固体聚合物电解质具有牺牲性终端组,用于金属电池中的广泛氧化潜力和稳定接口
Ashish Raj1, Satyannarayana Panchireddy1, Lieven Bekaert2,3
1Institute of Condensed Matter and Nanoscience (IMCN), UCLouvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium.
ACS applied materials & interfaces
|August 30, 2024
概括
在聚乙烯糖醇 (PEG) 电解质上修改终端组显著提高了电池的性能. 新的碳酸基功能组作为牺牲剂,保护PEG链并提高稳定性.
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:
- 聚乙烯甘醇 (PEG) 是电池的广泛研究的聚合物电解质.
- PEG存在限制其性能的缺点,需要对其低性能进行基础研究.
- 接口降解和有限的电化学稳定性是基于PEG的电解质的主要挑战.
研究的目的:
- 为了研究终端组对三臂PEG恒星电解质的影响.
- 合成和评估具有基 (TPEG-OH) 与碳酸 (TPEG-Carb-ket) 终端组的PEG.
- 了解终端组修改如何影响电池的界面稳定性和电化学性能.
主要方法:
- 通过环开反应合成三臂PEG星与基和碳酸基末端组.
- 电化学评估包括循环稳定性,库伦比效率和电化学稳定性窗口.
- 金属阳极和LiFePO4阴极的长期循环测试.
- 用密度函数理论 (DFT) 和初始分子动力学 (AIMD) 模拟来支持实验结果.
主要成果:
- 碳酸末端组作为牺牲剂,保护PEG脊柱.
- TPEG-Carb-ket电解质表现出减少的界面降解和更广泛的电化学稳定性窗口 (高达4.47V).
- 与TPEG-OH (5.03 mAh g-1) 相比,含有TPEG-Carb-ket的电解质显示出更好的容量保留 (113.8 mAh g-1在100个循环后).
- 稳定的金属接口证明了超过1200小时的剥离和接.
结论:
- 终端组修改是一种可行的策略,可以增强基于PEG的聚合物电解质.
- 碳酸功能有效地保护电解质,并提高电池的性能.
- 这种方法为先进的电池提供了更稳定,更高效的聚合物电解质的途径.
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