Electrochemical performances of niobium-doped new spherical low-cobalt Li-rich Mn-based Li1.14Mn0.476Ni0.254Co0.048Al0.016O2 cathode. (August 2022)

• Record Type: Journal Article
• Authors: Liu, Xinhui; Yu, Bo; Wang, Mingshan; Jin, Yifu; Fu, Zheng; Chen, Junchen; Ma, Zhiyuan; Guo, Bingshu; Huang, Yun; Li, Xing
• Is Part Of: Materials today communications. Volume 32(2022)
• Publication Date: 2022-08
• Subjects: Li-rich Mn-based layered oxide -- Low-cobalt cathode -- Nb doping -- Fundamental mechanism -- Electrical properties -- Energy storage and conversion; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104170
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Here, niobium (Nb) -doped new spherical low-cobalt Li-rich Mn-based Li1.14 Mn0.476 Ni0.254 Co0.048 Al0.016 O2 cathode materials are reported. It is found that Nb-doping could form strong NbO bonds to stabilize the lattice structure, alleviate structural disorder and maintain the discharge capacity of the cathode during cycling. Moreover, Nb-doping could reduce surface LiOH/Li2 CO3 by-product formation during the synthesis process, thereby reducing detrimental side reactions between the electrode and electrolyte resulting in longer cycle life. In addition, the Nb doping also could extend the interlayer spacing, which is conducive to the lithium ion diffusion. The sample (Li1.14 Mn0.466 Ni0.249 Co0.046 Al0.015 Nb0.02 O2, Nb-0.02) doped with Nb at a molar ratio of 2 % in the total transition metals exhibits the best electrochemical performance. It shows the initial coulombic efficiency of 79.6 % and a high discharge specific capacity of 192 mAh g -1 with 92.8 % capacity retention after 200 cycles under C/5 charge and C/3 discharge at the cut-off voltage of 2.0–4.8 V. Graphical Abstract: ga1