阳极电解策略启用Fe/FeCl2电极用于可扩展的Fe/FeCl2-石墨盐电池
Wenlong Zhang1, Huanxin Li2,3, Xiaohui Ning1
1Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China.
ACS applied materials & interfaces
|June 3, 2024
概括
一种新的电化学阳极电解 (EAE) 方法提高了盐电池的铁电极的稳定性和可扩展性. 这一突破解决了关键的局限性,使得更可靠的大规模储能解决方案成为可能.
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:
- 铁/FeCl2 - 石墨盐电池由于寿命长,操作温度低,成本效益高,因此具有大规模储能潜力.
- 目前的局限性包括缺乏可扩展的制备方法和Fe/FeCl电极的氧化还原稳定性不足,阻碍了实际应用.
研究的目的:
- 开发一个可扩展和可靠的Fe/Fe2+负电极的制备策略,用于Fe/FeCl2 - 石墨融盐电池.
- 为了解决FeCl2作为这些电池中的活性物质的氧化还原稳定性问题.
主要方法:
- 引入一种电化学阳极电解 (EAE) 策略,使用一个AlAlCl3/NaCl/LiClFe系统进行Fe → Fe2+转换.
- 在电极表面形成保护性氧化膜,以防止溶解.
- 验证EAE策略在静电和静电过程中,以及在容量扩大的电池中.
主要成果:
- 经过7000次低极化 (∼29 mV) 的循环,EAE准备的Fe/Fe2+电极显示出0.72 mAh/cm2的稳定容量.
- 潜在静电EAE电极在1000次循环后达到14mAh,保持85%的电容和98%的库伦比效率.
- 可扩展性证明,容量扩展的电池在1000个循环后达到155.1 mAh (94%的保留率),生产率为68.6 m2 / day.
结论:
- 该EAE策略有效地提高了盐电池Fe/Fe2+电极的氧化还原稳定性和循环寿命.
- 这种方法提供了一个可扩展和可靠的方法,用于准备先进的负电极.
- 成功组装0.42Ah的Fe/FeCl2石墨电池为这种储能技术的商业化铺平了道路.
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