CoNiO₂ nanosheets were prepared by a simple hydrothermal process, and then the spherical CoNiO₂@C micro-nano structures composed of nanoparticles were designed by morphology reshaping for the first time. The results show that the carbon coating changes the morphology of CoNiO₂, and the CoNiO₂@C composite shows porous microsphere structure consisted of nanoparticles. The porous structure combined with highly conductive carbon shell indicates an improved electronic conductivity and charge transfer. The carbon shell decreases the charge-transfer resistance of CoNiO₂, and thus enhances the kinetic performances. The pristine CoNiO₂ and CoNiO₂@C (3, 5, and 10 wt%) composites deliver charge/discharge capacities of 511.7/526.9, 811.3/826.3, 997.1/1013.1, and 1216.1/1241.8 mAh g⁻¹ at 500 mA g⁻¹ after 200 cycles, respectively. The carbon coating improves the reversible capacity, rate capability, and cycle performance of CoNiO₂, especially at high rates. The improved rate performance, excellent cycle performance, and high kinetic performances are ascribed to the elaborate design of architecture and composition. Hence, such porous CoNiO₂@C microsphere consisted of nanoparticles can be regarded as promising candidates as anode materials for lithium-ion battery.

通过简单的水热法制备了CoNiO ₂纳米片，并首次通过形态重塑设计了由纳米颗粒组成的球形CoNiO ₂ @C微纳米结构。结果表明，碳涂层改变了CoNiO ₂的形貌，CoNiO ₂ @C复合材料显示出由纳米颗粒组成的多孔微球结构。多孔结构与高导电性碳壳相结合，表明电子电导率和电荷转移得到改善。碳壳降低了CoNiO ₂的电荷转移电阻，从而增强了动力学性能。原始的CoNiO ₂和CoNiO ₂@C（3、5和10 wt％）复合材料在200个循环后分别在500 mA g ^-1下提供511.7 / 526.9、811.3 / 826.3、997.1 / 1013.1和1216.1 / 1241.8 mAh g ^-1的充电/放电容量。碳涂层改善了CoNiO ₂的可逆容量，倍率能力和循环性能，尤其是在高倍率下。改进的速率性能，出色的循环性能和高动力学性能归因于结构和组成的精心设计。因此，这种由纳米颗粒组成的多孔CoNiO ₂ @C微球可以被认为是锂离子电池负极材料的有希望的候选者。