Issue 27/2013 - Ceramic functional films significantly improve the safety of lithium batteries

Ceramic functional film significantly improves the safety of lithium batteries

A few days ago, the technology development project of functional separator for high-safety power battery jointly undertaken by Xiamen University and AVIC Lithium Battery (Luoyang) Co.
, Ltd.
and supported by the "863" plan has built an annual output of 3 million square meters of ceramic functional separator test line, on the basis of which the curing, pulping, coating and slitting process technology development has been completed, production capacity has been formed, and the design, trial production and testing
of ceramic separator cells have been carried out.
The implementation of this project plays a crucial role
in improving the safety of lithium-ion power battery production and application.

The project adopts substrate film surface treatment technology and inorganic ceramic powder dispersion technology to optimize the coating effect of ceramic powder, establish the dose-efficiency relationship between coating thickness, ceramic type, particle size, surface characteristics, etc.
and battery performance, summarize the change law of technical parameters of ceramic separator, and develop a separator with both current cutting characteristics and high heat resistance, and the technical indicators have reached the world's advanced level
.

At present, the polyethylene separator with a coating thickness of 3 microns aluminum oxide has a heat shrinkage rate of less than 2% for 2 hours under the condition of 150 °C, which is better than similar foreign products, and the cost can be controlled at 10 yuan / square meter, which has good application prospects
.
After the products developed by the project are put into production, they will be used on a large scale in automotive lithium-ion power batteries and lithium-ion batteries for digital products, thereby greatly improving the safety of
lithium-ion batteries.
(Hu Hong)