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基于的低温和高性能水性离子电池
Tao Jin1,2, Xiling Ye1,2, Zhuo Chen1,2
1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, Fujian, P. R. China.
ACS applied materials & interfaces
|January 18, 2024
概括
这项研究引入了用于水性离子电池的新型电解质添加剂系统,提高了低温性能和稳定性. 新系统有效地抑制了树的生长,并在-30°C下保持高容量.
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:
- 水性离子电池 (AZIB) 提供安全和经济高效的能量存储,但在低温下表现不佳,包括树的生长和容量衰减.
- 低温加剧了格子收缩,缓慢的电荷转移和固相扩散等问题,阻碍了AZIB的功能并限制了它们的实际应用.
研究的目的:
- 开发一种高性能的AZIB系统,能够在低温下稳定运行.
- 解决关键挑战,如树岩的形成,阴极溶解,并在零度以下的环境中容量退化.
主要方法:
- 使用瓦纳酸盐 (MVO) 作为阴极材料,以提高结构稳定性和特异性容量.
- 纳入乙烯基醇 (EG) 和硫酸 (MSO) 作为电解质添加剂,以减轻结点并促进离子溶解.
- 研究了MVO,MSO和EG在低温下对阳极保护和阴极稳定性的协同作用.
主要成果:
- 开发的EG@0.2 M MnSO + 2 M ZnSO 电解质使稳定的Zn能电池在-30°C和1 mA cm-2下在350小时内运行.
- 基基Cu细胞在0.2 mA cm-2的2000个循环中显示出100%的库伦比效率.
- 该Zn下载RadioMVO电池实现了231.13mA小时-1的初始特定容量,在1000个循环后保持超过85%,超过现有的低温AZIB系统的性能.
结论:
- MVO阴极,MSO的Mn2+阴离子盾和基于EG的电解质的协同组合有效地抑制了树突的生长,并提高了低温性能.
- 这种新的电解质配方为在寒冷环境中运行的可靠和高容量的水性离子电池提供了有希望的解决方案.
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