Optimization of cycling properties of the layered lithium cobalt nitride Li2.20Co0.40N as negative electrode material for Li-ion batteries. (10th June 2015)

• Record Type: Journal Article
• Authors: Ducros, J.B.; Bach, S.; Pereira-Ramos, J.P.; Willmann, P.
• Is Part Of: Electrochimica acta. Volume 167(2015)
• Page Start: 20
• Page End: 24
• Publication Date: 2015-06-10
• Subjects: lithium cobalt nitrides -- lithium insertion -- lithium vacancies -- negative electrode -- lithium-ion batteries -- cycling behaviour; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.03.099
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: An optimization of the specific capacity exhibited by the best layered lithiated cobalt nitride Li2.20 Co0.40 N is proposed by using a conditioning electrochemical oxidation up to 1.1 V before cycling in the 1.1 V–0.02 V potential range. This initial charge process allows the Co 3+ /Co 2+ redox couple to be involved in the cycling process in addition to the Co 2+ /Co + couple as in the 1 V–0.02 V voltage range. A new electrochemical fingerprint is obtained with a single step at 0.4/0.8 V for the discharge-charge process and a specific capacity of 300 mAh g −1 at C/5 which constitutes a huge improvement compared to 130 mAh g −1 recovered in the conventional 1 V–0.02 V potential window. This high capacity value and the excellent capacity retention of 100% over at least 75 cycles make Li2.20 Co0.40 N a promising anode material for Li-ion batteries.