Solvent-free synthesis of PEO/garnet composite electrolyte for high-safety all-solid-state lithium batteries
Solvent-free synthesis of PEO/garnet composite electrolyte for high-safety all-solid-state lithium batteries
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无溶剂合成高安全性全固态锂电池PEO/石榴石复合电解质
DOI：
10.1016/j.jallcom.2020.157915
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发表时间：
2020-11
影响因子：
6.2
通讯作者：
Zhao Bing
中科院分区：
文献类型：
--
作者：
Zhuang Hua;Ma Wencheng;Xie Jingwei;Liu Xiaoyu;Li Bobo;Jiang Yong;Huang Shoushuang;Chen Zhiwen;Zhao Bing
固体电解质膜在全固态电池的应用中起着至关重要的作用。本文采用无溶剂热轧法制备了工业用亚微米Li6.75La3Zr1.75Ta0.25O12(LLZTO)复合电解质膜。结果表明，在PEO-LiTFSI基电解液中加入LLZTO可以有效降低PEO的结晶度，改善复合固体电解质膜的离子导电性、电压窗口、力学性能和界面稳定性。最佳LLZTO含量为10wt%的复合电解质膜在55℃时的最大离子电导率为3.03×10−4S/cm−1，最大断裂伸长率为74.8%。用10wt%LLZTO膜组装的锂对称电池具有最低的极化电压和最佳的循环性能，这可以归因于膜的力学性能的提高以及膜与金属锂之间较低且稳定的界面电阻。全固态LiFePO4/Li电池在55℃下以0.1C的倍率提供了155.8 mAhg−1的高比容量，并表现出优异的循环性能和倍率性能。此外，由PEO-LiTFSI-10LLZTO复合电解质膜组装的袋式电池在切割等恶劣条件下仍能保持3.39伏的原始电压并为发光二极管(LED)供电，表现出优异的安全性能。
Solid electrolyte membrane plays a vital role in the application of all-solid-state batteries. In this paper, composite electrolyte membranes incorporating commercial submicron Li6.75La3Zr1.75Ta0.25O12(LLZTO) are prepared by solvent-free hot rolling method. It is found that the addition of LLZTO to the PEO-LiTFSI-based electrolyte can effectively reduce the crystallinity of PEO, improve the ion conductivity, voltage window, mechanical properties and interfacial stability of the composite solid electrolyte membrane. The composite electrolyte membrane with the optimal LLZTO content of 10 wt% exhibits a maximum ionic conductivity of 3.03 × 10−4S cm−1at 55 °C and a maximum elongation break of 74.8%. And also, the lithium symmetric cell assembled with 10 wt% LLZTO membrane exhibits the lowest polarization voltage and the best cycle performance, which can be attributed to the enhanced mechanical properties of the membrane and the lower and stable interfacial resistance between the membrane and lithium metal. The all-solid-state LiFePO4/Li batterie delivers a high specific capacity of 155.8 mAh g−1at 0.1C rate at 55 °C, and exhibits excellent cycle performance and rate performance. In addition, the pouch cells assembled with PEO-LiTFSI-10LLZTO composite electrolyte membrane can still maintain the pristine voltage of 3.39 V and power light-emitting diodes (LEDs) under harsh conditions such as cutting, showing an excellent safety performance.
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影响因子：
4.6
作者：
Porcarelli L;Gerbaldi C;Bella F;Nair JR
通讯作者：
Nair JR
影响因子：
3.9
作者：
L. Persi;F. Croce;B. Scrosati;E. Plichta;M. Hendrickson
通讯作者：
L. Persi;F. Croce;B. Scrosati;E. Plichta;M. Hendrickson
影响因子：
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通讯作者：
Wenping Zha;Fei Chen;Dunjie Yang;Q. Shen;Lianmeng Zhang
影响因子：
3.9
作者：
Falco, Marisa;Simari, Cataldo;Gerbaldi, Claudio
通讯作者：
Gerbaldi, Claudio
影响因子：
9.4
作者：
Piana, Giulia;Bella, Federico;Gerbaldi, Claudio
通讯作者：
Gerbaldi, Claudio