Ti surface doping of LiNi_0.5Mn_1.5O_4-δ positive electrodes for lithium ion batteries.

ABSTRACT: The particle surface of LiNi_0.5Mn_1.5O_4-δ (LNMO), a Li-ion battery cathode material, has been modified by Ti cation doping through a hydrolysis-condensation reaction followed by annealing in oxygen. The effect of different annealing temperatures (500-850 °C) on the Ti distribution and electrochemical performance of the surface modified LNMO was investigated. Ti cations diffuse from the preformed amorphous 'TiO _x ' layer into the LNMO surface during annealing at 500 °C. This results in a 2-4 nm thick Ti-rich spinel surface having lower Mn and Ni content compared to the core of the LNMO particles, which was observed with scanning transmission electron microscopy coupled with compositional EDX mapping. An increase in the annealing tempe

SUBMITTER: Ulu Okudur F 

PROVIDER: S-EPMC9078446 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature