通过溶剂分子化学进行相间工程,用于稳定的金属电池
Jiahang Chen1, Huichao Lu1, Xirui Kong2
1Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
Angewandte Chemie (International ed. in English)
|March 27, 2024
概括
新的化以太通过稳定阳极来提高金属电池的性能. 这种分子设计在广泛的温度范围内提高了循环效率和能量密度,为下一代电池铺平了道路.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属电池提供高能量密度,但面临着阳极稳定性的挑战.
- 电解质组成和溶解结构极大地影响金属电池的性能.
- 副作用和树岩的形成阻碍了金属阳极的实际应用.
研究的目的:
- 为金属电池合成具有弱溶解性质的新型化.
- 研究分子设计对电解质溶解结构和电化学性能的影响.
- 为了证明这些电解质在高能量密度金属电池,包括硫系统中的有效性.
主要方法:
- 具有特定分子结构 (较长的碳链,甲组) 的化的合成.
- 电解质的表征侧重于溶解结构 (例如,聚合数).
- 在各种温度条件下对金属电池和硫电池进行电化学测试.
- 囊细胞的制造和性能评估 (能量密度,循环寿命).
主要成果:
- 合成的乙烯表现出由于硬质效应的弱溶解能力.
- 聚合数高的电解质 (97.96%) 在25°C时达到高库伦比效率 (CE) 99.71%,在-20°C时达到98.56%.
- 硫电池在-20°C至50°C的温度下表现出色,具有富含LiF/LiO2的介相.
- 袋式电池实现了344.4Wh/kg的能量密度,在50个循环后保持了80%的容量.
结论:
- 使用分子化学的新型溶剂设计是优化溶解结构的可行策略.
- 低溶解化乙烯电解质显著提高了金属阳极的稳定性和电池性能.
- 这种方法使得高能量密度的金属电池具有更好的操作温度范围和循环寿命.
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