电解质工程用于构建具有高离子导电性的坚固相间,用于广泛温度范围的金属电池.
1School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi'an Jiaotong University, 710049, Xi'an, P. R. China.
Angewandte Chemie (International ed. in English)
|November 18, 2024
概括
一种新的双功能电解质添加剂提高了金属电池在广泛温度的性能. 这种电解质创造了一个稳定的介相,使下一代储能器件能够长期,可靠地运行.
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) 的不稳定界面限制了在不同温度下使用高容量的富层氧化物 (NCM811).
- 传统的碳酸盐电解质很难保持界面稳定性和离子运输动力学.
研究的目的:
- 开发一种双功能电解质添加剂 (EAFP),可以在广泛的温度范围内提高LMB的界面稳定性和离子传输.
- 创建一个稳定的电极/电解质介面,以提高NCM811阴极性能.
主要方法:
- 加入1,3-propanesultone作为添加剂,以创建一个定制的双功能电解质 (EAFP).
- 阴极-电解质相间结构和性能的表征.
- 在一个广泛的温度范围 (-40°C至60°C) 中,对Li能量子Li,Li能量子NCM811和石墨能量子NCM811电化学测试.
主要成果:
- 该EAFP添加剂形成了一个强大的阴极-电解质介相,具有无机内层和有机外层,增强机械稳定性和灵活性.
- 优化的介相促进了快速的Li+运输,并抑制了电解质副作用反应,从而导致低的超电位和稳定的循环.
- 在30°C的温度下,立体液体细胞的寿命达到1000小时,而立体液体NCM811袋细胞在-40°C至60°C的温度下稳定运行.
- 欧亚FP显示与LiFePO4和LiCO2阴极兼容,在1000个循环后保持67%的保留率.
结论:
- 开发的双功能电解质 (EAFP) 有效调节电极/电解质间相,使金属电池在广泛的温度条件下能够稳定高性能运行.
- 这种方法为开发适用于各种应用的全天候金属电池提供了途径.
- 电解质与不同阴极材料的广泛兼容性突出显示了它在下一代储能解决方案中的潜力.
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