宽温度 500 Wh kg-1 金属袋式电池
Zichun Xiao1, Xu Liu2, Feng Hai1
1School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China.
Angewandte Chemie (International ed. in English)
|May 11, 2025
概括
一种新的电解质使金属电池能够在-40°C至60°C之间有效工作. 这种广泛的温度范围是通过优化固体电解质间相 (SEI) 来提高离子传输和稳定性来实现的.
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:
- 金属电池 (LMB) 由于温度波动而面临性能限制.
- 在广泛的温度范围内运行LMB仍然是实际应用的重大挑战.
研究的目的:
- 开发一种广泛适应温度的电解质,以提高LMB的性能.
- 研究固体电解质介相 (SEI) 在温度依赖的LMB行为中的作用.
主要方法:
- 用于LMBs的新型电解质的配方和测试.
- 大尺寸袋式电池在广泛的温度范围 (-40°C至60°C) 中对电化学性能进行评估.
- 分析SEI的组成及其对离子运输和树岩形成的影响.
主要成果:
- 开发的电解质使LMB能够在-40°C至60°C的温度下运行,具有出色的电化学性能.
- 大型5.8Ah袋式电池实现了高能量密度 (503.3Wh kg-1在25°C,339Wh kg-1在-40°C).
- 鉴定出一种富含LiF的离子衍生的SEI,它促进Li+的扩散和溶解,从而抑制低温下树的生长.
结论:
- 在金属电池中,SEI化学对于实现广泛温度运行至关重要.
- 优化的SEI特性增强了离子动力学和抑制了树突形成,使LMB在极端条件下保持稳定的性能.
- 这项研究为坚固的金属电池铺平了道路,适合各种环境条件.
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