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Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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リチウム金属電池用分子自己組み立てポリロタキサン固体電解質

Peipei Ding1,2, Lingqiao Wu1,2, Zhiyuan Lin1,2

  • 1Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing100124, P. R. China.

Journal of the American Chemical Society
|January 13, 2023
PubMed
まとめ

新しいポリロタキサン電解質が 固体リチウム金属電池の性能を向上させる この分子自己組み立て戦略は,先進的なエネルギー貯蔵アプリケーションのイオン伝導性とバッテリーサイクル安定性を改善します.

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Failure Analysis of Batteries Using Synchrotron-based Hard X-ray Microtomography
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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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科学分野:

  • 材料科学
  • 電気化学
  • ポリマー化学

背景:

  • ポリエチレン酸化物) は,固体リチウム金属電池の潜在的な分離剤である.
  • その適用は,低いイオン伝導性と狭い電気化学的安定性窓 (<4.0 V vs Li/Li+) によって制限されています.

研究 の 目的:

  • 新しい分子自己組み立てのポリロタキサン電解質を設計し,製造する.
  • リチウム金属電池のイオン伝導性と電気化学的安定性を高めるため

主な方法:

  • 循環性18冠エーテル-6 (18C6) を分子間水素結合を用いて線形ポリエチレングリコール (PEG) にスレッドする.
  • ヘクサメチレンジイソシアネートトリマー (HDIt) で終了する.
  • 固体/液体核磁気共振 (NMR) による確認

主要な成果:

  • 室温のイオン伝導度は3. 48 × 10−4 S cm−1で,ポリロタキサン単位なしで1. 12 × 10−5 S cm−1から大きく増加した.
  • LiFePO4とLiNi0.8Co0.15Al0.05O2のカトド材料で強化されたサイクル安定性を実証した.
  • NMRによる 分子の自己組織化が確認された

結論:

  • 設計されたポリロタキサン電解質はリチウム金属電池の性能を改善します.
  • 先進的な固体ポリマー電解質を開発するための新しい戦略を提供します.
  • このアプローチは,従来のポリエチレン酸化物分離器の主要な限界に対処します.