USPTO Patent Granted for Battery Cell with Ferroelectric Coating

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 24th, 2026

Detected March 26th, 2026

Summary

The USPTO has granted a patent (US12586869B2) for a battery cell separator featuring a ferroelectric coating. This innovation aims to improve battery reliability by slowing dendrite growth and reducing internal short circuits, potentially enhancing coulombic efficiency and rate performance.

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What changed

The United States Patent and Trademark Office (USPTO) has granted patent US12586869B2 for a novel battery cell separator. The separator includes a porous base material coated with a ferroelectric material, specifically a blend of inorganic ferroelectrics and polyvinylidene fluoride (PVDF) with a high β-phase content. This design is intended to mitigate dendrite growth, thereby reducing the risk of internal short circuits and improving overall battery performance, including coulombic efficiency and rate capabilities.

This patent grant signifies a new technological advancement in battery components. While not a regulatory rule, it may influence future industry standards and product development in the energy storage sector. Manufacturers of battery cells and electric devices utilizing such components should be aware of this patented technology, which could impact their product design and intellectual property considerations. The filing date for this patent was August 12, 2025.

Source document (simplified)

← USPTO Patent Grants

Separator, battery cell, battery, and electric device

Grant US12586869B2 Kind: B2 Mar 24, 2026

Assignee

CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventors

Feng Liu, Yulei Fan, Wenhao Guan, Wei Zhong, Xiaoming Ge, Chuying Ouyang

Abstract

A separator, a battery cell, a battery, and an electric device are described. The separator comprises a porous base material and a ferroelectric coating located on at least one surface of the porous base material. The ferroelectric coating comprises a ferroelectric material. The ferroelectric material comprises an inorganic ferroelectric and a ferroelectric polymer. The ferroelectric polymer comprises polyvinylidene fluoride and a copolymer thereof, the ferroelectric polymer comprises β-phase polyvinylidene fluoride, and the content of the β-phase polyvinylidene fluoride in the ferroelectric polymer is greater than or equal to 60%. The separator can slow the continuous growth of dendrites in a direction perpendicular to an electrode sheet, reduce internal short circuits of the battery and improve the reliability of the battery, and can further improve the coulombic efficiency and rate performance of the battery.