用于室温高性能离子电池的聚合物离子相互作用促成的准固体电解质
Fangzheng Liu1,2, Jiayi Wang1, Wenyan Chen2
1Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China.
Advanced materials (Deerfield Beach, Fla.)
|September 13, 2024
概括
一种新型的准固体凝电解质 (QSE) 防止石墨脱皮,提高离子电池的性能和安全性. 这一突破解决了关键的局限性,为商业化更安全,高能量密度的电池铺平了道路.
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:
- 准固体凝电解质 (QSE) 为离子电池提供了增强的安全性.
- 商业化受到低离子导电性和差的接口接触的限制.
- 在石墨阳极中溶剂的协同插入会导致脱皮,降低电池性能.
研究的目的:
- 开发一种超越当前离子电池电解质的QSE.
- 研究QSE中防止石墨剥落的机制.
- 评估高能量密度电池中QSE的性能和安全性.
主要方法:
- 在位聚合甲基甲酸盐 (MMA) 在基于1,2-二甲基乙 (DME) 的电解质中以形成QSE.
- 使用开发的QSE,制造和测试高负荷石墨底干燥LiNi0.8Co0.1Mn0.1O2 (NCM811) 袋式电池.
- 电化学性能评估,包括C-rate能力,循环寿命和安全测试.
- 与液碳酸盐电解质电池和其他高能量密度电池系统进行比较分析.
主要成果:
- 由于其独特的缺乏溶剂的溶解结构,QSE成功地禁止了石墨脱皮.
- 在高阴极质量负载 (17.5毫克/厘米-2) 时,石墨硫酸硫NCM811袋式电池表现出优越的C率能力,性能优于液体电解质电池.
- 基于碳酸盐的优化QSEs显示出极好的循环寿命 (在1700个循环后保持92.4%的容量) 和可靠的安全性.
- 在具有显著体积变化的高能量密度电池中,QSE技术被证明是有效的.
结论:
- 开发的QSE有效地防止石墨脱皮,这是离子电池的一个关键问题.
- QSE提供了增强的离子导电性和接口接触,从而带来了卓越的电化学性能.
- 这项研究强调了聚合物在QSE中的关键作用,为推进准固态电池商业化提供了见解.
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