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| 題名: | Unveiling the Evolution of LiCoO2 beyond 4.6 V |
| 作者: | Wu, Zixin;Zeng, Guifan;Yin, Jianhua;Chiang, Chao-Lung;Zhang, Qinghua;Zhang, Baodan;Chen, Jianken;Yan, Yawen;Tang, Yonglin;Zhang, Haitang;Zhou, Shiyuan;Wang, Qingsong;Kuai, Xiaoxiao;Lin, Yan-Gu;Gu, Lin;Qiao, Yu;Sun, Shi-Gang |
| 關鍵詞: | Chemical structure;Electrodes;Electrolytes;Oxygen;Phase transitions |
| 日期: | 2023/10/23 |
| 上傳時間: | 2025-09-17 12:06:16 (UTC+8) |
| 出版者: | ACS Publications |
| 摘要: | The working mechanism of LiCoO2 beyond 4.6 V presents complicated issues: (1) the ambiguous multistructural evolutions, (2) the vague O-related anionic redox reactions (ARR) triggered by the overlap Co–O bands, and (3) the serious electrode–electrolyte interface stability challenges. The intricate relationship among them turns into a classic “chicken and egg” conundrum, leading to a confusing evolution process of LiCoO2. Herein, from an ingenious perspective combining stacking faults and nonhomogeneous delithiation, we originally demonstrate a series of intergrowth phase evolutions from O3 to O1, passing through the so-called H1-3 phase. Moreover, in sharp contrast to the O–O dimer formed in a traditional Li-rich layered cathode, a moderate and stable arrangement of oxidized lattice oxygen is unveiled as a manifestation of ARR in LiCoO2. Additionally, we clarify the nature that dehydrogenation and hydrolysis of electrolyte trigger the chain decompositions and intensify the surface degradation. |
| 關聯: | ACS Energy Letters 8(11), 4806-4817 |
| DOI: | 10.1021/acsenergylett.3c01954 |
| 顯示於類別: | [化學工程與材料工程學系暨研究所] 期刊論文
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