Enhanced Electrochemical Performance of Li1.2[Mn0.54Co0.13Ni0.13]O2 Enabled by Synergistic Effect of Li1.5Na0.5SiO3 Modification. Issue 15 (8th June 2020)

• Record Type: Journal Article
• Authors: Nie, Xiangkun; Xu, Zhou; Chen, Lina; Li, Jianwei; Cheng, Jun; Sun, Qing; Qiao, Ying; Xu, Xiaoyan; Zhang, Yamin; Li, Deping; Peng, Ruiqin; Ci, Lijie
• Is Part Of: Advanced materials interfaces. Volume 7:Issue 15(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-08
• Subjects: doping -- electrochemical performance -- layered cathode materials -- Li1.5Na0.5SiO3 -- surface coatings; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202000378
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Surface coating is effective in improving the electrochemical properties of layered lithium‐rich Mn‐based oxide‐Li1.2 [Mn0.54 Co0.13 Ni0.13 ]O2 (LLMO). In this work, a novel coating material‐Na + doped Li2 SiO3 (forming Li1.5 Na0.5 SiO3 ) is selected to modify LLMO. By means of the modification, the Na + doping is realized along with the Li2− x Na x SiO3 coating on the surface of Li1.2− x Na x [Mn0.54 Co0.13 Ni0.13 ]O2 (NLLMO). The higher electrochemical activity of Li2− x Na x SiO3 than Li2 SiO3, and surface Na + doping of LLMO, can significantly improve the battery performance of the LLMO cathode. Consequently, 1 wt% Li1.5 Na0.5 SiO3 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% Li1.5 Na0.5 SiO3 modified LLMO sheds more light on improving the properties of Li‐rich cathode materials. Abstract : A surface modification strategy is proposed to improve the electrochemical performance of Li1.2 [Mn0.54 Co0.13 Ni0.13 ]O2 (LLMO). With surface Na + doping and Li2− x Na x SiO3 coating realized by Li1.5 Na0.5 SiO3 modification, the as‐obtained electrodes exhibit obviously suppressed voltage fade excellent rate and outstanding cycle performance.