王接喜

鲁明娇论文“Boosting the performance of LiNi0.90Co0.06Mn0.04-based electrode by uniform Li3PO4 coating via atomic layer deposition”被Chinese Chemical Letters接收发表

发布时间：2023-02-15

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Ultra-high nickel material is considered to be a promising cathode material. However, with the increase of nickel content, the interfacial side reactions between the cathode and electrolyte become increasingly serious. Herein, an atomically controllable ionic conductor Li₃PO₄ (LPO) coating was deposited on the LiNi_0.90Co_0.06Mn_0.04O₂ (NCM9064) cathode by the atomic layer deposition method（ALD）. Scanning electron microscope (SEM) images and energy dispersive spectrum (EDS) analyses results showed that the LPO coating was uniformly and densely covered on the surface of the secondary particles of NCM9064, helping to prevent the direct contact between the electrolyte and cathode during the charging and discharging process. In addition, the coating layer was electrochemically stable. As a result, the interfacial side reactions during the long cycle were effectively suppressed, and the SEI layer at the interfacewas stabilized. In the half-cell, the electrode with 20 layers of LPO deposition (ALD-LPO-20) exhibited an excellent capacity retention of 81 % after 200 cycles at the cut-off voltage of 4.3 V, which was 18 % higher than the unmodified material (ALD-LPO-0). Besides, the moderate LPO coating improved the rate capability and high temperature cycling performance of NCM9064. This study provides a method for the modification of ultra-high nickel cathode materials.