Multiscale Deficiency Integration by Na-Rich Engineering for High-Stability Li-Rich Layered Oxide Cathodes
| Autor: | Wei He, Wensheng Wei, Dong-Liang Peng, Baisheng Sa, Te Xie, Hongfei Zheng, Xiangjun Lu, Qun Liu, Laisen Wang, Qingshui Xie, Yinggan Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Doping chemistry.chemical_element 02 engineering and technology Manganese 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Ion Surface coating chemistry Chemical engineering law Transmission electron microscopy General Materials Science Density functional theory 0210 nano-technology |
| Zdroj: | ACS applied materialsinterfaces. 13(7) |
| ISSN: | 1944-8252 |
| Popis: | Lithium-rich manganese-based (LRM) layered oxides are considered as one of the most promising cathode materials for next-generation high-energy-density lithium-ion batteries (LIBs) because of their high specific capacity (>250 mAh g-1). However, they also go through severe capacity decay, serious voltage fading, and poor rate capability during cycling. Herein, a multiscale deficiency integration, including surface coating, subsurface defect construction, and bulk doping, is realized in a Li1.2Mn0.54Ni0.13Co0.13O2 cathode material by facile Na-rich engineering through a sol-gel method. This multiscale design can significantly improve the bulk and surface structural stability and diffusion rate of Li+ ions of electrode materials. Specifically, an outstanding specific capacity of 201 mAh g-1 is delivered at 1C of the designed cathode material after 400 cycles, relating to a large capacity retention of 89.0%. Meanwhile, the average voltage is retained up to 3.13 V with a large voltage retention of 89.6% and the energy density is maintained at 627.4 Wh kg-1. In situ X-ray diffraction (XRD), ex situ transmission electron microscopy (TEM) investigations, and density functional theory (DFT) calculations are conducted to explain the greatly enhanced electrochemical properties of a LRM cathode. We believe that this strategy would be a meaningful reference of LRM cathode materials for the research in the future. |
| Databáze: | OpenAIRE |
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