Charge–Discharge Properties of LiNi_0.5Mn_1.5O₄ Cathodes Coated with Ta and P in Li-Ion Batteries

抄録

Li-ion batteries with LiNi_0.5Mn_1.5O₄ cathodes offer high energy density; however, they face technical challenges due to side reactions related to metal dissolution and gas emissions caused by electrolyte decomposition, which hinder their practical applications. To address these issues, we introduced (Ta and P)-coating on LiNi_0.5Mn_1.5O₄ particles using an aqueous solution containing Li, P, and Ta ions. Float gas evolution results demonstrated that the (Ta and P)-coating could effectively suppress gas generation on the LiNi_0.5Mn_1.5O₄ cathode. Electrochemical impedance spectroscopic measurements before and after the float test revealed that the coating also mitigated increases in interfacial resistance, indicating the formation of a more stable interface between the coating layer and the electrolyte. Together, these effects enhance active material utilization and extend cycle life. Our study demonstrates the potential of Ta and P coatings to improve the high-temperature stability and long-term durability of LiNi_0.5Mn_1.5O₄-based lithium-ion batteries.