从聚合物细分放松和高离子导电性中脱离离子运输,以聚乙烯氧化物/糖尼铁复合物为基础的电解质具有低盐 doping
J Mor1,2, S K Sharma1,2
1Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. skumars@barc.gov.in.
Physical chemistry chemical physics : PCCP
|April 19, 2024
概括
研究人员通过在聚合物电解质中添加succinonitrile到poly (?? 乙烯氧化物) 中增强了离子导电性. 这项创新将离子运输与聚合物放松脱,为更好的固态电池铺平了道路.
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
- 聚合物科学 聚合物科学
背景情况:
- 聚乙烯氧化物 (PEO) 电解质由于合离子运输和细分松,具有有限的离子导电性.
- 开发高效的固态电解质对于先进的离子电池至关重要.
研究的目的:
- 为了增强基于PEO的电解质的离子导电性.
- 为了研究离子运输与聚合物细分松的脱.
- 探索用于离子电池的PEO-SN复合电解质的潜力.
主要方法:
- 制备具有低LiTFSI负载的PEO-succinonitrile (SN) 复合电解质.
- 在各种温度下测量离子导电性.
- 阳子灭绝寿命光谱 (PALS) 用于研究离子运输通道.
- 宽带介电谱学 (BDS) 使用拉特纳的方法来分析放松动态.
主要成果:
- 在 313 K 达到 1.07 × 10−3 S cm−1 的离子导电性,在 298 K 达到 6.20 × 10−4 S cm−1 的离子导电性.
- 通过离子运输通道证明了更快的离子运输 (扩散系数,D = 3.63 × 10−5 cm−2 s−1)
- 确认了离子运输与PEO细分放松的显著脱.
结论:
- 添加苏奇尼尼特有效地提高了以PEO为基础的电解质中的离子导电性.
- 从细分放松观察到的离子运输脱是提高电解质性能的关键.
- PEO-SN复合电解质为开发用于离子电池的廉价,全固态聚合物电解质提供了一个有前途的途径.
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