Enhanced cyclability and energy density of mid-nickel layered oxide cathode material LiNi_0.55Mn_0.25Co_0.20O₂ by niobium doping via solvothermal method

Author(s)

Oliveira Filho, Helder R. ; Santos, Erick A. ; Monteiro, Robson S. ; Zanin, Hudson ; Teofilo, Reinaldo F.

• Document type: Journal article
• Source: Electrochimica Acta; v. 507, p. 11-pg., 2024-10-10.

Abstract

Ni-based layered oxide materials are among the most promising cathode materials for the next generation of lithium-ion batteries due to their higher energy capacity. However, capacity decay occurs due to degradation mechanisms that reduce the electrochemical performance of this type of material. This work aims to synthesize Nb-doped LiNi0.55Mn0.25Co0.20O2 (Nb-NCM) materials via the solvothermal method to enhance the cyclability and energy density of the layered oxide cathode. The effects of Nb doping on the microstructure and the electrochemical performance of the cathodes are investigated. The introduction of the contents of Nb expands the structural lattice parameters and decreases the Li+/Ni2+ cation mixing degree of the NCM cathode. Furthermore, the Nb doping enhances the electrochemical activity of LiNi0.55Mn0.25Co0.20O2, increasing its initial discharge capacity to 169.61 mAhg- 1 when 1% of Nb was used as a dopant (1%Nb-NCM) in contrast to the capacity of 149.45 mAhg-1 presented by the pristine material. The modified 1.0%Nb-NCM material also exhibits remarkable cycling performance with a capacity retention of 92.7% after 100 cycles at the rate of 1 C (2.8-4.3 V). This work suggests a rational strategy for high-performance cathode for lithium-ion batteries, proposing the extension of Nb doping to enhance Ni-mid material's cyclability. (AU)

• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 22/02222-0 - Development of prototype pouch cells of lithium-sulfur (Li-S) batteries in solid-liquid state with high stability and advanced scale of technological maturity
• Grantee: Érick Alves Santos
• Support Opportunities: Scholarships in Brazil - Doctorate