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基于石榴石的高性能全固态电池的富含的接口

Shruti Suriyakumar¹, Indu M Santhakumari¹, Souvik Ghosh^1,2

¹School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India shruti@iisertvm.ac.in shaiju@iisertvm.ac.in.

Chemical science

|April 10, 2025

概括

本研究介绍了固态电池中复合聚合物电解质 (CPE) 的富含的新型接口,提高了安全性和能量密度. 改进的CPE显示出电池的优越离子导电性和长期循环稳定性.

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:

固态电池比传统的离子电池提供更高的安全性和能量密度.
复合聚合物电解质 (CPE) 结合了聚合物和陶电解质的优势,但在高陶负载下面临界面挑战.
现有的CPE因聚合物填充剂接口问题而遭受性能恶化,当陶含量超过20%时.

研究的目的:

开发一种有效的策略,以提高固态电池的复合聚合物电解质 (CPE) 的性能.
解决CPE在高陶负载 (>20%) 的聚合物填充剂接口限制.
为了提高固态电池的安全性,离子导电性和循环稳定性.

主要方法:

合理设计的复合聚合物电解质 (CPE) 的制造,使用40%的陶负载.
在阳极,陶填充剂和CPE之间引入一种现场形成的富含的接口.
电化学表征,包括离子导电性测量和离子对称细胞循环.
全固态Li//LFP全电池的制造和测试.
对在导电性增强中的作用进行计算验证.

主要成果:

使用40%陶加载开发的CPE实现了高离子导电性 (10−4 S cm−1 @ 55 °C).
二甲对称电池表现出令人印象深刻的循环稳定性,在0.1 mA cm-2.2时超过2000个循环.
全固态Li//LFP全电池在0.1C和70°C下提供了140mAhg-1的放电容量,并且具有良好的循环稳定性.
富含的接口显著提高了导电性和循环性能,这是通过计算证实的.

结论:

使用在现场形成的富含接口的高效策略克服了高陶载荷CPE中的聚合物填充器接口问题.
优化的CPE可实现高离子导电性,在对称细胞中具有出色的循环稳定性,在完整细胞中具有强大的性能.
这种方法大大促进了更安全,更高能量密度的固态电池的开发.

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