USPTO Patent Granted for Cesium Difluorophosphate Battery Material

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 24th, 2026

Detected March 26th, 2026

Summary

The USPTO has granted a patent (US12583748B2) to ZHUHAI SMOOTHWAY ELECTRONIC MATERIALS CO., LTD. for a preparation method of cesium difluorophosphate for aqueous negative electrode slurry, aiming to improve battery performance and stability. The patent details a method involving ion exchange reactions to enhance ion intercalation and form a stable SEI film.

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What changed

The United States Patent and Trademark Office (USPTO) has granted patent US12583748B2 for a novel preparation method of cesium difluorophosphate (CsDFP) intended for use in aqueous negative electrode slurries for secondary batteries. The patent, assigned to ZHUHAI SMOOTHWAY ELECTRONIC MATERIALS CO., LTD., describes a process that utilizes ion exchange reactions to reduce activation energy for ion intercalation, thereby improving battery rate performance. It also highlights the formation of a stable, low-impedance SEI film on the negative electrode plate, which enhances high-temperature storage and cycle performance by inhibiting lithium dendrite growth.

This patent grant represents a new development in battery material science. While it does not impose direct regulatory obligations on companies, it signifies a technological advancement that may influence future product development and intellectual property strategies in the battery manufacturing sector. Companies involved in battery research, development, and manufacturing, particularly those focusing on materials for aqueous electrolytes and improved cycle life, should be aware of this granted patent and its potential implications for their own innovations and competitive landscape.

Source document (simplified)

← USPTO Patent Grants

Preparation method of cesium difluorophosphate for aqueous negative electrode slurry, negative electrode slurry, negative electrode plate, and secondary battery

Grant US12583748B2 Kind: B2 Mar 24, 2026

Assignee

ZHUHAI SMOOTHWAY ELECTRONIC MATERIALS CO., LTD.

Inventors

Chong Mao, Jing Bai, Pipi Wang, Dongyou Pan, Yi An Zeng, Wenliang Dai, Xiaobing Dai

Abstract

A preparation method of CsDFP for aqueous negative electrode slurry includes carrying out ion exchange reactions with LiPO2F2 and a cesium source. The activation energy of Li+ intercalation in the negative electrode is reduced due to the existence of Cs+, leading to a better rate performance. Further, the impedance growth rate of the batteries is reduced and the high temperature storage performance is excellent since PO2F2— participates in the electrochemical reaction to form a stable low-impedance SEI film on the surface of the negative electrode plate. Moreover, films are continuously formed to repair the SEI films under the gradual release of CsDFP, which is conducive to inhibiting the growth of lithium dendrites during long-term high-rate cycling, thereby obtaining an improved cycle performance.