| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1604961 | Journal of Alloys and Compounds | 2017 | 9 Pages |
•LiNi0.5Co0.2Mn0.3O2 has been functionally coated with Li2SiO3 via a two-step method.•Li2SiO3 possesses a high Li+-ion conduction and excellent structural stability.•The Li2SiO3-coated sample shows improved electrochemical properties.
Layered LiNi0.5Co0.2Mn0.3O2 (NCM523) material has been functionally coated with a uniform and thin layer of Li2SiO3 via a two-step method. Owing to its high lithium ion conduction and excellent structural stability against electrolyte decomposition, Li2SiO3 could greatly improve the Li+ ion diffusion rate and ameliorate the electrochemical capability of the layered oxide materials. Electrochemical tests illustrate that Li2SiO3 used as a Li+-ion conductor greatly improves electrochemical performance of the NCM523 cathode at high current density under high cutoff voltage. Particularly, the Li2SiO3-modified sample delivers an initial capacity of 140.0 mAh g−1 and remains 134.1 mAh g−1 even at a high current density of 10 C after 100 cycles, while the capacity of the pristine decreased sharply to 81.5 mAh g−1. The capacity retention of Li2SiO3-modified NCM523 is 96.1%, while only 55.3% for the bare sample. This result demonstrates an efficient method for the Li2SiO3-modified NCM523 cathode with enhanced electrochemical performance, which has a certain reference for other cathode materials of Li-ion batteries.
Graphical abstractLiNi0.5Co0.2Mn0.3O2 has been functionally coated with Li2SiO3 via a two-step method. The Li2SiO3-coated sample shows improved electrochemical properties.Figure optionsDownload full-size imageDownload as PowerPoint slide
