Surface-segregated, high-voltage spinel LiMn1.5Ni 0.42Ga0.08O4 cathodes with superior high-temperature cyclability for lithium-ion batteries

  • Shin D
  • Manthiram A
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Abstract

The substitution of a small amount of Ga in the high-voltage spinel cathode LiMn1.5Ni0.42Ga0.08O4leads to superior cyclability at room temperature and 55 °C along with higher rate capability with conventional electrolytes compared to that found with the LiMn1.5Ni0.5O4cathode. The superior performance is attributed to the segregation of the inert Ga3+ions to the surface during the synthesis process, providing a robust, more stable interface with the electrolyte at the high operating voltage (~ 4.7 V), along with the stabilization of the spinel structure with a disordering of the cations in the octahedral sites. © 2011 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Electrochemical performance
  • High-voltage cathodes
  • Lithium-ion batteries
  • Spinel cathodes
  • Surface segregation

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