A novel all-fiber-based LiFePO4/Li4Ti5O12 battery with self-standing nanofiber membrane electrodes.

Li-Li Chen,Shan-Shan Yao,Mao-Xiang Jing,Chong Han,Wei-Yong Yuan,Xiang-Qian Shen,Fei Chen,Xin-Yu Hu,Hua Yang

doi:10.3762/bjnano.10.215

Abstract

Electrodes with high conductivity and flexibility are crucial to the development of flexible lithium-ion batteries. In this study, three-dimensional (3D) LiFePO4 and Li4Ti5O12 fiber membrane materials were prepared through electrospinning and directly used as self-standing electrodes for lithium-ion batteries. The structure and morphology of the fibers, and the electrochemical performance of the electrodes and the full battery were characterized. The results show that the LiFePO4 and Li4Ti5O12 fiber membrane electrodes exhibit good rate and cycle performance. In particular, the all-fiber-based gel-state battery composed of LiFePO4 and Li4Ti5O12 fiber membrane electrodes can be charged/discharged for 800 cycles at 1C with a retention capacity of more than 100 mAh·g−1 and a coulombic efficiency close to 100%. The good electrochemical performance is attributed to the high electronic and ionic conductivity provided by the 3D network structure of the self-standing electrodes. This design and preparation method for all-fiber-based lithium-ion batteries provides a novel strategy for the development of high-performance flexible batteries.

Highlights

With the rapid development of renewable energy technologies, electric vehicles and electronic devices, energy storage technology has become a focus of global research [1,2,3,4,5,6,7]
We describe the preparation of LiFePO4 and Li4Ti5O12 nanofiber membrane materials by a modified electrospinning method
It can be seen that the sintered LiFePO4 nanofiber membrane keeps a stable structure and shows good bending ability

Summary

Introduction

With the rapid development of renewable energy technologies, electric vehicles and electronic devices, energy storage technology has become a focus of global research [1,2,3,4,5,6,7]. By controlling the spinning and sintering process, nanofiber membrane materials can be formed with high porosity and stable structure, especially continuous conductive networks can be formed, which are very suitable for self-standing electrodes [18,21,28]. We describe the preparation of LiFePO4 and Li4Ti5O12 nanofiber membrane materials by a modified electrospinning method.

Results

Conclusion