Lan Tu, Zhou Jinxia, Xie Tianzheng, Huang Kai, Ong Suichang, Yang Huili, Jiang Heng, Zeng Yibo, Zhang Han, Guo Xuanrui, Wan Linyi, Zhang Ying, Guo Hang
Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, 361005 Xiamen, People's Republic of China.
Xiamen University Malaysia, 43900 Sepang, Selangor Darul Ehsan, Malaysia.
J Colloid Interface Sci. 2024 Dec 15;676:1-12. doi: 10.1016/j.jcis.2024.07.007. Epub 2024 Jul 10.
Spinel LiTiO (LTO), a zero-strain material, is a promising anode material for solid-state thin-film lithium-ion batteries (TFB). However, the preparation of high-performance LiTiO thin-film electrodes through facile methods remains a significant challenge. Herein, we present a novel approach to prepare a binder- and conductor-free porous LiTiO (P-LTO) thin-film. This approach polyvinyl alcohol (PVA)-assisted spray deposition and does not require the use of complex or expensive methods. Adding PVA to the precursor solution effectively prevents thin-film cracking during high-temperature annealing, enhances adhesion, and forms a highly interconnected porous structure. This unique structure shortens the lithium-ion diffusion pathways and facilitates electron transport. Therefore, P-LTO thin film electrodes demonstrate exceptional rate capacity of 104.1 mAh/g at a current density of 100C. In addition, the electrodes exhibit ultra-long cycle stability, retaining 80.9 % capacity after 10,000 cycles at 10C. This work offers a novel approach for the preparation of high-performance thin-film electrodes for TFBs.
尖晶石LiTiO（LTO）是一种零应变材料，是固态薄膜锂离子电池（TFB）中一种很有前景的负极材料。然而，通过简便方法制备高性能LiTiO薄膜电极仍然是一项重大挑战。在此，我们提出了一种制备无粘结剂和无导体的多孔LiTiO（P-LTO）薄膜的新方法。这种方法是聚乙烯醇（PVA）辅助喷雾沉积，不需要使用复杂或昂贵的方法。向前驱体溶液中添加PVA可有效防止高温退火过程中薄膜开裂，增强附着力，并形成高度互连的多孔结构。这种独特的结构缩短了锂离子扩散路径并促进电子传输。因此，P-LTO薄膜电极在100C的电流密度下表现出104.1 mAh/g的优异倍率容量。此外，该电极表现出超长的循环稳定性，在10C下循环10000次后仍保留80.9%的容量。这项工作为TFB制备高性能薄膜电极提供了一种新方法。
