在in situ工程无机丰富的固体电解质介面通过阳离子选择使稳定,阳极
Jason A Weeks1, James N Burrow2, Jiefeng Diao1,3
1Department of Chemistry, The University of Texas at Austin, Austin, TX, 78712-1224, USA.
Advanced materials (Deerfield Beach, Fla.)
|September 6, 2023
概括
开发用于高能电池的稳定阳极需要液体电解质,以形成保护性固体电解质介面 (SEI). 基于四基 (THF) 的电解质与特定的盐,特别是LiDFOB,能够形成强大的SEI和卓越的电池性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 电池技术 电池技术
背景情况:
- 稳定的固体电解质介面 (SEI) 对于在下一代高能电池中实现无树脂的金属阳极至关重要.
- 基于四基 (THF) 的电解质通过鼓励离子分解,促进富含无机物SEI的形成,优于传统有机溶剂.
研究的目的:
- 研究THF电解质中的不同盐 (LiPF6,LiTFSI,LiFSI,LiDFOB) 如何影响SEI的组成和特性.
- 为了证明基于LiDFOB的电解质对高稳定性阳极和Li//LFP电池性能的有效性.
主要方法:
- 用各种盐制备和测试电解质.
- 飞行时间二次离子质谱学 (ToF-SIMS) 与高级分析 (等级聚类,集成产量) 用于检查SEI的组成和形态.
- 对称的电池和Li//LFP电池进行循环测试,以评估电池的性能.
主要成果:
- 电解质离子被证明可以显著调节SEI的无机成分和特性.
- LiDFOB电解质在具有高稳定性的对称细胞中实现了超过1500个循环.
- 使用LiDFOB的Li//LFP电池表现出高率可逆储存,在300个周期内保持87.5%的容量.
结论:
- 基于LiDFOB的电解质在形成稳定,富含无机的SEI方面非常有效,这对于推进金属阳极技术至关重要.
- 这项工作为设计用于高能耗,长寿命电池的先进电解质提供了途径.
相关概念视频
Formation of Complex Ions
23.7K
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...
23.7K
Ion Exchange
621
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
621
Extraction: Advanced Methods
482
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...
482
Electrodeposition
664
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...
664


