Effects of Aluminum Doping on Cobalt‐Free Lithium–Iron–Nickel–Manganese–Oxygen Cathode Materials for Lithium‐Ion Batteries. Issue 8 (13th April 2017)

• Record Type: Journal Article
• Authors: Lin, Hongxu; Liang, Chenghao; Li, Mian; Dai, Changsong; Xiong, Yueping
• Is Part Of: Energy technology. Volume 5:Issue 8(2017:Aug.)
• Page Start: 1472
• Page End: 1483
• Publication Date: 2017-04-13
• Subjects: aluminum -- doping -- electrochemistry -- lithium-ion batteries -- sol–gel processes; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201600757
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: To decrease the cost of lithium‐ion cathode materials, cobalt‐free Li‐Fe‐Ni‐Mn‐O (FeAl000) was synthesized by a facile sol–gel method by using citric acid as the chelating agent. To enhance the electrochemical performance of FeAl000, low‐costing and environmentally friendly aluminum was added as a dopant. The Al‐doped Li‐Fe‐Al‐Ni‐Mn‐O (FeAl015) material exhibited excellent electrochemical performance. The charge/discharge capacity and corresponding differential capacity curves suggested that Al‐doping activated the transformation of Mn 4+ into Mn 3+, and the activated Mn 3+ /Mn 4+ redox/oxide couple contributed to an increase in the discharge capacity. X‐ray photoelectron spectroscopy analyses demonstrated the transformation of Mn 4+ into Mn 3+/2+ . The Nyquist and Bode curves obtained by electrochemical impedance spectroscopy indicated that Al doping enhanced electron transfer and somewhat hampered formation of the solid–electrolyte‐interphase layer during cycling. Abstract : [Al]l in : A cobalt‐free Li‐Fe‐Ni‐Mn‐O cathode material for lithium‐ion batteries is synthesized through a facile sol–gel method. Aluminum doping is found to enhance the structural stability and electrochemical performance of this material. Nyquist and Bode curves are used to study the effect of Al doping on the Li‐Fe‐Ni‐Mn‐O material.