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超薄聚合物电解质具有快速离子传输和稳定的接口,用于实用的固态金属电池

Shuixin Xia^1,2, Xiangfeng Zhang¹, Zongyan Jiang¹

¹School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, China.

Advanced materials (Deerfield Beach, Fla.)

|June 27, 2025

概括

研究人员开发了一种超薄固体聚合物电解质 (SPE),用于更安全,更高能量的金属电池 (LMB). 这种新型电解质具有出色的离子导电性,并有效抑制树的生长,为先进的电池技术铺平了道路.

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:

超薄固体聚合物电解质 (SPEs) 对于开发高能量密度和安全的金属电池 (LMB) 至关重要,为液体电解质提供了替代品.
在SPE开发中的关键挑战包括实现高离子导电性和有效抑制树生长.

研究的目的:

为高性能超薄SPEs提出一个可扩展的制造方法.
为了增强SPEs的离子导电性和树阻特性,用于高级LMBs.

主要方法:

基于聚碳酸的超薄 (≈7.8μm) 电解质 (UPCE) 的制造,使用由相分离衍生的聚乙烯化物-co-hexafluoropropylene (PVH) 的多孔支架.
使用1--4-(1-甲基乙) (FMB) 进行电解质结构工程,以修改Li+溶解并促进富含LiF的固体电解质间相 (SEI).
在Li-金属对称细胞,LiLiCoO2细胞和袋细胞中描述离子导电性,临界电流密度和循环性能.

主要成果:

设计的UPCE具有4.8 × 10−4 S cm−1的高离子导电率和在25°C时11.5 mA cm−2的超高临界电流密度.
固态Li对称细胞在0.5mA cm-2.2时实现了超过6000小时的超长循环.
液体LiCoO2电池在4.5V的1500个周期中表现出稳定的循环,袋式电池达到495Wh kg-1.1的高能量密度.

结论:

通过可扩展方法制造的UPCE解决了超薄SPEs中离子导电性和树抑制的关键挑战.
这项工作为高能固态LMBs的商业化提供了一个有前途的途径.

关键词:

高临界电流密度的高临界电流密度.长周期固态金属电池长周期固态金属电池固体聚合物电解质的电解质超薄的超薄的

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