低电位沉积用于无缺陷的沉积在无阳极的金属电池中
Kassie Nigus Shitaw1,2, Hailemariam Kassa Bezabh1,2, Yosef Nikodimos1,2
1NanoElectrochemistry Laboratory, Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan.
Small methods
|May 13, 2025
概括
低电位沉积 (K-UPD) 治愈金属阳极的缺陷,防止树的生长,提高电池性能. 这种方法提高了接口稳定性和在无阳极金属电池中积极利用.
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:
- 沉积的 (Li) 中的缺陷会导致无阳极Li金属电池 (AFLMB) 中的树生长和电解质反应,导致活性Li的损失.
- 开发稳定的接口和均的沉积对于AFLMB的性能和寿命至关重要.
研究的目的:
- 建立低电位沉积 (K-UPD) 作为治愈缺陷的方法,并创建稳定的K-Cu双金属接口.
- 研究K-UPD机制以减轻Li树突的生长并增强AFLMBs的接口稳定性.
主要方法:
- 系统地确定K-UPD在铜基板上的≈1.0V电位.
- 使用双金属电解质的Cu saq saqLi细胞和Cu saq saqNMC532全细胞的电化学表征.
- 密度函数理论 (DFT) 计算以确定吸附能量并确认K原子吸附.
主要成果:
- 与Cu相比,K-UPD显著降低了Li核化屏障,并减轻了由于K的优越性而导致的树生长.
- 较高的K原子表面移动性可以治愈缺陷并防止Li电解质反应,由较低的K原子吸附能证实 (-1.56 eV与Li的0.032 eV).
- 使用双金属电解质的CuidiyegaNMC532细胞实现了超过1600小时的循环,而CuidiyegaNMC532全细胞在100个循环后显示了99.6%的平均Coulombic效率 (vs. ≈98.2%没有K-UPD).
结论:
- K-UPD有效地治愈沉积的中的缺陷,并形成一个保护性的K-Cu双金属接口,促进均的沉积.
- K-Cu接口增强了电性和表面流动性,抑制了树岩的形成,改善了电池循环寿命和库伦比效率.
- 这项研究提供了关于K-UPD机制的见解,用于稳定接口和治愈下一代电池中的Li缺陷.
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