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Superconductor01:24

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Highly Conductive Solid-State Hybrid Electrolytes Operating at Subzero Temperatures.

Taeyoung Kwon1, Ilyoung Choi1, Moon Jeong Park1

  • 1Division of Advanced Materials Science and ‡Department of Chemistry, Pohang University of Science and Technology (POSTECH) , Pohang 790-784, Korea.

ACS Applied Materials & Interfaces
|June 29, 2017
PubMed
Summary
This summary is machine-generated.

This study presents a novel solid-state polymer electrolyte for excellent subzero battery performance. The innovative design inhibits dendrite growth and enhances conductivity, paving the way for advanced energy storage solutions.

Keywords:
lithium batteriesporous nanoparticlessolid-state polymer electrolytessuccinonitrilesurface chemistry

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Conventional solid-state polymer electrolytes face challenges in achieving high conductivity and stability, especially at subzero temperatures.
  • Lithium dendrite growth remains a critical issue hindering the safety and performance of solid-state batteries.
  • Existing battery separators often exhibit limitations in mechanical strength and electrolyte retention.

Purpose of the Study:

  • To develop a unique, highly conductive, and dendrite-inhibited solid-state polymer electrolyte platform.
  • To demonstrate excellent battery performance at subzero temperatures using the novel electrolyte.
  • To advance solid-state polymer electrolyte technology beyond conventional battery separators.

Main Methods:

  • Fabrication of solid-state hybrid polymer electrolytes using succinonitrile (SN) electrolytes and functionalized inorganic nanoparticles with interconnected mesopores.
  • Utilizing a simple UV-curing process for electrolyte fabrication.
  • Characterization of ionic conductivity, electrochemical stability, lithium dendrite inhibition, and battery performance at various temperatures.

Main Results:

  • The hybrid electrolytes demonstrated effective confinement of SN electrolytes within mesopores, enhancing lithium ion interactions and mechanical strength.
  • Significant inhibition of lithium dendrite growth and improved electrochemical stability up to 5.2 V were achieved.
  • High ionic conductivities of 2 × 10-3 S cm-1 at room temperature and >10-4 S cm-1 at subzero temperatures were recorded.
  • Li cells with lithium titanate anodes showed stable discharge capacities of 151 mAh g-1 below -10 °C (92% of room temperature capacity).

Conclusions:

  • The developed solid-state polymer electrolyte platform offers a significant advancement in battery technology.
  • The unique nanoparticle-based design enables high conductivity and dendrite inhibition, crucial for subzero temperature operation.
  • This technology surpasses the performance of conventional polymeric battery separators, offering a promising solution for next-generation batteries.