Binder-Free Electrode based on Electrospun-Fiber for Li Ion Batteries via a Simple Rolling Formation

Yuqiong Kang,Tao Li,Changjian Deng,Quan Hu,Yun Zhao,Zheng Liang,Xinyi Liu

doi:10.1186/s11671-020-03369-y

Yuqiong Kang, Tao Li + Show 5 more

Open Access

https://doi.org/10.1186/s11671-020-03369-y

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Abstract

With the demand for higher energy density and smaller size lithium-ion batteries (LIBs), the development of high specific capacity active materials and the reduction of the usage of inactive materials are the main directions. Herein, a universal method is developed for binder-free electrodes for excellent stable LIBs by rolling the electrospun membrane directly onto the commercial current collector. The rolling process only makes the fiber web denser without changing the fiber structure, and the fiber web still maintains a porous structure. This strategy significantly improves the structural stability of the membrane compared to the direct carbonized electrospun membrane. Moreover, this method is suitable for a variety of polymerizable adhesive polymers, and each polymer can be composited with different polymers, inorganic salts, etc. The electrode prepared by this method can be stably cycled for more than 2000 cycles at a current density of 2500 mA g−1. This study provides a cost-effective and versatile strategy to design the LIB electrode with high energy density and stability for experimental research and practical application.

Highlights

Lithium-ion batteries (LIBs) are widely applied in portable devices, electric vehicles, and stationary energy storage systems [1, 2]
Binder-free electrodes can be fabricated by electrospinning technique with a simple, versatile, and cost-effective way [8], the as-prepared membranes often become brittle after carbonization [9]; the electrodes have to be prepared by mixing and grinding the carbonized materials with polyvinylidene fluoride (PVDF) in organic solution, which is time
A universal rolling press method is developed for binder-free electrodes for stable LIBs by rolling the electrospun membrane directly onto the commercial current collector

Summary

Introduction

Lithium-ion batteries (LIBs) are widely applied in portable devices, electric vehicles, and stationary energy storage systems [1, 2]. The reduction of the amount of inactive materials in the electrode is an effective method to improve energy density. It is extremely important to design the stable electrospun membrane for advanced binder-free electrodes.

Results

Conclusion