For developing high-energy-density nickel-rich layered oxide cathodes with extended cycle life and rate capability, it is necessary to mitigate mechanical degradation caused by volume change and surface side reactions between cathode and electrolyte. To overcome these problems, a novel single crystalline LiNi_0.8Co_0.1Mn_0.1O₂ material is coated by Li-reactive materials. Results show that the degree of cation mixing is significantly reduced and it is caused by the coating layer. The residual lithium compounds on the surface of the material are greatly removed by the coating materials through the formation of spinel Co₃O₄ and LiMn₂O₄ layer. The electrochemical performance of the modified materials is significantly improved. They conserve 91.4% and about 89.9% of the initial capacity (186.6 mAh·g⁻¹ and 186.5 mAh·g⁻¹, respectively) at 1 C after 100 cycles. They also exhibit greater rate capability of 161.7 mAh·g⁻¹ and 157.9 mAh·g⁻¹ at 5 C, remaining 79.3% and 77.4% capacity of 0.1C. The enhancements are attributed to the coated spinel phase with excellent structural stability. This generated cubic spinel phase suppresses volume change and thus inhibits the formation of surface cracks, resulting in fine surface structure during charge and discharge process.

为了开发具有延长的循环寿命和倍率能力的高能量密度的富镍层状氧化物阴极，必须减轻由于阴极和电解质之间的体积变化和表面侧反应引起的机械降解。为了克服这些问题，一种新型的单晶LiNi _0.8 Co _0.1 Mn _0.1 O ₂材料被Li-反应性材料涂覆。结果表明，阳离子混合程度显着降低，这是由涂层引起的。通过形成尖晶石Co ₃ O ₄和LiMn ₂ O ₄，涂层材料极大地去除了材料表面的残留锂化合物。层。改性材料的电化学性能得到显着改善。在100个循环后，它们在1 C时可保存91.4％和大约89.9％的初始容量（分别为186.6 mAh·g ^-1和186.5 mAh·g ^-1）。它们还显示出在5 C时具有161.7 mAh·g ^-1和157.9 mAh·g ^-1的更高倍率容量，剩余的容量分别为0.19.3C的79.3％和77.4％。增强归因于具有优异结构稳定性的涂层尖晶石相。这种生成的立方尖晶石相抑制了体积变化，从而抑制了表面裂纹的形成，从而在充电和放电过程中形成了精细的表面结构。