符合标准的固体聚合物电解质 (SPEs) 提高了全固态金属电池 (LMB) 中的阳极-电解质接口稳定性
William R Fullerton1, Christopher Y Li1
1Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
ACS applied polymer materials
|July 18, 2024
概括
研究人员为金属电池 (LMB) 开发了新的固体聚合物电解质 (SPE). 添加自由悬挂的链条通过提高稳定性和循环寿命来提高电池性能,克服了以前的限制.
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:
- 金属电池 (LMB) 提供高能量密度,但面临着岩形成和不稳定的电沉积的挑战.
- 固体聚合物电解质 (SPEs) 可以减轻树突的生长,但优化稳定的金属阳极的网络结构仍然很困难.
研究的目的:
- 设计和研究基于交叉连接器的新型链网络SPE,具有可调节的合规性.
- 通过修改的SPE架构来增强LMB中的阳极-电解质接口接触和稳定的电沉积行为.
主要方法:
- 合成网络 SPEs 结合了自由悬挂的链条来调整离子导电性,延展性和合规性.
- 在不同的循环条件下,评估了 LiidiyeSPE和 LiidiyeFePO4 半细胞中的 SPE性能.
主要成果:
- 增加了SPE网络的合规性和延展性,改善了阳极-电解质接口粘附性和降低了电压歇斯底里.
- 具有56.3%重量自由悬挂链的SPEs在对称细胞中实现了93.4%的库伦比效率和1.9倍更长的循环寿命.
- 半细胞循环显示,在1C的275个循环后,界面阻力增长减少,92.8%的容量保持.
结论:
- 将自由悬挂链引入网络 SPEs 是提高金属阳极性能的有效策略.
- 可调节的SPE合规性和柔性对于稳定的金属电池运行和延长周期寿命至关重要.
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