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Peiying Li¹, Jinjin Hao¹, Shuang He¹

¹Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China.

Nature communications

|April 19, 2025

概括

研究人员开发了无以太烯酸准固态电解质 (QSSE) 用于稳定,高压固态电池. 低温聚合物结晶通过重新水接口来非破坏性地延长电池寿命.

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:

基于聚合物的准固态电解质 (QSSE) 对固态电池具有前景,但在离子导电性和电化学稳定性方面面临挑战.
现有的QSSEs通常含有以太单元,限制它们与高压阴极材料的兼容性.

研究的目的:

为高压固态电池合成基于乙烯酸的新型QSSEs.
研究聚合物溶解结构对离子导电性的作用.
开发一种非破坏性的方法来延长电池寿命.

主要方法:

合成无以太烯酸聚合物与Li + - 连接体.
聚合度和抗氧化能力的表征.
使用高压正极电极进行电化学测试 (例如,LiNi0.85Co0.075Mn0.075O2,4.6V LiCoO2,4.8V Li1.13Ni0.3Mn0.57O2).
研究低温 (-50°C) 聚合物结晶对电池性能的影响.

主要成果:

达到99%的聚合度,没有残留的单体,确保高抗氧化和与高压阴极的兼容性.
证明了聚合物溶解结构对离子导电性至关重要.
确定了低温结晶作为释放受限液体,重新湿接口和恢复容量的方法.
成功地延长了电池的寿命,没有破坏性.

结论:

无以太烯酸盐QSSEs为高压固态电池提供了可行的途径.
控制聚合物溶解结构和利用低温结晶是提高性能和寿命的关键策略.
开发的方法提供了一种非破坏性的方法来复苏固态电池.

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