Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5438055 | Ceramics International | 2017 | 24 Pages |
Abstract
This paper introduces a unique porous yolk-shell structured Co3O4 microball, which is synthesized by spray pyrolysis from precursor solution with polyvinylpyrrolidone (PVP) additive. PVP acts as an organic template in the pyrolytic reaction facilitating the formation of yolk-shell structure. The electrochemical properties of porous yolk-shell Co3O4 microballs evaluated as anode materials for lithium ion batteries exhibit high initial columbic efficiency of 77.9% and high reversible capacity of 1025 mAh gâ1 with capacity retention of 98.8% after 150 cycles at 1 A gâ1. In contrast, the hollow microballs obtained without PVP addition show obvious capacity decay from 1033 to 748 mAh gâ1 after 150 cycles with the capacity retention of 72.3%. In addition, the microballs with porous yolk-shell structure exhibit better rate performance. The superior electrochemical performance is mainly attributed to the unique porous yolk-shell structure which provides large voids to buffer volume expansion and enlarge the contact area with the electrolyte, shortening the diffusion path of the lithium ions.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hongmei Liang, Zhixing Wang, Huajun Guo, Xinhai Li,