高安定性水性マグネシウムイオンフルバッテリーにおける固体-電解質インターフェーズのテルナリーユーテクティック電解質補助形成とダイナミック呼吸効果
Xinmei Song1, Yang Ge1, Hao Xu1
1State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, Tianchang New Materials and Energy Technology Research Center, Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China.
Journal of the American Chemical Society
|February 27, 2024
まとめ
マグネシウムイオン水性電池を 強化する新型三重型深層エレクトロライト この電解質の設計は,電極の互換性とバッテリーの性能を向上させ,より安全で持続可能なエネルギー貯蔵の道を開きます.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- 再充電可能な水性マグネシウム電池は安全で費用対効果があり,持続可能なエネルギー貯蔵を提供します.
- 主な制限は,狭い電圧範囲と電気解質と電極の互換性が悪いことです.
研究 の 目的:
- マグネシウムイオン電解質を開発する.
- 水性マグネシウムイオン電池の性能と安定性を高めるため
主な方法:
- 競争性溶解によって最適化された三元深層エレクトロライト (MgCl2·6H2O,アセタミド,尿素; 1:1:7モラー比) の配列.
- Mn-ドーピングされたナトリウムバナダート (Mn-NVO) アノドと銅ヘクサシアノフェラートカトドを用いた完全なバッテリーの製造と試験.
- 固体-電解質インターフェーズ (SEI) の貯蔵メカニズムと振る舞いを明らかにするために,Ex-situ特徴とスペクトロスコピク分析を行う.
主要な成果:
- 三重電解質は高電圧の平準化とフルバッテリーでの高速度の能力を可能にしました.
- 安定したサイクリング性能が達成され,電極互換性が向上しました.
- 現場試験では,Mn-NVOに独特のMg2+貯蔵メカニズムと,アノドに"呼吸効果"を持つダイナミックなSEIを明らかにした.
結論:
- 合理的な電解質設計は,有利な固体-電解質インターフェーズ (SEI) の開発に不可欠です.
- 最適化されたSEIは,電極材料の溶解と副作用を軽減し,バッテリーの安定性を高めました.
- この研究は,電解質と電極の相乗効果を向上させることで,水性多価イオン電池技術を進歩させています.
関連する概念動画
01:21Chemical Equilibria: Systematic Approach to Equilibrium Calculations
702
Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
The first step is to identify all the chemical reactions involved, The...
The first step is to identify all the chemical reactions involved, The...
702
00:42Ionic Bonds
118.4K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.4K
03:12Batteries and Fuel Cells
27.4K
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...
27.4K
01:19Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K
03:45Formation of Complex Ions
23.6K
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...
23.6K
02:48Ionic Bonding and Electron Transfer
41.6K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.6K