The PAEPU-SPE@D15 system offers promising performance for lithium-ion batteries, including stable cycling, good rate capability, and enhanced safety.
  • This PAEPU-based SPE system holds significant potential for future battery applications, offering advantages over traditional PEO systems.