Phase Transition Analysis of LiFePO_4 by Using Time-Resolved X-ray Diffraction and Improvement of Rate Capability: Presented at EVS 31 EVTeC 2018, Kobe, Japan, October 1 - 3, 2018

摘要

Li-ion batteries have been extensively studied, although the corresponding relationship between materials design and input-output characteristics remains poorly understood. Herein, high-power electrode material consisting of dual-substituted LiFePO_4 by zirconium and silicon, Li(Fe_(0.95)Zr_(0.05))(P_(0.9)Si_(0.1))O_4, was investigated as it exhibits small lattice volume change between Li-rich and Li-poor phases. The dual-substituted cathode exhibited 1.5 times faster charge/discharge rates (10C) than that of the undoped material while maintaining its capacity at low rates.