用聚合物化学粘合无机填充剂以获得超稳定的固态电池
Xuemin Yin1, Wuliang Feng2, Shuling Cheng3
1College of Sciences & Institute for Sustainable Energy, Shanghai University, Shanghai 200444, China; Hebei Key Laboratory of Green Development of Rock and Mineral Materials, Hebei GEO University, Shijiazhuang 050031, China.
Journal of colloid and interface science
|June 16, 2023
概括
这项研究开发了一种新的复合固体电解质 (CSE),通过在现场将二氧化 (SiO2) 颗粒固定在聚乙烯氧化物 (PEO) 中,用于固态电池. 改进的接口兼容性增强了离子导电性和电化学稳定性,使电池的性能能够持续很长时间.
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:
- 复合固体电解质 (CSEs) 提供机械稳定性,但缺乏无机/有机接口兼容性,限制了它们在固态电池中的使用.
- 这种接口问题阻碍了离子导电性和电化学稳定性,阻止了CSEs的广泛采用.
研究的目的:
- 开发一种具有增强的界面兼容性和改善的离子导电性的无机/有机CSE.
- 通过在无机填充剂和聚合物矩阵之间创建稳定的接口来解决传统CSE的局限性.
- 为了证明这种新型CSE在高性能固态电池中的潜力.
主要方法:
- 在一个聚乙烯氧化物 (PEO) 矩阵内固定 (SiO2) 颗粒以形成均的无机/有机CSEs (I-PEO-SiO2).
- 合成的CSEs的界面特性,离子导电性和电化学稳定性的表征.
- 制造和测试一个Na3V2(PO4)3 ‖ I-PEO-SiO2 ‖ Na全电池,以评估电池性能.
主要成果:
- 在现场的方法在SiO2颗粒和PEO链之间产生了强大的化学键,与现场的方法相比,显著改善了接口兼容性.
- I-PEO-SiO2 电解质表现出增强的 Na+ 导电性 (2.3 × 10-4 S cm-1 在 60 °C) 和更高的 Na+ 转移数 (0.46).
- 全细胞表现出优异的树突抑制,高特异容量 (90.5mAhg-1在3C),以及超长周期稳定性 (>4000周期在1C).
结论:
- 无机填充剂通过现场固定的均分布有效地解决了CSEs的界面兼容性问题.
- 开发的I-PEO-SiO2电解质显示出对高性能和稳定的固态电池具有有希望的性能.
- 这种方法为设计下一代储能设备的先进CSE提供了可行的策略.
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