锂金属电池具有能量密度高的优点, 有望成为下一代可充电 电池. 然而, 其液态电解液泄露的风险及锂枝晶生长造成的短路等 问题阻碍了其应用. 使用凝胶电解质被认为是提高锂金属电池安 全性的有效方法, 但是因锂枝晶生长导致循环寿命差的问题仍未有效解决. 本文设计了一种结合原位聚合和硼酸添加剂双重效果 的凝胶电解质(B-GPE), 并组装了锂金属电池进行测试. 其中, 原位 聚合的方法使得凝胶电解质与电极界面接触良好, 硼酸添加剂一 方面可以增强锂盐的稳定性, 抑制副反应发生; 另一方面可以形成 稳固的SEI膜, 抑制锂枝晶的生长. 以上双重作用使得这种凝胶电解 质应用于锂金属电池可以获得超长循环寿命, 在0.5 C的倍率下循 环950圈仍有87.7%的容量保持率, 是目前类似的凝胶电解质、液 态电解液和固态电解质应用中循环寿命最出色的. 该结果证明结合原位聚合和硼酸添加剂双重效果是制备高性能凝胶电解质的简 单且有效的策略, 并进一步为锂金属电池的广泛应用提供了有价 值的方法.
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The authors gratefully acknowledge the financial support from the Ministry of Science and Technology of China (2016YFA0200200), the National Natural Science Foundation of China (21421001 and 51633002), Tianjin city (16ZXCLGX00100) and 111 Project (B12015).
Experimental details and supporting data are available in the online version of the paper.
Conflict of interest
The authors declare no conflict of interest.
Yu Han is currently a graduate student at Nankai University under the direction of Prof. Yongsheng Chen. She obtained her BSc degree from Lanzhou University in 2017. Her main research interests are focused on gel electrolyte and the related applications in energy storage.
Hongtao Zhang received his PhD degree from the Institute of Chemistry, Chinese Academy of Sciences in 2012. He joined Prof. Yongsheng Chen’s group at Nankai University in 2014. Thereafter, he became an associate professor. His current research interests mainly focus on the synthesis and characterization of organic and polymer functional materials and their application in energy conversion and storage devices.
Yongsheng Chen graduated from the University of Victoria with a PhD degree in chemistry in 1997 and then joined the University of Kentucky and the University of California at Los Angeles for postdoctoral studies from 1997 to 1999. From 2003, he has been a Chair Professor at Nankai University. His main research interests include: i) carbon-based nanomaterials, including carbon nanotubes and graphene; ii) organic and polymeric functional materials, and iii) energy devices including organic photovoltaics and supercapacitors.
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Han, Y., Zhou, Y., Zhu, J. et al. Dual effects from in-situ polymerized gel electrolyte and boric acid for ultra-long cycle-life Li metal batteries. Sci. China Mater. (2020). https://doi.org/10.1007/s40843-020-1359-8