通过溶剂选和界面操纵解锁4.9V近固态金属电池
Bin Qiu1, Feng Xu1, Jie Huang1
1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518060, People's Republic of China.
Nano letters
|July 11, 2024
概括
研究人员通过在阴极上创建渐变间相来稳定固态金属电池 (LMB). 这种方法提高了结构完整性,并提高了高压应用的容量.
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:
- 固态金属电池 (LMB) 的降解主要是由于阴极结构完整性差以及高电位的不稳定接口造成的.
- 现有的LMB在高压条件下难以保持性能,限制了它们的特定能量.
- 开发稳定的接口对于推进高压LMB技术至关重要.
研究的目的:
- 增强高压LMB中的商业LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极的结构完整性和接口兼容性.
- 通过调节的聚合物电解质,研究一种创建渐变固态电解质间相 (SEI) 的新策略.
- 为了证明三甲基酸盐 (TMP) 作为电解质添加剂的有效性,以稳定NCM811阴极-电解质接口.
主要方法:
- 使用中间介电常溶剂调节聚合物电解质的内在结构.
- 通过将三甲基酸盐 (TMP) 化学吸附到NCM811阴极上,诱导渐变固态电解质间相 (SEI).
- 在4.9V的切断电压下运行的NCM811adjLi全电池的电化学测试.
主要成果:
- 在NCM811阴极上成功诱导富含LiPF6O和LiF的梯度间相.
- 调节TMP的聚合物电解质确保了NCM811阴极的结构完整性和接口兼容性,最高可达4.9V.
- 在4.5V和4.9V之间运行时,NCM811的特定容量增加了27.7%.
结论:
- 拟议的调节电解质溶剂和操纵电极接口的方法对于稳定高压LMBs是有效的.
- 这一战略为开发具有显著更高特定能量的准固态LMB开辟了新的可能性.
- 这些发现为电解质溶剂选和先进电池系统的相间工程提供了一种通用方法.
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