Liang Xinghua, Wang Yuying, Liang Zhida, Yan Ge, Lan Lingxiao, Wang Yujiang, Shi Xueli, Yun Shuhong, Huang Meihong
Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science & Technology, Liuzhou 545006, China.
Guangxi Automobile Group Co., Ltd., Liuzhou 545006, China.
Polymers (Basel). 2023 Dec 23;16(1):55. doi: 10.3390/polym16010055.
Lithium-ion solid-state batteries with spinel LiTiO (LTO) electrodes have significant advantages, such as stability, long life, and good multiplication performance. In this work, the LTO electrode was obtained by the atmospheric plasma spraying method, and a composite solid electrolyte was prepared by in situ ultraviolet (UV) curing on the LTO electrode. The composite solid electrolyte was designed using a soft-hard combination strategy, and the electrolyte was prepared into a composite of a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) flexible structure and high-conductivity LiAlTi(PO) (LATP) hard particles. The composite electrolyte exhibited a good ionic conductivity up to 0.35 mS cm at 30 °C and an electrochemical window above 4.0 V. In situ and ex situ electrolytes were assembled into LTO//electrolyte//Li solid-state batteries to investigate their impact on the electrochemical performance of the batteries. As a result, the assembled LiTiO//in situ electrolytes//Li batteries exhibited excellent rate of performance, and their capacity retention rate was 90% at 0.2 mA/cm after 300 cycles. This work provides a new method for the fabrication of novel advanced solid-state electrolytes and electrodes for applications in solid-state batteries.
具有尖晶石型LiTiO（LTO）电极的锂离子固态电池具有显著优势，如稳定性、长寿命和良好的倍率性能。在本工作中，通过大气等离子喷涂法制备了LTO电极，并在LTO电极上通过原位紫外（UV）固化制备了复合固体电解质。采用软硬结合策略设计复合固体电解质，将电解质制备成聚（偏二氟乙烯-共-六氟丙烯）（PVDF-HFP）柔性结构与高电导率LiAlTi(PO)（LATP）硬颗粒的复合材料。该复合电解质在30℃时表现出高达0.35 mS cm的良好离子电导率以及高于4.0 V的电化学窗口。将原位和非原位电解质组装成LTO//电解质//Li固态电池，以研究它们对电池电化学性能的影响。结果，组装的LiTiO//原位电解质//Li电池表现出优异的倍率性能，在0.2 mA/cm下循环300次后其容量保持率为90%。本工作为制备用于固态电池的新型先进固体电解质和电极提供了一种新方法。
