Song Young-Woong, Heo Kookjin, Lee Jongkwan, Hwang Dahee, Kim Min-Young, Kim Su-Jin, Kim Jaekook, Lim Jinsub
Korea Institute of Industrial Technology (KITECH) 6, Cheomdan-gwagiro 208-gil Buk-gu Gwangju 61012 Republic of Korea
Department of Materials Science and Engineering, Chonnam National University 300 Yongbongdong Bukgu Gwangju 61186 Republic of Korea.
RSC Adv. 2021 Sep 27;11(51):31855-31864. doi: 10.1039/d1ra06210g.
In this study, we evaluated the properties exhibited by a composite solid electrolyte (CSE) prepared tailoring the particle size of an active filler, LiLaZrTaO (LLZTO). The average particle size was reduced to 2.53 μm ball milling and exhibited a specific surface area of 3.013 m g. Various CSEs were prepared by combining PEO and LLZTO/BM-LLZTO. The calculated lithium ionic conductivity of the BM-LLZTO CSE was 6.0 × 10 S cm, which was higher than that exhibited by the LLZTO CSE (4.6 × 10 S cm). This result was confirmed Li nuclear magnetic resonance (NMR) analysis, during which lithium-ion transport pathways varied as a function of the particle size. NMR analysis showed that when BM-LLZTO was used, the migration of Li ions through the interface occurred at a fast rate owing to the small size of the constituent particles. During the Li/CSEs/Li symmetric cell experiment, the BM-LLZTO CSE exhibited lower overvoltage characteristics than the LLZTO CSE. A comparison of the characteristics exhibited by the LFP/CSEs/Li cells confirmed that the cells using BM-LLZTO exhibited high discharge capacity, rate performance, and cycling stability irrespective of the CSE thickness.
在本研究中，我们评估了通过调整活性填料LiLaZrTaO（LLZTO）的粒径制备的复合固体电解质（CSE）所展现的性能。通过球磨将平均粒径减小至2.53μm，其比表面积为3.013 m²/g。通过将PEO与LLZTO/BM - LLZTO相结合制备了各种CSE。BM - LLZTO CSE的计算锂离子电导率为6.0×10⁻⁵ S/cm，高于LLZTO CSE所展现的电导率（4.6×10⁻⁵ S/cm）。这一结果通过锂核磁共振（NMR）分析得到证实，在此分析过程中，锂离子传输路径随粒径变化。NMR分析表明，当使用BM - LLZTO时，由于组成颗粒尺寸小，锂离子通过界面的迁移速率很快。在Li/CSEs/Li对称电池实验中，BM - LLZTO CSE展现出比LLZTO CSE更低的过电压特性。对LFP/CSEs/Li电池所展现特性的比较证实，使用BM - LLZTO的电池无论CSE厚度如何，均表现出高放电容量、倍率性能和循环稳定性。
