Abstract
Lithium-ion batteries offer promising opportunities for novel energy storage systems and future application in hybrid electric vehicles or electric vehicles. Cathode materials with high energy density are required for practical application. Herein, high-voltage LiCoPO4 cathode materials with different shapes and well-developed facets such as nanorods and nanoplates with exposed {010} facets have been synthesized by a one-pot supercritical fluid (SCF) processing. The effect of different amines and their roles on the morphology-control has been investigated in detail. It was found that amine having long alkyl chain such as hexamethylenediamine played important roles to manipulate the shape of the nanocrystals by selective adsorption on the specific {010} facets. More importantly, the nanorods and nanoplates showed better electrochemical performance than that of nanoparticles which was attributed to their unique crystallographic orientation with short Li ion diffusion path. The present study emphasizes the importance of crystallographic orientation in improving the electrochemical performance of the high voltage LiCoPO4 cathode materials for Li-ion batteries.
Highlights
Lithium-ion batteries offer promising opportunities for novel energy storage systems and future application in hybrid electric vehicles or electric vehicles
High-voltage LiCoPO4 cathode materials with different shapes and well-developed facets such as nanorods and nanoplates with exposed {010} facets have been synthesized by a one-pot supercritical fluid (SCF) processing
Organic molecules and nuclei can be homogeneously miscible at supercritical fluid conditions, leading facile surface functionalization of the synthesized nanocrystals
Summary
Lithium-ion batteries offer promising opportunities for novel energy storage systems and future application in hybrid electric vehicles or electric vehicles. The present study emphasizes the importance of crystallographic orientation in improving the electrochemical performance of the high voltage LiCoPO4 cathode materials for Li-ion batteries. Attempts to use solution methods for controlled synthesis of LiCoPO4 have received a limited success[24,25,26,27,28,29] and the effect of crystallographic orientation and particle morphology on the electrochemical performance has not been reported. We presented three examples of LiCoPO4 nanocrystals including nanoparticles, nanorods, nanoplates and investigated the effect of crystal shapes on the electrochemical performance of the cathode material. A maximum initial discharge capacity of 130 mAhg[21] at C/10 rate (77.8% theoretical capacity) was obtained for nanorod particles, while nanoplates showed higher rate capacity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
