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Updated: Jul 11, 2026

Construction and Testing of Coin Cells of Lithium Ion Batteries

Construction and Testing of Coin Cells of Lithium Ion Batteries

Published on: August 2, 2012

Robust Self-Composite Polyimide Separators for Long-Life Lithium-Ion Batteries.

Shilong Bai¹, Ping Gao^1,2

¹Advanced Materials Thrust, Function Hub, The Hong Kong University of Science and Technology (Guangzhou), Nansha District, Guangzhou, 511453, China.

|May 4, 2026

Summary

Engineered polyimide (PI) nanofiber separators using a novel self-composite strategy enhance lithium-ion battery safety and performance. This advanced separator suppresses dendrite growth and improves cycle life for next-generation batteries.

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Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

Electrospun polyimide (PI) nanofiber separators offer thermal stability for lithium-ion batteries.
Current limitations include poor mechanical strength and large pores, hindering dendrite suppression.

Purpose of the Study:

To develop a self-composite polyimide (SCPI) separator to overcome the limitations of traditional PI nanofiber separators.
To improve mechanical integrity, pore uniformity, and dendrite suppression for high-performance lithium-ion batteries.

Main Methods:

A "self-composite" strategy integrating electrospinning with non-solvent-induced phase separation (NIPS).
Fabrication of a hierarchical SCPI separator with an electrospun PI nanofiber scaffold and a NIPS-derived PI matrix.

Main Results:

The SCPI separator demonstrated a 230% increase in tensile strength and reduced average pore size to 200-500 nm.
Achieved dendrite-free lithium plating/stripping at 5 mA/cm² and maintained 98.75% capacity after 800 cycles in Li/LFP pouch cells.

Conclusions:

The SCPI separator effectively homogenizes ion flux, enabling dendrite-free operation and superior battery stability.
This scalable approach provides a pathway for advanced membrane structures in safe, high-performance lithium batteries.