Enhancing the rate and cycling performance of spherical ZnO anode material for advanced zinc-nickel secondary batteries by combined in-situ doping and coating with carbon. (10th May 2017)

• Record Type: Journal Article
• Authors: Li, Jing; Zhao, Tonghui; Shangguan, Enbo; Li, Yao; Li, Linqian; Wang, Dong; Wang, Mingyu; Chang, Zhaorong; Li, Quanmin
• Is Part Of: Electrochimica acta. Volume 236(2017)
• Page Start: 180
• Page End: 189
• Publication Date: 2017-05-10
• Subjects: Anode material -- Zinc oxide -- Carbon doping -- Electrochemical performance -- Nickel-zinc secondary batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.03.164
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: High-performance ZnO microspheres doped and coated with carbon has been successfully fabricated by a facile three-step process using trisodium citrate as doping carbon source and glucose as coating carbon source. Compared with carbon free ZnO precursor, the resulting ZnO-N2 @Cmicrospheresexhibitsuperiorrateperformanceandenhancedcyclingstability.(*) At a rate of 10C (5000 mA g −1 ), the ZnO-N2 @C exhibits specific discharge capacity and volumetric capacities of 283.4 mAh g −1 and 858.7 mAh cm −3, respectively, while the values for the carbon free ZnO precursor are only 140.2 mAh g −1 and 423.4 mAh cm −3 . After cycling 200 times at 500 mA g −1, the obtained ZnO-N2 @C can maintain a satisfying capacity of 508.2 mAh g −1, corresponding to a superior capacity retention (94.7%). In contrast, carbon free ZnO can only deliver the capacity of 109.4 mAh g −1 and a capacity retention of 24.7% after 200 cycles. This outstanding improvement is attributed to the synergistic effect of the combined in-situ doping and coating carbon, including reduced charge-transfer resistance, enhanced electrochemical reversibility, and better anti-corrosion capabilities. As a result, it is believed that ZnO-N2 @C should be an attractive and promising anode material for high power Zinc-Nickel batteries.