Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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J.Forero-Saboya, I.A.Moiseev, M.-L.Vlara, D.Foix, M.Deschamps, A.M.Abakumov, J.-M.Tarascon, S.Mariyappan, 'A hydridoaluminate additive producing a protective coating on Ni-rich cathode materials in lithium-ion batteries', Adv. Energy Mat. (null)

Increasing the energy density of Li-ion batteries requires the use of high-capacity and high-voltage cathode materials. Recently, Ni-rich layered oxides have attracted attention as they could offer ~200 mAh g-1 when cycled up to 4.3 V. However, cycling these materials in their full capacity range often leads to excessive reactivity with the electrolyte resulting in particle cracking, transition metal dissolution and oxygen loss. In this study, we explore the use of lithium hydridoaluminates as electrolyte additives for lithium-ion batteries based on nickel-rich cathode materials. Being mild reducing agents, these additives act as HF scavengers avoiding transition metal dissolution from the cathode. Additionally, their oxidation results in the formation of an Al-rich protective layer on the cathode which dampens the surface reactivity, preventing surface reconstruction and impedance buildup. The combination of the two beneficial effects significantly extends the cycle life Li-ion batteries based on Ni-rich cathodes.