通过超声波辅助无机丰富和薄薄的SEI层提高离子电池的电化学性能
Sunghyun Jie1, Joonhee Kang2, Seunghun Baek1
1School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea.
Ultrasonics sonochemistry
|September 27, 2023
概括
超声波处理通过创造有益的固体电解质间相 (SEI) 层来改善离子电池 (LIB) 的性能. 这提高了电荷传输,循环稳定性和容量保留,特别是在苛刻的条件下.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (LIB) 对于能源转型至关重要,特别是在车辆中,由于其高能量和功率密度.
- 机械因素,如振动,以及超声波对LIBs的影响还未得到充分研究.
- 众所周知,超声波可以增强质量转移和表面清洁,但其对LIBs的具体影响需要彻底调查.
研究的目的:
- 为了研究超声波对离子电池中固体电解质介相 (SEI) 层的影响.
- 为了确定超声波诱导的SEI变化如何影响电池性能,包括电荷转移和动力学.
- 评估超声波对循环稳定性和高速放电能力的影响.
主要方法:
- 超声波对离子电池的应用.
- 分析由此产生的固体电解质介相 (SEI) 层组成和结构.
- 评估电化学性能,包括电荷转移,动力学,循环稳定性和高速放电能力.
主要成果:
- 超声波处理会诱导一种薄薄的,富含无机物质的SEI层.
- 改变的SEI层改善了电荷转移,并增强了电化学动力学.
- 超声波的应用导致了更好的循环稳定性和在高充电速度下持续的放电能力.
结论:
- 超声波是一种可行的方法来修改LIB中的SEI层,从而提高性能.
- 通过超声波创建富含无机物质的SEI层可以改善电池动力学和稳定性.
- 将超声波技术与LIBs相结合,为开发高性能储能解决方案提供了一个有前途的方法.
相关概念视频
01:20Preparation of Samples for Electron Microscopy
To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...