Multiscale Deficiency Integration by Na-Rich Engineering for High-Stability Li-Rich Layered Oxide Cathodes
- 8 February 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 13 (7), 8239-8248
- https://doi.org/10.1021/acsami.0c19040
Abstract
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.Funding Information
- Ministry of Science and Technology of the People's Republic of China (2016YFA0202602)
- Natural Science Foundation of Fujian Province (2019J06003)
- National Natural Science Foundation of China (51701169, 51871188, 51931006)
- “Double-First Class” Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
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