Designing core-shell LiNi0.5Mn1.5O4-based cathode materials with enhanced rate capability and improved cycling stability
學年 113
學期 1
出版（發表）日期 2024-11-23
作品名稱 Designing core-shell LiNi0.5Mn1.5O4-based cathode materials with enhanced rate capability and improved cycling stability
作品名稱（其他語言）
著者 Yu-Sheng Hsiao; Jen-Hsien Huang; Shih-An Liu; Jui-Hsiung Huang; Lin-Yang Weng; Sheng-Wei Liao; Chih-Wei Hu; Wei Kong Pang; Shih-Chieh Hsu; Huei Chu Weng; Yu-Ching Huang
單位
出版者
著錄名稱、卷期、頁數 Applied Surface Science 684, 161892
摘要 The physical and electrochemical properties of the LiNi0.5Mn1.5O4 (LNMO) cathodes are found to depend significantly on the content of ordered (P4332) and disordered (Fd3m) structure, which can be adjusted by altering the synthesis conditions. Disordered LNMO is believed to exhibit better rate performance than the ordered form due to the presence of Mn3+ ions, which enhance conductivity. Unfortunately, the presence of Mn3+ ions can negatively impact cycling stability, as Mn3+ ions are easily disproportionate to Mn2+/Mn4+ ions, leading to Mn dissolution. In this study, we synthesized a series of LiNixMn2-xO4 (x = 0.3, 0.4, 0.5, 0.6, and 0.7) to tailor the Ni/Mn disordered structure degree. The results indicate that increasing the Mn molar ratio (lower x value) raises the degree of Ni/Mn disorder in the structure, and vice versa. To combine the advantages of both ordered (high stability) and disordered (high rate) phases, we fabricated a core–shell spinel cathode, where the disordered component is encapsulated by an ordered shell serving as a stable protective layer. The core–shell composite demonstrates a high specific capacity of 126.7 mAh/g at 0.2C, with excellent rate performance (108.3 mAh/g at 10C) and outstanding cycling stability, retaining 84.6 % of its capacity at 4C after 200 cycles.
關鍵字
語言 en_US
ISSN 1873-5584; 0169-4332
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 NLD
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/127650 )