| Autor: |
Wei Gu, Guoyong Xue, Qingyu Dong, Ruowei Yi, Yayun Mao, Lei Zheng, Haikuo Zhang, Xiulin Fan, Yanbin Shen, Liwei Chen |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
eScience, Vol 2, Iss 5, Pp 486-493 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2667-1417 |
| DOI: |
10.1016/j.esci.2022.05.003 |
| Popis: |
Ni-rich layered oxides are attractive cathode materials for advanced lithium-ion batteries (LIBs) due to their high energy density. However, their large-scale application is seriously hindered by their interfacial instability, especially at a high cut-off potential. Here, we demonstrate that trimethoxyboroxine (TMOBX) is an effective film-forming additive to address the interfacial instability of LiNi0.8Co0.1Mn0.1O2 (NCM811) material at a high cut-off voltage of 4.5 V. We find that TMOBX decomposes before carbonate solvent and forms a thin cathode electrolyte interphase (CEI) layer on the surface of the NCM811 material. This TMOBX-formed CEI significantly suppresses electrolyte decomposition at a high potential and inhibits the dissolution of transition metals from NCM811 during cycling. In addition, electron-deficient borate compounds coordinate with anions (PF6−, F−, etc.) and H2O in the battery, further improving the battery's stability. As a result, adding 1.0 wt% of TMOBX boosts the capacity retention of a Li||NCM811 cell from 68.72% to 86.60% after 200 cycles at 0.5C in the range of 2.8–4.5 V. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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