To improve high temperature cycling performance of Ni-rich NCM cathode materials, dually-functionalized Ni-rich NCM cathode materials are developed. In detail, aluminum phosphate (AP), composed of Al and PO₄ functional groups, is used for surface modification of Ni-rich NCM cathode materials, which can be accomplished by one-step thermal treatment process. Our surface characterization analyses indicate that Al and PO₄-functionalized cathode-electrolyte interphases (CEI) layers are well developed on the surface of Ni-rich NCM cathode materials which can effectively suppress undesired reactions such as electrolyte decomposition and dissolution of transition metal components. In cycling performances, AP-modified Ni-rich NCM cathode materials exhibit markedly improved cycling retention at high temperature even after 150 cycles. Among these, the cell cycled with 0.5-AP NCM811 cathode material presents the highest retention while the cell cycled with non-modified NCM811 cathode material suffers from poor cycling retention.

为了提高富镍 NCM 正极材料的高温循环性能，开发了双功能化的富镍 NCM 正极材料。具体而言，由Al和PO ₄官能团组成的磷酸铝（AP）用于富Ni NCM正极材料的表面改性，可通过一步热处理工艺完成。我们的表面表征分析表明，Al 和 PO ₄功能化阴极-电解质中间相（CEI）层在富镍 NCM 正极材料的表面上发育良好，可以有效抑制不希望的反应，如电解质分解和过渡金属组分的溶解。在循环性能方面，AP 改性的富镍 NCM 正极材料即使在 150 次循环后也表现出显着提高的高温循环保持率。其中，使用 0.5-AP NCM811 正极材料循环的电池表现出最高的保留率，而使用未改性 NCM811 正极材料循环的电池循环保留率较差。