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高溶解尿素作为有效的质子捐赠者-接受者,用于可持续的离子存储,超出单离子选择标准
Li Tao1, Xuejun Lu1,2, Keqi Qu1
1School of Engineering, Faculty of Applied Science, University of British Columbia, Kelowna, BC, V1V 1V7, Canada.
Small (Weinheim an der Bergstrasse, Germany)
|January 24, 2024
概括
这项研究引入了一种基于双离子尿素的新型电解质,用于水性离子电池,提高性能和耐用性. 新系统为储能技术提供了可持续,安全和成本效益的替代方案.
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
- 可持续能源 可持续能源
背景情况:
- 商用水性离子电池通常需要高盐度,限制性能和安全性.
- 尿素与水的混合物表现出对电解质有益的优性质.
- 目前的电解质面临尿素采用和单离子限制的挑战.
研究的目的:
- 开发一种基于双离子尿素 (DAU) 的新型电解质,用于水性Zn离子电化学能量存储 (AZEES).
- 为了提高电解质稳定性,库伦比克效率和循环寿命.
- 为了证明DAU电解质在商业AZEES设备中的实用性.
主要方法:
- 使用双Zn盐和尿素-H2O溶液,制备一种基于双离子尿素的电解质.
- 对Zn//Cu和Zn//Zn对称电池进行电化学测试,以测试剥离/板的耐用性.
- 组装和循环Zn//活性炭全细胞在硬币和袋子配置.
主要成果:
- 优化的ZT2S0.5-20U电解质在剥离/合试验中实现了93.2%的初始库伦比克效率和约4000小时的耐用性.
- Zn//活性炭全电池在50,000个周期 (硬币电池) 中保持了~100%的电容,在20,000个周期 (袋电池) 中保持了~98%的电容.
- 演示了一个大面积 (12x12厘米) 的袋式电池,具有具有成本效益的,防和不易燃的DAU电解质.
结论:
- 该DAU电解质系统使稳定的电双层结构和现场SEI形成.
- 这种以尿素为基础的系统克服了AZEES商业化的关键技术障碍.
- 开发的电解质为下一代能源存储提供了一个有希望的,可持续的和安全的解决方案.
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