We tried to form an Li₂ZrO₃(LZO) coating layer on LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) cathode material to improve its thermal and electrochemical properties using a sol-gel technique. A homogeneous coating of LZO on NCM622 was obtained with different weight ratio (1.0, 2.0, and 4 wt.%) of LZO:NCM622. The surface morphology and elemental analysis of LZO@NCM622 were carried out by FE-SEM with EDS mapping. FE-TEM images showed that ~13 nm nanolayer of LZO was coated on the NCM622 surface (1 wt.% LZO@NCM622). The LZO coating improved the electrohcemical reaction kinetics and galvanostatic charge-discharge performance than bare NCM622. The LZO coating can protect the NCM622 surface from HF attack, and restricts the degradation of the active cathode material. The thermal properties of the NCM622 cathode at the high temperature of 60 °C were remarkably improved by the LZO coating layer because of a blocking in the direct contact between the cathode and organic electrolyte. In addition, galvanostatic intermittent titration technique (GITT) and potentiostatic intermittent titration technique (PITT) showed diffusion kinetics of Li-ion intercalation were maintained in 50 cycles at 1 wt.% LZO@NCM622. Finally, full-cell cycle performance using 1 wt.% LZO@NCM622 exhibited better cycle retention until 99% compared with 83% of pure NCM622. Given these results, LZO coating is widely considered to be a viable surface coating material for improving the excellent thermal and electrochemical properties of NCM622.

我们试图在LiNi _0.6 Co _0.2 Mn _0.2 O ₂上形成Li ₂ ZrO ₃（LZO）涂层（NCM622）阴极材料，使用溶胶凝胶技术改善其热性能和电化学性能。获得具有不同重量比（1.0、2.0和4重量％）的LZO：NCM622的LZO在NCM622上的均匀涂层。LZO @ NCM622的表面形貌和元素分析通过FE-SEM和EDS作图。FE-TEM图像显示在NCM622表面上涂覆了约13nm的LZO纳米层（1重量％的LZO @ NCM622）。与裸露的NCM622相比，LZO涂层改善了电动反应动力学和恒电流充放电性能。LZO涂层可以保护NCM622表面免受HF的侵蚀，并限制活性阴极材料的降解。NCM622阴极在60°C的高温下的热性能通过LZO涂层得到了显着改善，这是因为阴极和有机电解质之间的直接接触受阻。此外，恒电流间歇滴定技术（GITT）和恒电位间歇滴定技术（PITT）显示，锂离子嵌入的扩散动力学在1 wt。％LZO @ NCM622下保持50个循环。最后，与纯NCM622的83％相比，使用1 wt。％LZO @ NCM622的全细胞周期性能显示出更好的周期保持率，直到99％。鉴于这些结果，LZO涂层被广泛认为是用于改善NCM622优异的热和电化学性能的可行表面涂层材料。恒电流间歇滴定技术（GITT）和恒电位间歇滴定技术（PITT）表明，在1 wt。％LZO @ NCM622下，锂离子嵌入的扩散动力学保持了50个循环。最后，与纯NCM622的83％相比，使用1 wt。％LZO @ NCM622的全细胞周期性能显示出更好的周期保持率，直到99％。鉴于这些结果，LZO涂层被广泛认为是用于改善NCM622优异的热和电化学性能的可行表面涂层材料。恒电流间歇滴定技术（GITT）和恒电位间歇滴定技术（PITT）表明，在1 wt。％LZO @ NCM622下，锂离子嵌入的扩散动力学保持了50个循环。最后，与纯NCM622的83％相比，使用1 wt。％LZO @ NCM622的全细胞周期性能显示出更好的周期保持率，直到99％。鉴于这些结果，LZO涂层被广泛认为是用于改善NCM622优异的热和电化学性能的可行表面涂层材料。