Time domain transients investigation on the lithium rich cathode material Li[Li0.2Ni0.2Mn0.6]O2

• Published in: Physica. B, Condensed matter Vol. 431; pp. 15 - 18
• Main Authors: Xu, Lingxia, Zheng, Weidong, Xu, Xiaoping, Shui, Miao, Cheng, Liangliang, Shu, Jie, Yang, Tianci, Feng, Lin, Ren, Yuanlong
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-12-2013; Elsevier
• Subjects: Cathodes; Cathodic polarization; Chemistry; Circuits; Condensed matter; EIS; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Lithium; Lithium rich cathode material; Mathematical analysis; Time domain; Time transient; Transportation; Time transient; EIS; Lithium rich cathode material; Polarization; Electrochemical properties; Time domain method; Cathode; Equivalent circuit; Lithium oxide; Charge transfer
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2013.08.038

Time domain transients to current step of multiple current densities were calculated to evaluate the polarization and fractional contribution of lithium rich cathode material Li[Li0.2Ni0.2Mn0.6]O2 based on the equivalent circuit determined from the electrochemical impedance spectrum. The calculated data matched the experimental profiles well. The contributions of the individual circuit elements, like charge transfer reaction, lithium transportation across the SEI film and solid-state lithium diffusion process, were successfully differentiated and the importance of each element was fully assessed. The results told us that they should be equally paid attention to and minimized by the optimized preparation method and cell design.