Simultaneous Enhancement of Interfacial Stability and Kinetics of Single-Crystal LiNi0.6Mn0.2Co0.2O2 through Optimized Surface Coating and Doping
| Autor: | Linsen Li, Haoyuan Li, Jin Xie, Zijian Peng, Haojie Zhao, Yi Yu, Xincan Cai, Yue Zhang, Lianqi Zhao, Yuqing Zuo, Guannan Qian, Wenda Bao, Longxing Su |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Conformal coating Doping Bioengineering 02 engineering and technology General Chemistry engineering.material Surface engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Surface coating Atomic layer deposition Coating Chemical engineering engineering General Materials Science Surface charge 0210 nano-technology Layer (electronics) |
| Zdroj: | Nano Letters. 20:8832-8840 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.0c03778 |
| Popis: | Balancing interfacial stability and Li+ transfer kinetics through surface engineering is a key challenge in developing high-performance battery materials. Although conformal coating enabled by atomic layer deposition (ALD) has shown great promise in controlling impedance increase upon cycling by minimizing side reactions at the electrode-electrolyte interface, the coating layer itself usually exhibits poor Li+ conductivity and impedes surface charge transfer. In this work, we have shown that by carefully controlling postannealing temperature of an ultrathin ZrO2 film prepared by ALD, Zr4+ surface doping could be achieved for Ni-rich layered oxides to accelerate the charge transfer yet provide sufficient protection. Using single-crystal LiNi0.6Mn0.2Co0.2O2 as a model material, we have shown that surface Zr4+ doping combined with ZrO2 coating can enhance both the cycle performance and rate capability during high-voltage operation. Surface doping via controllable postannealing of ALD surface coating layer reveals an attractive path toward developing stable and Li+-conductive interfaces for single-crystal battery materials. |
| Databáze: | OpenAIRE |
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