Surface LiMn1.4Ni0.5Mo0.1O4 Coating and Bulk Mo Doping of Li-Rich Mn-Based Li1.2Mn0.54Ni0.13Co0.13O2 Cathode with Enhanced Electrochemical Performance for Lithium-Ion Batteries

Xueqian Ji; Yuxing Xu; Hailan Feng; Pengfei Wang; Yuncheng Zhou; Jiechen Song; Qing Xia; Qiangqiang Tan

doi:10.1021/acsami.1c14682

Surface LiMn_1.4Ni_0.5Mo_0.1O₄ Coating and Bulk Mo Doping of Li-Rich Mn-Based Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ Cathode with Enhanced Electrochemical Performance for Lithium-Ion Batteries

ACS Appl Mater Interfaces. 2021 Oct 13;13(40):47659-47670. doi: 10.1021/acsami.1c14682. Epub 2021 Sep 30.

Authors

Xueqian Ji^{1

2}, Yuxing Xu^{1

3}, Hailan Feng^{1

3}, Pengfei Wang^{1

3}, Yuncheng Zhou^{1

2}, Jiechen Song^{1

2}, Qing Xia^{1

3

4}, Qiangqiang Tan^{1

5

3}

Affiliations

¹ State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
² School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
³ Hebei Technology Innovation Center of Advanced Energy Materials, Langfang 065001, China.
⁴ Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China.
⁵ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 34592096
DOI: 10.1021/acsami.1c14682

Abstract

To improve the initial Coulombic efficiency, cycling stability, and rate performance of the Li-rich Mn-based Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode, the combination of LiMn_1.4Ni_0.5Mo_0.1O₄ coating with Mo doping has been successfully carried out by the sol-gel method and subsequent dip-dry process. This strategy buffers the electrodes from the corrosion of electrolyte and enhances the lattice parameter, which could inhibit the oxygen release and maintain the structural stability, thus improving the cycle stability and rate capability. After LiMn_1.4Ni_0.5Mo_0.1O₄ modification, the initial discharge capacity reaches 272.4 mAh g^-1 with a corresponding initial Coulombic efficiency (ICE) of 84.2% at 0.1C (1C = 250 mAh g^-1), far higher than those (221.5 mAh g^-1 and 68.9%) of the pristine sample. Besides, the capacity retention of the coated sample is enhanced by up to 66.8% after 200 cycles at 0.1C. Especially, the rate capability of the coated sample is 95.2 mAh g^-1 at 5C. XRD, SEM, TEM, XPS, and Raman spectroscopy are adopted to characterize the morphologies and structures of the samples. This coating strategy has been demonstrated to be an effective approach to construct high-performance energy storage devices.

Keywords: Li-rich Mn-based oxides; cathode; excellent cyclability; lithium-ion batteries; surface modification.