Lithium cobalt oxides (LiCoO₂) possess a high theoretical specific capacity of 274 mAh g^–1. However, cycling LiCoO₂-based batteries to voltages greater than 4.35 V versus Li/Li⁺ causes significant structural instability and severe capacity fade. Consequently, commercial LiCoO₂ exhibits a maximum capacity of only ~165 mAh g^–1. Here, we develop a doping technique to tackle this long-standing issue of instability and thus increase the capacity of LiCoO₂. La and Al are concurrently doped into Co-containing precursors, followed by high-temperature calcination with lithium carbonate. The dopants are found to reside in the crystal lattice of LiCoO₂, where La works as a pillar to increase the c axis distance and Al as a positively charged centre, facilitating Li⁺ diffusion, stabilizing the structure and suppressing the phase transition during cycling, even at a high cut-off voltage of 4.5 V. This doped LiCoO₂ displays an exceptionally high capacity of 190 mAh g^–1, cyclability with 96% capacity retention over 50 cycles and significantly enhanced rate capability.

钴酸锂（LiCoO ₂）具有274 mAh g ^–1的高理论比容量。但是，将基于LiCoO ₂的电池循环至相对于Li / Li ^+的电压大于4.35 V会导致明显的结构不稳定性和严重的容量衰减。因此，商用LiCoO ₂的最大容量仅为〜165 mAh g ^–1。在这里，我们开发了一种掺杂技术来解决这一长期存在的不稳定性问题，从而提高了LiCoO ₂的容量。将La和Al同时掺杂到含Co的前驱物中，然后用碳酸锂进行高温煅烧。发现掺杂剂存在于LiCoO _2的晶格中，其中La用作支柱以增加c轴距离，Al用作带正电的中心，即使在4.5 V的高截止电压下，也可以促进Li ⁺扩散，稳定结构并抑制循环过程中的相变。掺杂的LiCoO ₂具有190 mAh g ^–1的极高容量，可循环性，在50个循环中可保持96％的容量，并显着提高了倍率能力。