関連する実験動画
Updated: Apr 18, 2026
07:23
Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
33.2K
リチウムのリエントラントの局所環境と,リチウムとMnに富んだリチウムイオン電池カトドの欠陥による電気化学
Fulya Dogan1, Brandon R Long, Jason R Croy
1Chemical Sciences and Engineering Division, ‡Materials Sciences Division, and §X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States.
Journal of the American Chemical Society
|January 31, 2015
まとめ
(6) Li マジック・アングル・スピニング NMRを用いたリチウムとマンガンに富んだ層状酸化物の調査は,経路に依存するリチウムの場所の占有を明らかにする. この構造的洞察は,電気化学的ヒステレスと二次電池における移行金属移動の影響を説明します.
科学分野:
- 材料科学 材料科学とは
- 電気化学 電気化学について
- 固体化学 固体化学
背景:
- 構造と電気化学活動の関係を理解することは,二次電池の開発に不可欠です.
- 局所的なリチウム環境の特徴づけは,インターカレーション材料の最適化に不可欠です.
- (6) Li MAS NMRは,サブナノメートルスケールの構造分析のためのユニークなツールです.
研究 の 目的:
- 活性化されたリチウムとマンガンに富んだ過渡金属酸化物の複雑な電気化学的振る舞いを調査する.
- サイクル中の電気化学的ヒステレスと構造的再編成を相関させる.
- 特定のリチウム部位と,バッテリー性能におけるその役割を特定し,特徴づけること.
主な方法:
- (6) Li マジック・アングル・スピニング (MAS) 核磁共振 (NMR) スペクトロスコーピーを利用する.
- リチウムイオン (Li-ion) インターカレーション電極を分析し,0.5(6) Li2MnO3·0.5(6) LiMn(0.5) Ni(0.5) O2.5 で構成されています.
- リチウムの挿入と抽出プロセスを観察する.
主要な成果:
- 経路に依存するリチウムサイト占有の直接的な証拠が観察されました.
- LiMn6-TM(tet) サイトに割り当てられた ~1600 ppmの新しい (6) Li NMR共鳴が特定されました.
- TM層リチウム部位の喪失によって示される可逆的なTM移動は,サイクリング中に限られていた.
結論:
- 構造の再編成と経路に依存するリチウムの占有は,電気化学的ヒステレスと直接相関しています.
- 再侵入型四面体変遷金属 (TMs) はリチウムのサイト占拠と電気化学的行動に影響を与えます.
- 希釈された欠陥部位でさえ,リチウムイオンインターキャレーション材料の全体的な電気化学性能に大きな影響を与えます.
関連する概念動画
03:12Batteries and Fuel Cells
32.2K
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...
32.2K
02:47Voltaic/Galvanic Cells
70.6K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
70.6K
03:00Electrolysis
32.1K
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...
32.1K
01:30Processes at Electrodes
90
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
90
01:08Electrodeposition
2.4K
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...
Electrodeposition can...
2.4K
04:02Weak Acid Solutions
46.4K
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...
46.4K