The role of phase transformation in the rate performance limited Lix̳ V₂ O₅ battery cathode

[摘要] (cont.) Finally, a non-equilibrium experimental technique, (modified GITT), designed to identify regimes in which phase-boundary motion is rate-limiting, is described. This modification entails the suppression of several assumptions governing the conventional application of the GITT technique to kinetic parameter extraction, namely, the use of ;;small;; current pulses and the violation of the implicit monophasic constraint. It is observed that this variable rate-technique can identify regimes of phase boundary motion control in dimensionally graded Lix̳ V₂ O₅. Further, it is proposed that this technique might allow the microscale phenomenology of rate-limiting phase evolution to be modeled.

[发布机构] Massachusetts Institute of Technology