4.8 Article

A multifunctional manipulation to stabilize oxygen redox and phase transition in 4.6 V high-voltage LiCoO2 with sXAS and EPR studies

期刊

JOURNAL OF POWER SOURCES
卷 516, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230661

关键词

LiCoO2; High-voltage cycling; Anion-cation redox; Phase transition; Li-ion batteries

资金

  1. National Natural Science Foundation of China [21872055, 21902049, 21703068, 21902038]
  2. Shanghai Sailing Program [19YF1413000]

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By employing a multi-functional self-stabilization modification strategy involving trace Mg bulk doping, surface gradient Ti doping, and BaTiO3 dot coating, the challenges faced by LiCoO2 in terms of limited cycling stability at high voltage have been effectively addressed. Ti surface gradient doping strengthens the particle structure rigidity and mitigates irreversible oxygen redox at high voltage, leading to improved cyclic performance of LiCoO2 under 4.6 V high-voltage.
LiCoO2, as a domain cathode material of Li-ion batteries, faces a great deal of challenges due to the limited cycling stability at high voltage (>4.35 V vs. Li/Li+). These issues are tentatively addressed here by a multi-functional self-stabilization modification strategy, involving trace Mg bulk doping, surface gradient Ti doping and BaTiO3 dot coating in LiCoO2. The multifunctional synergy is verified to overcome the detrimental irreversible phase transition and the growth of impedance of LiCoO2 cycling at 4.6 V. By using soft X-ray absorption spectroscopy (sXAS) and electron paramagnetic resonance (EPR) techniques, we also elucidate that Ti surface gradient doping can reinforce the structure rigidity of the particles while significantly attenuates the irreversible oxygen redox at high voltage. All these strategies promote the prolonged cyclic performance of LiCoO2 under 4.6 V high-voltage through different mechanism. This elaborate investigation provides an instructive contribution in the advancement of high-voltage LiCoO2.

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