电解质盐调节的结合配置和相间形成,实现可充电水性离子电池的高度稳定的阳极
Meijing Wang1, Jiaojiao Zhao1, Yangyang Zhang1
1College of Chemistry & Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, 150040, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 18, 2024
概括
一种新的缩电解质稳定了可充电水性离子电池 (ASIB) 中的酸阳极,通过防止进化和捕获氧化离子,提高了循环性能.
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
- 电池技术 电池技术
背景情况:
- 水性离子电池 (ASIB) 面临着阳极材料稳定性的挑战.
- 在水性电解质中的演变反应 (HER) 导致化,降解NaTi2(PO4) 3/C阳极.
- 低循环性能限制了ASIBs的实际应用.
研究的目的:
- 开发一种新的电解质系统,以提高ASIB中NaTi2 () (PO4) 3 / C阳极的结构稳定性和循环性能.
- 为了减轻演变反应和电解质化的负面影响.
- 调查电解质成分和添加剂在提高电池性能方面的作用.
主要方法:
- 使用NaAc和双功能Mg(Ac) 2添加剂制备一种高度缩的电解质.
- 电化学表征包括循环性能测试在100mA·g-1.
- 频谱分析 (拉曼,FTIR) 用于研究结合的配置.
- 表面分析 (EDS映射,XPS,XRD) 以确定保护界面.
主要成果:
- 缩的电解质 (4m NaAc + 3m Mg(Ac) 2) 呈现出高演变潜力 (-1.37 V 与 Ag/AgCl 相比).
- 添加剂Mg(Ac) 2有效地捕获生成的氧化离子,形成一种类似Mg(OH) 2的保护性介相.
- NaTi2 ((PO4) 3 / C阳极表现出更好的稳定性,在100个循环后保持94.8%的容量.
结论:
- 一种含有Mg(Ac) 2添加剂的高度缩的电解质提供了一种有前途的策略,可以改善ASIB中的NaTi2(PO4) 3/C阳极的循环稳定性.
- 电解质抑制HER和捕获氧化离子的能力对于阳极保护至关重要.
- 这种方法为开发耐用和高性能水性离子电池提供了新的途径.
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