Improvement of cycle performance of lithium ion cell LiMn2O4/LixV2O5 with aqueous solution electrolyte by polypyrrole coating on anode

• Published in: Electrochimica acta Vol. 52; no. 15; pp. 5102 - 5107
• Main Authors: Wang, Haibo, Zeng, Yuqun, Huang, Kelong, Liu, Suqin, Chen, Liquan
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 01.04.2007
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Ternary compound; Anode; Surface coating; Atomic emission spectrometry; Aqueous solution electrolyte; Electrode material; Coatings; Inductive coupling plasma spectrometry; Lithium ion battery; Capacity; Vanadium oxide; Polypyrrole; Electrical characteristic; Modified material; Cycling; Coating material; Electrolyte solution; Secondary cell; X ray diffraction; Cycle performance; Conducting polymers; Manganese oxides; Lithion ion batteries; Lithium oxide; Aqueous solution; Performance; Pyrrole polymer
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2007.02.004

The reasons of capacity fading during cycling process of LiMn2O4/LixV2O5 lithium ion cell with 5M LiNO3 aqueous solution as electrolyte were investigated. XRD and ICP results showed that the properties of the anode have more impact on the cycle life of the cell. In an attempt to improve the cycle performance of the as-assembled cell, coating with an ionic conductive polypyrrole (PPy) on the surface of the anode was proposed via in situ polymerization method. Cycling tests revealed that the stability of the lithium ion cell with surface coated anode has been greatly improved. Moreover, the capability of the cell with coated anode was also enhanced compared with the cell with bare anode.