在现场将符合形式的牺牲层转换为坚固的相间层,稳定了用于水性离子存储的化聚离子阴极
Peng Gong1,2, Shibo Chai2, Xingjie Li2
1School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
概括
研究人员开发了一种新的方法,通过将有害的副产品转化为保护层来改善离子储存. 这增强了在水性电解质中的和氧酸 (NVOPF) 的稳定性和性能.
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:
- 和氧酸 (NVOPF) 是对高压,高容量的水性离子储存有希望的.
- 界面降解和酸 (HF) 副产品限制了NVOPF在水性电解质中的周期寿命.
研究的目的:
- 克服NVOPF在水性电解质中的局限性,通过在现场将有害的HF衍生物转化为保护性阴极电解质介相 (CEI).
- 为了证明氧化 (Al2O3) 牺牲层在产生强大的含CEI时的有效性.
主要方法:
- 预涂NVOPF与符合规范的Al2O3牺牲层,以在现场产生富含AlF3的CEI.
- 描述CEI化学的演变及其对界面反应,溶解和Na+运输的影响.
- 将修改后的NVOPF与伪电容性阳极和水凝电解质集成,以构建一个准固态离子混合电容器.
主要成果:
- 富含AlF3的CEI有效地减轻了接口副作用,抑制了溶解,并增强了Na+运输动力学.
- 在循环稳定性 (3.15x容量保留),速率能力和低温性能 (1.5x在-20°C的容量) 中取得了显著的改进.
- 开发的准固态离子混合电容器表现出极好的循环寿命 (77.0%在1000个循环后),高能量/功率密度和安全性.
结论:
- 通过Al2O3牺牲层在现场形成保护CEI是一种可行的策略,可以使不稳定的电极材料,如NVOPF在水性电解质中.
- 这种方法显著提高了电化学性能和稳定性,为实际的水性离子储能铺平了道路.
- 该研究强调了先进接口工程在开发下一代能源存储设备和系统方面的潜力.
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