双盐混合电解质用于高性能水性电池
Qiwen Sun1, Luning Chai1, Song Chen1
1Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, China.
ACS applied materials & interfaces
|February 19, 2024
概括
用于水性电池的新型双盐电解质通过改变离子溶解来防止腐蚀. 这提高了电池周期寿命和稳定性,为未来的电池开发提供了有前途的解决方案.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性电池为安全和低成本的储能提供了潜力.
- 液态电解质中的演变反应 (HER) 会导致腐蚀,并限制电池的性能.
- 开发稳定的电解质对于推进电池技术至关重要.
研究的目的:
- 为水性电池引入一种可减轻腐蚀的双盐电解质.
- 研究LiOTF添加对电解质的溶解结构和HER抑制的影响.
- 评估拟议的电解质的电化学性能和稳定性.
主要方法:
- 一种含有三酸盐 (AlOTF) 和三酸盐 (LiOTF) 的双盐电解质的配方.
- 电化学表征包括循环电压测量和静电循环.
- 用光谱分析研究Al3+离子的溶解结构.
主要成果:
- 双盐电解质有效地抑制了进化反应.
- 添加LiOTF改变了Al3+溶解从八面体到混合的八面体-四面体结构,减少了水分子的键.
- 电解质可以实现2.1V的高充电平台和1.5V的放电平台,使用MnO阴极.
- 实现了3.8V的改进的电化学稳定性窗口 (ESW).
- 高初始容量为437 mAh g-1 ,在100个循环后保持在103 mAh g-1 .
结论:
- 拟议的双盐电解质显著提高水性电池的稳定性和循环寿命.
- 修改后的溶解结构是抑制腐蚀性进化反应的关键.
- 这种电解质配方为开发高性能水性电池提供了可行的途径.
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