固体聚合物电解质的分子设计,用于具有攻击性阴极化学的金属电池
1Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing 100871, China.
Journal of the American Chemical Society
|September 26, 2024
概括
这项研究引入了基于聚碳酸的新型聚合物电解质 (PCCE) 用于高能金属电池 (LMB). 这些PCCE具有增强的离子导电性和稳定性,为更安全,更高效的电池技术铺平了道路.
科学领域:
- 材料科学
- 电化学
- 聚合物化学
背景情况:
- 固体聚合物电解质对于开发下一代高能金属电池至关重要.
- 特殊电池的主要挑战包括实现高离子导电性,高Li+转移数和广泛的电化学窗口.
- 目前的SPE经常难以平衡这些特性,限制了LMB的性能和安全性.
研究的目的:
- 开发一种新的聚碳酸基共聚合物电解质 (PCCE),具有量身定制的离子传输特性.
- 研究一种对SPEs的阳离子和离子溶解进行调节的和操纵策略.
- 用先进的阴极材料在高能LMB中证明这些PCCE的性能.
主要方法:
- 聚合物骨干的分子设计通过整合弱和强碳酸盐段.
- 引入基于bis-acrylamide的交联段,用于机械强度和离子相互作用.
- PCCE的制造和电化学特性,包括离子导电性,转移数和LMB的循环稳定性测试.
主要成果:
- 设计的PCCE在25°C时实现了高离子导电率 (0.66mS cm-1) 和高Li+转移率 (0.76).
- PCCE表现出极好的氧化稳定性,使其能够在高切断电压 (4.5V和5.0V) 上工作.
- 使用PCCE的LMB使用LiNi0.8Co0.1Mn0.1O2阴极在800个循环中保持了82.2%的容量,使用LiNi0.5Mn1.5O4阴极在300个循环中保持了96.4%.
结论:
- 和操纵策略有效调节阴离子/阴离子溶解,从而获得优异的SPE性能.
- 由于其离子导电性,稳定性和机械强度,开发的PCCE对高能LMB非常有希望.
- 这种分子设计方法为创建下一代电池的先进固体聚合物电解质提供了新的视角.
更多相关视频
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
12.9K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.4K
相关概念视频
00:56Extraction: Advanced Methods
432
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...
432
03:00Electrolysis
26.2K
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...
26.2K
02:48Ionic Bonding and Electron Transfer
41.3K
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.
41.3K