用于高能量密度准固态离子电池的共互锁电极-电解质接口
Dong-Yeob Han1, Im Kyung Han2, Jin Yong Kwon3
1Department of Chemistry and Department of Battery Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 16, 2025
概括
一个新的互锁电极-电解质系统提高了准固态电池的安全性和性能. 这一创新确保了像阳极这样的高容量材料的稳定接口,提高了能量密度和循环寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 准固态电池 (QSSB) 与传统电池相比,提供了更好的安全性和性能.
- 高容量材料,如微粒 (SiMP) 和丰富的阴极 (NCM811),由于循环过程中的体积波动,在QSSB中面临界面不稳定性和接触损失.
- 现有的QSSB配置难以保持稳定的电极-电解质接触,限制了它们的实际应用.
研究的目的:
- 为QSSBs开发一个现场互锁电极电解质 (IEE) 系统.
- 解决使用高体积波动活性材料的QSSB的界面不稳定性和接触损失问题.
- 提高QSSB的电化学性能,安全性和能量密度.
主要方法:
- 一个现场互锁电极-电解质 (IEE) 系统是使用活性材料上的烯酸功能化结合剂和准固态电解质 (QSSE) 中的交叉结合剂之间的共价交叉连接设计的.
- 通过电化学循环评估IEE系统的稳定性,测试了SiMP下载的NCM811完整电池,监测电压歇斯底里,界面电阻和空隙形成.
- 使用压力检测电池套件来评估循环期间的压力变化和电压稳定性,并在双层袋式电池上进行了机械滥用测试 (折叠,切割).
主要成果:
- 该IEE系统成功建立了一个强大的,相互连接的网络,保持稳定的电极-电解质接触,并防止在200个周期内形成空隙.
- 观察到低压歇斯底里和稳定的界面电阻,表明与传统QSSB配置相比,电化学稳定性优越.
- 带有IEE系统的SiMP下载器下载NCM811全电池实现了403.7Wh kg-1/1300Wh L-1的高能量密度,并在机械滥用测试中证明了弹性.
结论:
- 在现场互锁的电极-电解质系统有效地克服了高能量密度QSSB与体积波动材料的接口挑战.
- 这种方法显著提高了电池的安全性,循环寿命和能量密度,为先进的QSSB技术铺平了道路.
- 开发的IEE系统为实现实用,高性能准固态电池提供了一个有前途的战略.
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