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Dual-interface reinforced flexible solid garnet batteries enabled by in-situ solidified gel polymer electrolytes
Nano Energy ( IF 17.6 ) Pub Date : 2021-09-11 , DOI: 10.1016/j.nanoen.2021.106498
Zhijie Bi 1 , Weilin Huang 1 , Shuang Mu 1 , Wuhui Sun 1 , Ning Zhao 1 , Xiangxin Guo 1
Affiliation  

The garnet-type Li7La3Zr2O12 (LLZO) is deemed as the promising solid electrolyte for solid lithium batteries due to its high stability and ionic conductivity. However, the rigid and brittle natures of LLZO lead to severe interfacial issues from both the cathode and the Li-metal anode sides, as well as limited applications in flexible electronics. In this work, the in-situ solidified gel polymer electrolytes (GPEs) are constructed as not only the interlayer to buffer electrode/garnet interfaces, but also the adhesive to join garnet blocks together, realizing the scale expansion and good flexibility of solid garnet batteries. For interface engineering, such GPE is conformally solidified at electrode/garnet interfaces, along with the cathode particles fully surrounded by solidified electrolytes. On anode sides, the Li/garnet interfacial resistance notably drops to 88 Ω cm2, accompanied by the symmetric cell stably cycling over 400 h with robust solid electrolyte interphases. On cathode sides, the cross-linked ion-conducting network is formed inside the cathode, and the intimate contact is built at cathode/garnet interface, arousing remarkable cycling and rate performance for LiFe0.2Mn0.8PO4/Li and LiFePO4/Li cells at 30 °C. Furthermore, the soft GPE can be used as adhesive to connect garnet blocks together without gaps, enabling the construction of flexible and large-scale solid batteries, in which the GPE functions as deformable medium to induce the bending and coiling of solid batteries. This work demonstrates a promising strategy to address both the rigidity and brittleness issues of garnets by utilizing the in-situ solidified multifunctional GPEs.



中文翻译:

由原位固化凝胶聚合物电解质实现的双界面增强柔性固体石榴石电池

石榴石型 Li 7 La 3 Zr 2 O 12(LLZO)由于其高稳定性和离子导电性而被认为是有前途的固体锂电池固体电解质。然而,LLZO 的刚性和脆性导致正极和锂金属负极的严重界面问题,以及在柔性电子产品中的有限应用。在这项工作中,原位固化凝胶聚合物电解质(GPEs)不仅是缓冲电极/石榴石界面的夹层,而且是将石榴石块连接在一起的粘合剂,实现了固体石榴石电池的规模扩展和良好的柔韧性. 对于界面工程,这种 GPE 在电极/石榴石界面处共形固化,阴极颗粒完全被固化电解质包围。在阳极侧,锂/石榴石界面电阻显着下降至 88 Ω cm如图 2 所示,伴随着对称电池稳定循环超过 400 小时,具有坚固的固体电解质界面。在阴极侧,在阴极内部形成交联的离子导电网络,在阴极/石榴石界面建立紧密接触,激发了 LiFe 0.2 Mn 0.8 PO 4 /Li 和 LiFePO 4显着的循环和倍率性能/Li 电池在 30 °C。此外,软质 GPE 可用作粘合剂,将石榴石块无间隙地连接在一起,从而能够构建柔性和大规模的固体电池,其中 GPE 作为可变形介质来诱导固体电池的弯曲和卷曲。这项工作展示了一种有前景的策略,通过利用原位固化的多功能 GPE 解决石榴石的刚性和脆性问题。

更新日期:2021-09-17
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