Electrochemical performances of graphite and LiNi_(0.6)Co_(0.2)Mn_(0.2)O_2 cells at low temperature

摘要

I. In all the three types of battery assemblies (half coin cell, full coin cell, and full pouch cell), low loaded, thin and low-density electrodes showed a better electrochemical performance. II. An increase in internal resistance of the electrode was observed with increase of electrode thickness at low temperature which is confirmed from EIS and GITT data. III. The deterioration of charge/discharge capacity at low temperature of thicker electrode was mainly due to Li ion diffusion within the electrode and a higher charge-transfer resistance on the surface of electrode. IV. A proper optimization of electrode thickness or active material loading is required to design an efficient lithium ion battery for low temperature environment.