有机酸盐添加剂用于碳酸盐电解质中的高速率和大容量的金属阳极
Chao Chen1, Qingfeng Zhou1, Xiaodan Li1
1School of Environment and Energy, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510006, China.
Small methods
|October 16, 2023
概括
化聚烯酸 (PCL-ONO2) 是一种用于高压金属电池的新增剂. 它在阳极上形成了一层保护层,使得在高容量和电流密度下能够稳定循环.
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
- 聚合物化学 聚合物化学
背景情况:
- 酸提高了金属阳极在以太电解质中的稳定性,但在碳酸盐电解质中溶解度较低.
- 高压金属电池需要在碳酸盐电解质中稳定的阳极接口.
研究的目的:
- 为碳酸盐电解质中高度酸盐离子引入一种新型电解质添加剂,化聚烯酸 (PCL-ONO2).
- 研究PCL-ONO2在金属阳极上的界面稳定机制.
- 为了评估金属电池的电化学性能,使用PCL-ONO2添加剂.
主要方法:
- 通过乙化和酸盐接种合成酸聚烯酸 (PCL-ONO2).
- 理论计算和X射线光电子光谱 (XPS) 深度分析分析固体电解质介相 (SEI) 膜.
- 用LiFePO4或LiNi0.5Co0.2Mn0.3阴极对Li对称电池和全电池进行电化学测试.
主要成果:
- PCL-ONO2成功地将高度NO3引入碳酸盐电解质中.
- 在立体金属阳极上形成一个稳定的,双层的SEI膜 (含化物丰富的内层,灵活的PCL基外层).
- 在10.0 mAh cm-2和10.0 mA cm-2的Li对称电池中实现了超过1400小时的稳定循环.
- 在带有高负荷阴极和薄金属阳极的全电池中,证明了更好的循环稳定性和速率能力.
结论:
- PCL-ONO2是一种有效的电解质添加剂,用于稳定高压碳酸盐电解质中的金属阳极.
- 构建的双层SEI膜对于增强的电化学性能至关重要.
- 这项工作为开发具有更高安全性和寿命的先进金属电池铺平了道路.
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