Surface modification with oxygen vacancy in Li-rich layered oxide Li1.2Mn0.54Ni0.13Co0.13O2 for lithium-ion batteries. Issue 6 (June 2019)

• Record Type: Journal Article
• Authors: Chen, Bozhou; Zhao, Bangchuan; Zhou, Jiafeng; Fang, Zhitang; Huang, Yanan; Zhu, Xuebin; Sun, Yuping
• Is Part Of: Journal of materials science & technology. Volume 35:Issue 6(2019)
• Page Start: 994
• Page End: 1002
• Publication Date: 2019-06
• Subjects: Li-rich cathode oxide material -- Oxygen vacancy -- Solvothermal method -- Electrochemical performance; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2018.12.021
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: A couple of layered Li-rich cathode materials Li1.2 Mn0.54 Ni0.13 Co0.13 O2 without any carbon modification are successfully synthesized by solvothermal and hydrothermal methods followed by a calcination process. The sample synthesized by the solvothermal method (S-NCM) possesses more homogenous microstructure, lower cation mixing degree and more oxygen vacancies on the surface, compared to the sample prepared by the hydrothermal method (H-NCM). The S-NCM sample exhibits much better cycling performance, higher discharge capacity and more excellent rate performance than H-NCM. At 0.2 C rate, the S-NCM sample delivers a much higher initial discharge capacity of 292.3 mAh g −1 and the capacity maintains 235 mAh g −1 after 150 cycles (80.4% retention), whereas the corresponding capacity values are only 269.2 and 108.5 mAh g −1 (40.3% retention) for the H-NCM sample. The S-NCM sample also shows the higher rate performance with discharge capacity of 118.3 mAh g −1 even at a high rate of 10 C, superior to that (46.5 mAh g −1 ) of the H-NCM sample. The superior electrochemical performance of the S-NCM sample can be ascribed to its well-ordered structure, much larger specific surface area and much more oxygen vacancies located on the surface.