Fabrication of micro lithium-ion battery with 3D anode and 3D cathode by using polymer wall

• Published in: Journal of power sources Vol. 208; pp. 404 - 408
• Main Authors: Yoshima, Kazuomi, Munakata, Hirokazu, Kanamura, Kiyoshi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2012; Elsevier
• Subjects: Anodes; Applied sciences; Capacity; Cathodes; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrodes; Electrolytic cells; Exact sciences and technology; Lithium-ion batteries; Materials; Micro lithium-ion battery; Polymethyl methacrylates; Rate capability; Three dimensional; Three-dimensional electrode; Walls; Three-dimensional electrode; Micro lithium-ion battery; Capacity; Rate capability; Anode; Alkaline storage battery; Methyl methacrylate polymer; Aspect ratio; IV-VI compound; Composite material; Gel electrolyte; Lithium Titanates; Current collection; Cobalt oxide; Cathode; Polymer; Secondary cell; Wall thickness; Lithium battery; Three dimensional model; High power; Silicon oxides; Sol gel process; Lithium oxide; Lithium Manganites
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.02.045

[Display omitted] ► Micro lithium-ion battery with 3D anode and 3D cathode was fabricated. ► The prepared cell showed 270μAhcm−2 as the discharge capacity at 2C rate. ► More than 60% of the discharge capacity at 2C rate was retained at 20C rate. New electrode architecture, in which a polymer wall exists in the gap between interdigitated current collectors on SiO2/Si substrate, was developed for micro lithium-ion batteries with high power and high capacity. The polymer wall with 30μm thickness was very helpful to construct 3D Li4Ti5O12 composite anode and 3D LiCoO2 composite cathode with an aspect ratio of ∼0.5, resulting in a great improvement of cell capacity up to 270μAhcm−2 from 4.8μAhcm−2 of the cell previously prepared by sol–gel process for LiMn2O4 cathode and Li4Ti5O12 anode on a conventional non-wall electrode substrate. Furthermore, in the developed cell configuration with poly(methyl methacrylate) (PMMA) gel electrolyte, more than 60% of the discharge capacity at 2C rate was retained at 20C rate.