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A Convenient Synthesis Route for Co3O4 Hollow Microspheres and Their Application as a High Performing Anode in Li-Ion Batteries
ACS Omega ( IF 3.7 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsomega.7b01294
Padalingam Gurunathan 1 , Pedda Masthanaiah Ette 1 , Narayanan Lakshminarasimhan , Kannadka Ramesha 1
Affiliation  

A new, rapid, and cost-effective method for synthesizing hollow microspheres (HMSs) of cobalt oxide (Co3O4) using the phloroglucinol–formaldehyde gel route is reported here. Further, the synthesized hollow Co3O4 microspheres were investigated as an anode material for Li-ion batteries. The Co3O4 hollow spheres exhibited excellent electrochemical performance and cycling stability, for example, a capacity of 915 mA h g–1 was obtained at 1 C rate over 350 cycles. The material also exhibited good performance at high rates, viz., capacities of 500, 350, and 250 mA h g–1 at 10 C, 25 C, and 50 C, respectively, with good capacity retention over 500 cycles. The excellent electrochemical performance of Co3O4 can be ascribed to the porous nanoarchitecture that provides a short diffusion length for Li+ ions and high electrolyte percolation in the porous structure. Additionally, the thin porous wall of the nanocages provides an effective way to overcome the issues associated with the volume change occurring during Li charge/discharge. The conversion of Co3O4 into Co upon discharge was also probed by measuring the magnetic properties.

中文翻译:

Co 3 O 4空心微球的简便合成路线及其在锂离子电池中作为高性能阳极的应用

本文报道了使用间苯三酚-甲醛凝胶途径合成氧化钴(Co 3 O 4)的空心微球(HMS)的一种新的,快速且经济高效的方法。此外,研究了合成的空心Co 3 O 4微球作为锂离子电池的负极材料。Co 3 O 4空心球表现出出色的电化学性能和循环稳定性,例如,在350个循环中,以1 C的速率获得的容量为915 mA hg –1。该材料在高速率下也表现出良好的性能,即500、350和250 mA hg –1的容量分别在10 C,25 C和50 C下工作,在500个循环中保持了良好的容量。Co 3 O 4优异的电化学性能可以归因于多孔纳米结构,该结构为Li +离子提供了短的扩散长度,并在多孔结构中提供了较高的电解质渗透。另外,纳米笼的薄壁多孔壁提供了一种有效的方法来克服与在Li充电/放电过程中发生的体积变化相关的问题。还通过测量磁性来探查放电时Co 3 O 4向Co的转化。
更新日期:2017-11-07
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