https://scholars.lib.ntu.edu.tw/handle/123456789/634295
標題: | A Comparative Study of Polycrystal/Single-Crystal LiNi0.8Co0.1Mn0.1O2 in All-Solid-State Li-Ion Batteries with Halide-Based Electrolyte under Low Stacking Pressure | 作者: | Liu, Hao Wen Parthasarathi, Senthil Kumar Thi, Shiki Weng, Yu Ting Bolloju, Satish CHIA-CHIN CHEN RU-JONG JENG NAE-LIH WU |
關鍵字: | all-solid-state lithium-ion batteries | debonding | microcracking | single-crystal/polycrystal NCM | stacking pressure | 公開日期: | 1-四月-2023 | 卷: | 11 | 期: | 4 | 來源出版物: | Energy Technology | 摘要: | Composite cathodes consisting of a LiNi0.8Co0.1Mn0.1O2 (NCM) cathode and brittle Li3InCl6 (LIC) solid-state electrolyte (SSE) are assessed for all-solid-state Li-ion battery (ASSLIB) applications under a low stacking pressure (coin-cell configuration: ≈2.0 MPa). Herein, an investigation is conducted to understand how the internal particle morphologies of the polycrystal (PC-)/single-crystal (SC-) NCM cathode materials affect the internal cracking within the composite electrodes and thereby electrode performance. Extensive debonding between NCM and LIC takes place even at a very low current density (0.03C) with high voltage (4.4 V), but substantially narrower/shorter debonding gaps are observed for SC-NCM as compared with PC-NCM (wider/lengthier) due to their different particle sizes. High current rates (e.g., 0.1C) bring about greater strain rates in PC-NCM particles, resulting in widespread microcracking along the grain boundaries between primary particles and consequently creating “dead zones” that are isolated from the ionic and electronic conduction pathways. Although SC-NCM shows microcracking within the agglomerates, individual NCM crystals remain in close contact with the SSEs because of noticeably fewer grains in the agglomerations than in the PC-NCM secondary particles. A low-pressure SC-NCM ASSLIB is demonstrated with good cycle stability comparable with that of a liquid-electrolyte cell even under stressful currents. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/634295 | ISSN: | 21944288 | DOI: | 10.1002/ente.202201439 |
顯示於: | 化學工程學系 |
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