Synthesis and electrochemical performance of three-dimensionally ordered macroporous CoCr2O4 as an anode material for lithium ion batteries. (1st September 2017)

• Record Type: Journal Article
• Authors: Li, Zhen; Huang, Xiaoxiong; Hu, Jinbo; Stein, Andreas; Tang, Bohejin
• Is Part Of: Electrochimica acta. Volume 247(2017)
• Page Start: 1
• Page End: 11
• Publication Date: 2017-09-01
• Subjects: Three-dimensionally ordered macroporous CoCr2O4 -- Anode material -- Lithium ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.07.013
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: Three-dimensionally ordered macroporous (3DOM) CoCr2 O4 was synthesized by a colloidal crystal templating route and used as an anode material for lithium ion batteries. Benefiting from the porous structure and smaller particle size, the 3DOM-CoCr2 O4 anode exhibits a high specific capacity and excellent rate capability. After an initial specific capacity decrease from 1588 to 709 mAh g −1 during the first three cycles at 50 mAh g −1, the capacity exhibits an increasing trend in subsequent cycles. After 100 cycles, a high specific capacity of 1218 mAh g −1 is achieved, which is much higher than that of non-templated n-CoCr2 O4 (499 mAh g −1 ). Even at a very high current density of 3000 mA g −1, a specific capacity of 328 mAh g −1 could be obtained. The impact of calcination temperature for 3DOM-CoCr2 O4 composites on electrochemical performance is also explored, and possible electrochemical processes involving CoCr2 O4 during charging and discharging are proposed in this work. During the charge process, oxidation may occur not only from Co 0 to Co 2+, but also partly from Co 2+ to Co 3+ . It is also found that the 3DOM architecture of the CoCr2 O4 compounds can be preserved even after 100 charge and discharge cycles.