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関連する概念動画

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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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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Electrogravimetric Analysis: Overview01:30

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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
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Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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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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精電解質リチウム硫黄電池におけるカソッド運動の評価

Zi-Xian Chen1,2, Qian Cheng1,2, Xi-Yao Li3

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

Journal of the American Chemical Society
|July 10, 2023
PubMed
まとめ

リチウム硫黄 (Li-S) バッテリーに含まれる薄い電解質は性能を低下させる. この研究は,硫黄核化中の活性化偏分を重要な限界として特定し,Li-Sバッテリーの設計を改善するための洞察を提供します.

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科学分野:

  • 材料科学
  • 電気化学
  • エネルギー貯蔵

背景:

  • リチウム硫黄 (Li-S) バッテリーは,リチウムイオン技術を超える高いエネルギー密度の可能性を提供します.
  • 高エネルギー密度を達成するには,電解質の乏しい状態が必要で,これはパラドックス的にバッテリーの性能,特に硫黄カソッド運動を低下させます.

研究 の 目的:

  • Li-S電池の薄電解質条件下における硫黄カトドの主な運動制限因子を体系的に分離し,特定する.
  • Li-S バッテリーの性能を向上させるための効果的な戦略を開発するためのガイドラインを提供すること.

主な方法:

  • 電気化学阻力スペクトロスコーピー (EIS) と ギャルバノスタティック・インターミテント・タイトレーション・テクニック (GITT) を組み合わせた方法を開発した.
  • カソード偏振を活性化,濃度,オーム分子の解離

主要な成果:

  • 硫化リチウムの核化中の活性化極化が,電解質と硫黄 (E/S) の比率が低下するにつれて,性能を制限する支配的要因として特定された.
  • 薄い電解質の性能低下の主な理由として,インターフェシャルの負荷移転運動が確認されました.
  • 新しいリチウムビス (fluorosulfonyl) イミド電解質は活性化偏振を低下させ,Li-S電池は4μL mg-1 (0.2C) の低いE/S比で985 mAh g-1を達成することができる.

結論:

  • 硫化リチウムの核形成中の活性化ポラリゼーションは,薄電解質のLi-S電池における重要なボトルネックである.
  • この発見は,電解質の改変などの標的型戦略の設計を導き,運動的制限を克服し,Li-Sバッテリー技術を前進させる.