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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 507, p. 11-pg., 2024-10-10.

Resumo

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)

• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 22/02222-0 - Desenvolvimento de protótipos pouch cells de baterias de lítio-enxofre (Li-S) em estado sólido-líquido com alta estabilidade e avançada escala de maturidade tecnológica
• Beneficiário: Érick Alves Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado