Synthesis parameter dependence of the electrochemical performance of solvothermally synthesized Li4Ti5O12

Qian Yang,Hailei Zhao,Xinmei Hou,Jing Wang,Chunmei Wang,Jie Wang

doi:10.1007/s40243-014-0024-7

Abstract

Pure Li4Ti5O12 with high crystallinity was successfully synthesized by a solvothermal process. The effects of initial Li/Ti ratio and post-heating temperature on the phase evolution, particle morphology and electrochemical properties were systematically investigated. Excess lithium, compared to the theoretical value in Li4Ti5O12, was required to get pure Li4Ti5O12 due to the condensation reaction. Low Li/Ti ratio led to the appearance of secondary phase rutile TiO2, while high heat-treatment temperature easily resulted in particle agglomeration of Li4Ti5O12 powder. The existence of rutile TiO2 decreased the specific capacity, and the particle agglomerate had a strong negative effect on the rate capability of electrode. The sample synthesized at the optimized condition exhibited a stable specific capacity of 150 mAh/g and a good rate performance.

Highlights

Lithium-ion batteries have attracted much attention as important energy supply in portable electronic devices, hybrid electrical vehicles and electrical vehicles because of their high power and energy density [1,2,3]
The results demonstrate that pure Li4Ti5O12 powders with high crystallinity, small crystallite size can be successfully synthesized by solvothermal method
Pure and well-crystallized Li4Ti5O12 powders were synthesized from Ti(O(CH2)3CH3)4 and LiAc by solvothermal route involving a further heat treatment at relatively low temperature with short dwelling time

Summary

Introduction

Lithium-ion batteries have attracted much attention as important energy supply in portable electronic devices, hybrid electrical vehicles and electrical vehicles because of their high power and energy density [1,2,3]. Considering that the practical composition of the synthesized material via solvothermal route is usually different from the nominal composition, in this work, the effect of initial Li/Ti ratio in starting solution on the phase purity and the electrochemical properties was investigated.

Results

Conclusion