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溶液处理的聚乙烯二化物/纤维素/1+xAlxTi2-xPO4复合体固体电解质,用于提高固态离子电池在室温下电化学性能

Szu-Chi Chao¹, Yen-Shen Kuo¹, Pei-Xuan Chen¹

¹Department of Chemical and Materials Engineering, National Central University, No.300, Zhongda Road, Zhongli District, Taoyuan 320317, Taiwan.

Journal of colloid and interface science

|June 27, 2024

概括

使用PVDF/CA,LiTFSI和LATP填充剂的新复合固态电解质提高了离子电池的安全性和能量密度. 优化的电解质显示出高离子导电性和电化学稳定性,提高了电池的性能.

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:

开发更安全,更节能离子电池对于储能应用至关重要.
固态电解质为液态电解质提供了一个有希望的替代品,解决了安全问题,并使更高的能量密度成为可能.
复合固态电解质 (CSEs) 结合了不同材料的优势,以实现增强的性能.

研究的目的:

开发一种新的复合实态电解质 (CSE),以提高离子电池的性能.
研究成分比对CSE的结构,热和电化学性能的影响.
为了评估离子电池中开发的CSE的电化学性能.

主要方法:

使用简单的溶液造方法合成CSE,使用聚乙烯二化物 (PVDF) /纤维素 (CA) 作为矩阵,二三甲硫化物 (LiTFSI) 作为盐,以及Li_1.3Al_0.3Ti_1.7(PO₄) ₃ (LATP) 作为填充剂.
系统地研究了PVDF/CA比率,LiTFSI和LATP分量的对CSE结晶性,多孔性和稳定性的影响.
用离子导电量测量,电化学窗口测定和用铁酸盐阴极进行电池循环测试来评估电化学性能.

主要成果:

优化的CSE (4P1C-40LT/20F) 显示出高离子导电率为4.9 × 10−4 S cm−1和宽电化学窗口高达5.0 V与Li/Li+相比.
使用CSE的铁酸盐电池在25°C时表现出高放电能力,超过160mAh-1g,性能优于使用常规聚合物电解质的电池.
基于CSE的电池显示出出色的循环稳定性,在200个循环后约有90%的容量保留,并且有望的速率能力,在不同速率下保持80%的容量.

结论:

开发的PVDF/CA/LATP复合物固态电解质有效地提高了离子电池的离子导电性和电化学稳定性.
优化的CSE结构促进Li+迁移通过增加的无形区域和改进的Li+运输路径.
这种复合固态电解质代表了开发更安全,更高性能离子电池的可行策略.

关键词:

纤维素乙酸盐的使用情况复合体固体电解质是一种复合体.在LATPP上,你会发现.聚乙二化物 (Poly (乙二化物))聚合物混合物聚合物混合物固态离子电池是固态离子电池.

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