Preparation and Electrochemical Characterization of La and Al Co-doped NCM811 Cathode Materials

Mingyu Zhang; Chaoyong Wang; Junkai Zhang; Gang Li; Li Gu

doi:10.1021/acsomega.1c01552

Preparation and Electrochemical Characterization of La and Al Co-doped NCM811 Cathode Materials

ACS Omega. 2021 Jun 15;6(25):16465-16471. doi: 10.1021/acsomega.1c01552. eCollection 2021 Jun 29.

Authors

Mingyu Zhang¹, Chaoyong Wang¹, Junkai Zhang², Gang Li³, Li Gu⁴

Affiliations

¹ School of Information Engineering, Jilin Engineering Normal University, Changchun 130052, China.
² Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China.
³ Dali University, Dali 671003, China.
⁴ Sino-German Robotics School, Shenzhen Institute of Information Technology, Shenzhen 518172, China.

Abstract

LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) became a research hot point because of its low cost, environmental friendliness, and excellent electrochemical performance. However, Li⁺/Ni²⁺ intermixing is an essential factor affecting its applicability. Doping could be an important method to improve the electrochemical performance of NCM811-based cathode materials. In this work, La and Al co-doped NCM811 was prepared by a solid-state method. Results from X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) and electrochemical performance were discussed in depth. These showed that when La and Al doping concentrations were 1 and 0.5%, the samples showed the best performance. The as-improved performances were mainly attributed to the reduced Li⁺/Ni²⁺ intermixing, suppressed phase transition, and decreased potential polarization and impedance.