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Enhanced Electrochemical Performance of Li 1.2 [Mn 0.54 Co 0.13 Ni 0.13 ]O 2 Enabled by Synergistic Effect of Li 1.5 Na 0.5 SiO 3 Modification
Author(s) -
Nie Xiangkun,
Xu Zhou,
Chen Lina,
Li Jianwei,
Cheng Jun,
Sun Qing,
Qiao Ying,
Xu Xiaoyan,
Zhang Yamin,
Li Deping,
Peng Ruiqin,
Ci Lijie
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202000378
Subject(s) - electrochemistry , materials science , cathode , doping , lithium (medication) , coating , analytical chemistry (journal) , oxide , chemical engineering , nanotechnology , electrode , metallurgy , chemistry , medicine , optoelectronics , chromatography , engineering , endocrinology
Surface coating is effective in improving the electrochemical properties of layered lithium‐rich Mn‐based oxide‐Li 1.2 [Mn 0.54 Co 0.13 Ni 0.13 ]O 2 (LLMO). In this work, a novel coating material‐Na + doped Li 2 SiO 3 (forming Li 1.5 Na 0.5 SiO 3 ) is selected to modify LLMO. By means of the modification, the Na + doping is realized along with the Li 2− x Na x SiO 3 coating on the surface of Li 1.2− x Na x [Mn 0.54 Co 0.13 Ni 0.13 ]O 2 (NLLMO). The higher electrochemical activity of Li 2− x Na x SiO 3 than Li 2 SiO 3 , and surface Na + doping of LLMO, can significantly improve the battery performance of the LLMO cathode. Consequently, 1 wt% Li 1.5 Na 0.5 SiO 3 modified LLMO exhibits much improved cycling stability than the others with the minimum voltage decay of only 0.198 V and the highest capacity retention of 83.9% after 100 cycles at 0.5C (1C = 200 mAh g −1 ). Moreover, it also exhibits an excellent rate performance (200.6 mAh g −1 at 1C). The outstanding electrochemical performance of 1 wt% Li 1.5 Na 0.5 SiO 3 modified LLMO sheds more light on improving the properties of Li‐rich cathode materials.