Trace amounts of zirconium (Zr) have been adopted to modify the crystal structure and surface of the Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathode material. During cycling at 1.0C, the Zr-modified NCM811 shows an improved capacity retention of 92% after 100 cycles, higher than 75% for pristine NMC811. In addition, the Zr-modified NCM811 is capable of delivering a discharge capacity of 107 mA h g⁻¹ at a 10.0C rate, much higher than 28 mA h g⁻¹ delivered by pristine materials. These improved electrochemical performances are ascribed to the dual functions of Zr modification. On one hand, part of the Zr enters the crystal lattice, which is beneficial for reducing the Li/Ni cation mixing and enhancing the crystal stability of the cathode. On the other hand, the rest of the Zr forms a 1–2 nm thick coating layer on the surface of the NCM811 cathode, which effectively prevents direct contact between NCM and the electrolyte, thus suppressing the detrimental interfacial reactions. Therefore, the Zr-modified LiNi_0.8Co_0.1Mn_0.1O₂ exhibited significantly enhanced cycling stability and charge/discharge rate capability in comparison with its untreated counterpart.

中文翻译：

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锆改性对改善富镍NiNi _0.8 Co _0.1 Mn _0.1 O ₂ †的电化学性能的双重作用

已采用痕量的锆（Zr）来修饰富Ni的LiNi _0.8 Co _0.1 Mn _0.1 O ₂（NCM811）正极材料的晶体结构和表面。在1.0C下循环期间，Zr改性的NCM811在100次循环后显示出改善的容量保持率，为92％，高于原始NMC811的75％。另外，Zr改性的NCM811能够以10.0C的速率提供107 mA hg ^-1的放电容量，远高于28 mA hg ^-1由原始材料提供。这些改善的电化学性能归因于Zr修饰的双重功能。一方面，Zr的一部分进入晶格，这有利于减少Li / Ni阳离子的混合并增强阴极的晶体稳定性。另一方面，其余的Zr在NCM811阴极的表面上形成1-2 nm厚的涂层，从而有效地防止了NCM与电解质之间的直接接触，从而抑制了有害的界面反应。因此，与未经处理的Zr改性的LiNi _0.8 Co _0.1 Mn _0.1 O _2相比，Zr改性的LiNi _0.8 Co _0.1 Mn _0.1 O ₂表现出显着增强的循环稳定性和充/放电速率能力。