Characteristic changes under pulsed pressure action in electrode materials based on LiMn2O4 and Li4Ti5O12 spinels

摘要

Magnetic pulsed compaction (MPC) method has been applied to compact the electrode materials for lithium rechargeable batteries based on LiMn2O4 and Li4Ti5O12 spinels (LMO and LTO). The compressibility and structure evolution of these materials under action of pulsed pressures up to 0.7 GPa have been studied. It was found that pulsed compaction decreases the adhesion strength of electrode coatings with Al foil, however following heat treatment at temperatures up to 220 degrees C leads to partial restoration of adhesion strength. The pulsed pressing of the LMO electrodes does not noticeably influence the electric characteristics of the cells based on them, but cycleability of the LTO electrode cells improves greatly after the compaction treatment. At the same time, the temperature treatment does not essentially influence the operation of both types of cells. (c) 2006 Elsevier B.V. All rights reserved.