Enhanced Cycle Life and Rate Capability of Single-Crystal, Ni-Rich LiNi0.9Co0.05Mn0.05O2 Enabled by 1,2,4-1H-Triazole Additive
| Autor: | Yong Yang, Ke Zhou, Gaopan Liu, Yue Zou, Ningbo Xu, Jianming Zheng, Jing Zhang, Xiaozhen Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Thermal decomposition chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention Nickel Chemical engineering chemistry law Electrode General Materials Science Interphase 0210 nano-technology Ternary operation Single crystal |
| Zdroj: | ACS Applied Materials & Interfaces. 13:16427-16436 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Ternary LiNixCoyMnzO2 oxides with extremely high nickel (Ni) contents (x ≥ 0.9) are promising cathode candidates developed for higher-energy-density lithium-ion batteries, with an aim to relieve mileage anxiety. However, the structural and interfacial instability still restrict their application in electric vehicles. In this work, a novel electrolyte additive 1,2,4-1H-Triazole (HTZ) is introduced to improve the interfacial stability of LiNi0.9Co0.05Mn0.05O2 (NCM90), promoting cycle life both at 30 °C and a harsh condition of 60 °C, as well as rate capability. The NCM90||Li cells with 0.3% HTZ-added electrolyte retain 86.6% of their original capacity after 150 cycles at 1C and 30 °C, well exceeding 74.8% obtained with the baseline electrolyte. It is revealed that the additive HTZ could inhibit the thermal decomposition of LiPF6 salt and suppress the generation of HF acidic species. More importantly, additive HTZ is preferentially oxidized to construct a compact and dense cathode electrolyte interphase (CEI) layer, which is beneficial for stabilizing the electrode/electrolyte interface and suppressing unwanted side reactions. |
| Databáze: | OpenAIRE |
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