Study of lithium ion intercalation/de-intercalation into LiNi1/3Mn1/3Co1/3O2 in aqueous solution using electrochemical impedance spectroscopy

Study of the lithium diffusion properties and high rate performance of TiNb6O17 as an anode in lithium secondary battery

TiNb₆O₁₇ and TiNb₂O₇ were synthesized using a solid-state method. The techniques were used to assess the electrochemical performance and lithium diffusion kinetics of TiNb₆O₁₇ related to the unit cell volume with TiNb₂O₇. The charge-discharge curves and cyclic voltammetry revealed TiNb₆O₁₇ to have a similar redox potential to TiNb₂O₇ as well as a high discharge capacity. The rate performance of TiNb₆O₁₇ was measured using a rate capability test. SSCV and EIS showed that TiNb₆O₁₇ had higher lithium diffusion coefficients during the charging. From GITT, the lithium diffusion coefficients at the phase transition region showed the largest increase from TiNb₂O₇ to TiNb₆O₁₇.